LCD屏DPI的计算方法

1. DPI

    水平方向: Hdpi = H_resolution x 1_inch / H_length

    垂直方向: Vdpi = V_resolution x 1_inch / V_length

2. pixel pitch (单个像素宽度)

   H pixel pitch = H_length / H_resolution

   V pixel pitch = V_length / V_resolution

    

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