LCD-TFT controller (LTDC) RM0090
480/1749 RM0090 Rev 18
16 LCD-TFT controller (LTDC)
This section applies only to STM32F429xx/439xx devices.
16.1 Introduction
The LCD-TFT (Liquid Crystal Display - Thin Film Transistor) display controller provides a
parallel digital RGB (Red, Green, Blue) and signals for horizontal, vertical synchronisation,
Pixel Clock and Data Enable as output to interface directly to a variety of LCD and TFT
panels.
16.2 LTDC main features
• 24-bit RGB Parallel Pixel Output; 8 bits-per-pixel (RGB888)
• 2 display layers with dedicated FIFO (64x32-bit)
• Color Look-Up Table (CLUT) up to 256 color (256x24-bit) per layer
• Supports up to XGA (1024x768) resolution
• Programmable timings for different display panels
• Programmable Background color
• Programmable polarity for HSync, VSync and Data Enable
• Up to 8 Input color formats selectable per layer
–ARGB8888
– RGB888
– RGB565
–ARGB1555
–ARGB4444
– L8 (8-bit Luminance or CLUT)
– AL44 (4-bit alpha + 4-bit luminance)
– AL88 (8-bit alpha + 8-bit luminance)
• Pseudo-random dithering output for low bits per channel
– Dither width 2-bits for Red, Green, Blue
• Flexible blending between two layers using alpha value (per pixel or constant)
• Color Keying (transparency color)
• Programmable Window position and size
• Supports thin film transistor (TFT) color displays
• AHB master interface with burst of 16 words
• Up to 4 programmable interrupt events
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