FAQ
What is a COG LCD Display?
A COG LCD Display is a monochrome LCD module in which the driver IC is bonded directly onto the LCD glass. The module may also include FPC, PIN connection, polarizer, optional LED backlight and mechanical support.
Is COG LCD a display content type?
No. COG describes the module structure. The display content can be segment, graphic, dot matrix or selected character-style content depending on the project.
What is the difference between COG and COB LCD?
COG bonds the driver IC directly onto the LCD glass, while COB bonds the driver IC onto a PCB. COG is usually thinner and more compact, while COB normally provides more PCB-level integration flexibility.
When should I choose COG LCD?
Choose COG LCD when the product needs a compact monochrome LCD module, thin structure, reduced module PCB area and flexible FPC integration.
When should I choose COB LCD instead?
Choose COB LCD when the project needs a larger PCB, touch buttons, more complex circuitry, more connector flexibility or a stronger PCB-based module assembly.
Can a Segment LCD use COG structure?
Yes. Segment LCD describes the display content, while COG describes the module structure. A custom segment LCD can be designed as a compact COG LCD module.
Can a Graphic LCD use COG structure?
Yes. Graphic LCD describes pixel-based monochrome content. Selected graphic LCD modules can use COG construction when compact size and FPC connection are important.
Can a Dot Matrix LCD use COG structure?
Yes. Dot matrix LCD content can be implemented in a COG module when the driver IC, glass design, resolution, FPC and mechanical structure are suitable.
Can COG LCD modules use LED backlights?
Yes. LED backlight color, light guide, brightness, current and mechanical structure can be reviewed according to the required display mode.
What LCD technologies are available?
COG LCD projects can use TN, HTN, STN, FSTN or VA technology depending on contrast, viewing angle, display color, multiplex ratio, temperature and cost.
What display modes are available?
Positive or negative display modes and reflective, transmissive or transflective optical modes can be reviewed.
What connection structures are available?
COG LCD modules commonly use FPC, PIN, soldering pads or project-based connector structures. The exact direction depends on the customer PCB and mechanical layout.
What interfaces are available?
The interface depends on the selected driver IC and glass design. I2C, SPI, parallel, segment-driver output or other project-based interfaces can be reviewed.
Can the FPC be customized?
Yes. FPC length, direction, connector location, pin definition and bending area can be reviewed according to the product structure.
Can you replace an existing COG LCD module?
Yes. Please provide the original module, photos, drawings, IC information, FPC details, pin definition, glass outline, display content, backlight and product information.
Is COG LCD suitable for large displays?
COG can support selected medium-size monochrome displays, but larger or structurally complex modules may be more practical with COB or another module structure.
What is the main limitation of COG LCD?
COG provides less PCB-level integration flexibility than COB, and the IC position, FPC, glass outline and connector must closely match the product design.
What information is required for quotation?
Please provide display content, LCD size, viewing area, resolution or segment layout, LCD technology, display mode, backlight, FPC, connector, interface, temperature, quantity, schedule and available drawings or samples.
