How to Specify a Custom Display Touch Module: The 10 Details Your Supplier Needs

Direct answer

Most display enquiries take three or four rounds of email because the first message is missing the same handful of details. Send these ten and you will usually get a usable proposal — part number, drawing and price — in the first reply: size and active area, resolution, technology, touch requirement, interface, integration level, environment, brightness or lighting, mechanical constraints, and commercial terms.

The ten items

1. Display size and the active area

Give the size you have in mind, but more importantly give the window in your enclosure. The mechanical opening is a hard constraint; the diagonal size is adjustable. If the module must fit an existing bezel, the opening dimensions and the available depth decide more than anything else.

2. Resolution

State the resolution you need, or the smallest feature a user must read. Resolution follows from the content: a single large value needs far less than a drawing or a data table.

3. Technology

E-paper, TFT LCD or OLED. If you are unsure, describe the constraint instead — “must run on batteries”, “must be readable outdoors”, “must show video”, “must be as thin as possible” — and let the supplier tell you which technology that rules in.

4. Touch requirement

Whether you need touch at all; and if so, capacitive or resistive.

• Capacitive — multi-touch, light finger touch, better optical clarity; needs a bare finger or a capacitive stylus.
• Resistive — works with a gloved hand, any stylus, or a fingernail; pressure-based.

Industrial equipment often chooses resistive for exactly that reason. Say which environment the operator’s hands are in and the choice usually makes itself.

5. Interface

What your host board can talk to. Options you will be offered include HDMI, UART, RS232, RS485, I²C, SPI, RGB, MIPI and LVDS. This choice is often the single biggest driver of engineering effort — a host with spare UART wants a serial module; a host with HDMI wants a monitor-like module.

6. Integration level

Bare panel, panel with driver board, module with a mainboard, or a module with an Android/Linux system board. The fastest way to answer this: who writes the graphics code? If you do, ask for a panel. If you want the display to arrive working, ask for a kit.

7. Environment

Where the product will be used and what it must survive: indoor or outdoor, whether it sees direct sun, temperature extremes, humidity, condensation, vibration, washdown or chemical exposure. Do not assume a range — state the requirement and have the supplier confirm the panel’s rated limits. This is also where enclosure sealing (IP rating) gets decided.

8. Brightness and lighting

For TFT, how bright the screen must be for its location. For e-paper, whether the product will ever be used in the dark, which determines whether a front light is needed. Both change the module stack, so decide before the mechanical drawing is frozen.

9. Mechanical constraints

Overall thickness available, connector position and direction, FPC exit side and length, mounting hole pattern, and whether a cover glass or protective layer is part of the assembly. Sending a simple section drawing of the enclosure removes more uncertainty than any amount of text.

10. Commercial terms

Annual quantity and expected first-order quantity, target unit cost if you have one, required sample date, certification the product must carry, and how long the product will be manufactured. That last one matters: a module chosen for a five-year production run should not depend on a component that will disappear in eighteen months.

A template you can copy

Application:        (what the product does)
Enclosure opening:  (w × h mm)   Available depth: (mm)
Display size:       (inch)       Resolution: (px)
Technology:         (e-paper / TFT / OLED / not sure)
Touch:              (none / capacitive / resistive) — multi-touch? gloves?
Interface:          (HDMI / UART / RS232 / RS485 / SPI / I2C / RGB / MIPI / LVDS)
Integration:        (bare panel / + driver board / + mainboard / + OS board)
Environment:        (indoor / outdoor, sun exposure, temperature, vibration, sealing)
Lighting:           (brightness need, or front light required? yes/no)
Mechanical:         (thickness, connector side, FPC direction, mounting, cover glass)
Quantity:           (first order / annual)
Target cost:        (if applicable)
Sample needed by:   (date)      Certification required: (…)
Production life:    (years)

What happens when an item is missing

Frequently asked questions

Can I start with a rough specification? Yes — send what you know and mark the unknowns. A supplier who builds custom modules can usually tell you which open items actually change the part number and which are negotiable.

Do I need to send drawings? A simple sketch of the enclosure opening with dimensions is enough to start. Detailed drawings can follow once the concept is agreed.

What if I don’t know which technology I need? Describe the constraint you cannot move — battery life, daylight, thickness, cost, video. That is more useful than naming a technology.

How early should I involve the supplier? As early as possible, ideally before the enclosure is frozen. Display and touch decisions change the mechanical stack, and re-cutting a bezel is more expensive than choosing a different module.

Next step

Send the template above, even partially filled, and we will come back with the modules that fit and the open questions that actually matter. Good Light International Company Limited supplies e-paper, TFT LCD and OLED display touch modules and kits, standard or customised, with no MOQ.

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