20x4 Character LCD STN Transflective - MCU
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- 📉 A 15% discount is available for orders ranging from 200 to 499
- 🎁 A 10% discount is available for orders ranging from 50 to 199
- 🎁 A 5% discount is available when ordering 10-49
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20x4 Character LCD STN Transflective - MCU
- 💹 Enjoy a 20% discount for orders over 500
- 📉 A 15% discount is available for orders ranging from 200 to 499
- 🎁 A 10% discount is available for orders ranging from 50 to 199
- 🎁 A 5% discount is available when ordering 10-49
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20x4 Character LCD STN Transflective Display Module with MCU Interface
DM-LCD2004-442 is a 20 characters × 4 lines character LCD module using STN positive yellow-green transflective display technology. It is intended for embedded equipment panels that require text display, a 5V module supply, and a 6800 series MPU interface.
The module uses an ST7066U controller IC. The product information lists 8-bit and 4-bit MPU interface mode support, allowing the host design to select a wider data bus or a reduced-pin connection after timing and firmware review.
Verified Technical Specifications
The parameters below are organized for engineering review, purchasing comparison, mechanical planning, and sample evaluation. Confirm the selected color option and latest documentation before ordering.
| Parameter | Specification |
|---|---|
| Product Model | DM-LCD2004-442 |
| Product Type | 20x4 character LCD module |
| Display Format | 20 characters × 4 lines |
| Display Mode | STN Positive, Yellow Green, Transflective |
| Module Dimension | 98.0 × 60.0 × 13.6(MAX) mm |
| View Direction | 6:00 |
| Power Supply | 5.0V, operating range 4.5V to 5.5V |
| Backlight | Yellow Green LED |
| Interface | 6800 Series MPU Interface |
| Interface Mode | 8-bit and 4-bit MPU interface modes listed on the product page |
| Controller IC | ST7066U |
| Duty / Bias | 1/16 duty cycle, 1/5 bias ratio |
| Contrast Ratio | 3:1 typical |
| Response Time | 300–400 ms |
| Logic Current | 1.2 mA typical |
| Backlight Current | 280 mA at 4.2V |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Weight | 69.6 g |
Optical and Display Review
The transflective LCD structure is suitable for projects that need visibility review under ambient light and backlight-assisted conditions. Final readability depends on the enclosure, cover material, contrast setting, viewing angle, and lighting environment.
The listed 6:00 view direction should be compared with the final mounting position. For operator panels, handheld instruments, and equipment interfaces, verify the real viewing posture during sample testing.
Character Display Format
20 characters × 4 lines provides more text capacity than common 16x2 character LCD modules for menus, status lines, and measurement labels.
Contrast and Response
The page-listed values are 3:1 typical contrast ratio and 300–400 ms response time. Review these values for static text display applications.
Duty and Bias
The module information lists 1/16 duty and 1/5 bias. These values should be reviewed together with contrast adjustment and LCD driving behavior.
Backlight Current
The yellow-green LED backlight current is listed as 280 mA at 4.2V. Check the driver capacity and power budget during system design.
Controller and Interface Notes
The module uses an ST7066U controller IC and a 6800 series MPU interface. Use the official controller documentation to confirm initialization sequence, timing requirements, command behavior, and 4-bit or 8-bit interface configuration.
Confirm host logic compatibility, available GPIO count, and firmware timing before selecting 4-bit or 8-bit operation.
Review the interface pins, control signals, and timing details against the official datasheet and host-board schematic.
Set the VO pin correctly during bring-up. Incorrect contrast adjustment can make characters difficult to read.
Validate display readability, backlight current, and operating temperature behavior in the final enclosure.
Electrical and Operating Conditions
Use the following values for early system review. Final suitability should be confirmed with samples under the real enclosure, cable, power, and ambient-light conditions of the end product.
Project Fit Checklist
Use this checklist before sample approval, PCB release, and purchasing confirmation.
Industrial Control Panels
Evaluate for machine status panels, process displays, and equipment interfaces where text readability is required.
Test and Measurement
Can be evaluated for data loggers, calibration tools, laboratory instruments, and equipment that displays stable text or numeric values.
Embedded Equipment
Use in host systems that can provide the required 5V supply, MCU bus signals, and module mounting space.
Portable Instruments
Evaluate logic current, backlight current, ambient-light readability, and operating temperature range against the final use case.
Engineering Notes Before Ordering
These review points help reduce integration risk before firmware, PCB layout, enclosure design, and purchasing decisions are finalized.
Power and Backlight
Confirm the 5V module supply, backlight drive method, and current budget. Include the listed backlight current in power planning.
Firmware Bring-Up
Review ST7066U initialization, selected interface mode, and timing margins using the official controller documentation.
Contrast Setting
Plan VO contrast adjustment and validate readability under expected temperature and lighting conditions.
Mechanical Envelope
Use the 98.0 × 60.0 × 13.6(MAX) mm module dimension together with the drawing when checking enclosure clearance.
Variant Selection
Confirm the exact display appearance, documentation, and selected model if evaluating alternative model specifications.
Production Release
Confirm sample availability, bulk lead time, price tier, and lifecycle status with DisplayModule before production ordering.
FAQ for Engineering and Purchasing Teams
The answers below support early selection review. For production projects, confirm the latest datasheet, selected variant, and order conditions before release.
Is this module designed for graphics?
No. This is a 20 characters × 4 lines character LCD module for text, numbers, symbols, menus, and equipment status information.
Which controller IC is used?
The product specification lists ST7066U. Use the official controller document below for controller-level implementation details.
What supply voltage should be used?
The module specification lists 5.0V power supply with a 4.5V to 5.5V range. Check host-board power tolerance and backlight drive separately.
What temperature range is listed?
The operating temperature is listed as -20°C to +70°C, and the storage temperature is listed as -30°C to +80°C.
Can it be used in ambient light?
The module is listed as transflective, so it can be evaluated for ambient-light readability. Final suitability depends on enclosure, cover material, viewing angle, contrast setting, and lighting conditions.
Can the exact model be customized?
The product page lists customization options such as backlight options, modified viewing angles, bulk order programs, and extended temperature versions. Confirm the scope before ordering.
Engineering Files and Official Documentation
Download the official product datasheet, alternative model specification, and ST7066U controller documentation to confirm dimensions, electrical requirements, interface behavior, controller functions, and integration notes before sample evaluation or production ordering.