First, consider the user’s viewing distance and the amount of content to be displayed on a single screen, ensuring that text and icons are clear and easy to read. Then, confirm that the aspect ratio and viewable area size match the window size. A resolution that is sufficient is fine; blindly pursuing higher resolutions will only increase costs and burden the motherboard.
Key factors are whether there is direct sunlight, if there is cover glass, surface reflection, UI color style and viewing angle. Outdoor use usually needs high brightness plus good anti-glare/anti-reflection, not just a big cd/m² number.
Interface selection should prioritize the main control chip and cable length: LVDS is suitable for medium-sized devices and longer cables, eDP is suitable for high resolution and new platforms, and MIPI DSI is mostly used in small-to-medium-sized, consumer-oriented devices. Generally, the solution that is natively supported by the motherboard and requires the least modification should be chosen.
When standard modules cannot match your enclosure or window size, or you need a special shape/appearance for branding and the volume is relatively stable, custom is usually worth it and can lower total cost over the whole lifecycle.
Discuss lifecycle and backup options with the supplier at the start, and try to validate at least one compatible alternative model early. Keep in touch about EOL notices so you have time to switch before a part is discontinued.
Focus on high/low temperature, thermal cycling, vibration/shock, ESD and backlight life. For harsh environments, humidity and other special tests may also be needed. Ask for test conditions and pass criteria, not only a simple “passed”.
Avoid point pressure on the active area, use flat support on the back and soft gaskets on the frame, and only lock screws in the designed mounting holes. Reserve bending space for the FPC and avoid sharp edges.
Balance the length and height so that text is still readable, and confirm your main board can drive the unusual resolution. At structure level, give enough support along the long side to avoid bending and brightness non-uniformity.
First, clearly define the actual operating conditions, such as temperature, humidity, and vibration. Conduct thorough “worst-case” testing during the prototype stage, ensure proper ESD and surge protection in the circuitry, and follow standardized assembly instructions. After mass production, promptly share on-site feedback with suppliers to jointly optimize parameters and processes.
Include size or active area, resolution, interface, brightness, viewing angle, temperature range, touch/cover glass needs, application scenario and estimated volume. The clearer the RFQ, the closer the price will be to real cost.
View the UI content from different angles based on the actual installation height and usage posture to see if the color and contrast are acceptable. The angle parameters in the specifications are only for reference; a truly accurate judgment requires seeing the actual device’s performance.
Different devices may differ in timing, gamma, backlight current, and cover glass, so even with the same module, colors can vary. To improve consistency, it is necessary to standardize drive parameters and color samples, and agree on an easy-to-use color acceptance standard with the supplier.
They add reflection and light loss, which can reduce brightness and contrast, especially with large air gaps. Proper AR/AG coating, reasonable thickness and good bonding design help keep the display clear while protecting the module.
Clear heat conduction paths should be reserved for the module backlight to avoid forming a small, enclosed, high-temperature space on the back. The brightness can be automatically reduced to reduce heat generation when the ambient brightness is low, and long-term aging tests should be conducted at the highest ambient temperature that the product may encounter.
The general process is as follows: requirements confirmation → specifications and drawings confirmation → engineering samples → complete machine testing → trial production → mass production. At each stage, dimensions, performance, and testing standards must be clearly recorded, and subsequent batches must strictly adhere to the same standards.
By simplifying the number and location of screws, designing clear positioning structures, and selecting easy-to-plug connectors, the modules can be structurally “assembled correctly and not backwards.” Combined with clear assembly instructions and fixtures, assembly errors can be significantly reduced.
First, compare the external dimensions, mounting holes, and viewing area, then confirm whether the interfaces and timings need adjustment. If switching from CCFL to LED backlighting, the backlight power supply and dimming method should be modified simultaneously, and some time should be allowed for fine-tuning of UI colors and brightness, as the new panel is usually brighter and has more vibrant colors.
The comparison should consider panel grade, interface type, brightness, temperature range, and testing standards, rather than just the unit price. A particularly low price often indicates compromised performance in certain areas. It’s advisable to request one or two comparative quotes with different configurations from the supplier to see if the performance and price are proportionate.
Either choose a panel with a supported resolution, adjust your UI to a supported mode, or add a scaler board. The best way is to coordinate target resolutions with your display supplier before main board design is frozen.
At the outset of the project, the dimensions, interfaces, environmental conditions, timelines, and estimated usage should be clearly defined. Before the resolution and window size are finalized, discussions should be held with suppliers to agree on key milestones such as specification confirmation, sample verification, trial production, and mass production. Regular technical communication helps to expose and resolve risks and problems early on.
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