JHD629-204A 20x4 Character LCD Display

The JHD629-204A LCD Display is a 20x4 character LCD module designed for embedded electronics, industrial control panels, instrumentation, automation equipment, and microcontroller-based applications. It provides 4 rows with 20 characters per row, allowing up to 80 characters to be displayed at once. The module is based on a standard character LCD interface and can be operated using either 4-bit or 8-bit parallel communication.

The JHD629-204A is commonly available with a yellow-green STN display and yellow-green LED backlight. It operates from a 5V power supply and uses an SPLC780D controller, which is compatible with the widely used HD44780-style character LCD interface.

Its simple parallel interface makes the display suitable for integration with microcontrollers such as Arduino, STM32, PIC, and AVR, as well as custom embedded control systems.

Key Features

·        Brand: JHD

·        Model: JHD629-204A

·        Display Type: Character LCD

·        Display Format: 20 × 4 characters

·        Total Characters: 80

·        LCD Type: STN

·        Display Colour: Yellow Green

·        Backlight: Yellow Green LED

·        Controller: SPLC780D

·        Interface: Parallel

·        Communication: 4-bit / 8-bit

·        Operating Voltage: 5V

·        Viewing Angle: 6H to 12H

·        Display Area: 76.0 × 25.2 mm

·        Character Size: 2.95 × 4.75 mm

·        Module Dimensions: 98.0 × 60.0 × 14.0 mm

·        Driver Duty: 1/16

·        Touch Screen: No

Technical Specifications

The above specifications are based on available JHD629-204A product specifications.

20x4 Character LCD Display

The JHD629-204A provides a 20-column by 4-row character format, giving the system the ability to display 80 characters simultaneously. This makes it suitable for applications that need more information on screen than a standard 16x2 character LCD.

The display can be used for numerical values, text messages, equipment status, sensor readings, menu options, measurement values, and other alphanumeric information.

STN Yellow-Green LCD

The module uses an STN yellow-green LCD with a matching yellow-green LED backlight. This traditional character LCD configuration provides clear characters against the illuminated background and is commonly used in embedded control and instrumentation applications.

The display supports a viewing angle specified from approximately 6H to 12H, making the orientation of the module an important consideration when designing the enclosure or control panel.

SPLC780D Controller

The JHD629-204A uses an SPLC780D controller, providing a standard character LCD control interface. This allows the module to be integrated with a wide range of microcontrollers and embedded control boards.

The controller supports standard parallel communication, allowing the display to operate in either 4-bit or 8-bit mode. In 4-bit mode, fewer microcontroller I/O pins are required, which can be useful when working with boards that have limited available GPIO pins.

5V Parallel Interface

The JHD629-204A operates from a 5V power supply and uses a parallel interface. The standard connections include power, contrast adjustment, register select, read/write control, enable, and data lines.

The module can therefore be integrated into embedded systems using common microcontroller platforms without requiring a specialized display interface.

LED Backlight

The JHD629-204A features a yellow-green LED backlight designed to improve character visibility. The backlight can be controlled as part of the display circuit and can be dimmed using appropriate current-limiting or PWM techniques depending on the implementation.

Compact Module Dimensions

The module measures approximately 98.0 × 60.0 × 14.0 mm, with a visible display area of approximately 76.0 × 25.2 mm. Individual characters measure approximately 2.95 × 4.75 mm.

These dimensions make the JHD629-204A suitable for control panels, instrument enclosures, embedded electronics, and other applications where a compact alphanumeric display is required.

Embedded and Industrial Applications

The JHD629-204A can be integrated into a wide range of electronic and control applications.

Typical applications include:

·        Industrial control panels

·        Automation equipment

·        Embedded systems

·        Microcontroller projects

·        Arduino projects

·        STM32 systems

·        PIC-based systems

·        AVR-based systems

·        Instrumentation equipment

·        Measurement systems

·        Data display units

·        Machine control panels

·        Elevator control systems

·        Digital meters

·        Temperature monitoring systems

·        Process monitoring equipment

·        Equipment status displays

·        Electronic control systems

·        OEM control interfaces

Its 20x4 format is particularly useful where the application needs to display multiple lines of information simultaneously.

Compatibility and Replacement Note

The JHD629-204A is suitable for applications requiring a standard 20x4 parallel character LCD. Before replacing an existing display, verify the following:

·        Exact LCD model

·        Display format

·        Module dimensions

·        Display area

·        Character dimensions

·        Connector/pin configuration

·        Supply voltage

·        Backlight configuration

·        Controller compatibility

·        Mounting arrangement

·        Viewing orientation

Although many 20x4 character LCD modules use similar interfaces, connector arrangements, backlight configurations, dimensions, and controller implementations can vary. Confirm the specifications before installation.

Product Details

Product: JHD629-204A LCD Display
Brand: JHD
Model: JHD629-204A
Display Format: 20 × 4 Characters
LCD Type: STN
Display Colour: Yellow Green
Backlight: Yellow Green LED
Controller: SPLC780D
Interface: Parallel
Communication: 4-bit / 8-bit
Operating Voltage: 5V
Viewing Angle: 6H to 12H
Display Area: 76.0 × 25.2 mm
Character Size: 2.95 × 4.75 mm
Module Dimensions: 98.0 × 60.0 × 14.0 mm
Driver Duty: 1/16
Touch Screen: No

Handling and Installation Precautions

·        Handle the LCD module carefully during installation.

·        Do not apply excessive pressure to the display glass.

·        Avoid scratching the display surface.

·        Verify the pin configuration before connecting power.

·        Use the specified 5V supply.

·        Do not reverse the power connections.

·        Avoid short circuits on the backlight and power pins.

·        Protect the module from excessive moisture.

·        Follow appropriate ESD precautions during handling.

·        Ensure proper contrast voltage adjustment before operation.

Frequently Asked Questions

What is the JHD629-204A?

The JHD629-204A is a 20x4 character LCD module with four rows and 20 characters per row. It uses an STN LCD and is designed for embedded and electronic control applications.

How many characters can the JHD629-204A display?

The display can show 20 characters across 4 rows, allowing a total of 80 characters to be displayed simultaneously.

What controller does the JHD629-204A use?

The JHD629-204A uses an SPLC780D controller, which provides a standard character LCD interface.

What is the operating voltage of JHD629-204A?

The module operates from a 5V power supply.

What type of backlight does JHD629-204A use?

The JHD629-204A uses a yellow-green LED backlight.

Does JHD629-204A support 4-bit and 8-bit communication?

Yes. The display supports both 4-bit and 8-bit parallel interfaces, allowing it to be connected to microcontrollers using different numbers of GPIO pins.

What are the dimensions of JHD629-204A?

The module dimensions are approximately 98.0 × 60.0 × 14.0 mm, with a display area of approximately 76.0 × 25.2 mm.

What is the character size of JHD629-204A?

The specified character size is approximately 2.95 × 4.75 mm.

Can JHD629-204A be used with Arduino?

Yes. The JHD629-204A's standard parallel character LCD interface makes it suitable for integration with Arduino and other microcontroller platforms.

Does JHD629-204A have a touch screen?

No. The JHD629-204A is a character LCD module without an integrated touch screen.

What applications use JHD629-204A?

The display can be used in industrial control panels, automation equipment, instrumentation, embedded systems, data display units, machine interfaces, and microcontroller-based projects.

Can JHD629-204A be used as a replacement LCD?

Yes, provided the replacement application matches its 20x4 character format, dimensions, interface, pin configuration, 5V supply, controller requirements, and backlight configuration.