LM12864LFW Graphical LCD 128x64 TOPWAY
Controller S6B0107/S6B0108
Internal Reference:
LM12864LFW
Product Description
The TOPWAY LM12864LFW is a 128 × 64 graphic LCD module designed for embedded electronic systems, industrial instruments, control panels, and microcontroller-based applications.
It features an STN (Super Twisted Nematic) negative transmissive LCD panel with a white LED backlight. The 128 × 64 pixel resolution allows developers to display text, symbols, icons, menus, and simple graphical information.
The module uses an 8-bit parallel data interface (DB0–DB7) with RS, R/W, E, CS1, CS2, and RESET control signals. Its display architecture incorporates separate driver sections for the left and right halves of the screen, each controlling 64 columns.
Operating from a 5V DC supply, the LM12864LFW is suitable for embedded systems and electronic equipment using conventional 5V logic. It also features an integrated voltage booster output for LCD contrast control, with an external variable resistor required to adjust the display contrast.
The module's compact 93 × 70mm outline, white LED backlight, and standard 20-pin connector make it suitable for integration into custom electronic products and equipment.
Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | TOPWAY |
| Model | LM12864LFW |
| Product Type | Graphic LCD Module |
| Display Technology | STN |
| Display Mode | Negative, Transmissive |
| Resolution | 128 × 64 pixels |
| Display Data = 1 | Light Gray |
| Display Data = 0 | Deep Blue (background) |
| Viewing Direction | 6H |
| Driving Duty | 1/64 duty |
| Bias Ratio | 1/9 bias |
| LCD Controller | S6B0107 / S6B0108 or equivalent |
| Data Interface | 8-bit Parallel |
| Data Bus | DB0–DB7 |
| Control Signals | RS, R/W, E, CS1, CS2, /RST |
| Operating Voltage | 4.8–5.2V DC |
| Typical Supply Voltage | 5.0V DC |
| Operating Current | 6.5mA typical, 15mA maximum |
| Backlight Type | White LED |
| Backlight LED Count | 4 LEDs |
| Backlight Forward Voltage | 4.9V typical |
| Backlight Forward Current | 68mA typical (at 5V, according to outline drawing); 120mA maximum in manual |
| Contrast Adjustment | External 25k–50kΩ variable resistor |
| Outline Dimensions | 93 × 70 × 13.8mm maximum |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Connector | 20-pin, 2.54mm pitch |
| Environmental Standard | RoHS |
Technical Information
1. Display Technology and Resolution
The LM12864LFW uses an STN negative transmissive LCD panel with 128 × 64 pixels.
Its display uses two data states:
- Display Data = 1: Light Gray.
- Display Data = 0: Deep Blue background.
This monochrome graphical display supports text, numbers, symbols, icons, menus, and simple graphical layouts.
| Display Parameter | Specification |
|---|---|
| LCD Technology | STN |
| Display Mode | Negative / Transmissive |
| Resolution | 128 × 64 pixels |
| Viewing Direction | 6H |
| Driving Duty | 1/64 |
| Bias Ratio | 1/9 |
| Backlight | White LED |
2. LCD Controller and Display Architecture
The module uses S6B0107 and S6B0108 controllers, or equivalent devices, to manage the display.
The architecture consists of two driver sections:
- Left section: 64 columns.
- Right section: 64 columns.
Each section has its own display memory and can be selected independently using CS1 and CS2.
The display memory is organized into eight pages, with each page containing 8 vertical pixels across 128 columns.
The controller supports:
- Display ON/OFF control.
- Page and column address selection.
- Display start-line control.
- Display data reading and writing.
- Reset and status reading.
- Independent selection of the left and right display sections.
3. 8-Bit Parallel Communication Interface
The LM12864LFW uses an 8-bit parallel data bus (DB0–DB7) for communication with an external microcontroller or host controller.
The main communication signals are:
| Signal | Function |
|---|---|
| DB0–DB7 | 8-bit parallel data bus |
| RS | Register Select: display data or instruction data |
| R/W | Read/Write control |
| E | Enable signal |
| CS1 | Selects the left 64-column section |
| CS2 | Selects the right 64-column section |
| /RST | LCD reset signal |
The module allows instructions to be written to both driver sections simultaneously. Display data can be written to the individual sections using the appropriate chip-select signal.
When reading data, only one driver section should be selected at a time to avoid data collisions.
4. Electrical Characteristics
The LCD logic operates from a 5V DC supply.
| Parameter | Minimum | Typical | Maximum |
|---|---|---|---|
| Operating Voltage | 4.8V | 5.0V | 5.2V |
| Operating Current | — | 6.5mA | 15mA |
| Backlight Forward Voltage | — | 4.9V | — |
| Backlight Forward Current | — | — | 120mA |
The logic operating current and LED backlight current are specified separately.
The outline drawing specifies a typical backlight current of 68mA at 5V. The manual specifies a maximum backlight forward current of 120mA. The backlight should be driven within the manufacturer's specified limits.
5. Contrast Adjustment
The LM12864LFW includes a voltage booster circuit with a VOUT terminal for generating the LCD contrast reference voltage.
An external variable resistor is required to adjust the V0 contrast reference.
The manufacturer recommends a variable resistor value between 25kΩ and 50kΩ.
Adjusting this resistor changes the LCD contrast and helps obtain the appropriate display appearance.
6. White LED Backlight
The module features a white LED backlight consisting of four LEDs, as shown in the mechanical outline drawing.
| Backlight Parameter | Specification |
|---|---|
| Backlight Color | White |
| Number of LEDs | 4 |
| Forward Voltage | 4.9V typical |
| Typical Current | 68mA at 5V (outline drawing) |
| Maximum Current | 120mA (manual) |
The backlight uses separate BLA and BLK terminals:
- BLA: Positive LED backlight supply.
- BLK: Negative LED backlight supply.
Use an appropriate current-limited driving circuit and do not exceed the specified maximum current.
7. Mechanical Dimensions
The module has a compact design suitable for installation in embedded electronic equipment.
| Parameter | Dimension |
|---|---|
| Overall Width | 93.0mm |
| Overall Height | 70.0mm |
| Maximum Thickness | 13.8mm |
| Active Display Width | Approximately 66.53mm |
| Active Display Height | Approximately 33.24mm |
| Resolution | 128 × 64 pixels |
| Connector | 20-pin |
| Connector Pitch | 2.54mm |
The outline drawing shows four mounting positions and a 20-pin connector along the lower edge of the module.
Refer to the supplied mechanical drawing for exact mounting-hole positions, PCB dimensions, active-area measurements, and connector layout.
Features
- 128 × 64 Graphic Resolution: Supports text, numbers, symbols, icons, and simple graphical interfaces.
- STN Negative Display: Transmissive monochrome LCD technology.
- White LED Backlight: Improves display visibility in low-light environments.
- 8-Bit Parallel Interface: Uses DB0–DB7 data signals.
- Dual Driver Architecture: Separate 64-column sections for left and right display areas.
- 5V Operation: Designed for conventional 5V embedded electronic systems.
- Adjustable Contrast: Supports external variable-resistor adjustment.
- Built-In Voltage Booster: Provides the LCD contrast reference voltage.
- Compact Design: 93 × 70mm outline dimensions.
- Wide Operating Temperature: Supports operation from -20°C to +70°C.
Applications
- Embedded electronic systems.
- Industrial control panels.
- Digital measurement instruments.
- Electronic testing equipment.
- Microcontroller-based projects.
- 5V embedded control systems.
- Instrumentation and monitoring devices.
- Electronic equipment displays.
- Custom graphical user interfaces.
- Industrial automation equipment.
Frequently Asked Questions (FAQ)
1. What is the resolution of the TOPWAY LM12864LFW?
The LM12864LFW features a graphic resolution of 128 × 64 pixels, suitable for displaying text, numbers, icons, symbols, and simple graphics.
2. Is the LM12864LFW a character LCD or a graphic LCD?
It is a graphic LCD module. It provides pixel-level control, allowing developers to create custom characters, icons, symbols, and graphical layouts.
3. What type of LCD technology does it use?
It uses STN (Super Twisted Nematic) negative transmissive LCD technology. The specified display data states are light gray and deep blue.
4. What is the operating voltage?
The specified operating voltage is 4.8–5.2V DC, with a typical supply voltage of 5V.
5. What communication interface does the LM12864LFW use?
It uses an 8-bit parallel interface with DB0–DB7 data signals and control signals including RS, R/W, E, CS1, and CS2.
6. Does the LM12864LFW include a backlight?
Yes. It features a white LED backlight consisting of four LEDs. The outline drawing specifies a typical current of 68mA at 5V, while the user manual specifies a maximum forward current of 120mA.
7. How can I adjust the display contrast?
An external variable resistor is required to provide the contrast reference voltage at V0. TOPWAY recommends a resistor value between 25kΩ and 50kΩ.
8. Is the LM12864LFW compatible with Arduino?
It can be interfaced with compatible microcontrollers through its 8-bit parallel data bus and control signals. The controller must provide the appropriate 5V logic signals and implement the display initialization and communication instructions.
Download
- LCD Datasheet
- For Arduino Code, please download this file (Click Here)