Some differences between OLED and LCD.
Some differences between OLED and LCD. - Table of contents:
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.
Advantages of OLED
No light leakage:
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.
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.
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.
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.