Heatable windshield

1. A heatable transparency, comprising:

a first ply having a No. 1 surface and a No. 2 surface;

a second ply having a No. 3 surface and a No. 4 surface, with the No. 2 surface facing the No. 3 surface;

a vision area; and

an electrically conductive coating formed in at least a portion of the vision area over at least a portion of the No. 2 or No. 3 surface, wherein the conductive coating comprises three or more metallic silver layers, and wherein the coating has a resistivity in the range of 0.6 Ω/□ to 1.7 Ω/□ at a supplied power in the range of 13 volts to 15 volts,

wherein the transparency has a visible light transmittance of greater than or equal to 70% at a reference wavelength of 550 nm.

2. The transparency of claim 1 , wherein the first and/or second ply have a visible light transmittance of greater than 91% at a reference wavelength of 550 nm.

3. The transparency of claim 1 , wherein a glass composition for the first and/or second ply has a total iron content in the range of greater than 0 to 0.2 wt. %.

4. The transparency of claim 3 , wherein the glass composition has a redox ratio in the range of 0.3 to 0.6.

5. The transparency of claim 1 , wherein the conductive coating comprises at least one dielectric layer.

6. The transparency of claim 1 , wherein the conductive coating includes an oxygen barrier coating layer.

7. The transparency of claim 6 , wherein the oxygen barrier layer comprises at least one of silica, alumina, and combinations thereof.

8. The transparency of claim 1 , further including an antireflective coating over at least a portion of the No. 2 or No. 3 or No. 4 surfaces.

9. The transparency of claim 8 , wherein the antireflective coating is a multi-layer coating comprising at least one layer comprising a material having an index of refraction of less than or equal to 1.75 and at least one layer comprising a material having an index of refraction of greater than 1.75.

10. The transparency of claim 9 , wherein the antireflective coating comprises a first layer having a refractive index of greater than 1.75, a second layer deposited over the first layer and having a refractive index of less than or equal to 1.75, a third layer deposited over the second layer and having a refractive index of greater than 1.75, and a fourth layer deposited over the third layer and having a refractive index of less than or equal to 1.75.

11. The transparency of claim 10 , wherein the fourth layer has a thickness in the range of 0.7 to 1.5 quarter wave.

12. The transparency of claim 8 , wherein the antireflective coating is on at least a portion of the No. 4 surface.

13. The transparency of claim 1 , wherein the coating is configured to provide a power density in the range of 2 to 10 W/dm 2 .

14. The transparency of claim 13 , wherein the coating is configured to provide a power density in the range of 4 to 8 W/dm 2 .

15. The transparency of claim 1 , wherein the coating has a resistivity in the range of 0.8 Ω/□ to 1.3 Ω/□.

16. The transparency of claim 1 , wherein the conductive coating is in electrical contact with the power supply by a bus bar assembly.

17. A heatable laminated transparency, comprising:

a first ply having a No. 1 surface and a No. 2 surface;

a second ply having a No. 3 surface and a No. 4 surface, with the No. 2 surface facing the No. 3 surface;

an electrically conductive coating formed on at least a portion of the No. 2 or No. 3 surface, the conductive coating comprising three or more metallic silver layers and the conductive coating configured to provide a resistivity in the range of 0.6 Ω/□ to 1.70 Ω/□ at a supplied power in the range of 13 volts to 15 volts; and

an antireflective coating formed on the No. 4 surface, the antireflective coating comprising at least one zinc stannate layer and at least one zinc oxide layer,

wherein the laminated transparency has a visible light transmittance of greater than or equal to 70% at a reference wavelength of 550 nm.