After the new generation of models released by Apple in 2017 adopted OLED screens, as more and more mobile phones began to adopt OLED screens, what is the difference between mobile phone OLED screens and LCD screens, which one of OLED screens and LCD screens Better?
To understand the difference between OLED screens and LCD screens, you first need to understand their display principles.
LCD backlight and OLED self-emission
The light-emitting principle of LCD mainly relies on the backlight layer. This part usually consists of a large number of LED backlights. It only has a function of displaying white light, but white light cannot form an image. Therefore, a layer of color is added to this white backlight layer. Film, the white backlight can show color after penetrating the colored film, but the ratio of red, green and blue needs to be adjusted. The light cannot be transmitted through the red, green and blue directly, but the liquid crystal layer can be used to change its color. The voltage of the two poles controls the arrangement of the liquid crystal molecules. In this way, a large amount of light is emitted when the opening and closing is large, and a small amount of light is emitted when the opening and closing is small. In this way, the amount of white light is controlled, so that the red, green, and blue colors can be adjusted. Match it.
OLED does not require a backlight layer like LCD screen, nor does it need a liquid crystal layer to control the amount of light. OLED can emit light by itself, so OLED is like a screen with countless small color light bulb combinations.
Difference between OLED screen and LCD screen
Disadvantages of LCD screens
LCD currently has a fatal problem, that is, the liquid crystal layer cannot be fully closed, so if the LCD displays black, some light will pass through the color layer, and the black of the LCD is actually a gray mixed with white and black. Looking at it is actually gray, which is greatly reduced in brightness, not pure black.
OLED is not the same. When OLED displays black, you can directly close the pixels in the black area to achieve an almost pure black effect.
In addition, due to the presence of a backlight layer, the LCD display also has a light leakage phenomenon, and the LCD cannot completely avoid the light leakage phenomenon.
Advantages of OLED screens
Thickness: Due to the presence of the backlight layer and the liquid crystal layer, the thickness of the LCD is much thicker than that of the OLED, so the OLED screen is very easy to make the mobile phone or display thin, which is a great improvement for the mobile phone. The thinner screen allows you Plug in more components to enhance the experience of other parts.
Bendability: Because of the existence of the liquid crystal layer and the backlight layer, it is impossible for the LCD screen to bend significantly, and OLED can be folded almost as easily as origami. Samsung's curved screen is supported by OLED technology. It should be noted that what is said here is a large bend. The curved screens of desktop computers or LCDs, you can find that the degree of bending is not large. OLED can be folded in half like paper.
Color: Contrast refers to the ratio of white to black. The higher the contrast, the richer the screen color. Because LCD has a backlight layer and black is not pure black, it is difficult to make the contrast high. OLED black does not emit light, so you can directly close the black area. Pixels, so that it is almost infinitely close to black.
Individually lit: when the LCD is turned on, the entire backlight layer is fully turned on, so the LCD is either fully on or fully off, and each pixel of the OLED is independent, so the OLED can light up certain pixels individually, so that On-screen reminders (aways on display), which can greatly reduce the number of times the screen is lit, and indirectly save power.
Power consumption: OLEDs work independently, the bright, the dark, and the off. The LCD is fully backlit regardless of the color it displays, so the LCD is destined to consume power.
Screen response time: The color of the screen is displayed by the pixels. The color change of the pixels takes time. This time is called the grayscale response time. If the grayscale response time is too long, afterimages will appear. Smearing will occur visually. Smearing greatly affects the visual perception. OLED screens have almost no delay, while LCD screens, the smearing is still smearing.
Difference between OLED screen and LCD screen
Disadvantages of OLED screens
Burn-in: OLED defects are also obvious and fatal. LCD screens are inorganic materials, and their aging rate is much slower than that of organic materials. Therefore, the life of OLED organic materials is not as good as LCD, and it is even more deadly. OLED, because each pixel is self-luminous, rather than the entire block is bright like LCD, which will cause the working time of each pixel of OLED to be different, and some pixels display blue for a long time, then its blue The color attenuation will be more than other pixels, and the blue display will become lighter and thinner in the future, so OLED is very prone to burn-in.
However, burn-in is a very long process. Generally, as long as the daily use controls the brightness of the mobile phone below 60%, and the mobile phone screen is not displayed for a long time, a burn-in screen that is visible to the naked eye can appear after 3 years By then, the phone will basically be changed. And Samsung's OLED can be replaced free of charge if the screen is burned during the warranty period.
Therefore, some people who use OLED at low brightness will feel obvious discomfort, so it is best to determine whether you can accept low brightness PWM strobe before choosing OLED screen before making a decision. It should be noted that, in fact, many low-end LCD screens are also PWM dimming, do not think that LCD is all DC dimming.
Low pixel density: The more pixels the screen has, the clearer the screen. However, the arrangement of the OLED screen pixels will cause the two phones to have the same resolution, but the screen clarity will be worse by 1/3. So at the same resolution, the screen of OLED is not as clear as LCD, but the screen of mobile phone is quite clear at present, even 1K resolution OLED is difficult to see the pixels, but if you need to take the horizontal contrast, you need to take root No. 2/3.
The screen is composed of pixels, and each pixel is composed of three red, green, and blue sub-pixels. The screen is developed by adjusting the red, green, and blue ratio of the sub-pixels. The imaging principle of LCDs is based on the white backlight penetrating through the color film. The imaging principle is self-luminous, so each pixel can work independently. LCD inorganic materials, OLED organic materials, so OLED life is not as good as LCD. Because OLED is an organic material, and the pixels work independently, burn-in will occur. The essence of burn-in is that the screen is uneven. The color of OLED is much better than LCD. OLED is oil painting and LCD is watercolor strokes. The OLED screen has almost no smear, and the response speed is fast. OLED screen adopts PWM dimming, and strobe at low brightness will make some people feel uncomfortable. OLED pixel density is not as good as LCD at the same resolution. OLEDs are more power-efficient, thinner than LCD screens, and can be flexed significantly.