Illuminating glazing panel

1. An illuminating glazing unit, comprising;

a first sheet, made of mineral or organic glass, having a first main face, a second main face and an edge face;

a second sheet, made of mineral or organic glass, having a first main face, a second main face and an edge face;

a lamination interlayer, making adhesive contact with the second main face of the first sheet and with the first main face of the second sheet, said lamination interlayer having an extent smaller than that of each of the first and second glass sheets and thus defining a groove-shaped space between an edge of the second main face of the first sheet and an edge of the first main face of the second sheet;

at least one strip of light-emitting diodes, comprising a printed circuit board and a plurality of light-emitting diodes, positioned so that the emitting faces of the light-emitting diodes face the edge face of the first sheet; and

an encapsulating element made of an opaque polymer encapsulating at least the edge face of the second sheet and the at least one strip of light-emitting diodes, wherein the printed circuit board bears against the first main face of the second glass sheet by way of a plurality of spacers and wherein the groove-shaped space is filled by the opaque polymer of the encapsulating element.

2. The illuminating glazing unit as claimed in claim 1 , wherein the second sheet is of larger extent than the first sheet and extends beyond the latter at least on an edge of the glazing unit where the at least one strip of light-emitting diodes is located.

3. The illuminating glazing unit as claimed in claim 1 wherein the printed circuit board extends into the groove-shaped space defined by the lamination interlayer between the first and second sheet.

4. The illuminating glazing unit as claimed in claim 1 further comprising an opaque enamel applied to the edge of the first main face of the second sheet, said enamel being of sufficient extent to mask the groove-shaped space filled by the opaque polymer of the encapsulating element.

5. The illuminating glazing unit as claimed in claim 1 wherein the groove-shaped space filled by the opaque polymer of the encapsulating element has a thickness comprised between 0.2 and 2 mm, and a depth comprised between 0.2 cm and 2 cm.

6. The illuminating glazing unit as claimed in claim 1 wherein the spacers are placed in order not to be aligned only on a single straight line.

7. The illuminating glazing unit as claimed in claim 1 wherein the spacers are aligned along two straight lines, parallel to each other.

8. The illuminating glazing unit as claimed in claim 1 wherein a height of the spacers is comprised between 200 and 1000 μm.

9. The illuminating glazing unit as claimed in claim 1 wherein the spacers are made of a material having a thermal conductivity λ at least equal to 200 W/mK.

10. The illuminating glazing unit as claimed in claim 1 wherein the spacers are made of a metal.

11. The illuminating glazing unit as claimed in claim 1 wherein the spacers are an integral part of the printed circuit board and are made of the same material as the latter.

12. A process for manufacturing an illuminating glazing unit according to claim 1 , comprising in succession:

providing a laminated glazing unit, comprising:

a first sheet, made of mineral or organic glass, having a first main face, a second main face and an edge face;

a second sheet, made of mineral or organic glass, having a first main face, a second main face and an edge face;

a lamination interlayer, making adhesive contact with the second main face of the first sheet and with the first main face of the second sheet, said lamination interlayer having an extent smaller than that of each of the first and second glass sheets and thus defining a groove-shaped space between an edge of the second main face of the first sheet and an edge of the first main face of the second sheet;

positioning at least one strip of light-emitting diodes comprising a printed circuit board and a plurality of light-emitting diodes, so that emitting faces of the light-emitting diodes face the edge face of the first sheet, and so that the printed circuit board bears against the first main face of the second glass sheet by way of a plurality of spacers; and

forming an encapsulating element made of an opaque polymer encapsulating at least the edge face of the second sheet, and the at least one strip of light-emitting diodes, and filling the groove-shaped space between the edge of the second main face of the first sheet and the edge of the first main face of the second sheet.

13. The process as claimed in claim 12 , wherein the forming comprises injecting, into a mould surrounding an edge of the glazing unit, a composition of thermosetting monomers, and heating said injected composition to a temperature and for a sufficient amount of time to cause it to set.

14. The illuminating glazing unit as claimed in claim 5 , wherein the thickness is comprised between 0.3 and 1.5 mm and the depth is comprised between 0.3 cm and 1.0 cm.

15. The illuminating glazing unit as claimed in claim 7 , wherein the two straight lines are parallel to the edge of the printed circuit board and to the edge of the second sheet.

16. The illuminating glazing unit as claimed in claim 8 , wherein the height of the spacers is comprised between 400 and 700 μm.

17. The illuminating glazing unit as claimed in claim 9 , wherein the thermal conductivity λ is at least equal to 230 W/mK.

18. The process as claimed in claim 13 , wherein the composition comprises at least one polyisocyanate and a polyol.