![]() “As a result, the color appearance of the PV and non-PV roof tiles can be quite similar. A similar paint layer can also be deposited onto the back surface of the non-PV roof tiles.” While keeping the front cover of the roof tile transparent, the back surface of the back cover can be coated with a layer of paint that matches the color of the textured surface of the photovoltaic structures to reduce the color contrast within the PV roof tile. By controlling the size and pattern of the surface texture of the polycrystalline-Si-based photovoltaic structures, one can reduce the “glow” of the photovoltaic structures. “First, to reduce the color contrast within a PV roof tile, the PV roof tile can encapsulate polycrystalline-Si-based photovoltaic structures. According to Tesla, there are ways to get around these challenges, such as adopting a robust color-management scheme and some adjustments in the Solar Roof tiles’ manufacturing line. Tesla notes that these issues are due to several factors, including tiny imperfections during the Solar Roofs’ manufacturing process or the fact that PV roof tiles tend to look different when viewed under different lighting and at different viewing angles. The color contrast between the photovoltaic structures and the glass cover can create a scene that is not aesthetically pleasing… Although the non-PV roof tiles can include similar glass covers as those of the PV roof tiles, the absence of embedded photovoltaic structures can result in the non-PV roof tiles having a different color appearance than that of the PV roof tiles.” “When viewed from a shallow angle (e.g., when the roof is viewed from the street), the dark-colored photovoltaic structures can become visible. Tesla described this issue in the background of its patent, titled “System and Method for Improving Color Appearance of Solar Roofs” and published on February 11, 2021.
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