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The differences between mobile phone LCD and OLED

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Author : Nico
Update time : 2021-08-17 15:34:54

When you see a phone, tablet, or TV these days, it's probably either using an LCD or an OLED display. These two display technologies have been developing over the years, and they now exist in every corner of our everyday lives. There are a lot of differences between LCD and OLED technology, but what are these? Here is a dive into the science behind these two technologies and what makes them different from one another.



LCD stands for "Liquid Crystal Display". The basic science behind LCD technology can be complicated because different types exist. To keep things simple, this article will only discuss the science behind the most basic and straightforward type of LCD: the calculator LCD.
To begin with, external light enters the display and hits the vertical polarization filter. Though the polarized light passes through the first electrode unparsed, it gets twisted 90 degrees after hitting the liquid crystal. Now, it can pass through the horizontal filter. The light hits the reflective panel and then bounces back through the layers and to the viewers' eyes.

When a current is introduced to the liquid crystal, the process is interrupted. The vertically-polarized light passes through the liquid crystal unchanged. This means that it gets blocked when it hits the horizontal polarization filter. This results in a black spot. That black spot would be the numbers you then see on the screen.

Smartphone and TV displays are a bit different, but ultimately, they share the same concepts. There is a flat panel that's set up behind the layers that provide light. It gets polarized as it travels through the layers and eventually hits the red, green, and blue sub-pixels. This is how the light gets its color before it hits the viewers' eyes.

OLED stands for "Organic Light Emitting Diode". One differentiator compared to an LCD is that OLEDs emit their light. LCDs, on the other hand, require a light source—like a backlit panel, OLEDs, or ambient light.

The diode is rich in electrons, which makes it negatively charged. The Anode is rich in electron holes (the lack of electrons in atoms), which makes it positively charged. When a voltage is sent between those two layers, the electrons and holes will flow towards one another.
When electrons and holes meet, they cancel each other out, releasing energy in the form of photons (light). The higher the voltage, the more photons that are produced, and thus, the brighter the light. The emitted light then gains its color by passing through the red, blue, and green color filters of the sub-pixels.

As an LCD factory with 16 years' LCD manufacturing, KTBABA has abundant experience in both LCD and OLED screen production. To provide top-quality LCD and OLED screens to its customers, KTBABA has a strict quality control system. The strict quality control system includes the test for each piece of the LCD twice, just to make sure to send the good condition products to its customers.

 
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