- Post Publish: 2022-03-10
- Categories: Knowledge
- Updated:
Some differences between OLED and LCD.
Some differences between OLED and LCD. - Table of contents:
At present, the mainstream screen display displays complete images by piecing together small color blocks one by one. We can see the difference between them through the display methods of OLED and LCD screens:
LCD screen
The reason why the LCD screen can be displayed is that it has a luminous board, which is called a backlight board in LCD terminology. The backlight board has only one function, which is to emit white light.
We know that different colors are formed by the mixture of three colors of red, green, and blue. Only one white light can’t display different colors, so we add a colored transparent thin plate above the backlight board.
In order to adjust the brightness of different lights of red, green, and blue to display different colors, the designer added a polarizer between the backlight board and the thin plate to control its opening and closing degree by changing the voltage to change the amount of white light passing through (or a layer of liquid crystal material, by changing the voltage to change the arrangement of molecules inside the liquid crystal material to control the amount of white light passing through). In this way, different colors can be displayed.
It sounds like LCD is good, but LCD has a fatal defect at this stage, that is, LCD cannot be completely closed, that is to say, it cannot completely stop the white light from the backlight board.
When it shows black, it only adds a black transparent film on the basis of white light, which is not pure black at all.
And because the LCD has a backlight board, the white light emitted by the backlight plate is easily exposed from the gap between the body and the screen, which is the phenomenon of light leakage that we often call, and it looks more obvious after turning off the light at night.
Light leakage is an inevitable defect of LCD, but the degree is different. At the same time, light leakage is unique to the LCD screens. Why does OLED screen not have a light leakage phenomenon?
OLED screen
The structure of OLED is different from that of LCD. OLED does not have the structure of a backlight board, which is composed of small bulbs that can display the three primary colors of red, green, and blue. And it is because of this that when OLED displays pure black, it only needs to close the pixel point. Without a backlight board, OLED will not leak light, which makes up for the defect of LCD.
Advantages of OLED
No light leakage:
This has been introduced above.
High contrast ratio:
The so-called contrast ratio is the measurement of different brightness levels between the brightest white and the darkest black in the image. The larger the difference is, the higher the contrast ratio is.
As mentioned above, because LCD cannot display pure black, OLED screens are generally higher than LCD screens in contrast.
Strong flexibility:
Because LCD has a backlight board, LCD cannot be greatly bent, but OLED can. For example, the popular folding mobile phones and waterfall screens in recent days all adopt OLED screens. It should be noted that LCD cannot be bent, but cannot be greatly bent.
Small thickness:
Compared with OLED, LCD has a more complex structure. When it is manufactured, LCD is naturally thicker than OLED. However, in today’s internal space of mobile phones, one point can be saved and more space can be left for the battery to look good.
Power Saving:
LCD lighting depends on the backlight plate, so in order to light up the LCD, the whole backlight plate must be lit up. OLED works independently, so OLED is bound to save more electricity.
It is also because of this feature that the off-screen clock is popular. Only a few low brightness pixels are used to complete the function of displaying time, and the power consumption is very low.
Drag shadow:
When LCD switches different colors, it is conducted through the polarizer, while OLED directly controls each pixel point and directly issues a command to change its color, which causes LCD to be unable to quickly change from one color to another, thus leading to the residue of the picture. This phenomenon is called drag shadow.
Drag shadow is also an inevitable problem for OLCD, but it is only different in degree.
Advantages of LCD
After talking about the advantages of OLED for so long, we can see that the advantages of OLED are very obvious, but does LCD really have no advantages at all? Of course not, otherwise LCD would have been completely eliminated!
Long life span:
As a backlight plate made of organic materials, its life span is much longer than that of the self-emitting OLED. With the passage of time, the difference in the service time of each small bulb of OLED will become larger and larger, which leads to the obvious difference of aging degree between small bulbs, and the residual caused by uneven screen aging is called screen burning.
The screen burning phenomenon was very obvious on OLED in the past few years. Due to the technological breakthrough in the past two years, the screen burning phenomenon has improved, but it is still unavoidable, which only makes the occurrence time of this phenomenon longer.
No stroboscopic:
Above is some simple knowledge about the difference between OLED and LCD.
Unmarked pictures come from Internet, and source: zhihu.com
