LCD, OLED and Direct-View LED: Read the Architecture

Start with the path that produces the image

A display specification becomes easier to read when four questions are answered separately: what produces light, what controls each pixel, what supports the electronics, and what can be replaced in service. A technology name usually answers only part of this.

In a conventional transmissive LCD, a backlight supplies light and the liquid-crystal layer modulates it through the optical stack. In OLED, organic light-emitting elements generate the image. In direct-view LED, the viewer sees an image formed by an array of inorganic light-emitting diodes. These architectures lead to different optical, electrical and mechanical design choices.

Keep construction terms on separate lines

SMD describes surface-mounted components; COB describes die mounted directly on a board; COG describes a chip-on-glass construction. In display proposals, the exact implementation must be identified with a drawing or module specification. GOB commonly refers to a protective encapsulation process. Encapsulation and emitter mounting can describe the same assembly at different levels.

MiniLED can describe an LCD backlight or a direct-view implementation. MicroLED terminology also needs the actual device and assembly definition. Ask for the active display technology and pixel structure instead of inferring them from the product family name. A screen described as an “LED display” might otherwise mean either a backlit LCD or a direct-view LED wall.

Compare at the system boundary

Build a comparison sheet using the same active dimensions, content, operating luminance, viewing locations and service requirements. Include controller hardware, power conversion, mounting, cooling, protective glazing and spare parts. Keep an optical comparison and an installation comparison alongside each other: a finer pixel matrix does not establish the necessary access space or mounting load.

For a transparent system, add a drawing of the visible aperture and every opaque component. Record whether transparency is an optical measurement or an area ratio. For a modular wall, identify the smallest replaceable unit and how its calibration is restored. Confirm the software and configuration files required to commission a replacement.

Information to put in the project brief

• Active image width and height, native pixel matrix and orientation.
• Display architecture, module construction and protective layers.
• Actual viewer task, ambient conditions and operating schedule.
• Replacement unit, access direction, spares and calibration procedure.
• Evidence for the exact assembly and the configuration offered.

The resulting architecture sheet is the starting point for optical tests, electrical sizing and installation drawings. VITREVIA supplies and integrates the agreed display system directly from China.