20x4 Character LCD STN Transmissive Large - MCU
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20x4 Character LCD STN Transmissive Large - 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
Resources & Downloads
20×4 Character LCD STN Transmissive Large - MCU
DM-LCD2004-445 is a 20 characters × 4 lines character LCD module with ST7066U controller IC, 6800 Series MPU interface, 5.0 V typical logic supply, and an 18-pin parallel interface layout. It is intended for text-based display integration in control panels, instruments, embedded equipment, and other MCU-driven products.
This content uses the provided DM-LCD2004-445 engineering drawing and official datasheets as the technical reference. The image is the mechanical drawing for the module outline, viewing area, active area, pin pitch, and side depth reference.
Verified Technical Specifications
The table below keeps to values provided in the product page, the DM-LCD2004-445 datasheet, and the supplied engineering drawing.
For final production use, confirm the exact SKU, display color, and datasheet revision before PCB layout, backlight circuit design, and enclosure release.
| Parameter | Specification |
|---|---|
| Product Name | 20×4 Character LCD STN Transmissive Large - MCU |
| Primary SKU | DM-LCD2004-445 |
| Character Format | 20 characters × 4 lines |
| Display Mode | STN Positive, Yellow Green, Transmissive |
| Module Dimension | 146.0±0.5 × 62.5±0.5 × 13.6 mm max. |
| Viewing Area | 123.5 × 43.0 mm |
| Active Area | 118.84 × 38.47 mm |
| Controller IC | ST7066U |
| Interface | 6800 Series MPU Interface |
| Pin Layout | 18-position interface area, 2.54 mm pitch shown in the mechanical drawing |
| Logic Supply Voltage | 4.5 V min., 5.0 V typ., 5.5 V max. |
| Supply Current | 1.0 mA min., 1.2 mA typ., 1.5 mA max. at VDD=5.0 V |
| Backlight | Yellow Green LED |
| View Direction | 6:00 |
| Duty | 1/16 |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Weight | 116.6 g |
| Touch Panel | No touch panel or touch controller IC is specified in the provided DM-LCD2004-445 datasheet. Confirm any touch-related requirement with DisplayModule before ordering. |
Mechanical Drawing Review
The supplied engineering drawing confirms the main layout values used for enclosure design, window opening, pin-header positioning, and clearance review.
Use these values together with the datasheet when planning mounting holes, bezel overlap, PCB clearance, and backlight-side space.
| Drawing Item | Value |
|---|---|
| Overall Width | 146.0±0.5 mm |
| Overall Height | 62.5±0.5 mm |
| Maximum Thickness | 13.6 mm max. |
| Viewing Area | 123.5 × 43.0 mm |
| Active Area | 118.84 × 38.47 mm |
| Pin Area | 18 positions, 2.54 mm pitch |
| Pin Hole Reference | 18-Ø1.0 PTH shown in the drawing |
| LED Backlight Side | LED B/L side depth is shown in the side-view drawing |
Electrical and Optical Data
The values below support early circuit design, backlight-driver review, contrast adjustment planning, and display visibility evaluation for the DM-LCD2004-445 version.
| Item | Specification |
|---|---|
| Logic Supply Voltage | 4.5 V min., 5.0 V typ., 5.5 V max. |
| Supply Current | 1.0 mA min., 1.2 mA typ., 1.5 mA max. at VDD=5.0 V |
| Backlight Forward Voltage | 4.0 V min., 4.2 V typ., 4.4 V max. |
| Backlight Forward Current | 432 mA min., 540 mA typ., 648 mA max. |
| Contrast Ratio | 3 |
| Luminance without LCD | 140 cd/m² min., 190 cd/m² typ. |
| Response Time | Tr + Tf: 300 ms typ., 400 ms max. at 25°C |
| Viewing Angle | Top 20°, bottom 40°, left 30°, right 30° |
Connector and Interface Details
The module uses an 18-pin interface assignment. Pins 7 to 14 provide DB0 to DB7 data bus lines. The ST7066U instruction description supports 8-bit bus mode when DL is high and 4-bit bus mode when DL is low.
Available Color Variants in the Product Family
The product family includes multiple color/display-mode options with separate datasheets. The values below are included for comparison only. Confirm the exact SKU before ordering because backlight current, luminance, viewing angle, contrast ratio, and weight are not identical across variants.
DM-LCD2004-445
- STN Positive, Yellow Green, Transmissive
- Yellow Green LED backlight
- Contrast ratio: 3
- Luminance without LCD: 140 cd/m² min., 190 cd/m² typ.
- Weight: 116.6 g
DM-LCD2004-446
- FSTN Positive, Transflective
- White LED backlight
- Contrast ratio: 5
- Luminance without LCD: 450 cd/m² min., 550 cd/m² typ.
- Weight: 122.1 g
DM-LCD2004-447
- STN Negative, Blue, Transmissive
- White LED backlight
- Contrast ratio: 3
- Luminance without LCD: 450 cd/m² min., 550 cd/m² typ.
- Weight: 121.7 g
ST7066U Controller and Interface Timing
Controller Notes
The provided ST7066U controller IC document identifies it as a dot-matrix LCD controller/driver for alphanumeric, Japanese kana, and symbol display under 4-bit or 8-bit microprocessor control.
Timing Values for Review
| Timing Item | Value |
|---|---|
| Enable Cycle Time | 1200 ns min. |
| Enable Pulse Width | 140 ns min. |
| Enable Rise/Fall Time | 25 ns max. |
| Address Setup Time | 0 ns min. |
| Address Hold Time | 10 ns min. |
| Write Data Setup Time | 40 ns min. |
| Data Hold Time | 10 ns min. |
| Read Data Setup Time | 100 ns max. |
Reliability and Operating Conditions
These test conditions help customers review environmental tolerance before sample evaluation and product design. Final suitability depends on the customer application, enclosure, drive conditions, assembly process, and acceptance criteria.
Storage
High temperature storage: 80°C for 200 hours. Low temperature storage: -30°C for 200 hours.
Operation
High temperature operation: 70°C for 200 hours. Low temperature operation: -20°C for 200 hours.
Humidity and Shock
60°C, 90%RH max. for 96 hours under no-load condition excluding the polarizer. Thermal shock: -20°C/+70°C for 10 cycles.
Vibration and ESD
Vibration: 1.5 mm total fixed amplitude, 10-55 Hz, X/Y/Z directions. Static electricity: VS=800 V, RS=1.5 kΩ, CS=100 pF, 1 time.
Engineering Notes Before Ordering
FAQ for Product Evaluation
Which datasheet should be used?
Use DM-LCD2004-445 for the yellow-green version. If selecting gray or blue options, review DM-LCD2004-446 or DM-LCD2004-447.
Does it use a parallel MCU interface?
Yes. The datasheet lists a 6800 Series MPU interface with RS, R/W, E, and DB0 to DB7 data bus lines.
Is this a 5 V logic display?
The logic supply voltage is 4.5 V min., 5.0 V typ., and 5.5 V max. Review MCU I/O and timing before finalizing the circuit.
Are optical values the same for all colors?
No. Datasheets list different view angles, contrast ratios, luminance values, backlight values, and weights for different variants.
Does it include touch?
No touch panel or touch controller IC is specified in the provided DM-LCD2004 datasheets.
What should be checked before layout?
Review outline, viewing area, active area, pin pitch, backlight values, VO adjustment, interface timing, and operating conditions.
Download Official Datasheet
Use the official datasheets to confirm dimensions, display mode, interface pins, electrical values, optical values, timing requirements, mechanical drawing, reliability conditions, and controller information before design release.