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Supplier qualification is a documentation exercise with a factory visit in the middle. The certificate gets a supplier onto the shortlist; the records decide whether it stays there. This page lists what to request, what each document proves, and the findings that should stop a qualification before pricing is discussed.
Whether the supplier can hold a specification for the product's life.
Cost and capability are easy to compare. The harder question is whether the factory's processes, traceability and change control will still produce the same module in year five, and whether evidence exists when something goes wrong. Qualification is the process of answering that question before the first order rather than after the first field failure.
Framed that way, the evidence set is short: what the quality system covers, what the process controls are, what the records look like, and how changes are notified.
Read the scope, the site and the validity period.
A quality-system certificate is evidence that documented processes exist; it is not evidence about a specific product. The three fields that matter are the scope statement, which names the site and activities covered; the validity period, because certificates expire and are re-issued; and the issuing body, which should be an accredited certification body. A certificate quoted for a group while manufacturing happens elsewhere is the most common mismatch in display supply.
Verify the certificate with the issuing body or an accreditation register rather than accepting a scan. The registers are described by the International Accreditation Forum and ILAC.
Six documents, each answering a different question.
| Document | What it proves |
|---|---|
| Product specification with tolerances and test methods | The module is defined, and each limit can be verified |
| Drawing set, including the front assembly stack | Materials and geometry are controlled |
| Reliability test reports at stated conditions | Environmental and mechanical performance was measured |
| Material declarations for the front assembly | Substance and cleaning-agent compatibility is known |
| Traceability example | A delivered lot can be linked to its materials |
| Change notification commitment | Substitutions will be surfaced before they ship |
Where a document is described as available on request, ask in the qualification phase; a supplier that cannot produce the set while it is trying to win the business will not produce it later either.
Ask for the plan that names your part number.
A control plan should identify the process steps, the characteristics that matter, how each is measured and what happens when a measurement drifts. The related document is the inspection standard: the illumination, viewing distance, defect limits and boundary samples used at final inspection. Together they answer whether the supplier can accept a batch the same way you will.
Where a process has no measurable parameter, such as a cosmetic inspection, the acceptance criteria should exist as a document with photographs or boundary samples rather than in an inspector's experience.
Both should be demonstrable, not asserted.
Ask the supplier to reconstruct the history of one delivered unit: module lot, panel lot, LED bin, adhesive batch and glass batch. Then ask for the notification categories the supplier manages - panel source, driver IC, LED bin, adhesive, glass, coating, print, FPC, firmware, production site - and the window before shipment. For displays, the changes that matter most have no electrical signature: an adhesive or coating substitution alters optics and durability while passing every functional test.
Workmanship and inspection expectations for the assembly are published by bodies such as IPC.
Follow one unit through the plant and ask for the record at each stage.
The evidence that proves control is the record produced by the process: incoming material lots, process parameters for the running shift, test results with limits, non-conformance handling and packing. Compare a rejected unit and a passing unit against your own boundary samples, and check the calibration records for the instruments that support any performance claim.
Where the bonding or coating steps are outsourced, ask for the sub-supplier controls and the incoming inspection performed on their deliveries; that boundary is where many traceability chains end.
Each stage should close a question with evidence.
An evaluation sample proves the concept fits; A-samples prove the design with intended materials; B-samples prove environmental and optical performance; and a pilot build proves the process can hold those results at production rate. The gate that matters for supply confidence is the pilot: first-article inspection, capability data for critical characteristics and a defect Pareto from a production-rate build.
Where a supplier proposes to skip the pilot for a custom module, treat the omission as a schedule risk rather than a saving.
Nominate a supply plan, not only a supplier.
The commercial questions are: committed monthly capacity for this module and how much is already allocated; which tools, jigs and fixtures are dedicated to the part and who owns them; the lead time for a repeat order at production volume; and the plan when a panel source reaches end of life. Ask for the last two in writing, because they are the items that determine whether the product can be supported after the launch.
CDTech publishes its certificate scope on the quality certifications page and its company profile at company, which is the level of disclosure a qualification exercise should expect from any supplier.
Five findings that affect product shipped tomorrow.
Certificate scope that excludes the site or product line being purchased.
No traceability from finished goods back to material lots.
An inspection standard looser than the one you will apply, with no agreed boundary samples.
Measuring equipment out of calibration, or no calibration records.
Process parameters outside documented limits on the running shift.
Each of these is a process failure rather than a paperwork gap, and each is cheaper to discover before nomination.
Independent results carry weight when the scope is stated.
Third-party laboratory reports are useful where a specific claim must be verified independently, but the report's value depends on the sample, the configuration and the conditions being recorded. Bodies such as Intertek, TUV Rheinland and SGS publish testing scopes, and the accreditation of the laboratory behind a report is what makes it comparable to another.
Where a supplier quotes an approval rather than a test, check what the document actually attests to: a management-system certificate, a component approval and a test report are three different things.
Nine items to complete before pricing is negotiated.
Certificates with scope, site and validity, verified with the issuing body.
Product specification with tolerances and test methods.
Drawing set and bill of materials with named materials.
Reliability test reports at stated conditions.
Material declarations, including adhesive and coating.
Traceability demonstration on a real lot.
Change notification commitment with categories and window.
Capacity, tooling ownership and lead-time commitment in writing.
Discontinuation notice period and a replacement plan.
A supplier that answers these in the first meeting is demonstrating the behaviour the programme will depend on in year five, and the answers themselves become the basis of the quality agreement.
Which certificate should a display supplier hold?
It depends on the market: ISO 9001 as a baseline, ISO 13485 for medical supply, IATF 16949 for automotive, and often ISO 14001 for environmental management. The certificate matters less than its scope, which should cover the site and product line you are buying from.
How do I verify that a certificate is genuine?
Check it with the issuing certification body or through an accreditation register rather than accepting a scan, and read the scope statement to confirm it covers the site and product line. Registers and the accreditation framework are described by the International Accreditation Forum and ILAC.
What is the difference between an OEM and a custom part manufacturer?
An OEM supplies a product designed and branded by the buyer, often with documented specifications and change control; a custom part manufacturer builds to the buyer's drawing, which places more of the specification work and quality responsibility on the buyer. Most display programmes sit between the two: a standard panel with a customised front and interface.
What should be in a supplier quality agreement?
The specification by revision, change notification categories with a defined window and sub-supplier flow-down, acceptance criteria referencing the inspection standard and boundary samples, traceability and record retention, non-conformance and corrective-action timing, and discontinuation notice with a workable last-order date.
Send the module specification and the markets you sell into to CDTech; the reply will provide the certificate scope, the process documentation and the traceability example relevant to that programme.
Contact [email protected] or use the contact page.
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