Glass pane as head-up display

Abstract

A glass pane is described. The glass pane has at least one pane, and one adhesive layer on the pane. The adhesive layer has at least one thermoplastic film with a luminescent pigment and a barrier film with an anti-scratch coating.

Claims

1. A glass pane, comprising: a pane, and an adhesive layer on the pane, wherein the adhesive layer comprises at least one thermoplastic film with a first luminescent pigment distributed in the at least one thermoplastic film and a barrier film with an anti-scratch coating, wherein the first luminescent pigment contains a hydroxyalkyl terephthalate with formula: R.sub.1COOP(OH)xCOOR.sub.2, where R.sub.1, R.sub.2 is an alkyl or allyl residue with 1 to 10 C atoms, P is a phenyl ring, OH is hydroxyl groups bonded to the phenyl ring, and x is the number of hydroxyl groups bonded to the phenyl ring having a value between 0 and 4.

2. The glass pane according to claim 1, wherein the barrier film contains a second luminescent pigment.

3. The glass pane according to claim 2, wherein the first luminescent pigment or the second luminescent pigment have an excitation maximum in a range from 350 nm to 450 nm, an emission maximum in a range from 400 nm to 800 nm, or an excitation maximum in a range from 350 nm to 450 nm and an emission maximum in a range from 400 nm to 800 nm.

4. The glass pane according to claim 3, wherein the excitation maximum is in the range of 390 nm to 420 nm.

5. The glass pane according to claim 3, wherein the emission maximum is in the range from 430 nm to 500 nm.

6. The glass pane according to claim 1, wherein the pane comprises a prestressed or partially prestressed safety glass.

7. The glass pane according to claim 1, wherein the barrier film contains polybutylene terephthalate, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyvinyl chloride, polyvinyl fluoride, polyvinyl butyral without plasticizer, and/or mixtures and copolymers thereof.

8. The glass pane according to claim 7, wherein the barrier film contains polyethylene terephthalate.

9. The glass pane according to claim 1, wherein the anti-scratch coating contains organically or inorganically bound SiO.sub.2, TiO.sub.2, Al.sub.2O.sub.3, or Si.sub.3N.sub.4.

10. The glass pane according to claim 9, wherein the anti-scratch coating contains organically or inorganically bound polysiloxane.

11. The glass pane according to claim 1, wherein the adhesive layer has a thickness of 0.30 mm to 0.9 mm.

12. The glass pane according to claim 11, wherein the adhesive layer has a thickness of 0.50 mm to 0.80 mm.

13. The glass pane according to claim 1, wherein the first luminescent pigment contains benzopyranes, naphthopyranes, 2H-naphthopyranes, 3H-naphthopyranes, 2H-phenanthropyranes, 3H-phenanthropyranes, photochromic resins, coumarins, xanthines, naphthalic acid derivatives, oxazoles, stilbenes, styryls, perylenes, lanthanides, and/or mixtures thereof.

14. The glass pane according to claim 13, wherein the first luminescent pigment contains Y.sub.2O.sub.3:Eu, YVO.sub.4:Tm, Y.sub.2O.sub.2S:Pr, Gd.sub.2O.sub.2S:Tb, and/or mixtures thereof.

15. The glass pane according to claim 1, wherein the pane has a thickness of 1 mm to 8 mm.

16. The glass pane according to claim 15, wherein the pane has a thickness of 1.4 mm to 2.5 mm.

17. The glass pane according to claim 1, wherein the barrier film has a metallic coating.

18. The glass pane according to claim 17, wherein the metallic coating is ZnO, Ag, In.sub.2O.sub.3, Ti, TiO.sub.2, and/or AlN.

19. A device for displaying a pictogram, graphic characters, and/or numbers, comprising: the glass pane according to claim 1, and a light source directed to the glass pane, wherein the light source emits electromagnetic radiation onto the glass pane.

20. The device according to claim 19, wherein the light source comprises a laser.

21. The device according to claim 20, wherein the laser is a diode laser.

22. The glass pane according to claim 1, wherein the first luminescent pigment contains diethyl 2,5-dihydroxyterephthalate.

23. A method for producing a glass pane, comprising: bonding at least one thermoplastic film and a barrier film with an anti-scratch coating to form an adhesive layer, applying a luminescent pigment on the at least one thermoplastic film of the adhesive layer, laminating the adhesive layer between a pane and a lamination pane, removing the lamination pane, and obtaining the glass pane having the pane and the adhesive layer on the pane, wherein the adhesive layer comprises the at least one thermoplastic film with the luminescent pigment distributed in the at least one thermoplastic film and the barrier film with the anti-scratch coating, wherein the luminescent pigment contains a hydroxyalkyl terephthalate with formula: R.sub.1COOP(OH)xCOOR.sub.2, where R.sub.1, R.sub.2 is an alkyl or allyl residue with 1 to 10 C atoms, P is a phenyl ring, OH is hydroxyl groups bonded to the phenyl ring, and x is the number of hydroxyl groups bonded to the phenyl ring having a value between 0 and 4.

24. A method comprising: using a glass pane as a head-up display in buildings, billboards, motor vehicles, airplanes, and/or helicopters, wherein the glass pane comprises a pane and an adhesive layer on the pane, wherein the adhesive layer comprises at least one thermoplastic film with a first luminescent pigment and a barrier film with an anti-scratch coating, wherein the first luminescent pigment contains a hydroxyalkyl terephthalate with formula: R.sub.1COOP(OH)xCOOR.sub.2, where R.sub.1, R.sub.2 is an alkyl or allyl residue with 1 to 10 C atoms, P is a phenyl ring, OH is hydroxyl groups bonded to the phenyl ring, and x is the number of hydroxyl groups bonded to the phenyl ring having a value between 0 and 4.

25. The method according to claim 24, wherein the glass pane is used as windshield in motor vehicles or as a billboard.

Description

(1) In the following, the invention is explained in detail with reference to the drawings and an exemplary embodiment as well as a comparative example. The drawings are purely schematic representations and are not to scale. They in no way restrict the invention.

(2) They depict:

(3) FIG. 1 a cross-section of a laminated glass pane with luminescent particles according to the prior art,

(4) FIG. 2 a cross-section of a glass pane according to the invention,

(5) FIG. 3 a cross-section of the adhesive layer according to the invention,

(6) FIG. 4 a cross-section of a preferred embodiment of the adhesive layer according to the invention,

(7) FIG. 5 a schematic view of the device according to the invention.

(8) FIG. 1 depicts a cross-section of a glass pane (I) with luminescent particles (2a) according to the prior art. The glass pane (I) comprises at least one pane (1), one other pane (6), and at least one polymer adhesive layer (2). The adhesive layer (2) comprises a thermoplastic film (2b) made of PVB and luminescent pigments or dyes (2a), which are statistically distributed in the thermoplastic film (2b) after lamination of the glass pane (1). The broad distribution of the pigments (2a) in the thermoplastic film (2b) makes a high pigment concentration necessary, since luminosity is adequately high only with high pigment density (2a).

(9) FIG. 2 depicts a cross-section of a glass pane (II) according to the invention. The glass pane (II) comprises at least one pane (I) and at least one polymer adhesive layer (2). The adhesive layer (2) comprises a first thermoplastic film (2b) made of PVB and luminescent pigments (2a) distributed in the thermoplastic film (2b). Following the first thermoplastic film (2b) is a barrier film (2c) made of PET, which is virtually free of luminescent pigments or dyes (2a). The expression virtually free means, in the context of the invention, no emission of electromagnetic radiation in the barrier film (2c) discernible to the naked eye upon excitation with a suitable radiation source. The barrier film (2c) contains an anti-scratch coating (2d) made of polysiloxane.

(10) FIG. 3 depicts an enlarged cross-section of the adhesive layer (2) according to the invention made of the thermoplastic film (2b) with luminescent particles (2a) as well as the barrier film (2c) following the thermoplastic film (2b) and anti-scratch coating (2d) made of polysiloxane.

(11) FIG. 4 depicts an enlarged cross-section of a preferred embodiment of the adhesive layer (2) according to the invention made of a thermoplastic film (2b) with luminescent particles (2a) and the barrier film (2c) following the first thermoplastic film (2b) and anti-scratch coating (2d). The barrier film (2c) has, adjacent the thermoplastic film (2b), a metallic coating (2e). This metallic coating can be implemented, for example, IR reflective or electrically heatable.

(12) FIG. 5 depicts a cross-section of the device according to the invention. The glass pane (II) comprises a pane (1) and adhesive layer (2). The adhesive layer (2) is illuminated by a light source (4), preferably a laser scanner. The luminescent pigments (2a) situated in the adhesive layer (2) emit light that is perceived by the viewer.

LIST OF REFERENCE CHARACTERS

(13) (1) pane,

(14) (2) adhesive layer,

(15) (2a) luminescent pigment or dye,

(16) (2b) thermoplastic film,

(17) (2c) barrier film,

(18) (2d) anti-scratch coating,

(19) (2e) coating between barrier film and thermoplastic film,

(20) (3) lamination pane,

(21) (4) light source,

(22) (5) viewer, and

(23) (6) second pane.