The screen is an important part of the mobile phone, just like a human face, and presents a visual picture to the user through the fineness and resolution of colors. At present, the mainstream materials of the screens used in mobile phones are the traditional LCD screen with mature technology and the OLED screen with the latest technology and popularized in the mobile phone industry. So what is the difference between the two screens?
principle
The light-emitting principle of LCD mainly relies on the backlight layer. This part is usually composed of a large number of LED backlights. It has only one function, which is to display white light, but white light cannot form an image, so add a layer of color on this white backlight layer. After the white backlight penetrates the colored film, the color can be displayed, but the ratio of red, green and blue needs to be adjusted. The light cannot be directly penetrated through the red, green and blue, but through the liquid crystal layer to change it. The size of the two-pole voltage controls the arrangement of the liquid crystal molecules, so that the large opening and closing will emit more light, and the small opening and closing will emit less light. This way, the amount of white light can be controlled, so that the red, green and blue can be adjusted. Matched.
OLED does not require a backlight layer like an LCD screen, nor a liquid crystal layer that controls the amount of light. OLED can emit light by itself, so OLED is like a screen with countless small color light bulbs.
Thin and thick
The LCD screen is composed of a backlight layer and a liquid crystal display, which makes the thickness much thicker than OLED. The thickness of the OLED screen can be less than 1 mm, and the weight is also lighter. In this regard, OLED will be lighter than LCD, and mobile phones will feel more textured.
Flexibility
Due to the existence of the liquid crystal layer and the backlight layer, it is impossible for the LCD screen to be bent greatly, and the OLED screen itself is a solid structure without liquid substances, so it can be manufactured on substrates of different materials and can be made into a flexible display that can be bent. OLED can be folded almost as easily as origami. Samsung's curved screen is supported by OLED technology. It should be noted that the curved screens on desktops are still LCDs. You can find that the degree of curvature is not large. OLEDs can be folded in half like paper. Compared with LCD screens, OLED screens have a wider range of applications.
Contrast aspect
Contrast refers to the ratio of white to black. The higher the contrast, the darker the picture. Because LCD has a backlight layer, black is not pure black, so the contrast is difficult to be high. OLED black does not emit light, so you can directly turn off some pixels in the black area. , So that it is basically infinitely close to black.
Power consumption
OLED works independently because the pixels should be bright, dark and dark, and off, no matter what color the LCD displays, the backlight is fully turned on, so the LCD is destined to consume power.
Screen brightness
Since the LCD screen adopts the reverse principle, the brightness of the screen can be easily increased by increasing the brightness of the white light of the backlight. However, because the OLED screen emits light by itself, OLED generally adopts PWM dimming method, which adjusts the brightness by using the visual residual of the human eye to make the light and dark periodically alternate to adjust the brightness. Therefore, it is easy to cause interference from external light. very tired.
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