一般display cpu端都会有Video Output Processor (VOP)和Display Serial Interface (DSI)两部分。
VOP:
以某一平台为例,VOP feature如下:
• Parallel RGB LCD Interface: 24-bit/18-bit/15-bit
• eDPI interface for MIPI_DSI
• Interlace output (480i/576i/1080i)
• Max output resolution: 1920x1080
• Background layer: programmable 24-bit color
• Win0 layer:
– RGB888, ARGB888, RGB565, YCbCr422, YCbCr420, YCbCr444
– 1/8 to 8 scaling-down and scaling-up engine
– Support interlace de-flicker
– Support virtual display
• Win1 layer:
– RGB888, ARGB888, RGB565
– Support virtual display
• Hardware cursor:
– 8bpp color palette
– Support two size: 32x32 and 64x64
• Win0 layer and Win1 layer overlay exchangeable
• Color space conversion(YCbCr2RGB/RGB2YCbCr)
• Transparency color key for win0 and win1
• Alpha blending
– Normal alpha