Published 3 Sep 2026

Ericsson Displays

Overview

Ericsson cellphone LCDs
Phone	Resolution	Chip	LCD	Part num	Pinout	Interface	I2C addr	Voltage
t20	101×33 mono	PCF8558			pinout-1	I2C	0x70h, 0x71h	2.7V
t28	101×33 mono	PCF8558			pinout-1	I2C	0x70h, 0x71h	2.7V
t29	101×33 mono	PCF8558			pinout-1	I2C	0x70h, 0x71h	2.7V
t10	101×33 mono	OM 4086U/2/2			pinout-2	I2C	0x78h (only write mode)	2.7V
t18	101×33 mono	OM 4086U/2/2			pinout-2	I2C	0x78h (only write mode)	2.7V
t39	101×54 mono				pinout-3	I2C	0x76	2.8V
A1018	101×40? mono	PCF8558			pinout-1	I2C	0x70h, 0x71h	2.8V
A2618	102/101?x64 mono	Philips PCF 8548			pinout-4	I2C	0x7A, 0x7B	2.8V
A2628	102/101?x64 mono	Philips PCF 8548			pinout-4	I2C	0x7A, 0x7B	2.8V
R310	101×33 mono	OM 4086U/2/2	LPH7754		pinout-1	I2C	0x78h (only write mode)	2.7V

Hardware description

pinout-1

The lcd has 5 pins:
Pin	Label	Description
1	Vlcd	6.4V
2	Vlogic	2.7V
3	Sdata	I2C data
4	Gnd
5	Sclk	I2C clock

pinout-2

The lcd has 5 pins:
Pin	Label	Description
1	Vlcd	+6.4V
2	Vlogic	+2.7V
3	Sdata	I2C data
4	Gnd
5	Sclk	I2C clock

pinout-3

The lcd has 8 pins:
Pin	Label	Description
1	El1	(cca. 50V / 100 KHz)
2	_Reset
3	Sclk	I2C clock
4	Gnd
5	Sdata	I2C data
6	Vlogic	2.8V
7	Vlcd	from internal dc/dc convertor
8	El2

pinout-4

The lcd has 6 pins:
Pin	Label	Description
1	_Reset
2	Vlogic	2.8V
3	Sdata	I2C data
4	Sclk	I2C clock
5	Gnd
6	Vlcd	6.4V from internal dc/dc convertor

pcf8558

* based on Philips PCF8558

Instruction format: control byte followed by column address

Instruction	D7	D6	D5	D4	D3	D2	D1	D0	Description
Display control byte:	Y2	Y1	Y0	0	0	0	0	0	Y address vector, blank mode
				0	1	0	0	1	Y address vector, normal mode
				0	1	1	0	1	Y address vector, all segments on mode
Column address:	0	X address							set column address

References and Additional Resources