LIGHT-EMITTING DISPLAY, INTERLAYER FILM FOR LAMINATED GLASS, LAMINATED GLASS, AND LIGHT-EMITTING DISPLAY SYSTEM

Abstract

The present invention aims to provide a thin, light, simply structured luminescent display capable of displaying a three-dimensional image under light irradiation, and an interlayer film for a laminated glass, a laminated glass, and a luminescent display system each including the luminescent display. Provided is a luminescent display including: a luminescent layer containing a luminescent material that becomes luminous in response to excitation light; and a reflecting layer that reflects visible light.

Claims

1. A luminescent display comprising: a luminescent layer containing a luminescent material that becomes luminous in response to excitation light; and a reflecting layer that reflects visible light.

2. The luminescent display according to claim 1, wherein the reflecting layer has a visible light reflectance of 10% or higher and 90% or lower.

3. The luminescent display according to claim 1, wherein the reflecting layer has a visible light transmittance of 30% or higher and 95% or lower.

4. The luminescent display according to claim 1, further comprising a transparent layer between the luminescent layer and the reflecting layer.

5. An interlayer film for a laminated glass, comprising: the luminescent display according to claim 1.

6. A laminated glass comprising: a pair of glass plates; and the interlayer film for a laminated glass according to claim 5 interposed between the pair of glass plates.

7. A luminescent display system comprising: the luminescent display according to claim 1; a light source configured to emit light of excitation wavelength for the luminescent material; and a light source configured to emit visible light to be reflected by the reflecting layer.

8. A luminescent display system comprising: the interlayer film for a laminated glass according to claim 5; a light source configured to emit light of excitation wavelength for the luminescent material; and a light source configured to emit visible light to be reflected by the reflecting layer.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0147] FIG. 1 includes schematic views showing an exemplary luminescent display of the present invention and illustrating the principle on which the luminescent display of the present invention displays a three-dimensional image.

DESCRIPTION OF EMBODIMENTS

[0148] The present invention is more specifically described in the following with reference to, but not limited to, examples.

Example 1

[0149] (1) Preparation of Polyvinyl Butyral

[0150] To a 2 m.sup.3 reactor equipped with a stirrer were charged 1,700 kg of a 7.5% by mass aqueous solution of PVA (degree of polymerization: 1,700, degree of saponification: 99 mol %), 74.6 kg of n-butyraldehyde, and 0.13 kg of 2,6-di-t-butyl-4-methyl phenol, and the entire mixture was cooled to 14 C. Subsequently, 99.44 L of 30% by mass nitric acid was added to the mixture to initiate the butyralization of PVA. Ten minutes after the end of the addition, the temperature was raised to 65 C. over 90 minutes, followed by further reaction for 120 minutes. Thereafter, the temperature was lowered to room temperature, and the precipitated solid was obtained by filtration. The solid was washed ten times with a 10-fold amount (by mass) of ion exchange water. The washed solid was sufficiently neutralized using a 0.3% by mass sodium hydrogen carbonate aqueous solution and was then washed ten times with a 10-fold amount (by mass) of ion exchange water. The resulting solid was dehydrated and dried, thereby obtaining polyvinyl butyral resin (PVB).

[0151] (2) Production of Luminescent Display and Laminated Glass

[0152] A luminescent plasticizer solution was prepared by adding 0.54 parts by weight of diethyl-2,5-dihydroxyterephthalate (available from Sigma-Aldrich, diethyl 2,5-dihydroxyterephthalate) to 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO). The entire amount of the obtained plasticizer solution was mixed and sufficiently kneaded with 100 parts by weight of the obtained polyvinyl butyral using a mixing roll to prepare a resin composition.

[0153] The obtained resin composition was extruded using an extruder to provide a luminescent layer having a thickness of 350 m.

[0154] An amount of 40 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) was mixed and sufficiently kneaded with 100 parts by weight of the obtained polyvinyl butyral using a mixing roll to prepare a resin composition.

[0155] The obtained resin composition was extruded using an extruder to provide a resin film layer having a thickness of 350 m.

[0156] A combiner film (available from Defi, DF05702) was provided as a reflecting layer. The reflecting layer was interposed between the luminescent layer and the resin film to prepare a laminated film (luminescent layer/reflecting layer/resin film layer).

[0157] The obtained laminated film as an interlayer film for a laminated glass was interposed between a pair of clear glass plates (thickness: 2.5 mm, 5 cm in length5 cm in width) to prepare a laminate. The laminate was pressed under vacuum at 90 C. for 30 minutes to be press-bonded using a vacuum laminator. The press-bonded laminate was subjected to further 20-minute press-bonding under 14 MPa at 140 C. using an autoclave, thereby obtaining a laminated glass.

Example 2

[0158] Europium acetate (Eu(CH.sub.3COO).sub.3) in an amount of 12.5 mmol was dissolved in 50 mL of distilled water. To the solution was added 33.6 mmol of trifluoroacetylacetone (TFA, CH.sub.3COCH.sub.2COCF.sub.3), and the mixture was stirred at room temperature for 3 hours. The mixture was filtered to obtain precipitated solid. The precipitated solid was washed with water, and recrystallized using methanol and distilled water to give Eu(TFA).sub.3(H.sub.2O).sub.2. Then, 5.77 g of the resulting complex (Eu(TFA).sub.3(H.sub.2O).sub.2) and 2.5 g of 1,10-phenanthroline(phen) were dissolved in 100 mL of methanol, followed by heating under reflux for 12 hours. After 12 hours, methanol was distilled off under reduced pressure, thereby obtaining a white product. The white product powder was washed with toluene so that unreacted materials were removed by suction filtration. Subsequently, toluene was distilled off under reduced pressure, thereby preparing a powder. Through recrystallization using a solvent mixture of toluene and hexane, Eu(TFA).sub.3phen was obtained.

[0159] A luminescent display and a laminated glass were produced as in Example 1 except that instead of 0.54 parts by weight of diethyl-2,5-dihydroxyterephthalate (available from Sigma-Aldrich, diethyl 2,5-dihydroxyterephthalate), 0.4 parts by weight of the obtained Eu(TFA).sub.3phen was added to 40 parts by weight of 3G0.

Example 3

[0160] Terbium acetate (Tb(CH.sub.3COO).sub.3) in an amount of 12.5 mmol was dissolved in 50 mL of distilled water. To the solution was added 33.6 mmol of trifluoroacetylacetone (TFA, CH.sub.3COCH.sub.2COCF.sub.3), and the mixture was stirred at room temperature for 3 hours. The mixture was filtered to obtain precipitated solid. The precipitated solid was washed with water, and recrystallized using methanol and distilled water to give Tb(TFA).sub.3(H.sub.2O).sub.2. Then, 5.77 g of the obtained complex (Tb(TFA).sub.3(H.sub.2O).sub.2) and 2.5 g of 1,10-phenanthroline(phen) were dissolved in 100 mL of methanol, followed by heating under reflux for 12 hours. After 12 hours, methanol was distilled off under reduced pressure, thereby obtaining a white product. The white product powder was washed with toluene so that unreacted materials were removed by suction filtration. Subsequently, toluene was distilled off under reduced pressure, thereby preparing a powder. Through recrystallization using a solvent mixture of toluene and hexane, Tb(TFA).sub.3phen was obtained.

[0161] A luminescent display and a laminated glass were produced as in Example 1 except that instead of 0.54 parts by weight of diethyl-2,5-dihydroxyterephthalate (available from Sigma-Aldrich, diethyl 2,5-dihydroxyterephthalate), 0.4 parts by weight of the obtained Tb(TFA).sub.3phen was added to 40 parts by weight of 3G0.

Comparative Example 1

[0162] A luminescent display and a laminated glass were produced as in Example 1 except that no reflecting layer was used.

Comparative Example 2

[0163] A luminescent display and a laminated glass were produced as in Example 1 except that a resin film layer was used instead of the luminescent layer to prepare a laminated film (resin film layer/reflecting layer/resin film layer), and that this laminated film was used.

[0164] (Evaluation)

[0165] The laminated glasses obtained in the examples and comparative examples were evaluated by the following method.

[0166] Table 1 shows the results.

[0167] (Evaluation of Three-Dimensional Image Display)

[0168] Each of the laminated glasses obtained in the examples and comparative examples in a size of 5 cm in length5 cm in width was placed in a dark room. The light sources were placed 10 cm away in the perpendicular direction from a surface of the laminated glass. Subsequently, a viewer was placed on the side to be irradiated with light, at an angle of 20 degrees relative to the surface of the laminated glass to be irradiated with light and at a shortest distance of 35 cm from the surface of the laminated glass. The laminated glass was then irradiated with light from the irradiation device. The viewer observed an image displayed on the laminated glass, and evaluated the image according to the following criteria. In Comparative Example 2, no image was displayed.

o (Good): A three-dimensional image was displayed.
x (Poor): No three-dimensional image was displayed.

TABLE-US-00001 TABLE 1 Comparative Comparative Example 1 Example 2 Example 3 Example 1 Example 2 Luminescent Thermoplastic Type PVB PVB PVB PVB layer resin Amount 100 100 100 100 (parts by weight) Plasticizer Type 3GO 3GO 3GO 3GO Amount 40 40 40 40 (parts by weight) Luminescent Type Diethyl 2,5- Eu(TFA).sub.3phen Tb(TFA).sub.3phen Dimethyl 2,5- material dihydroxyterephthalate dihydroxyterephthalate Amount 0.54 0.4 0.4 0.54 (parts by weight) Thickness 350 350 350 350 Reflecting Type Combiner film Combiner film Combiner film Combiner layer film Resin film Thermoplastic Type PVB PVB PVB PVB PVB layer resin Amount (parts by 100 100 100 100 100 weight) Plasticizer Type 3GO 3GO 3GO 3GO 3GO Amount 40 40 40 40 40 (parts by weight) Thickness 350 350 350 350 350 Evaluation (Three-dimensional image display) x x

INDUSTRIAL APPLICABILITY

[0169] The present invention can provide a thin, light, simply structured luminescent display capable of displaying a three-dimensional image under light irradiation, and an interlayer film for a laminated glass, a laminated glass, and a luminescent display system each including the luminescent display.

REFERENCE SIGNS LIST

[0170] 1 luminescent display [0171] 11 luminescent layer [0172] 111 image formed by luminescent from the luminescent material that is made luminous by excitation light [0173] 12 reflecting layer [0174] 121 image formed by visible light reflected by reflecting layer 12 [0175] 2 light source [0176] 3 viewer