Optical fitting will select and/or verify the COG’s pitch, orientation, location and surface coatings’ net compatibility with the application’s specific display.
Because a diffractive interference pattern (moiré) can occur due to the optical interference between the conductive optical grid and the light transmitting pixels of the electronic display, at a minimum it is often necessary to rotate the grid to reduce or eliminate this interference. Because most displays have a pixel orientation at 90 degrees, the moiré effect can often be minimized by rotating the grid at a 45-degree orientation. In addition to rotating the mesh, altering the pitch, grid depth in the substrate or surface finish of the substrate can also minimize this moiré pattern. Dontech designates grid orientation as degrees from the positive horizontal axis. Common grid orientations to reduce moiré include 45 degrees, 30 degrees, and 22.5 degrees. As a service, Dontech utilizes both pre-production and in-process testing to verify that the designed orientation does not produce a moiré pattern.
Dontech has extensive engineering and technical support resources that can assist you with your moiré compensation design needs. Our technical staff have diverse backgrounds relevant to high-performance display and precision optics markets. For many of our top customers, we function as an extension of their engineering departments, supporting projects from concept to final system delivery. We will integrate our optical filters and other enhancing components into touchscreens, displays, and systems to the level that is needed by our customers.