This library implements an Arduino/ESP32 API to drive the hardware on‑screen display engine in AMT630A‑based composite‑video LCD monitor boards. It exposes the chip's five independently positionable OSD windows, two font modes (LargeFont 16×22 and SmallFont 10×16), text and raw glyph drawing, custom glyphs in Font RAM, 4‑bit‑per‑pixel bitmap support with a 16‑entry palette and palette animation, opacity/video blending, per‑window 1×-4× scaling, hardware blink regions, window movement and batch updates. The package includes a Python image converter (GIF/PNG/JPEG/BMP) with RGB444‑aware quantization, resource limits and previews, examples for character‑set browsing, and helpers for Index RAM allocation (shared 512‑cell pool), Font RAM allocation (4,096‑word / 8,192‑byte), and common drawing primitives. Typical API calls include begin(), configureWindow(), writeString(), setVisible(), moveWindow(), updateDisplay()/forceUpdate(), and a service() loop.
Hardware notes and practical specifics emphasize that AMT630A boards vary: I2C is used (ESP32 defaults SDA=GPIO21, SCL=GPIO22), grounds must be common, and register C6 controls MCU vs external ownership - repeated external grabs can freeze the display on some stock firmwares. An optional GPIO‑driven 74HC4066 circuit and provided factory‑menu automation sequence (Menu, Menu, Menu, -, Menu, +, -, -, +, +, Menu with ~150-200 ms timings) were found to prevent contention on one tested three‑button monitor; this is firmware‑specific and not auto‑invoked by begin(). The README includes installation steps, wiring, tested button mappings, examples, and warnings to verify each board before use.
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