JPH11248859A - Light-emitting display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excite a display panel quickly, obtain a high luminous brightness by exposing to external air only for several minutes, and drastically extend afterglow time by providing a luminous layer where a high luminous material is blended on the surface of a substrate, on the reverse side of a light transmission substrate, or the like. SOLUTION: A luminous layer 2 forms a time character 2a, a mark 2b, and the like and is formed by applying the time character, the mark, and the like consisting of a high luminous material or by printing using ink containing the high-luminous material. This sort of ink containing the high luminous material is obtained by dissolving a solid acryl resin with a solvent and blending the high luminous material to it, where a binder such as the acryl resin and the high luminous material are blended by a ratio of 1 to 0.4-0.9 in terms of a capacity ratio. The high luminous material emits a light yellow green color. The luminous layer 2 can be directly formed on the substrate surface without any plating by a metal substrate 1 or an aluminum substrate with a high light reflection factor. Also, by providing a luminous reflection layer. with a high reflection factor such as white paint on the reverse side of the luminous layer 2, luminous brightness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel used for a timepiece, a meter, a guide panel, and the like, and more particularly to a light emitting display panel which emits light partially or entirely by using a light emitting material. It is. The present invention also relates to a solar clock dial for a watch in which the basic configuration of the light emitting display panel corresponds to a clock using a solar cell as a power supply, or a liquid crystal display panel having a basic configuration of the light emitting display panel as a backlight. The present invention also relates to a light emitting sheet that can be adhered to the display panel or the like.

[0002]

2. Description of the Related Art Conventionally, as a technique for displaying a timepiece dial by using a phosphorescent light emitting material, Japanese Patent Laid-Open Publication No.
There is one disclosed in Japanese Patent No. 5958. This timepiece dial is formed by applying a white paint on the entire upper surface of the substrate, forming a layer of a luminous paint having a luminous base of aluminum strontium oxide thereon, and further forming a mark or mark on the surface of the luminescent paint layer. A time scale and the like were formed.
Luminescent luminous paint used for this watch dial,
This is a paint obtained by mixing a luminescent agent having aluminum strontium oxide as a luminescent substrate with a thermosetting binder. In such a paint, the luminance was high and the afterglow time of about 8 hours was obtained.

There is also a display device with luminous paint disclosed in Japanese Patent Application Laid-Open No. 7-287541. In this display device, a base coat serving as a light reflection layer is placed on a dial base, and a base coat is placed thereon. Luminescent luminous paint is screen-printed, and a translucent film is further placed thereon, and a printing ink portion for displaying a brand name, a time character, and the like is formed on the film. Luminescent luminous paint in this display device,
It is the same as that of the conventional timepiece dial described above, and has almost the same light emission performance.

[0004]

The luminous paints of the prior art described above require a time period of up to several tens minutes (8 hours) to reach saturation excitation.
It takes a long time (approximately 20 minutes under 00 lux), and a sufficient initial luminance cannot be obtained unless the device is left in a bright place for a long time.

[0005] Although the brightness is high and the afterglow time is long, a film thickness of about 100 µm or more is required to secure sufficient brightness for use in a timepiece dial or the like. . In order to increase the thickness of the coating film, it is necessary to print the light emitting layer at least two to three times to form a layer that emits light, thereby increasing the number of steps and increasing the cost.

The present invention employs a high-luminous material having high-speed excitation, high luminance, and low attenuation, and employs a structure for increasing luminance. Long luminous display board, solar clock for clock,
A liquid crystal display panel and a light emitting sheet are provided.

[0007]

According to the present invention, there is provided a light-emitting display panel having a general formula (SrEu) Al ₂ O _4. [(SrEu)
On · n (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)] wherein Q is
Bi, Ca, Mg, at least one selected from Mn, a is 0.0005 ≦ a ≦ 0.002,
b is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n
≦ 7] and a light emitting layer containing a high light emitting material made of a fired body is formed on the entire surface or a part of the substrate.

The light-emitting display panel of the present invention according to claim 2 has the general formula (SrEu) Al ₂ O _4. [(SrEu) O.n (Al
_1-ab B _b Q _a ) ₂ O ₃ (OH)] [wherein Q is Bi, C
a, Mg, at least one selected from Mn,
a is 0.0005 ≦ a ≦ 0.002, and b is
0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦ 7]. A light-emitting layer containing a high light-emitting material formed of a fired body is formed on the rear surface of the light-transmitting substrate. It is formed on the entire surface or a part thereof and provided with a light reflection layer.

According to a third aspect of the present invention, there is provided a light emitting display panel, wherein a light diffusion layer is formed between the light emitting layer and the reflective layer.

The light emitting layer of the light emitting display panel according to the present invention is formed in a dot shape or a grid shape.

According to a fifth aspect of the present invention, there is provided a timepiece solar dial according to the first aspect, wherein the substrate is formed of a light-transmitting substrate.

According to a sixth aspect of the present invention, there is provided a solar clock dial for a timepiece, wherein a light diffusion layer is formed between the light emitting layer and the substrate.

In the solar clock for a timepiece according to the present invention, the light emitting layer is formed in a dot shape or a grid shape.

The liquid crystal display panel according to the present invention comprises a first transparent glass substrate having an upper polarizing plate formed on the front surface and a second transparent glass substrate having a lower polarizing plate formed on the back surface. Oppositely disposed, a segment electrode and a common electrode are formed on opposing inner surfaces of the first and second transparent glass substrates, and an alignment film for aligning liquid crystal molecules is formed on the segment electrode and the common electrode. While maintaining the gap, a liquid crystal substrate in which liquid crystal is sealed between the first and second transparent glass substrates with a sealing member, and a general formula (SrEu) Al ₂ O _4.
rEu) Onn (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)]
Is at least one selected from Bi, Ca, Mg, and Mn, a is 0.0005 ≦ a ≦ 0.002, b is 0.001 ≦ b ≦ 0.35, and n is Is 1
≦ n ≦ 7], and a backlight comprising a light emitting layer in which a high light emitting material made of a fired body is blended.

According to a ninth aspect of the present invention, there is provided the liquid crystal display panel of the present invention, wherein a reflective layer is provided on the back side of the light emitting layer.

According to a tenth aspect of the present invention, there is provided a liquid crystal display panel comprising a light diffusion layer provided between the light emitting layer and the reflective layer.

In the liquid crystal display panel according to the present invention, the light emitting layer is formed in a dot shape or a grid shape.

The luminescent sheet of the present invention according to claim 12 has the general formula (SrEu) Al ₂ O _4. [(SrEu) Onn (Al
_1-ab B _b Q _a ) ₂ O ₃ (OH)] [wherein Q is Bi, C
a, Mg, at least one selected from Mn,
a is 0.0005 ≦ a ≦ 0.002, and b is
0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦ 7] provided between the overcoat layer and the adhesive layer. It is.

The luminescent sheet according to the present invention described in claim 13 has the general formula (SrEu) Al ₂ O _4. [(SrEu) Onn (Al
_1-ab B _b Q _a ) ₂ O ₃ (OH)] [wherein Q is Bi, C
a, Mg, at least one selected from Mn,
a is 0.0005 ≦ a ≦ 0.002, and b is
0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦ 7]. A light-emitting layer containing a high light-emitting material formed of a fired body is used as a light-transmitting overcoat layer and an adhesive layer. And the entire surface or a part of the surface of the reflection layer provided between them.

The luminescent sheet of the present invention according to claim 14 has the general formula (SrEu) Al ₂ O _4. [(SrEu) Onn (Al
_1-ab B _b Q _a ) ₂ O ₃ (OH)] [wherein Q is Bi, C
a, Mg, at least one selected from Mn,
a is 0.0005 ≦ a ≦ 0.002, and b is
0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦ 7], a light-emitting layer containing a high light-emitting material formed of a fired body, and an overcoat layer and a light-transmitting adhesive layer. Are provided on the whole or a part of the back surface of the reflection layer provided between them.

According to a fifteenth aspect of the present invention, a light diffusion layer is formed between the light emitting layer and the reflective layer.

The light emitting layer in the light emitting sheet of the present invention described in claim 16 is formed in a dot shape or a grid shape.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The light emitting display panel according to the first aspect of the present invention is obtained by forming a light emitting layer containing a high light emitting material having high speed excitation, high luminance and low attenuation on a substrate. . The light-emitting layer in which this high light-emitting material is blended has high-speed excitation, high luminance, and low attenuation, and therefore, even if the thickness is thinner than that formed using a conventional phosphorescent light-emitting paint, it is sufficient. Brightness can be obtained. Therefore, the number of printings for forming the light emitting layer can be reduced by the thinner the light emitting layer.

According to a second aspect of the present invention, in the light emitting display panel, a light emitting layer made of a high light emitting material is provided on the back side of the light transmitting substrate, and a reflective layer is further provided to increase the brightness. It has become. By illuminating from the rear surface side of the light-transmitting substrate in this way, illumination with a three-dimensional effect can be provided, and the degree of freedom of arrangement of time characters and the like provided on the substrate front surface side can be increased, and the appearance can be improved. it can.

In the above light emitting display panel, a light diffusion layer is provided between the light emitting layer and the reflection layer, and the light radiated to the back side of the light emitting layer is diffused by the diffusion layer. And
Further, the light is reflected in the surface direction by the reflection layer, so that the light emitted in the surface direction is increased and the luminance can be increased.

In the light-emitting display panel, since the light-emitting layer is formed in a dot shape or a lattice shape, the surface of each dot or rectangular portion is raised and rounded. It becomes a curved surface. Therefore, the light emitting surface area can be increased as compared with the case where the light emitting layer is formed flat, and the luminance can be increased.

On the other hand, in the light-emitting display panel,
As described in (1), when the substrate is made of a material having a light-transmitting property, external light incident from the front side is transmitted to the back side. This makes it possible to use it as a solar dial placed on the front side of the solar cell. In this case, as described in claim 6, by further providing a diffusion layer between the light emitting layer and the substrate, it is possible to diffuse external light and irradiate the solar cell in a uniform state. Power generation efficiency can be improved. Also in this solar dial, as described in claim 7, it is possible to increase the brightness by forming the light emitting layer in a dot shape or the like.

In the liquid crystal display panel according to the present invention, a backlight made of a light emitting layer containing a high light emitting material is provided on the back side of the liquid crystal substrate. Since the light emitting layer has high luminance, the liquid crystal substrate is illuminated from the back side thereof, and the light emitting layer is formed on the back surface of the liquid crystal substrate by printing, so that the thinning of the liquid crystal display panel is not hindered. . Further, by providing a reflective layer on the back surface side of the light emitting layer, it is possible to further increase the luminance. Further, as described in claim 10, by providing a diffusion layer between the reflection layer and the light-emitting layer, light emitted from the light-emitting layer to the back side is also diffused and reflected in the surface direction, and efficiently, It is possible to uniformly illuminate the liquid crystal substrate. Also in this liquid crystal display panel, it is possible to increase the luminance by forming the light emitting layer in a dot shape or the like as described in claim 11.

On the other hand, the luminescent sheet according to the twelfth aspect of the present invention comprises a luminescent layer containing a high luminescent material having high-speed excitation, high luminance and low attenuation, provided between the overcoat layer and the adhesive layer. Things. The overcoat layer is provided to seal the light emitting layer to prevent deterioration due to moisture, and the adhesive layer is provided so as to be easily adhered to an adherend. Further, the light-emitting layer containing a high light-emitting material has high-speed excitation, high luminance, and low attenuation, like the light-emitting display panel described above, and thus was formed using a conventional phosphorescent light-emitting paint. Even if the thickness is thinner, sufficient brightness can be obtained,
As described above, the number of printings for forming the light emitting layer can be reduced by the thin thickness of the light emitting layer.

The luminescent sheet according to the thirteenth aspect of the present invention is provided with a reflecting layer for reflecting light in the direction of the overcoat layer between the translucent overcoat layer and the adhesive layer, The entire surface or a part of the surface of the reflective layer facing the overcoat layer is provided with a light emitting layer in which the above-described high light emitting material is blended. In this light emitting sheet, the light from the light emitting layer, the external light reflected by the surface of the reflective layer, and the light from the light emitting layer are all radiated through the overcoat layer, so that the luminance can be increased.

Further, in the luminescent sheet according to claim 14 of the present invention, a reflective layer for reflecting light in the direction of the adhesive layer is provided between the overcoat layer and the translucent adhesive layer,
Further, a light-emitting layer in which the above-mentioned high light-emitting material is blended is provided on the whole or a part of the back surface of the reflective layer facing the adhesive layer. Also in this light emitting sheet, since the light from the light emitting layer, the external light reflected by the surface of the reflective layer, and the light from the light emitting layer are all radiated in the adhesive direction via the adhesive layer, the brightness can be increased.

Also, in the above light emitting sheet, a light diffusion layer is provided between the light emitting layer and the reflection layer, and the light emitted from the light emitting layer is diffused by the diffusion layer. Further, by reflecting the light on the reflection layer, the emitted light is increased and the luminance is increased.

Also in the light emitting sheet, since the light emitting layer is formed in a dot shape or a lattice shape, the surface of each dot or rectangular portion is raised to give a rounded convex shape. Surface. Therefore, the light emitting surface area can be increased as compared with the case where the light emitting layer is formed flat, and the luminance can be increased.

[0034]

FIG. 1 is a sectional view showing the structure of a light emitting display panel according to a first embodiment of the present invention. In the present embodiment and other embodiments described later, the luminescent display plate is described by taking the timepiece dial as an example, but the present invention is not limited to the timepiece dial.

The light emitting display panel in this embodiment has a metal substrate 1 on which a foot 1a is attached to the back surface and a perforated pattern is formed on the surface and plated, and a light emitting display plate formed on the surface of the substrate 1. And a clear layer 13 formed by applying a clear coating on the surface of the substrate 1 so as to cover the light emitting layer 2.

The light emitting layer 2 in the present embodiment has a time character 2a,
The mark 2b and the like are formed, and are formed by sticking a time character, a mark or the like made of a high light emitting material, or printing with ink containing the high light emitting material.

The raw material of the high light emitting material in this embodiment is as follows.
Each is a compound selected from strontium compounds, α-type Al ₂ O ₃ , γ-type Al ₂ O ₃ , boron compounds, europium compounds and at least one of bismuth compounds, magnesium compounds and manganese compounds. And
This raw material is pulverized, and at least one of the raw materials is acid-treated, all the raw materials are mixed, and the mixture is slowly heated from 400 ° C. to 1600 ° C. over 7 hours to 10 hours in the presence of a carbonaceous material. And then from 1250 ° C to 1600 ° C for 5
It is obtained by firing for 3 hours to 3 hours, then cooling to 200 ° C. for 7 hours to 10 hours, pulverizing and classifying. The high luminescent material obtained through such a manufacturing process is represented by the general formula (SrEu) Al ₂ O _4.
[(SrEu) O · n (Al 1-ab B b Q a) 2 O 3
(OH)] wherein Q is at least one selected from Bi, Ca, Mg and Mn, and a is 0.0005
≦ a ≦ 0.002, and b is 0.001 ≦ b ≦ 0.
35, and n is 1 ≦ n ≦ 7].

Usually, this high luminescent material is in the form of a powder and is used by being molded by mixing it with a synthetic resin or the like. For example, an ink can be formed by dispersing and blending a powdery high light emitting material into a binder of a transparent thermosetting resin, and the ink can be formed into a desired shape by screen printing using the ink. The light emitting layer 2 shown in FIG. 1 is formed in the shape of a time character or a mark by screen printing on the surface of the substrate 1 with the ink containing the high light emitting material as described above. Note that the light emitting layer 2 in the present embodiment has a time character 2a.
Although the shape of the mark 2b is set, it can be printed on the entire surface of the substrate 1 or a part of the surface, and the shape and arrangement thereof can be arbitrarily changed.

The ink containing such a high light-emitting material is obtained by dissolving a solid acrylic resin with a solvent and mixing the high light-emitting material into the ink. The high light emitting material is compounded at a ratio of 0.4 to 0.9 with respect to 1. In this compounding ratio, when the content of the high luminescent material is more than 0.9, the resin content becomes too small, the thixotropy is increased, and blurring or peeling of printing occurs. On the other hand, if the amount of the high light emitting material is less than 0.3, the amount of the resin becomes too large, and bleeding occurs in printing. Therefore, it is optimal to mix the high light emitting material within the above range of the mixing ratio.

Further, since the high light emitting material in this embodiment emits light yellow green light, the ink obtained by dispersing and blending this high light emitting material in a transparent resin also emits light yellow green light. Therefore, when it is desired to change the emission color of the light emitting layer 2,
By adding a pigment of a desired color to the ink, it becomes possible to emit light of a desired color.

On the other hand, in the present embodiment, the metal substrate 1 is used. However, by using a substrate made of aluminum or the like having a high light reflectance, the surface of the substrate can be formed without plating. The light emitting layer 2 can be formed directly on the substrate. When a metal substrate having low reflectance or a plastic substrate that transmits light is used, a light reflection layer made of a material having high reflectance such as white paint is provided on the back side of the light emitting layer 2. Thereby, the light emission luminance can be increased.

The clear layer 13 is provided for the purpose of increasing the gloss of the surface of the substrate 1 and the like to give the three-dimensional appearance of the light emitting layer 2 and for protecting the display panel surface.

An ink containing a high luminous material in a luminous display panel having the above-mentioned structure and a general formula m (Sr ₁ -XE) having excellent afterglow as a conventional luminous material
u _X ) OnAl ₂ O ₃ .yB ₂ O ₃ [where 1 ≦ m ≦
5, 1 ≦ n ≦ 8, 0.001 ≦ y ≦ 0.35], and the afterglow luminance of an ink containing the same compounding ratio as that of the above-mentioned high luminescent material under the same conditions. Table 1 shows a comparison. In addition, both the volume ratios of the ink containing the high light emitting material and the conventional light emitting material shown in Table 1 are those in which the binder is 1 and the high light emitting material is mixed at a ratio of 0.7.

[0044]

[Table 1]

The values of the afterglow luminance shown in Table 1 were obtained by forming a light emitting layer having a thickness of 100 μm with ink using the above-mentioned conventional light emitting material and the high light emitting material in the present embodiment, respectively, for 24 hours. This is a value obtained by irradiating with light for about 30 minutes at an illuminance of about 1000 lux for excitation for 30 minutes and measuring the afterglow luminance. As shown in Table 1, the luminance of the high light emitting material is about twice that of the conventional light emitting material at the same time. Therefore, when the same luminance as that of the conventional light emitting material is obtained by using the high light emitting material, the high light emitting material is about 1
With a layer thickness of about 2 (about 50 μm), almost the same luminance as that of a conventional light-emitting material of 100 μm can be secured. Therefore, by using an ink containing a highly luminescent material,
The luminance of the light emitting layer 2 is increased, the thickness can be reduced to about half of the conventional light emitting layer, and the light emitting layer formed by printing several times conventionally can be formed by one or two times printing. become able to. Furthermore, since the excitation time required to reach a certain luminance is generally shorter as the afterglow luminance is higher, the high light emitting material reaches a predetermined luminance earlier than the conventional light emitting material, and the excitation time is reduced. It is also possible.

FIG. 2 is a half sectional view showing a light emitting display panel according to a second embodiment of the present invention. Note that the same reference numerals are given to portions formed of the same operation and the same material as those in the first embodiment described above. The light emitting display panel in the present embodiment,
A reflective layer 4 is formed on the surface of a metal substrate 1 having a foot 1a, a light-emitting layer 2 containing the above-described high light-emitting material is formed on the surface of the reflective layer 4, and a time character is further formed on the surface. A light-transmitting substrate 5 made of plastic or the like having a light-transmitting property on which a light-transmitting substrate 6 and the like are formed is provided. As described above, the light emitting display panel according to the present embodiment is configured such that the light emitting layer 2 is provided on the back surface side of the light transmitting substrate 5 so as to illuminate from the back side of the light transmitting substrate 5.

The light emitting layer 2 in this embodiment is formed by printing with the same ink containing a high light emitting material as in the first embodiment described above. Also, the same one as in the first embodiment is used. The light-emitting layer 2 has a low luminance when the layer thickness is thin, and increases in luminance as the layer becomes thicker. The luminance increases proportionally up to about 100 μm.
When it exceeds μm, the increase in luminance becomes slow, and when it exceeds 150 μm, the luminance hardly increases and becomes constant. For this reason, in this embodiment, the layer thickness of the light emitting layer 2 is set to 100 μm. However, as shown in Table 1 described above, about twice the luminance is obtained as compared with the conventional light emitting material having the same thickness. be able to.

On the other hand, in the present embodiment, the reflective layer 4 is formed by printing a white paint, but in addition, silver, aluminum powder or the like having a high reflectivity may be mixed with the paint for printing. Can also be formed. The reflection layer 4 can also be formed by forming a metal thin film on the surface of the substrate 1 by vapor deposition or attaching a metal foil. The reflection layer 4 formed in this manner is a light emitting layer 2
Works to effectively reflect the light radiated toward the surface to increase the luminance.

The light-transmitting substrate 5 in this embodiment is made of plastic or the like, but is not limited to this, and has a light-transmitting property such as glass, ceramic, or sapphire. Any material that can be molded may be used. Furthermore, this light-transmitting substrate 5
It is possible to use even a material which is decorated with coloring or the like to such an extent that light transmission is not hindered.

In the light emitting display panel having the above structure, the luminance can be increased by the light emitting layer 2 using the high light emitting material, as in the first embodiment. The thickness of the layer 2 can be reduced to reduce the number of printing steps.

FIG. 3 is a sectional view showing a light emitting display panel according to a third embodiment of the present invention, FIG. 4 is an enlarged view of a main part thereof, and FIG. 5 is an enlarged plan view thereof. In the third embodiment, the same components and functions as those in the first and second embodiments are denoted by the same reference numerals. The light emitting display panel according to the present embodiment includes a metal substrate 1 having a foot 1a, a reflective layer 4 formed on the surface thereof, a diffusion layer 9 formed on the surface, and a light emitting layer 9 formed on the surface. And a light-transmitting substrate 5 having a time character 6 fixed on its surface and adhesively fixed on the light-emitting layer 2 via a transparent adhesive.

The diffusion layer 9 in this embodiment is formed by mixing and printing a microsphere 10 such as a transparent and glossy glass bead with a transparent acrylic resin paint. The microspheres 10 have a particle size of 2 to 30 μm so as to make the diffusion of light uniform and to prevent unevenness in luminance.
It is preferable to use those having a particle size in the range of m and a large number of particles having particle sizes different from each other. By providing the diffusion layer 9, the light emitted from the light emitting layer 2 to the back surface side is diffused by the minute spherical body 10, and together with the light reflected by the reflective layer 4, the light is emitted from the gaps between the dots of the light emitting layer 2, which will be described later. Irradiation in the direction increases the brightness. The structure of the diffusion layer 9 is not limited to the above structure, but may be formed by laying a large number of the microspheres 10 on the reflection layer 4 or may be formed on a thin transparent resin film. May be formed. In addition, the microspheres 10 are not limited to glass beads.
Any material may be used as long as it is a plastic ball, a silica ball, or any other member that irregularly reflects light.

On the other hand, the light emitting layer 2 in this embodiment is different from the light emitting layer shown in FIG.
As shown in the figure, the dot is printed and formed on the surface of the diffusion layer 9. The planar shape of the dots of the light emitting layer 2 is a minute circle as shown in FIG. 5, and a large number of dots are arranged at regular intervals. The light emitting layer 2 formed in a dot shape in this manner has a convex curved surface with a raised surface due to the surface tension of the ink. For this reason, its surface area increases compared to a flat surface,
By making the dot interval as small as possible, the light emitting area can be greatly increased as compared with the solid printed layer in each of the above-described embodiments. Further, the shape of the dots of the light emitting layer 2 in the present embodiment is such that the planar shape is circular, but this is set to a rectangular shape as shown in FIG. Doing so has the same effect.

In this embodiment, since the light emitting layer 2 is formed of an aggregate of dots and further provided with the diffusion layer 9 and the reflection layer 4, not only the light emitted from the light emitting layer 2 toward the surface thereof, The light emitted from the light emitting layer 2 in the direction of the back surface thereof is also diffused by the diffusion layer 9.
The microspheres 10 and the reflective layer 4 are used to irradiate the surface of the light emitting layer 2 from the gaps between the dots. Therefore, in the light emitting display panel having this structure, the luminance becomes about three times as long as that of the first and second embodiments in which the light emitting layer is formed by solid printing, and the afterglow time is extended. As a result, it is not necessary to form the light emitting layer thick to increase the luminance,
Sufficient light emission can be obtained with a thin light-emitting layer. Conventionally, two or three printings were required to form a thick light-emitting layer. Can be achieved.

As shown in FIGS. 7 and 8, the light emitting layer 2 in the first and second embodiments can also be formed in a dot shape. The surface area of the dot-shaped light emitting layer 2 can be increased by swelling.

FIGS. 9 to 11 show fourth to sixth embodiments in which the light emitting display panel in the first to third embodiments is changed to a solar clock dial for use in a portable timepiece equipped with a solar cell powered by a solar cell. It is sectional drawing which shows an Example, FIG. 12: is sectional drawing which shows the structure of a portable timepiece with a solar cell. In the fourth to sixth embodiments, the first to third embodiments described above are also used.
The same reference numerals are given to the same components and operational parts as in the embodiment. As shown in FIG. 12, in a solar-equipped mobile watch, a movement 14
Are fixed via a middle frame 19, a solar cell 15 is fixed above the movement 14, and a solar dial 16 is further fixed on the middle frame 19 via a support frame 18. In this timepiece, external light is radiated to the solar cell 15 via a cover glass 17 on the front of the timepiece and a solar dial 16 below the solar clock, so that the solar dial 16 has translucency. It is necessary. For this reason, as shown in FIGS. 9 to 11, the light-emitting display panel substrate 1 in the above-described first to third embodiments is replaced with a light-transmitting sheet 1 made of a transparent film sheet.
1 and the reflective layer 4 in the second and third embodiments is removed so that external light emitted from the front side is transmitted toward the back side.

Even in the case of the fourth to sixth embodiments in which the light-emitting display panel is changed so as to transmit light, since the light-emitting layer 2 has a light yellow-green color, which is the material color of the light-emitting layer, the light-emitting layer 2 is not changed. The solar dial used does not become colorless. However, even in this case, the light transmittance is 50% or more, and a sufficient transmittance for power generation of the solar cell 15 can be obtained.
In particular, when the diffusion layer 9 is provided, external light is diffused by the diffusion layer 9 and is radiated to the solar cell 15 as wide and uniform light, so that the power generation efficiency of the solar cell 15 is improved. be able to.

Although this solar dial is constructed so that it can be handled independently as a dial, it can also be provided integrally on the surface of the solar cell 15. That is, the light emitting layer 2 is directly provided on the surface of the solar cell 15.
Alternatively, a light-transmitting substrate 5 or the like may be stacked.

The light-transmitting sheet 11 is preferably formed of a sheet having excellent moisture resistance and heat resistance, such as a polyester film.

The light emitting layer 2 in the above-mentioned solar dial can also be printed and formed in a dot shape or a grid shape.

FIGS. 13 to 15 are sectional views showing seventh to ninth embodiments of a liquid crystal display panel using a backlight having the same basic structure as the light emitting display panels in the first to third embodiments. . In the seventh to ninth embodiments, the same components and functions as those in the first to third embodiments are denoted by the same reference numerals. First, the structure of the liquid crystal substrate 20 used in the liquid crystal display panel will be described. This liquid crystal substrate 20 is shown in FIGS.
As shown in FIG. 2, a transparent glass substrate 22 having an upper polarizing plate 21 formed on the front surface and a transparent glass substrate 24 having a lower polarizing plate 23 formed on the back surface are arranged opposite to each other.
A transparent segment electrode 25 and a common electrode 26 are formed on the inner surfaces facing each other, and transparent alignment films 27 and 28 for aligning liquid crystal molecules are formed thereon.
While maintaining a predetermined interval, the transparent glass substrate 2 is sealed with a sealing member 30 made of fiber glass or glass.
The liquid crystal 31 is sealed between 2 and 24. A backlight 32 illuminating the liquid crystal substrate 20 having the above configuration
Are disposed on the back side of the transparent glass substrate 24, that is, below in the figure.

The backlight 32 has the same basic structure as the light emitting display panel in the first to third embodiments described above, and includes the substrate 1, the clear layer 13, and the light transmitting substrate in the first to third embodiments. 5 and FIGS. 13 to 1
5, the light emitting layer 2, or the light emitting layer 2 and the reflective layer 4,
Alternatively, the light-emitting layer 2, the reflection layer 4, and the diffusion layer 9 are directly
Are bonded to each other via a transparent adhesive.

The light emitting layer 2 of the backlight 32 can also be printed in a dot or grid pattern.

FIGS. 16 to 18 are sectional views showing tenth to twelfth embodiments of a light emitting sheet having the same basic structure as the light emitting display panels in the first to third embodiments.
In the tenth to twelfth embodiments, the same reference numerals are given to the same components and parts having the same functions as those in the first to third embodiments. The light-emitting sheet shown in FIG. 16 includes a release paper 40 at the bottom in the figure, an adhesive layer 41 formed thereon by printing, and a first embodiment and the like formed by printing further thereon. The light-emitting layer 2 includes a light-emitting layer 2 having the same components as the light-emitting layer 2 and a light-transmitting overcoat layer 42 that covers the surface of the light-emitting layer 2. The overcoat layer 42 is formed on the surface of the light emitting layer 2 by printing a resin having a light transmitting property, and an acrylic resin, an epoxy resin, a urethane resin, or the like can be used. Moreover, the overcoat layer 4 is formed by printing such a resin.
Without forming 2, the light-transmitting sheet or film can be formed by adhering to the light-emitting layer 2 with a transparent adhesive. Further, the overcoat layer 42 may be a colored sheet having translucency.

The light emitting sheet is peeled off from the release paper 40,
It is used by attaching the adhesive layer 41 to an adherend.
At that time, if the adhesive layer 41 has translucency,
The light-emitting sheet irradiates light in any of the upper and lower directions in FIG.

The light emitting sheet shown in FIG.
In the light emitting sheet shown in FIG. 5, a reflective layer 4 similar to that in the second embodiment is provided between the adhesive layer 41 and the light emitting layer 2. The reflection layer 4 in the present embodiment is formed by printing a white paint, but may be a white sheet-like member. May be used as a paint.

Further, the light emitting sheet shown in FIG.
The reflective layer 4 is provided between the overcoat layer 42 and the light emitting layer 2 in the light emitting sheet shown in FIG. In the case of such a configuration, light emitted from the light emitting layer 2 emits light from the adhesive layer 41.
Therefore, the adhesive layer 41 needs to have a light-transmitting property.

As shown in FIGS. 19 and 20, the diffusion layer 9 in the third embodiment is provided between the light emitting layer 2 and the reflective layer 4 in the light emitting sheets shown in FIGS.
Light can be diffused to obtain uniform light emission.

The light emitting layer 2 in the tenth to twelfth embodiments shown in FIGS. 16 to 18 can also be printed and formed in a dot shape or a grid shape.

The light-emitting sheet has a transparent display panel,
For example, it can be used as nighttime display illumination by being attached to the front or back surface of a display panel for a vehicle, a display panel of an audio device, a dial for a clock, a display panel for displaying a location, or the like. In particular, since the light emitting layer 2 using a high light emitting material is used, the light emitting luminance is extremely high, and the light emitting sheet alone can be used as illumination in the dark or as a location confirmation display of an article. Use is wide.

[0071]

According to the present invention, since the light emitting layer containing the high light emitting material is provided on the front surface of the substrate or the back surface of the light transmitting substrate, it can be excited in a short time, and only a few Simply by applying light, a higher light emission luminance than the conventional one can be obtained, and the afterglow time can be significantly extended.

Further, since the light emitting layer is formed in the shape of a dot, the light emitting surface area of the light emitting layer can be greatly increased. Since the light is irradiated to the surface direction from the gaps between the dots in the light emitting layer, the luminance can be dramatically increased, and the afterglow time can be significantly extended.

Further, since the luminance can be greatly increased, sufficient brightness can be ensured even if the thickness of the light emitting layer is reduced. Therefore, the number of times of printing required to perform the printing can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a light emitting display panel according to a first embodiment of the present invention.

FIG. 2 is a half sectional view showing a light emitting display panel according to a second embodiment of the present invention.

FIG. 3 is a half sectional view showing a light emitting display panel according to a third embodiment of the present invention.

FIG. 4 is an enlarged view of a main part of the light emitting display panel shown in FIG.

FIG. 5 is an enlarged plan view of a main part of the light emitting display panel shown in FIG.

FIG. 6 is an enlarged plan view of a main part showing an example in which the shape of the dot shown in FIG. 5 is changed.

FIG. 7 is an enlarged sectional view of a main part when the light emitting display layer shown in FIG. 1 is formed in a dot shape.

8 is an enlarged sectional view of a main part when the light emitting display layer shown in FIG. 2 is formed in a dot shape.

FIG. 9 is a sectional view showing a fourth embodiment in which the light emitting display panel in the first embodiment is changed to a solar clock dial for a timepiece used in a solar-powered portable timepiece powered by a solar cell.

FIG. 10 is a sectional view showing a fifth embodiment in which the light emitting display plate in the second embodiment is changed to a solar clock dial for a timepiece used in a solar-equipped portable timepiece powered by a solar cell.

FIG. 11 is a cross-sectional view showing a sixth embodiment in which the light-emitting display panel in the third embodiment is changed to a solar clock dial for use in a portable timepiece equipped with a solar cell powered by a solar cell.

FIG. 12 is a sectional view showing the structure of a solar-equipped mobile watch.

FIG. 13 is a sectional view showing a seventh embodiment of a liquid crystal display panel using a backlight having the same basic structure as the light emitting display panel in the first embodiment.

FIG. 14 is a sectional view showing an eighth embodiment relating to a liquid crystal display panel using a backlight having the same basic structure as the light emitting display panel in the second embodiment.

FIG. 15 is a sectional view showing a ninth embodiment relating to a liquid crystal display panel using a backlight having the same basic configuration as the light emitting display panel in the third embodiment.

FIG. 16 is a sectional view showing a tenth embodiment relating to a light emitting sheet having the same basic configuration as the light emitting display panel in the first embodiment.

FIG. 17 is a cross-sectional view showing an eleventh embodiment of a light emitting sheet having the same basic configuration as the light emitting display panel in the second embodiment.

FIG. 18 is a sectional view showing a twelfth embodiment relating to a light emitting sheet having the same basic configuration as the light emitting display panel in the third embodiment.

19 is a cross-sectional view of a case where a diffusion layer is provided between a light emitting layer and a reflective layer in the light emitting sheet shown in FIG.

20 is a cross-sectional view when a diffusion layer is provided between a light emitting layer and a reflective layer in the light emitting sheet shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Light emitting layer 4 Reflective layer 5 Translucent substrate 8 Adhesive layer 9 Diffusion layer 10 Microsphere 11 Light transmissive sheet 12 Case 14 Movement 15 Solar cell 16 Solar character plate 17 Cover glass 18 Support frame 19 Middle frame 20 Liquid crystal substrate 21 Upper polarizing plate 22 Transparent glass substrate 23 Lower polarizing plate 24 Transparent glass substrate 25 Segment electrode 26 Common electrode 27 Alignment film 28 Alignment film 29 Spacer 30 Sealing member 32 Backlight 40 Release paper 41 Adhesive layer 42 Overcoat layer

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[Procedure amendment]

[Submission date] September 22, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 13

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 14

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

Claims (16)

[Claims] (1) A compound of the general formula (SrEu) Al ₂ O _4.
n (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)] [wherein Q is B
i, at least one selected from Ca, Mg, and Mn, a is 0.0005 ≦ a ≦ 0.002, b
Is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦
A light emitting layer comprising a high light emitting material formed of a fired body according to claim 7) is formed on the entire surface or a part of the surface of the substrate. 2. The compound of the general formula (SrEu) Al ₂ O _4.
n (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)] [wherein Q is B
i, at least one selected from Ca, Mg, and Mn, a is 0.0005 ≦ a ≦ 0.002, b
Is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦
And a light-reflecting layer provided with a light-reflecting layer formed on the whole or a part of the back surface of the light-transmitting substrate having a light-transmitting property. Light-emitting display panel. 3. The light emitting display panel according to claim 2, wherein a light diffusion layer is formed between said light emitting layer and said reflection layer. 4. The light emitting display panel according to claim 1, wherein the light emitting layer is formed in a dot shape or a grid shape. 5. The solar dial for a timepiece according to claim 1, wherein said substrate is formed of a translucent substrate. 6. The timepiece solar dial according to claim 5, wherein a light diffusion layer is formed between the light emitting layer and the substrate. 7. The solar dial for a timepiece according to claim 5, wherein the light emitting layer is formed in a dot shape or a grid shape. 8. A first transparent glass substrate having an upper polarizing plate formed on the front surface and a second transparent glass substrate having a lower polarizing plate formed on the back surface are opposed to each other. A segment electrode and a common electrode are formed on opposing inner surfaces of the glass substrate, and an alignment film for aligning liquid crystal molecules is formed on the segment electrode and the common electrode. A liquid crystal substrate having liquid crystal sealed between the first and second transparent glass substrates, and a general formula (SrEu) Al ₂ O ₄
・ [(SrEu) O ・ n (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)]
[Wherein, Q is at least one selected from Bi, Ca, Mg, and Mn, and a is 0.0005 ≦ a ≦ 0.
002, b is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦ 7], and a backlight composed of a luminescent layer containing a highly luminescent material composed of a fired body; A liquid crystal display panel comprising: 9. The liquid crystal display panel according to claim 8, wherein a reflection layer is provided on a back surface side of the light emitting layer. 10. The liquid crystal display panel according to claim 9, wherein a light diffusion layer is provided between said light emitting layer and said reflection layer. 11. The light emitting layer according to claim 8, wherein the light emitting layer is formed in a dot shape or a grid shape.
Liquid crystal display panel as described. 12. The formula (SrEu) Al ₂ O _4. [(SrEu) O
・ N (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)] [where Q is B
i, at least one selected from Ca, Mg, and Mn, a is 0.0005 ≦ a ≦ 0.002, b
Is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦
7), wherein a light emitting layer containing a high light emitting material comprising a fired body is provided between the overcoat layer and the adhesive layer. 13. The formula (SrEu) Al ₂ O _4. [(SrEu) O
・ N (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)] [where Q is B
i, at least one selected from Ca, Mg, and Mn, a is 0.0005 ≦ a ≦ 0.002, b
Is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦
7) is provided on the entire surface or a part of the surface of the reflection layer provided between the overcoat layer having a light-transmitting property and the adhesive layer. A luminescent sheet characterized by the above-mentioned. 14. The formula (SrEu) Al ₂ O _4. [(SrEu) O
・ N (Al _1-ab B _b Q _a ) ₂ O ₃ (OH)] [where Q is B
i, at least one selected from Ca, Mg, and Mn, a is 0.0005 ≦ a ≦ 0.002, b
Is 0.001 ≦ b ≦ 0.35, and n is 1 ≦ n ≦
7) is provided on the whole or a part of the back surface of the reflective layer provided between the overcoat layer and the adhesive layer having translucency. A luminescent sheet characterized by the above-mentioned. 15. A light diffusion layer is formed between the light emitting layer and the reflection layer.
The luminescent sheet according to the above. 16. The light emitting layer according to claim 12, wherein the light emitting layer is formed in a dot shape or a grid shape.
16. The luminescent sheet according to 4 or 15.