03 JUN

Due to PWM dimming technology, LCD enthusiasts say OLED displays can be tiring to the eyes

  • Life Style
  • Vivian
  • Dec 06,2023
  • 0

Due to PWM dimming technology, LCD enthusiasts say OLED displays can be tiring to the eyes

Mobile phone manufacturers at home and abroad have been providing their flagship machines with organic light-emitting diode screens. oled panels manufacturer However, the mobile phone industry believes that LCDs are still superior to organic light-emitting diodes.

What is the reason that LCD users are still firmly escorted in the age of OLED screen mobile phones?

Liquid crystal displays and organic light-emitting diodes use the same luminous principle

LCD and OLED are the two display technologies most commonly used in China's smartphone market, flexible OLED along with TFT, IPS, AMOLED, and PMOLED, which are enhanced versions of these two technologies.

LCD and OLED display types.

It is a liquid crystal display technology that has been around for more than 20 years and is widely used in electronic devices including televisions, computers, and smartphones.

LCD screens are constructed like two glasses sandwiched together with a liquid crystal layer. china oled A thin film transistor is placed on the lower substrate, and a colored fluorescent layer is placed on the upper substrate. When voltage is applied to the middle layer of liquid crystal, different light characteristics will be produced, and finally, different colors will be produced by a color layer projection.

For the next generation of smart phones, organic light-emitting diode (OLED), the full name is organic light-emitting diode, is the best display solution.

The sub-pixels in OLEDs can emit light independently. They contain three sub-pixels: red, green, and blue. These arrays of sub-pixels are called OLED panels.

It is simply understood that the LCD light source and display layers are separated, and the organic light-emitting diode display layer and light source are merged into one.

OLED architectures have a number of additional features, including, but not limited to:

Organic light-emitting diodes have higher display efficiency than LCDs, which require multiple stages of "filtering" light.

As OLED screens do not require backlighting, they can be made thinner.

OLED displays can also be curved or even folded using different substrate materials.

Organic light-emitting diode screen branding and scintillation

Despite OLED's unlimited potential, it has also been criticized for its flaws, such as branding problems and flickering, compared to LCDS.

An organic light-emitting diode emits light from each pixel, and the brightness control is controlled by an electric current, which controls the color of the light-emitting material.

As a result of varying materials used in cultural color paintings, the overall luminosity is affected. In addition, trichromatic elements have different wavelengths and specific development requirements - for example, blue requires higher currents to function properly. This can lead to screen loss or low brightness, making it challenging to effectively control the brightness of each subpixel and allocate resources accordingly. This may result in a red OLED screen or what is commonly referred to as "residual shadow" or "branding".

It has been solved by manufacturers using PWM dimming instead of DC dimming to solve this problem. By blinking continuously on the screen, the human eye will produce a temporary visual effect, making it appear "always bright" after reaching a certain frequency. By increasing the flashing interval, you can reduce the brightness.

As a result of this PWM dimming, LCD users complain about stroboscope.

There is a high risk in white areas, a low risk in yellow areas, and no risk in green areas.

If the light output frequency is greater than 3125 Hz, it is considered to be no strobe, and it is exempt from entering the safety zone as stroboscopic range with low health risk.

Despite not being for mobile phone display screens, but for lighting, this report also shows a pattern: the higher the frequency, the lower the risk to health.