Differences Between Small Mobile Phone OLED Screen And Large OLED TV Screen

- Apr 12, 2020-

Most people think there should be no difference between OLED panels on phones and OLED panels on TVS, which are both OLED panels.In fact, TV and mobile phone use OLED technology is not the same.Here, jushi displays the difference between a small phone OLED screen and a large OLED TV screen.

OLED(organic light-emitting diode) is arguably the most important development in display technology after LCD(liquid crystal display).Not only does it look better than a traditional LCD panel, it's extremely thin because it doesn't require backlighting.

Whether it is large or small, the advantages of OLED are very obvious.Many of today's flagship phones have OLED displays, including the samsung Galaxy series, the apple iPhone X, the Google Pixel 2 and the oneplus 5T.At the same time, OLED TVS have begun to dominate the high-end market, including LG, SONY, panasonic and philips products.

Although the OLED panels used in TVS and mobile phones have similar technology and work in a similar way, the gap in materials and fabrication can make a big difference.

Differences between small mobile phone OLED screen and large OLED TV screen

1. AMOLED and POLED: most displays do both

Samsung and LG refer to their OLED panels as AMOLED and POLED, but they are really just different parts of the OLED panel.

"AM" refers to the "active matrix" and represents the way individual OLED pixels are used.A passive matrix OLED panel is fine for fitness trackers, but for things like watching video, active matrices are required.

This means that all OLED panels, from televisions to mobile phones, use an active matrix.Samsung's practice of calling its OLED panels amoleds is redundant, which is like calling LCDS amlcds because they are all active matrices.

The "P" in POLED stands for plastic.Plastic is lighter, more suitable for use on mobile phones and makes the screen easier to bend.So while not all POLED are amoleds (and vice versa), most OLED panels today are both based on plastic.

2. RGB and WRGB subpixels: different but not necessarily better

Each screen is made up of tiny individual picture elements, called pixels.Each pixel is a sub-pixel, which is usually divided into red, yellow and blue.

Samsung's smartphones and briefly tried OLED TVS use separate red-green-blue OLED materials to generate sub-pixels.Unlike TVS, LG's phones use an RGB (red, green and blue) cascade structure to produce white light, and then use a color filter to produce red, green, blue and white.

In other words, every subpixel of the LG OLED panel is white.Since each subpixel is the same, the lifetime of the entire panel decays at the same rate.Although the brightness of the screen will get lower and lower over time, there will be no color difference problem.

In addition, the WRGB subpixel also reduces the difficulty and cost of OLED panel production, which is undoubtedly very important for the use of large OLED panel terminals.Currently, no other company besides LG has been able to mass produce large-sized OLED panels.

But the WRGB subpixel advantage is less obvious for devices with smaller screens and faster updates, and the OLED panel market is now firmly controlled by samsung.

3. Pixel size

The pixels on a phone's screen are much smaller than on a TV.But the difference is not in the complexity of production, but in the way they glow.Oleds emit light on their own.LCD itself is not luminous, it needs to rely on independent backlight to shine.

Because OLED panels have pixels that emit their own light, the smaller they are, the less light they produce.Manufacturers can pump more power into it to improve its brightness, but that can cause problems such as battery life, heat, shadowing and overall service life.

To get around this problem, phone OLED panels typically use a "Pentile" or diamond pixel arrangement.In this way, each pixel is no longer a simple square grid composed of red, green and blue sub-pixels, but has fewer red and blue sub-pixels and more green sub-pixels.

This means that on a 2,436-by-1,125 resolution phone screen, there are 2,436 by 1,125 (2,740,500) green sub-pixels, while there are only 1,37,250 blue and red sub-pixels.These red and blue pixels share some of the green pixels, making the rendering more sensitive.

With the exception of samsung's latest plasma TVS, televisions rarely use this arrangement because larger pixels can be detected by the naked eye.But for small, high-resolution displays, this arrangement of seed pixels works well (invisible to the naked eye) and is more efficient.

conclusion

OLED will be the best display technology for some time to come.At present, however, OLED still has shortcomings in image shadowing, service life, brightness, color gamut, energy efficiency and cost.Displays have improved dramatically in these areas over the past decade, and oleds will no doubt get better.With its WRGB design, LG has figured out how to produce OLED panels efficiently.And in mobile phone this, also can have more and more panel manufacturer to join.