Smart serial screen FAQ: hardware

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This section covers hardware selection for smart serial screens: capacitive vs resistive touch (capacitive offers better transmittance and finger experience but weaker noise immunity and stricter power requirements; Hywintek resistive screens are very sensitive, so resistive remains the recommended choice); LCD lifetime (glass 15-20 years; polarizer films about 10 years depending on the environment; backlight half-brightness at 20,000-30,000 hours, dimming extends life); speaker selection for voice screens (8 ohm 5 W is loud enough; 4R not below 5 W, 8R not below 3 W); how newcomers should choose (the E series is recommended: HMI command screens use the open toolchain, while E series provides icons, curves, text widgets with RAM-mapped variables that greatly simplify command code).