Ilpi354 Va Schematic: Upd

ILPI354 VA Schematic — Write-up Overview The ILPI354 VA is a vertical-alignment (VA) LCD driver/display module (assumed family name ILPI354). This write-up summarizes the VA panel schematic, key signal chains, power rails, and design considerations for integration into a display system. Block diagram (logical)

Display panel (VA LCD glass) with integrated column/row drivers (or external driver ICs). LVDS/eDP/MIPI DSI input receiver → timing controller (TCON). TCON → gate driver (row) and source driver (column) interfaces. Power management (panel power rail generation) supplying VGH, VGL, AVDD, VCOM, VCC, VCCIO. Backlight LED string(s) driven by LED driver (constant current) with PWM dimming input. Control I2C/SPI for TCON settings and OSD/EEPROM (timing, gamma). Protection: ESD diodes on LVDS/MIPI lines, TVS on input, fuses for LED string.

Key signals and connectors

Main video input: typical LVDS or eDP connector pins (differential pairs for channels, clock, often 4–8 lanes). LVDS pairs: CH0+/CH0– … CHN+/CHN– and CK+/CK–. Control: I2C/SDA, SCL (for EDID/EEPROM), PS_ON or EN pin, RESET. Backlight: BL+ and BL– (LED string outputs), PWM_DIM, EN_LED. Power rails: ilpi354 va schematic upd

VCC (logic 3.3V for TCON) VCCIO (1.8V/3.3V IO) AVDD (source driver positive bias, e.g., 12–20V depending on panel) VGH (gate high, often ~20–25V) VGL (gate low, often ~-8 to -6V) VCOM (common electrode voltage, adjustable ~2–6V)

Ground: multiple GND pins and shield ground.

Power sequencing

Apply logic supply (VCC/VCCIO). Apply AVDD/VGH/VGL rails after logic stable. Apply VCOM after AVDD stable. Enable backlight only after panel signals are stable and TCON initialized. Shutdown reverse sequence: turn off backlight, then VCOM, then high-voltage rails, then logic.

Voltage/current typical ranges (assumed; verify against datasheet)

VCC/VCCIO: 3.3V / 1.8–3.3V, Icc depends on TCON (~tens of mA). AVDD: 10–18V, tens to hundreds mA (source drivers). VGH: +18–25V peak. VGL: –6 to –10V. VCOM: adjustable ~2–6V (set via potentiometer or programmable DAC). Backlight: LED forward string voltage depending on panel (e.g., 30–60V) with current 10–1000 mA depending on brightness and panel size. ILPI354 VA Schematic — Write-up Overview The ILPI354

Timing and signal integrity

Route LVDS/eDP differential pairs with controlled impedance (100 Ω differential). Keep pair length matching within ~5–10 mm for LVDS; tighter for high-speed eDP. Terminate differential pairs at receiver with recommended resistor networks. Place decoupling caps close to TCON and driver IC power pins; bulk caps on high-voltage rails. Add common-mode chokes and series resistors if EMI/overshoot observed.