The debate between OLED screens and LCD screens has been going on for a long time, but now, OLED screens can be said to have won a big victory. Although too many people shout the slogan "LCD will never be a slave", it obviously cannot stop the popularity of mobile phone manufacturers. The general trend of OLED screens. From a display perspective,corning ces 2024 OLED screens have better brightness, color gamut, color accuracy, and richer colors than LCD screens due to their self-luminous properties. But we know that everything has two sides, and it is impossible to have only advantages without disadvantages. The most obvious shortcoming of OLED screens at present is the unavoidable low-light flicker, which is more harmful to the eyes.

So, what causes "low-light screen flicker" on OLED screens? This has to be explained from the different structural principles and light-emitting mechanisms of OLED screens and LCDs:

1.OLED screen

The OLED screen is also called an organic light-emitting display. Its distinctive feature is that it emits light itself without the need for a backlight, so it can be made very thin, light and bendable. The full-screen screens with narrow chins currently on the market take advantage of this OLED screens are made of bendable features. Each pixel of the OLED screen can be assigned to three colors: red, green, and blue. These three colors correspond to the most basic three primary colors. Other colors can be displayed by adjusting the ratio of the three primary colors.

It is due to the characteristics of self-illumination that OLED screens usually use PWM dimming when controlling brightness. This dimming method is different from the DC dimming of LCD screens. It does not need to increase the power of the circuit,oled panel manufacturers but uses The pixels of the screen are constantly and rapidly switched on and off, so that the screen is always in the process of alternating on and off. When this process is fast enough, our eyes will feel that the screen is always on and cannot be distinguished by the naked eye, but when you turn it on When the brightness of the mobile phone screen is lowered and the camera is used to shoot in professional mode, you will find that it keeps flashing and the screen is also bright and dark.

Under such low brightness and low power consumption, the OLED screen's flicker frequency will be much lower than DC dimming, usually between 215Hz and 250Hz. Like Apple's iPhoneX, its highest flicker frequency is only 240Hz. .

The lower the stroboscopic frequency, the greater the damage to the eyes. According to IEEE (Institute of Electrical and Electronics Engineers) literature, the stroboscopic range with low health risks should be above 1250Hz. OLED screens are obviously far from meeting this standard. . So, how does the LCD screen, which is said to be more eye-friendly, perform?

2.LCD screen

The LCD screen is also called a liquid crystal display. It is generally used in color TVs and computers at home. Its characteristic is that it does not emit light itself and needs to be illuminated by the underlying white backlight panel. The general steps are as follows :

The backlight panel emits white light -> enters the three primary color films of red, green and blue -> enters the liquid crystal layer -> the liquid crystal layer adjusts the ratio of red, blue and green -> outputs various colors

Compared with OLED screens, the structure of LCD screens is relatively complex, and due to the additional backlight layer and liquid crystal layer, its thickness will be much thicker than OLED, its power consumption will be higher than that of OLED screens, and it cannot be bent.

It is precisely because of these characteristics that LCD screens generally use DC dimming to adjust the brightness. This dimming changes the brightness of the screen by increasing or reducing the output power of the circuit and controlling the brightness of the backlight. Its stroboscopic effect Frequencies can often reach several thousand Hz, far exceeding health standards. Therefore, LCD screens generally do not experience low-frequency screen flickers unless they are in extreme circumstances, and the damage to the eyes is much lower than that of OLED screens.

In addition, in addition to the advantage of screen flicker, at the same resolution, the LCD screen will have a more delicate display effect than the OLED screen. This is due to the different pixel arrangements of the two screens. The LCD screen uses the traditional RGB (red, green and blue) standard arrangement, while the OLED screen uses the Pentile RGB arrangement. In this arrangement, the green pixels are twice as many as the red and blue pixels. The actual pixel density of the screen ( ppi) is about 30% off.

Although the OLED screen has the disadvantages of screen flicker and lack of detail, we cannot ignore its advantages. It is thin and bendable, supports under-screen fingerprints, and has a more vivid and full display effect, which LCD screens do not have. The advantage of LCD screens being more eye-friendly is unmatched by OLED screens. Although some manufacturers have introduced DC-like dimming, eye protection mode and other targeted methods to address the screen flicker problem of OLED screens, in the end they can only Treating the symptoms but not the root cause. If you want to make your eyes healthier, then the best thing to do is to choose a suitable mobile phone with an LCD screen and reduce the time you use the screen.

Related articles:

Which one is better, OLED or LED?

Which one is the future, LCD or OLED?

What are the advantages and disadvantages of LCD screen and OLED screen?

Posted by: lonelygoose at 04:30 AM | No Comments | Add Comment
Post contains 965 words, total size 7 kb.