Organic Light-Emitting Display (OLED)

Frequently Asked Questions (FAQ)

Here are some frequently asked questions and answers about OLED (Organic Light Emitting Diode).

About the characteristics of OLED

What is burn-in? How can I prevent it?

When the same image is displayed for a long time or repeatedly, the brightness of some pixels may decrease due to progressive deterioration, or the brightness may increase due to temperature rise, resulting in a faint afterimage (burning) when the display is changed.
By not displaying the same image for a long time, and by using content that is dynamic and uses the entire display, such as scrolling displays, burning can be prevented.
It is also recommended to display images on a black background rather than a white background, since the more pixels that emit light, the more noticeable the burn-in.

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What is crosstalk? What can I do to prevent it?

Crosstalk is a phenomenon in which differences in brightness occur due to differences in the lighting rates of scan lines.
It occurs when displaying images with large differences in lighting rates, such as black text on a white background.
In passive OLEDs, the cathode wiring is shared by each OLED element, so if there are many dots to be lit, the loss in the wiring increases and Va rises.
When Va rises, the output current is reduced due to the characteristics of the IC, resulting in a decrease in luminance.
Crosstalk is a phenomenon that cannot be completely prevented due to the characteristics of OLEDs, but the following methods can be used to reduce crosstalk and make it less noticeable.

• Change the software settings for precharge period, voltage, etc.
• Use an image with a small difference in lighting rate between scan lines.

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What is the difference between AMOLED and PMOLED?

The drive system and structure are different. Please refer to this page for details.

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Please tell me about the resistance to static electricity.

We have carried out surge tests under the following conditions and confirmed that no abnormality occurs in the display of OLED (Organic Light Emitting Diode).

• HBM (Human Body Model) : 100pF, 1.5kΩ, ±1000V
• MM (Machine Mode) : 200pF, 0Ω, ±200V

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How to use OLED

What happens if I set the brightness higher than the spec value?

You can adjust the brightness by changing the "Contrast Control Value" of the software configuration example described in the specifications.
If the value is set to a higher value than the "contrast control value" listed in the specifications, the brightness will be higher than the value in the specifications.
However, since the voltage and current values will be higher than usual, and there is a risk of display abnormalities, we recommend that you use the product under conditions within the specifications.

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How can I extend the lighting and operating life?

The operating lifetime of an OLED (Organic Light Emitting Diode) is inversely proportional to its brightness, so halving the brightness will approximately double the life, and reducing the brightness by a quarter will approximately quadruple the life.
To ensure a long product life, it is recommended to reduce the brightness of the display or program it to automatically turn off after a certain period of time.

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Is there a recommended way to mount the OLED display on the housing?

There is no specific recommended method, but there are past cases where the following methods were used to fix the product.

• Attaching to the cover with optical resin (OCR/OCA)
• Attaching double-sided tape to the back of the OLED
• Press the back of the OLED with a sponge.
• Fix the OLED with snap fit on the housing.

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What are the precautions for handling?

An organic light emitting diode (OLED) has a structure consisting of two glass substrates laminated together and sealed.
If excessive force is applied to the substrate, the substrate may crack or the sealing resin may peel off, allowing moisture to enter and rapidly degrade the organic device.
Therefore, be careful not to secure the OLED with excessive force or drop it.

In addition, the driver ICs used in OLEDs have safety ratings, and exceeding these ratings will result in IC failure.
Please design the circuit so that the voltage and current values do not exceed the ratings and recommended operating conditions specified in the specifications.

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How should I store them? How long is the storage period?

We ship OLEDs in aluminum vapor-deposited bags that are sealed under reduced pressure.
Do not open the bag until you are ready to use it. Store the OLEDs in an environment where they are not exposed to direct sunlight or fluorescent light, where the temperature is between -5 and +35℃ and the humidity is less than RH65%.
It is recommended to use the product as soon as possible (within one month) after opening the package.
Deviations in temperature and humidity due to temporary environmental changes, such as during product transportation, are not a problem. (except for shipping by boat).

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About OLED manufacturing

What is the manufacturing process for OLEDs?

We manufacture OLEDs using the following processes. For more detailed information, please contact us using the inquiry form.

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