FPC, Backlight and PCBA: What Can Be Changed Without New Glass

Most display customisation happens around the glass, not in it. FPC length, pin order and exit direction, connector, backlight brightness and colour, driver selection and the PCBA are all changeable on an existing panel at 100 pcs with no mask and no tooling. Knowing that boundary is worth money: it is the difference between a 100 pcs order in 10-20 days and a tooled part at 1,000 pcs.

Written by the Junxian applications engineering team. Figures quoted for “our models” are calculated from the 103 models on this site that carry a full parameter set, so they change when the catalogue changes.

What can be changed without tooling

Here is the whole boundary in one table - find your change and you have your MOQ tier and roughly your schedule.

FPC: the change people request most

Length, pin order, exit direction and stiffener position are all open. Two things to decide on the drawing rather than at the sample stage: which way the tail leaves the module relative to your board, because a tail that exits the wrong side turns into a fold that stresses the bond; and the bend radius, because an FPC folded tighter than it likes fails after thermal cycling rather than immediately - the worst kind of failure, because it passes your prototype test. Send the mechanical drawing with the board position marked and this becomes a five-minute conversation.

Backlight: brightness, colour and drive

Brightness is set by LED count and drive current, and both are adjustable within what the light guide supports. On monochrome character and segment modules the backlight colour is a genuine choice - white, blue, yellow-green, amber, red - with no cost difference between most of them, which makes it free branding. On colour panels the backlight is white by design. What to tell us: the brightness you need at the dimmest usable setting, whether it is PWM or analogue dimmed, and the supply available - the driver follows from those three.

Driving voltage across our range

Most modules are 3.3 V or 5 V logic. The outliers are worth knowing about, because they remove a regulator from your board:

Logic supply as specified per model. The 9-60 V entries are smart serial modules built to sit directly on a battery or charger rail without a separate regulator.

PCBA and smart modules

Where a module carries a PCB, the board itself is customisable: connector placement, level shifting, an on-board regulator so you can feed it a raw supply, or a controller with your command set on smart serial modules. This is where a display supplier can remove work from your hardware team rather than adding it - if your board is doing level shifting and power conditioning purely to feed the display, that belongs on the module.

Cover glass and bonding sit at the boundary

Cover glass outline, thickness, printing and hardening are per-project items - tooled, but cover-glass tooling rather than a glass mask, so they stay in the 100 pcs tier. A new touch sensor pattern is the point where you cross into 1,000 pcs. If you are close to that line, ask us before finalising the artwork: adapting a design to an existing sensor pattern is often invisible in the finished product and materially cheaper.

What we need to quote a modification in one round

The base model (ours or the one you use now), the mechanical drawing with the FPC route and connector position, the supply voltage available, the brightness at nominal drive, and the annual quantity. Missing the drawing is what turns a one-round quotation into three.