Displays and User Interfaces: Key Considerations for Professional Applications

Selecting a display and user interface for a professional application involves more than choosing a panel with the right size and resolution. The display must perform reliably within its intended environment, while the user interface needs to provide intuitive and dependable interaction with the system.

For industrial, medical and other quality-critical applications, factors such as display technology, optical performance, touch capability, environmental conditions, interconnects and manufacturing processes all need to be considered as part of the overall system design.

Selecting the Right Display Technology

TFT LCD panels remain one of the most widely used display technologies across professional and industrial applications. Available in a broad range of sizes, TFT displays can provide reliable performance and support long product lifecycles, making them suitable for many applications where consistency and availability are important.

However, TFT is not the only option. Micro-OLED and other specialised display technologies can be considered where an application requires characteristics such as higher contrast, a compact form factor or specific optical performance.

The appropriate technology ultimately depends on the requirements of the application and the environment in which the display will operate.

Optimising Display Performance

For applications used in bright or changing environments, display visibility can be a key consideration. TFT displays with brightness levels of up to around 3,000 nits can provide improved visibility in demanding lighting conditions.

Optical bonding can further enhance display performance. By bonding the display components together, optical bonding can help reduce reflections while improving sunlight readability. It can also provide additional protection for the display against impact and moisture.

For applications that are exposed to challenging environmental conditions, these considerations can be just as important as the underlying display technology itself.

Designing the User Interface

The display is only one part of the user interface. For many modern applications, projected capacitive (PCAP) touch technology provides the primary method of interaction.

PCAP touchscreens can support multi-touch gestures and can be designed to operate reliably when users are wearing gloves or when the interface is exposed to wet or outdoor conditions. This makes them suitable for applications where traditional touch interfaces may need to accommodate more demanding operating environments.

However, touch is not always the most appropriate input method. Depending on the application, additional input devices such as custom keyboards, trackballs or pointing devices can be incorporated to provide tactile feedback or more specialised control.

The choice of interface should therefore reflect how the equipment will actually be used, rather than being based solely on the display technology.

Considering the Complete Operating Environment

A display and user interface need to be designed around the conditions in which the finished equipment will operate.

Environmental considerations can include exposure to moisture, repeated movement and electrical noise. These requirements can influence not only the display itself but also the surrounding mechanical and electrical design.

Considering these factors early in the design process helps ensure that the display, touch interface, cabling and other system elements work together as intended.

Don't Overlook Cabling and Interconnects

Cabling and interconnects are an essential part of a complete display and user interface system, yet they can sometimes be considered later in the design process.

Custom cable assemblies, wire harnesses and connectors can be engineered to meet specific application requirements. Examples include overmoulded or IP-rated designs for moisture protection, high-flex constructions for applications involving repeated movement, and EMI-shielded designs where electrical noise is a concern.

The cabling needs to complement the display and interface requirements. Considering these elements early can help reduce the risk of signal integrity or mechanical issues further through the development process.

Manufacturing, Testing and Quality

Once the display and interface have been specified, the manufacturing process also needs to be considered, particularly for applications where consistency, traceability and long-term support are important.

A manufacturing capability that covers the complete route from prototype through to volume production can help maintain consistency as a product moves through development and into production. Depending on the application, this can include PCB assembly, optical bonding in controlled environments, system integration, environmental testing and final assembly.

For medical and other regulated applications, manufacturing processes and quality management systems are particularly important. ISO 9001 provides a framework for general quality management, while ISO 13485 is specifically focused on quality management for medical devices.

These standards support structured processes around areas including documentation, traceability, risk management and process consistency.

Taking a System-Level Approach

When specifying a display and user interface, individual technical specifications only tell part of the story. Brightness, display technology and touch capability are important, but they need to be considered alongside environmental requirements, interconnects, manufacturing processes and the expected product lifecycle.

Taking a system-level approach can help ensure that the individual elements work together effectively and are suitable for the intended application.

When evaluating display and user interface options, it is therefore worth looking beyond individual features and considering factors such as environmental ratings, expected product longevity, testing requirements and the documentation available.

Display and User Interface Design from RDS

Review Display Systems provides design, supply and manufacturing capabilities covering displays, user interfaces, cabling and complete assemblies.

By considering these elements together, RDS can support the development of display and interface systems from initial design through to manufacturing, helping customers select technologies and configurations suited to their specific application requirements.