What Is an LCD Panel Grade? A-Grade vs B-Grade Explained

A school district in Europe ordered 40 interactive flat panels through a broker at a price that looked too good to be true. Six months in, five panels had dead pixels and two had uneven backlight. The specs on paper were identical to every other board — the difference was the panel grade nobody mentioned.

What a Panel Grade Actually Means

Every LCD panel comes off the production line and gets sorted into grades, mainly by dead pixels and brightness uniformity. A dead pixel is a single point on the screen that stays one color — black, white, or stuck on red, green, or blue. The more of them a panel has, and the closer they sit to the center, the lower the grade.

This grading isn't a marketing label. It's how panel makers decide which panels go into premium displays and which go into budget ones.

What You Get With an A-Grade Panel

• Few or no dead pixels. An A-grade panel meets a strict dead-pixel allowance — usually none in the center viewing area.
• Even brightness. No dark patches or bright spots when you show a white screen.
• Consistent color. Whites look white, not yellow or blue, across the whole surface.
• Longer, cleaner life. The panel holds its color and brightness for years, not months.

What You Get With a B-Grade Panel (or Lower)

B-grade panels are the ones that didn't pass the top threshold. They carry more dead pixels, uneven backlight, or color drift — and they cost less. On a monitor you sit 60 cm from, you might not notice. On an 86-inch classroom board that kids look at all day, it's worse: the defects sit in the middle of the room, magnified.

Lower-grade panels still “work.” They power on, they respond to touch. The problem shows up as a slow fade — a stuck pixel here, a yellow patch there — six months after the warranty paperwork is filed.

Why It Matters in a Classroom or Meeting Room

You don't buy an interactive flat panel to replace it in two years. A school panel runs six to eight hours a day, five days a week, for five or more years. A meeting room panel is the first thing clients see when they walk in. In both cases, a patchy, uneven screen quietly tells everyone the equipment was bought on price alone.

What To Check Before You Buy

1. Ask the panel grade outright. A supplier who won't name the grade is usually selling a lower one.
2. Ask the dead-pixel policy. What's the allowance, and where? Center pixels matter more than corner ones.
3. Ask the panel brand. A-grade panels from top makers like BOE and CSOT behave differently from no-name panels.
4. Ask for a sample. Put up a white screen and a black screen. Uneven backlight shows immediately.

Where To Get One

Lonton interactive flat panels are built on A-grade BOE and CSOT panels, assembled in a 23,000 m² Class 10,000 cleanroom and run through aging tests before they ship. Every panel is checked for dead pixels and brightness uniformity. 55” to 110”, factory-direct, MOQ 5 units.

FAQ

What is an A-grade LCD panel?
A panel that passed the top quality threshold — few or no dead pixels, even brightness, and consistent color.

What's the difference between A-grade and B-grade?
B-grade panels carry more dead pixels, uneven backlight, or color drift. They cost less and fade faster.

How do I check a panel's grade?
Ask the supplier directly, ask the dead-pixel policy, and run a white-screen test on a sample.

Do all interactive flat panels use A-grade panels?
No. Budget boards often use lower-grade panels to hit a low price — that's where the fade shows up later.

Get a Quote

Tell us the sizes you need and we'll send factory-direct pricing on A-grade BOE and CSOT panels — with the dead-pixel policy in writing.