COG LCD Modules (Chip-on-Glass)

Chip-on-Glass LCD technology integrates the driver IC directly onto the panel — eliminating the PCB and delivering the thinnest possible display module profile.

Product Overview

COG (Chip-on-Glass) is a display packaging technology where the driver integrated circuit is bonded directly onto the glass substrate of the LCD panel using ACF (Anisotropic Conductive Film) adhesive. By eliminating the separate driver PCB found in conventional LCD modules, COG displays achieve significantly thinner profiles, lighter weight, and smaller footprints — making them the preferred choice for compact, portable, and wearable product designs.

Relialink's COG LCD modules are available in graphic and numeric segment configurations, with SPI and I2C interfaces for straightforward connection to any microcontroller. Common sizes range from 1.8" to 3.2" diagonal, with standard resolutions including 96x64, 128x64, and 132x64. Both positive (dark pixels on light background) and negative (light pixels on dark background) display modes are available depending on backlight color selection.

The thin cross-section and minimal component count make COG modules attractive not only for wearables and portable instruments but also for any product design where PCB space is at a premium and display depth must be minimized.

Key Features

Ultra-Thin Profile

Typically less than 3mm total module thickness — significantly thinner than conventional LCD modules with separate driver PCB.

Lightweight Design

Eliminating the separate PCB reduces component count and overall weight — critical for wearable and portable products.

SPI and I2C Interfaces

Simple 3-4 wire interfaces minimize MCU pin usage and simplify PCB routing.

Positive and Negative Modes

Both positive (dark on light) and negative (light on dark) display modes available depending on backlight selection.

Low Component Count

Minimal external components required — driver IC is bonded directly to the glass, reducing BOM complexity.

Optional LED Backlight

Available in various colors — white, blue, yellow-green, and amber for different aesthetic requirements.

Specifications

Technology	Chip-on-Glass (COG)
Size Range	1.8" to 3.2" typical
Resolution	96x64, 128x64, 132x64, 128x128
Interface	SPI (3/4-wire), I2C
Controller IC	ST7567, UC1701, ST7565, NT7538
Display Mode	Positive / Negative
Backlight	Optional LED (various colors)
Module Thickness	Typically < 3mm
Operating Temperature	-20°C to +70°C (standard)
Supply Voltage	3.3V
Compliance	RoHS

Applications

Wearable Devices

Smartwatch accessories, fitness bands, and health monitoring wearables benefit from COG's ultra-thin profile and light weight.

Handheld Instruments

Portable test equipment, handheld multimeters, and field instruments use COG modules for compact, rugged display integration.

Smart Meters

Electricity, water, and gas meters use COG displays for reliable numeric readout with minimal power consumption.

Medical Wearables

Portable patient monitors, insulin pumps, and health tracking devices use COG displays for compact, low-power operation.

Remote Controls

Universal remote controls and smart home controllers use COG modules for clear status display in a slim form factor.

Portable Audio Equipment

Digital audio players, headphone amplifiers, and recording equipment use COG displays for compact GUI integration.

Related Products

Graphic LCD Displays OLED Display Modules Segment LCD Displays

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Contact our sales team to discuss your COG LCD requirements. Standard and custom configurations available.

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