In contrast to Asia, transparent displays have not yet established themselves across the board in Europe.There are already ideas for applications:• Functional panes: partitions to maintain hygienic distance (authority, hotel, information desk, taxi), partitions of meeting rooms with controllable transparency (for confidentiality), shading (e.g. skylight)• Augmented Reality: for example on the machine to visualize problems, or in commercial vehicles• Faces: of vending machines and freezers to see the product and display information about it at the same time• Showcases: with an explanation of the exhibits, for example luxury goods or museums• Infotainment: for product presentations, for example vehicle showrooms• Traffic: information at bus and train stops: timetable and location map;Timetables and advertising in public transport vehicles• Building technology: Elevators with glass fronts, flanks of escalators, window fronts, transparent doors• Digital signage: shop windows of fast food restaurants, shopping malls• Security: Control of flows of people where visibility must be guaranteedThis technical article is part of a series on transparent displays.Also read part 1 and part 2 on invidis.de.Particular attention should be paid to the design of the content.The color "black" does not exist - the display is simply transparent there and shows the background.In order to show off the transparency, the displayed content must consist of slender lines rather than large areas.The following figures show typical installations.Figure 1 shows the application of a transparent OLED in a museum.The object is presented and illuminated against a neutral background.The OLED is set up in front of it and serves as a protective front pane of a showcase.At the same time, it provides additional information about the exhibit that can be controlled interactively via a touchscreen.Figure 2 shows a transparent LED module as a window decoration in a restaurant.Individual modules are lined up in such a way that they fill the gaps between the window bars.The brightness of the LEDs is high, so that despite the great distance, they outshine the bright interior of the store.Different content can be displayed depending on the time of day.Figure 3 shows the use of a transparent TFT in Sharp technology as a separating screen between the customer and salesperson or the reception.Here the display is switched to opaque.Displays impress with their luminosity, high resolution and brilliant colors.However, one cannot see through them.This is made possible by transparent displays: They allow a view of what lies behind.Different technologies have different goals: TFT as a light valve works best in front of a brightly lit light box in which products are presented;the transparent OLED shines with very good transparency and emission of light through the OLED pixels;the multicolour LEDs of the transparent LED module are bright and easy to read, even from a great distance.The applications are as different as the technologies: shop windows for product presentation, fronts of elevators or windows in building services engineering, "augmented reality" on the machine or safety through transparency in public areas.While such displays are ubiquitous in Asia, there are still many opportunities to use this technology in Europe.Rudolf Sosnowsky is Head of Technology at Hy-Line Computer Components.As a member of the Hy-Line Group, the company specializes in complete system solutions in the field of display and touch technology as well as embedded computing at chip and board level.On the other hand, Hy-Line Computer Components supplies solutions for the management and transmission of high-speed signals such as DVI, HDMI, Displayport, USB, LVDS and V-by-One.