Description
I. Product Detailed Introduction
This high-quality monochrome dot-matrix COG LCD Module, model HTG12864-133-3SW-10C10-V01 from HOTHMI, is manufactured using advanced COG (Chip-on-Glass) packaging technology. It features a FSTN semi-transmissive positive display mode with a resolution of 128×64 pixels, a 6 o’clock viewing angle, and a 1/64 duty cycle with 1/9 bias driving scheme. The module is equipped with a high-brightness white LED backlight. Its compact outer dimensions are only 40.8×33.1×4.15mm, making it highly space-efficient and easy to integrate. Built around the ST7567 controller driver IC, it supports both 4-wire SPI serial interface and parallel bus communication, with a typical operating voltage of 3.3V.
Additionally, it boasts strong environmental resilience, with an operating temperature range from -30℃ to +80℃ and a storage temperature range from -40℃ to +90℃. It delivers clear display quality, excellent contrast, low power consumption, and high stability, positioning it as an ideal display solution for industrial controls, smart instruments, and similar applications.
II. Core Technology Highlights
As a premier COG LCD Module, this product stands out by directly addressing common pain points in industrial environments:
- Ultra-thin profile and high integration: The COG process eliminates bulky external driver boards and messy flying leads, reducing module thickness to just 4.15mm while significantly lowering hardware failure rates caused by solder joint loosening from prolonged vibration.
- All-weather visibility under strong light: The semi-transmissive polarizer technology gives the screen “dual-mode visibility.” In bright outdoor sunlight, it reflects ambient light as its illumination source, becoming clearer as light intensifies; in dim or nighttime conditions, the white LED backlight can be activated. This design perfectly avoids the washout effect of pure transmissive screens in sunlight and the unreadability of pure reflective screens at night.
- Excellent low-temperature overload tolerance: Traditional consumer-grade LCDs often suffer from severe ghosting or complete failure below freezing. This COG LCD Module supports operation down to -30℃ in cold regions, with the ST7567’s temperature compensation mechanism and built-in oscillator ensuring uninterrupted data refresh.
- Flexible 4-wire SPI and parallel communication: The module offers versatile bus options. For systems with limited I/O pins, the 4-line SPI mode is recommended, requiring only a few pins to fully control the display; for speed-critical applications, it also supports traditional 8080/6800 8-bit parallel buses.
III. Pin Function Description
This COG LCD Module connects to the main control board via a highly reliable 10-pin gold-finger FPC flexible circuit for electrical interconnection at the terminal.
IV. Industry and Product Application Scenarios
Thanks to its industrial-grade wide-temperature design and robust anti-interference architecture, this 12864 COG LCD Module is widely adopted in various space- and power-sensitive industries:
- Power and grid-connected smart instruments: Single-phase/three-phase smart meters, digital multimeters, power quality analyzers, industrial data concentrators.
- Smart factories and automation control: PLC programmable controller HMIs, CNC machine parameter panels, temperature controllers, inverter status displays.
- Handheld portable testing devices: Infrared thermometers, toxic gas detectors, handheld vibration testers, field GPS geological survey instruments.
- Medical and health monitoring terminals: Portable electronic blood pressure monitors, blood glucose meter displays, handheld pulse oximeters, physiotherapy equipment control panels.
- Commercial IoT terminals: Warehouse barcode scanners (PDAs), smart electronic scales, EV charger status indicators, card-based access control terminals.
V. Technical FAQ for COG LCD Module
Q1: In 4-wire SPI mode, can the microcontroller only perform write operations on the COG LCD Module?
A1: Yes. According to the built-in Sitronix ST7567 controller chip specification, when configured in 4-wire serial SPI mode, the data line (SDA) supports only write-only instruction and display dot-matrix data transfers. This means the host side cannot read the internal display RAM (DDRAM) status via SPI. If your project requires frequent “read-back” of display memory, you must switch to the traditional 8080 or 6800 8-bit parallel bus architecture.
Q2: What behavior can be expected when the module operates in extremely low temperatures (e.g., below -20℃), and what precautions should be taken?
A2: This COG LCD Module module has passed industrial wide-temperature tests down to -30℃ and will not suffer structural damage. However, in extreme cold, due to increased viscosity of the liquid crystal molecules, the physical response time will exhibit normal delays, visually appearing as slight ghosting during dynamic refresh, and the background color may darken somewhat due to higher bias voltage. This is a common characteristic of physical liquid crystal materials. Once the ambient temperature returns to normal, the display will fully recover automatically, with no hardware failure concerns.
