Structure of a 320-dpi 4-inch a-Si:H TFT Reflective Stacked Crossed Guest-Host Display

We have developed a 320-dpi a-Si:H TFT reflective stacked crossed guest-host display, in which a thin polymer film is used to separate two orthogonally aligned nematic guest-host liquid crystal layers, avoiding parallax and the need to drive the two layers independently. A newly designed pattern of photolithographically defined spacers that hold the thin film in a precise position and the assembly process for the stacked structure are described.