Home Products COG LCD WO240128B

Chip on Glass LCD Module 240x128

Model No. WO240128B

►Graphic LCD
►240 x 128 dots
►IC: ST7586S
►3.3V power supply
►1/128 duty cycle
►Interface : 6800/8080/SPI


WO240128B is a monochrome COG graphic LCD module made of 240x128 pixels, diagonal size 4.8 inch. This COG LCD Module WO240128B is built in with ST7586S controller IC; it supports 6800 8-bit, 8080 8-bit parallel and 3-line 9-bit /4-line 8-bit serial SPI interface. This COG WO240128B type is having the same Active Area dimension and View Area as COB WG240128B, but WO240128B is much thinner than WG240128B. If the customers require 4.8” thinner module for new design, the WO240128B is a good choice.

This WO240128B module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃. The WO240128B is available for different LCD mode options; STN Negative blue with white LED backlight, and FSTN positive white with white LED backlight. Please contact with us if you need different LCD type and LED combination.


Chip on Glass  LCD Module 240x128 - WO240128B
Data source ref:WO240128B-TFH#


Interface Pin Function

Pin No. Symbol Description
1 ESD GND Electro-Static discharge
2 VG VG is the power of SEG-drivers
3 XV0 Negative operating voltage of COM-drivers
4 V0 Positive operating voltage of COM-drivers
5 VM VM is the non-select voltage level of COM-drivers.
6 VDDA Power supply
7 VSS Ground
8 VD1 Digital power source selection.
9 VDDI VDD1 is the power of interface I/O circuit
10 CSB Chip select input pin
CSB=“L”: This chip is selected and the MPU interface is active
CSB=“H”: This chip is not selected and the MPU interface is disabled
(D[7:0] are high impedance)
11 IF3 These pins select interface operation mode.
IF3 IF2 IF1 MPU interface type
H H L 80 series 8-bit parallel
H L L 68 series 8-bit parallel
L H H 8-bit serial (4-Line)
L H L 9-bit serial (3-Line)
12 IF2
13 IF1
14 RSTB Reset input pin. When RSTB is “L”, internal initialization procedure is executed.
15 /RD(E) Read / Write execution control pin. (This pin is only used in parallel interface)
MPU Type ERD Descriptin
6800-series ERD Read/Write control input pin
R/W = "H" When E is "H", data bus is in output status.
R/W = "L" The data are lunched at the failling edge of the E signal.
8080-series /RD Read enable inputpin.
When /RD is "L". Data bus is in output status.
16~23 D7~D0 The bi-directional data bus of the MPU interface. When CSB is “H”, they are high impedance.
If using serial interface:
D0 is the SDA signal in 4-Line & 3-Line interface.
D1 is the A0 signal in 4-Line interface
24 /WR/(R/W) Read / Write execution control pin. (This pin is only used in parallel interface
MPU Type RWR Descriptin
6800-series R/W Read/Write control input pin
R/W = "H" : Read
R/W = "L" : write
8080-series /WR Write enable clock input pin.
The data are layched at the rising edge of the /WR signal.
This pin is not used in serial interfaces and should be connected to VDD1
25 A0(SCL) The function of this pin is different in parallel and serial interface
In parallel interface: A0 is register selection input
A0 = "H": inputs on data bus are display data
A0 = "L": inputs on data bus are command
In serial interface: this pad will be used as SCL (serial-clock) input
26 ESD GND Electro-Static discharge

Mechanical Data

Item Dimension Unit
Number of dots 240 x 128
Module dimension 122.2 x 79.8 x 6.5 (MAX) mm
View area 114.0 x 64.0 mm
Active area 107.98 x 57.58 mm
Dot size 0.43 x 0.43 mm
Dot pitch 0.45 x 0.45 mm
Duty 1/128D,1/12B
Backlight Type LED
IC ST7586S
Interface 6800/8080/3-Line/4-Line

Absolute Maximum Ratings

Item Symbol Min Typ Max Unit
Operating Temperature TOP -20 +70
Storage Temperature TST -30 +80
Digital Power Supply Voltage VDDI -0.3 3.6 V
Analog Power supply voltage VDDA -0.3 3.6 V
LCD Power supply voltage V0-XV0 -0.3 19 V
LCD Power supply voltage VG -0.3 5.5 V

Electrical Characteristics

Item Symbol Condition Min Typ Max Unit
Supply Voltage For Logic VDD-VSS 3.0 3.3 3.6 V
Supply Voltage For LCM V0-V0 Ta=-20℃



Input High Volt. VIH 0.7VDD VDD V
Input Low Volt. VIL VSS 0.3VDD V
Output High Volt. VOH 0.8VDD VDD V
Output Low Volt. VOL VSS 0.2VDD V

Supply Current(No include LED Backlight)

IDD VDD=3.3V 2.0 4.0 mA

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