RFQ-stage drawing review
LCD Module Drawing and Specification Review Checklist for OEM Projects
An LCD module drawing review happens before quotation, tooling discussion or sample planning. Its job is not to test a physical sample. Its job is to check whether the drawing package, electrical specification and project inputs are complete enough for an engineering review.
Use this checklist when preparing a TFT LCD module, touch display, cover lens, bonded display stack or replacement display inquiry. It helps OEM teams send clearer RFQ files, reduce avoidable back-and-forth, and separate confirmed requirements from open engineering questions.
Quick Answer
A useful LCD module drawing and specification package should include the 2D outline drawing, active area, viewing area, thickness, FPC exit direction, connector details, pin definition, interface, voltage rails, backlight drive, touch and cover-lens stack, bonding route, environmental context, sample quantity, annual demand estimate and target schedule.
In This Checklist
The Four-Part RFQ File Pack
Instead of sending only a screen size or a screenshot, prepare a small file pack. It does not need to be perfect, but each file should answer a different engineering question.
LCD Module Drawing Redline Checklist
The first pass is a drawing redline review. The goal is to mark what is clear, what is missing and what may conflict with the host product.
| Drawing area | What should be visible | Why it matters before RFQ |
|---|---|---|
| Drawing identity | Part number, revision, date, unit, scale and view direction | Prevents quoting or reviewing the wrong drawing version. |
| Outer dimension | Overall width, height and module thickness | Defines whether the module can fit the product envelope. |
| Active area and viewing area | AA, VA, bezel and front-window relationship | Prevents image misalignment with the enclosure opening. |
| FPC exit | Exit side, bend direction, length, stiffener and keep-out zone | Decides cable route and assembly clearance. |
| Connector | Connector model or type, pitch, pin count, height and mating side | Controls host-board footprint and mating risk. |
| Pin 1 orientation | Clear pin 1 mark and connector orientation | Prevents reversed cable or wrong pin mapping. |
| Mounting method | Frame, mounting ears, adhesive area, gasket or screw constraints | Affects enclosure, tooling and assembly method. |
| Front stack | Touch panel, cover lens, printing, coating and bonding thickness | Changes total thickness, visibility and touch behavior. |
| Tolerance notes | Critical tolerances for fit or optical alignment | Helps decide whether the design needs tighter control. |
| Restricted areas | No-bend, no-adhesive, no-pressure or keep-out regions | Reduces cable damage and assembly defects. |
LCD Module Specification Review Checklist
The second pass checks whether the datasheet or specification explains how the display will connect to the host board. This is where many early RFQs become unclear: the module drawing may look acceptable, but the electrical file is incomplete.
| Specification area | Needed detail | Open-question example |
|---|---|---|
| Interface | SPI, MCU, RGB, LVDS, MIPI DSI or other interface route | Which interface should match the host processor? |
| Pinout | Pin count, pin order, signal names and unused pins | Is the host board already locked to a connector? |
| Voltage rails | Logic voltage, analog voltage, LED voltage and power sequencing | Are the available rails fixed on the current PCB? |
| Backlight drive | Voltage, current, dimming method and brightness target | Is brightness limited by power, heat or battery capacity? |
| Timing and initialization | Timing table, command sequence or driver IC notes where needed | Who owns firmware integration? |
| Touch path | RTP/CTP type, controller, I2C/USB/UART route and interrupt/reset pins | Will touch be tested on the final host board? |
| Optical target | Resolution, viewing direction, brightness, contrast and ambient-light context | Is the use indoor, outdoor, vehicle-facing or handheld? |
| Environmental context | Temperature, humidity, vibration, UV, cleaning or operating stress | Which risks are real for this product? |
| Lifecycle context | PCN, EOL, replacement or long-term compatibility concern | Does the project need a stable replacement path? |
For interface selection details, use the TFT LCD interface guide. For the actual inquiry package, use what to include in a TFT LCD module RFQ.
Open-Question Register for Drawing Review
A good drawing review does not pretend every detail is already known. It creates a short register of open questions so the OEM team and display supplier can decide what must be fixed before quotation, what can wait until sampling, and what should be tested later.
| If this is missing | Ask this redline question | Decision needed before |
|---|---|---|
| FPC exit direction | Which side should the FPC exit when assembled into the enclosure? | Sample request |
| Connector height | What is the maximum connector height allowed by the host PCB and housing? | Board layout |
| Pinout | Is the host board pin assignment fixed, or can it be adjusted? | Quotation or sample route |
| Brightness target | What ambient-light condition defines the brightness requirement? | Backlight selection |
| Cover lens drawing | Is the cover lens part of the display supplier scope or the customer scope? | Stack review |
| Bonding method | Is air bonding acceptable, or does the project require optical bonding? | Optical stack review |
| Annual demand | Is this a prototype batch, replacement demand or planned production program? | Commercial route |
| Schedule | When are RFQ, sample review, pilot build and production decisions expected? | Project planning |
Extra Inputs for Replacement Display Projects
Replacement projects need stricter file review because a similar-looking LCD module may still fail if the pinout, FPC, connector, backlight or driver IC changes. If the original display is discontinued or hard to source, include evidence from the old module.
- Photos of the front, back, FPC, connector and product label.
- Old datasheet, drawing or purchase specification if available.
- Host-board connector photo and available space around the display.
- Existing interface, pinout and backlight drive information.
- Critical dimensions that cannot change because of the enclosure.
- Any required UI, brightness, touch or viewing-angle behavior.
Do not rely only on diagonal size. For replacement review, the key question is whether the new module can fit the old electrical, mechanical and optical constraints.
Copy-Ready RFQ File Review Checklist
Use this table before sending the drawing package to SuccessLCD or before asking an internal engineer to review the files.
| File/input | Checklist item | Status | Open question |
|---|---|---|---|
| Drawing file | Correct revision, date, unit and part reference are visible | ||
| Drawing file | Outline, active area, viewing area and thickness are marked | ||
| Drawing file | FPC exit side, length, stiffener and bend route are shown | ||
| Drawing file | Connector pitch, pin count, height and mating direction are known | ||
| Drawing file | Pin 1 orientation and connector view are unambiguous | ||
| Drawing file | Mounting, adhesive, gasket or keep-out regions are shown if needed | ||
| Electrical spec | Interface, pinout, voltage rails and backlight drive are included | ||
| Electrical spec | Timing, initialization code or driver IC notes are included where required | ||
| Touch spec | RTP/CTP type, controller and communication path are defined | ||
| Optical spec | Resolution, brightness target, viewing direction and ambient condition are stated | ||
| Cover lens | Thickness, shape, printing, holes and AG/AR/AF needs are marked | ||
| Bonding | Air gap, OCA, OCR or optical bonding route is selected or open | ||
| Application | Use environment, temperature and mechanical stress are described | ||
| Commercial context | Sample quantity, annual demand estimate and schedule are provided | ||
| Replacement input | Old module photos, labels, drawing or host-board constraints are included if relevant | ||
| Decision log | Confirmed items and open questions are separated |
What the Drawing Review Should Produce
The output of B02 is not a pass/fail sample result. It is a cleaner engineering starting point for RFQ and sampling. After review, the OEM team should have one of these outcomes.
| Output | Meaning | Next action |
|---|---|---|
| Ready for RFQ | The file pack has enough detail for quotation and route discussion | Send the RFQ through the Contact page. |
| Needs drawing clarification | Mechanical, FPC, connector or cover-lens information is incomplete | Update the drawing or send enclosure constraints. |
| Needs electrical clarification | Interface, pinout, voltage, backlight or timing is unclear | Confirm host-board and firmware assumptions. |
| Needs stack decision | Touch, cover lens, coating or bonding route is not decided | Review touch and cover lens options and bonding needs. |
| Ready for sample validation | RFQ route and sample configuration are clear enough to test | Use the B01 sample validation checklist after the sample arrives. |
How SuccessLCD Uses Drawing and Specification Inputs
SuccessLCD uses the file package to connect the display requirement with the real project constraints. Depending on the project, the review can cover TFT LCD modules, RTP or CTP touch panels, cover lens, AG/AR/AF requirements, air bonding, optical bonding and interface routes such as SPI, RGB, LVDS and MIPI.
What we can review from files
- Module outline, active area and viewing area.
- FPC direction, connector and host-board constraints.
- Interface, pinout, voltage and backlight drive.
- Touch, cover lens, coating and bonding route.
- Brightness, environment, quantity and schedule context.
What still needs project confirmation
- Final enclosure clearance and assembly method.
- Host-board firmware and processor support.
- Exact reliability or customer approval plan.
- Final cosmetic acceptance criteria.
- Production route after sample and pilot review.
Suggested File Naming for Faster Review
Simple file names reduce confusion when several revisions are being discussed. Use a naming pattern that tells the reviewer what the file is.
| File type | Example name | Purpose |
|---|---|---|
| Module drawing | project-name_lcd-module-outline_rev-a.pdf | Mechanical and stack review. |
| Electrical spec | project-name_lcd-interface-pinout_rev-a.xlsx | Pin, voltage, interface and backlight review. |
| Cover lens drawing | project-name_cover-lens-printing_rev-a.pdf | Touch, printing, holes and coating review. |
| Reference photos | project-name_old-module-photos_2026-07.zip | Replacement or enclosure context. |
| Open questions | project-name_lcd-open-questions_rev-a.docx | Tracks missing information and decisions. |
FAQ
What should an LCD module drawing include before RFQ?
Before RFQ, an LCD module drawing should show the outline size, active area, viewing area, thickness, FPC exit, connector position, pin 1 direction, mounting or adhesive areas, front-stack thickness and any critical dimensions that affect the enclosure or host PCB.
Is a datasheet enough for an LCD module drawing review?
A datasheet is helpful, but it is usually not enough by itself. The review also needs drawing context, host-board constraints, FPC route, connector details, touch or cover-lens needs, quantity, schedule and application environment.
Why separate confirmed requirements from open questions?
Separating confirmed requirements from open questions prevents the supplier from guessing. It also helps the OEM team decide which details must be fixed before quotation, which can wait until sampling and which should be tested during sample validation.
What files are useful for a replacement LCD project?
Useful replacement files include old module photos, label photos, the original drawing or datasheet, host-board connector photos, pinout information, backlight drive details and mechanical constraints that cannot change because of the existing enclosure.
When should optical bonding be discussed?
Optical bonding should be discussed during drawing review if outdoor readability, lower reflection, front-stack strength, cover-lens integration or touch performance matters. The final route should match the cover lens, touch panel, enclosure and operating environment.
What happens after the drawing review is complete?
After drawing review, the project can move to RFQ, drawing clarification, electrical clarification, stack decision or sample planning. Once a physical sample arrives, use a separate LCD module sample validation checklist to approve the actual hardware.
Send Your LCD Drawing or Specification Package for Review
If you are preparing a TFT LCD module, touch display, cover lens, bonded display stack or replacement display inquiry, send the available files and mark any open questions clearly.
- 2D drawing, datasheet or old module photos.
- Interface, pinout, host-board or connector information.
- FPC direction, cover lens, touch and bonding requirements.
- Brightness, environment, quantity and target schedule.
Related Resources
Technical Reference Notes
This guide organizes common drawing, specification and RFQ-file review logic for LCD module projects. Final requirements should be matched to the actual LCD module, host board, enclosure, application environment and customer approval plan.
