Does your module have or 20 pins , and is it a character (blocks for letters) or graphic display? Help to find info of an LCD - Displays - Arduino Forum
When looking at the back of an LCD module, the text printed on the green fiberglass substrate is often mistaken for the display's part number. Here is what those terms actually mean: phico d0 94v0 lcd display datasheet pdf
If you see two separate pins that are clearly for powering the backlight, use your multimeter's diode mode. If you see a forward voltage drop (around 1.8V to 3.3V), they are connected to an LED backlight. If you see a very low resistance (a few ohms), it is likely an incandescent bulb backlight. Does your module have or 20 pins ,
The (manufactured under various series by Data Vision ) is an industrial-grade dot-matrix and graphic screen variant relied on heavily in legacy systems, PLCs, and medical equipment . The marking 94V-0 designates its UL 94 flammability safety rating, proving its high fire-retardant properties under demanding operational stress. If you see a forward voltage drop (around 1
Most PHICO character modules use the industry-standard Hitachi HD44780-compatible 16-pin interface: Pin VSS Ground (0V) 2 VDD Power Supply (+5V) 3 VO Contrast Adjustment (via potentiometer) 4 RS Register Select (H: Data / L: Instruction) 5 R/W Read/Write (H: Read / L: Write) 6 E Enable Signal 7-14 DB0-DB7 Data Bus Lines (DB7 used for Busy Flag) 15 A (LED+) Backlight Anode (+5V) 16 K (LED-) Backlight Cathode (0V)