POL Lamination (POG) Process for TFT LCD Modules
Before a TFT module can show an image it must be polarised — and that is the job of the POG (polarizer-on-glass) step. The two polarizer films are laminated onto the finished LCD glass with an optical-clear adhesive, and the cleanliness of that lamination is what protects yield and the final optical quality. This page walks the POG sequence: glass cutting, washing, polarizer attachment, defoaming and electrical test.
The POG Sequence
| Step | What happens |
|---|---|
| Glass substrate cutting | Mother glass cut into cells, small pieces basketed and handled |
| Glass washing | Multi-tank wash and dry to remove particles before lamination |
| Polarizer attachment | Top and bottom polarizers applied with optical-clear adhesive |
| Defoaming | Vacuum + pressure collapse trapped air at the adhesive interface |
| Electrical test | Each cell checked for function and polarisation correctness |
Where Quality Is Won
The whole step lives or dies on cleanliness. A particle caught under a polarizer is a permanent visible defect; a bubble weakens the bond and shows on the image. That is why the glass is washed in multiple tanks and the lamination is done under controlled conditions, and why defoaming follows every attachment.
Why a Buyer Should Care
A supplier's POG discipline shows up as defect rate and consistency across a lot. When you qualify a module, ask about polarizer lamination yield and particle control — it predicts field returns better than a spec sheet.
Matching Standard Panels
Every standard module passes through POG. These sizes are frequent subjects of front-end qualification:
- RG-T050BWSA-02 — 5.0″ 800x480 1000 cd/m² IPS TFT
- RG-T070BAHA-02 — 7.0″ 1024x600 1000 cd/m² IPS TFT
- RG-T035HLSWA-01 — 3.5″ 320x240 1200 cd/m² IPS TFT
Related Guides
- Manufacturing Process Overview — all five steps
- FOG (Film-on-Glass) Bonding — the IC bonding step
- LCM Assembly — the final module build
Frequently Asked Questions
What is the POG process?
POG is polarizer-on-glass: the two polarizer films are attached to the finished LCD glass, one on each side, with a uniform optical-clear adhesive. It is the front-end step that turns bare glass into a polarised display cell.
Why does washing matter so much?
Any dust under the polarizer becomes a permanent visible defect. Glass is washed and the lamination is done in a controlled environment precisely to keep particles out — cleanliness here is what protects yield downstream.
What is defoaming?
After lamination, vacuum and pressure are applied so any trapped air at the adhesive interface collapses — removing the bubbles that would otherwise show as defects and weaken the bond.
Talk to Our Engineers
Send your quality and qualification questions to sales@odmlcd.com — we will reply with how POG yield is controlled on your module.