info@panadisplay.com
Which Is Better For LCD And OLED?

Which Is Better For LCD And OLED?

Dec 18, 2017

LCD and OLED are two completely different display technologies, which are now widely used in the field of smart phones and flat TV. In addition, there are old technology like this once in plasma TV field, but it has gradually disappeared. At present, most users are only in the two display select panel products, and if you do not know how to choose, then we will tell you some basic knowledge, and tell the difference between your LCD and OLED two, and tell you in the middle of demand and how to pursue a balanced budget.


LCD display screen

The whole LCD is called a liquid crystal display, which creates a variety of colors based on white light passing through a color filter. White light will form basic colors such as red, green and blue after passing, and control the color of pixels by controlling the passing rate of each pixel by current.

In the LCD display, want to completely mask black white display, is a very difficult thing, or always how many have some light leakage phenomenon, and this is why most of the night on the screen can not show the real reason of black.


Passive and active matrix

The LCD display was used in the 80s last century and was first used on "portable computers". These screens have a "matrix" array of pixels, and are divided into active and passive matrices. The technology of the active matrix is more advanced and allows more detailed control, and has faster switching speed than the passive matrix. First, the active matrix technology was introduced on the screen of TFT affinity matrix, but many variant technologies appeared later, but basically they all work the same principle, and the cost is decreasing.


LCD backlight

All LCD displays need some form of white backlight, and back light technology is progressing as time goes on. The purpose of the backlight is to be brighter, even more uniform, and to make the display smaller, thinner and lighter.

The LCD screen originally used the CCFL backlight, and now it has changed to the LED backlight. In addition, some LCD screens are not only using white backlight, but also will achieve some more difficult purposes through combination of LED backlight and white light.

Although the backlight comes from the liquid crystal layer, most of the LED backlight source comes from the edge of the screen, usually at the border, and this design can make the screen thinner and flatter.

The TV products usually don't have such high requirement for thickness, so they will use the uniform uniform backlight. This kind of light can be more uniform, and it can also adjust the backlight for the part.


LCD IPS and PLS

The full name of IPS is In-Plane Switching (also called Super TFT), a variant of the LCD display. IPS can provide better color accuracy and a broader perspective. The ordinary LCD display usually displays the best fresh fruit only in front of the screen.

IPS can completely copy the color effect in the range of 178 degrees without any effect. And that's why most of the touch devices are starting to use the IPS screen. It's true that the traditional LCD displays have a strange effect when they are pressed with their fingers. I believe everyone has a similar experience.

At the same time, IPS technology itself has more improved versions, including Super-IPS (S-IPS), Advanced Super IPS (AS-IPS), IPS-Pro, etc. Although not all IPS panels have the best effect, but generally speaking, IPS is better than traditional LCD panel.

PLS (Plane Line Switching) is also a technology similar to IPS, a patent for the Samsung Corp. Samsung said that such a screen has better brightness and more efficient production costs, but it can not be determined at the moment, because the absolute leader of the IPS display is LG.


LCD+ quantum dots

Quantum dots is a technology that can improve the color and tone of LCD display. Semiconductor nano quantum dots can absorb specific spectrum, which is usually determined by their size. This property can be used / created better colors, such as red, green, and blue, which will give the user a more saturated color.

Quantum dot technology has recently been in hot pursuit of the market, and even have the strength and the latest OLED technology portal. However, quantum dot technology is present only in high-end LCD TV, but it is believed that it will become popular over time.


OLED Screen

The full name OLED organic light emitting diode, each pixel itself will light, without the need for a separate backlight or color filter. Each OLED pixel can allocate three colors of red, green, and blue, and now the manufacturers add yellow, but the principles are the same.

Because of the special properties of OLED, it is not like LCD to cover the light source in the display of black, only the pixels are extinguished and no light can be illumined. And that's why the OLED display can bring real "black". OLED has a very deep black and high contrast, and even if it is compared to white and other elements, it can even have an amazing effect.

OLED was first unveiled in the laboratory in 1987, and it has become a very popular technology in the field of smart phones. Because the OLED screen is less than the LCD screen, the thickness of the one is thinner, which is particularly important for mobile devices. For TV products, whether or not to choose OLED products depends on the preferences of the users. But we think the ultra thin OLED is not a decisive advantage for LCD TV.


One to one contrast

Because of the difference of basic attributes, we can look at the direct contrast between two different principles of imaging technology and give the user a more intuitive feeling.

Black level: OLED victory

The level of black position refers to the extent to which the picture can be "black" when it displays the deepest color. Because LCD, DLP, or projection techniques are all dependent on filtering or shielding the white light, it is very difficult to show real black. In fact, it can be said that the LCD screen cannot bring true black, after all, the shielding effect is good, there will still be some leakage phenomenon. On the other hand, because of the principle of self luminescence, OLED can bring true black as long as it closes the luminescence mechanism.

Contrast: OLED victory

Contrast refers to the difference between the brightest white and the deepest black, while LCD has an advantage in brightness (especially in HDR mode), while OLED has the deepest black. On the whole, the OLED display usually has a higher contrast, because the advantage at the black level will magnify the difference.

Perspective: OLED victory

Perhaps the best IPS and OLED display screen can be comparable in the angle of view, but most of the LCD display are not IPS so good performance (especially TV and intelligent mobile phone), so in addition to the IPS display panel at the top of LCD, compared with OLED, the visual angle is to slightly worse. In front of OLED TV, the audience can see the content on the screen with high quality, no matter what the audience is sitting at that angle.

Color gamut: OLED victory

From paper parameters, the advantage of OLED in the color gamut is not obvious, mainly because the LCD panel has now introduced quantum dot technology. Basically the best LG OLED TV and Samsung's top quantum dot LCD TV are different in the color gamut.

But usually the best LCD TV is comparable to OLED, so overall color domain performance is better than OLED.

Brightness level: LCD win

Since LCD TV usually uses a separate backlighting, it can generally bring better brightness. In reality, the best LCD and OLED have a gap of about 400NIT in brightness, and in general, LCD is better at the brightness level. You know, higher brightness will make the screen better visuals in the outdoor or daytime rooms.

HDR

The HDR mode can increase the brightness by 1000 to 10000 NIT, and the OLED TV with the HDR function can be compared to the LCD TV at this time. However, some SONY LCD TV can increase the brightness to 1000 to 1300 NIT, so in general, the LCD TV is still a little more bright.

Color uniformity: OLED victory

The ability to display various colors on a flat in a unified way is a very important indicator. As the backlight of the LCD screen usually comes from the edge, it is more general on the uniformity of the radiation. If the backlight can be evenly distributed behind the screen, the discrete backlight can bring a better effect.

On the other hand, OLED is much better in this respect, because every pixel is able to light itself, so it does not need the light source to spread. In real life, even if the OLED display is not completely unified, and even a flexible OLED appears, it is still better than LCD as a whole.

Power consumption: LCD win

At the same level of brightness, LCD consumes less energy than OLED. This is a problem we have to face. For mobile devices, higher brightness means better visibility in the outdoors, while TV products only need enough brightness in the daytime.

On the other hand, the power consumption of the OLED panel depends on how many pixels, so the higher resolution OLED screen is more power consuming.

Cost efficiency: LCD win

At present, LCD is the lowest cost display mode, but OLED technology is constantly optimizing with continuous progress and time. At present, it is not clear that the specific cost rate is not clear, but the future OLED technology is constantly improving and will eventually be optimized and reduced in cost, which is finally comparable to that of LCD.

Summary: OLED is best, but it needs to be developed

In general, OLED has won a great victory in the contrast of image quality, so the future can be said to be a trend of future display technology. But at present, OLED is still limited to production costs, and the size has also encountered bottlenecks. Unless you have special requirements for this particular parameter, OLED is stronger in most of the display parameters than LCD.