Home Products Character LCD WH2004L

20x4 LCD Module, Character LCD Display 20x4

Model No. WH2004L

►STN LCD Module, STN Display, STN LCD Ddisplay, LCD STN
►LCD Character Displays 20x4
►5x8 dots includes cursor
►+5V power supply (Also available for +3V)
►Negative voltage optional for +3V power supply
►1/16 duty cycle
►LED can be driven by PIN1, PIN2, PIN15, PIN16 or A and K
►Interface: 6800 (ST7066 IC or Equivalent), option SPI/I2C (RW1063 IC)


WH2004L is 20 characters by 4 lines LCD display module which is built in with ST7066 controller IC; its default interface is 6800 4/8-bit parallel.  These 20x4 LCD modules are also available in SPI and I2C interface by using RW1063 controller IC. This type of LCD Display 20x4 Module can be operating at temperatures from -20℃ to +70℃; its storage temperatures range from -30℃ to +80℃.  WH2004L is available in several different backlight colors including blue, green, yellow-green, amber, red and white LEDs. The LEDs can be driven by pin 1, pin 2, or pin 15 pin 16 or A/K.  There are different character fonts/texts available for ST7066 IC including English/Japanese, English/West European, English/Scandinavian European, or English/Cyrillic (Russian) as options.

There are different interface options for WH2004L series, details as below:
►WH2004L : 6800 interface (ST7066 IC)
►WH2004L1 : SPI interface (RW1063 IC)
►WH2004L2 : I2C interface (RW1063 IC)


STN LCD Module, STN Display, STN LCD Display, LCD STN 20x4 - WH2004L


Interface Pin Function

Pin No. Symbol Description
1 VSS Ground
2 VDD Power supply for logic
3 VO Contrast Adjustment
4 RS Data/ Instruction select signal
5 R/W Read/Write select signal
6 E Enable signal
7~14 DB0~DB7 Data bus line
15 A Power supply for B/L +
16 K Power supply for B/L -
17 NC No connection
18 NC No connection

Mechanical Data

Item Standard Value Unit
Module Dimension 146.0 × 62.5 mm
Viewing Area 123.5 × 43.0 mm
Mounting Hole 139.0 × 55.5 mm
Character Size 4.84 × 9.22 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 4.20 V

Display Character Address Code

Display Position 1 2 3 4 5 6 7 8 9 10 11 12 13 --- --- 20
DD RAM Address 00 01                           13
DD RAM Address 40 41                           53
DD RAM Address 14 15                           27
DD RAM Address 54 55                           67

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