Home Products Character LCD WH4004A

40x4 Character LCD Display, Display LCD 40x4

Model No. WH4004A

►Character Display LCD 40x4
►5x8 dots includes cursor
►Bulit-in controller (ST7066 or Equivalent)
►+5V power supply ( Also available for +3V)
►Negative voltage optional for +3V power supply
►1/16 duty cycle
►Interface: 6800
►LED can be driven by PIN1, PIN2, PIN17, PIN18 or A and K


WH4004A is 40x4 Character LCD display module which is built in with ST7066 controller IC; its default interface is 6800 4/8-bit parallel and 5V or 3.3V power supply option. This 40x4 LCD display WH4004A is available for no backlight or with LED backlight options. This LCD display 40x4 is available in various LCD panel colors including gray, yellow/green and blue LCD options. This display LCD 40x4 module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃, its built in character set supports English/Japanese, English/West European, English/Scandinavian European, or English/Cyrillic (Russian) options.


WH4004A - 40x4 Character LCD Display, LCD Display 40x4, Winstar Display LCD 40x4


40x4 Character LCD Datasheet

Interface Pin Function

Pin No. Symbol Description
1~8 DB7~DB0 Data bus line
9 E1 Enable signal
10 R/W Read/Write select signal
11 RS Data/ Instruction  select signal
12 VO Contrast Adjustment
13 VSS Ground
14 VDD Power supply for logic
15 E2 Enable signal
16 NC No connection
17 A Power supply for B/L +
18 K Power supply for B/L -

Mechanical Data

Item Standard Value Unit
Module Dimension 190.0 × 54.0 mm
Viewing Area 147.0 × 29.5 mm
Mounting Hole 183.0 × 47.0 mm
Character Size 2.78 × 4.89 mm

Electrical Characteristics

Item Symbol Standard Value
Input Voltage VDD 3/5 V
Recmmended LCD Driving
Voltage for Normal Temp.
Version module @25°C
VDD-VO 4.35 V

Display Character Address Code

Display Position 1 2 3 4 5 6 7 8 9 10 11 12 --- --- --- 40  
DD RAM Address 00 1                           27 Lin1
DD RAM Address 40 41                           67 Lin2
DD RAM Address 00 01                           27 Lin3
DD RAM Address 40 41                           67 Lin4

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