Frequently asked questions

General

Are LUMINEQ displays OLED or LCD?

LUMINEQ products are Thin Film Electroluminescent (TFEL) displays, not OLED nor LCD. Our displays are inorganic design and emit lights themselves. 

Our displays comprise a solid-state glass panel, an electronic control circuit, and a power supply. The glass panel, the heart of the assembly, consists of a luminescent phosphorous layer sandwiched between transparent dielectric layers and a matrix of row and column electrodes.

The circuit board, which contains the drive and control electronics, is connected directly to the back of the glass panel. A pixel on the display is lit by applying voltage to the row and column electrodes, thus causing the area of the intersection to emit light.

For more information about TFEL technology, please visit our Technology page.

Where is this display technology used already?

LUMINEQ electroluminescent display technology itself has been used for over 30 years for very rugged applications in defense, industrial, marine, and aerospace industries. Transparent and in-glass displays are used for optical devices and vehicles. Public references include Valtra tractors, Chengdu metro train, and Honda racing motorbike.

I want to evaluate your displays. Can I buy a sample or a demo kit?

All of the LUMINEQ product lines offer demo products. The list of demo products can be found from our Rugged Displays, Transparent Displays, and In-Glass Displays page. You can request a quote on any of the individual demo product page or on the Contact us page.

 

What is the maximum size display available?

We offer displays with active area up to 240 x 180 mm. It is possible to use multiple displays together, depending on the final design. 

What is the display operating temperature specification?

The operating temperature range of LUMINEQ displays is from -60 °C to 105 °C (-76°F to 221°F). Instant-on regardless of temperature. Since they are inorganic design, the performance is not affected by the temperature, so they are perfect for extreme conditions. 

What colors are available?

We have two different phosphors currently; a yellow and green. For outdoor use we recommend yellow as it is by default brighter. For indoor use or with tinted background applications green is also possible.

In-Glass Displays

What are the benefits of using LUMINEQ displays for HUD?

Using LUMINEQ in-glass laminated displays for HUD simplifies the setup and saves space, and doesn't have viewing angle limit. 

A typical HUD uses a projector system to project the information to the windshield in front of the driver. It contains three primary components: a projector, a combiner, and a video generation computer. While this complicated setup works for cars, it occupies valuable space in the car with a strict requirement for the projection angle. Moreover, it doesn't work for vertical windshields in buses, trucks, or industrial vehicles. 

We offer a simpler solution. By laminating a thin-film transparent display in glass, the information can be shown directly on the windshield without any extra setups. It saves space and may also bring the cost down. 

 

Are the stand-alone demonstrators suitable for designing a customer end-product?

Yes, they provide a smooth way to evaluate the technology. They can also give design ideas for a customer specific content.

What interfaces are supported?

Interface is customizable. Typically our displays support standard interfaces like RS485, I2C, CAN and NMEA.

Do your displays have touch functionality?

Yes. We can utilize the same thin film layers to embed a touchscreen functionality. The touch sensors are integrated directly in the functional display layer. So no additional touch layer is required.

Does the display with touch function work in rain?

Yes. LUMINEQ touch technology has been engineered to work in the rain and in extreme temperatures.

The windshield of a car is required to have at least 70% transparency. How transparent are your displays?

LUMINEQ transparent segmented displays have over 80% transparency and matrix 70%. When the segmented display is laminated in glass, the transparency is 70%.

What is the thickness of the glass?

For the stand-alone solution it is normally 1.1 mm + cover glass (from 0.33 mm up).

For the lamination purpose we use 0.7 mm glass.

 

What’s the viewing angle of your display? Are there polarizers?

LUMINEQ transparent displays have a 360° viewing angle without polarizers. They work with all the sunglasses. 

How is the display affected in different environmental conditions?

When properly laminated in glass, LUMINEQ display is fully protected and the ruggedness is excellent. The technology is inorganic and solid-state, which makes LUMINEQ the most durable display type in the market. 

Can the light intensity be controlled?

Yes, we can implement a frame rate and/or voltage-based dimming methods.

It is possible to show information on both sides of the window/windshield where your display is laminated in?

Yes. LUMINEQ display allows dual directional communication. You can show information to exterior people or exterior people with our display, and communicate in either direction.

Transparent display for optical devices

Are the displays customizable?

Yes, we can customize the size, shape, thickness and naturally the segment and chrome pattern designs. Flex, electronics, and the interface are also fully customizable.

What is the intention of the chrome?

Chrome patterns can be used as traditional crosshair, which will be visible when display is off. Chrome behind the segments also nearly doubles the brightness.

Can segmented micro displays show colors?

Our displays are monochrome. Yellow is our brightest color, but we can also make green.

Is the transmission the same on full FOV?

There is a marginal difference between sections with and without ITO.

What is the minimum size of the drop dot/graphical detail?

Currently the minimum size is 10µm. We are working to support smaller details.

How much space is needed between drop dot/graphical detail for separation?

Typically needed space is 10µm.

How quickly can you turn dots/segments on and off for a motion effect? Frame rate?

Typical frame rate is around 500 fps.

Is there a demo kit available?

Yes, we have four types of demo kits with 10 µm and 20 µm crosshair thickness with and without traditional chrome crosshair. Check out our reticle demonstrator ELT32S-RETICLE-BAT product page.

What are the supported interfaces?

Interface is customizable. Typically our displays support standard interfaces like I2C.

Rugged Displays

What’s the operating lifetime of LUMINEQ rugged displays?

The operating lifetime of LUMINEQ TFEL rugged displays is over 20 years. 85% of original brightness remains after 100 000 hours of usage.

Does temperature and/or humidity affect the lifetime?

LUMINEQ displays are inorganic solid-state design. So their lifetime is not affected by the external environments such as temperature and humidity. 

What interfaces are supported?

Supported interfaces for the rugged displays are SPI, 4-Bit LCD and 8-bit µP.

Custom Displays

Can I have transparent and non-transparent elements on one screen?

Yes. We've done projects for customers who wanted to combine transparent and non-transparent displays for the same application. See the demo image below.

TASEL-+-TFEL1200x628

 

What is the lead time for a customized display development?

It depends on the complexity of the display design. The typical development time of a custom display is 12-14 weeks. To start, you may request a custom display by submitting a form. The more information you provide to us regarding your project and design requirements, the more likely we can create a suitable proposal for you.

Need a custom display for your project?

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