Personal experience concluded that led technology has been quite mature, there is no room for progress, oled has a lot of room for development oled is the biggest harm to the eyes oled is through the control of the luminous frequency to adjust the brightness, the higher the frequency the higher the brightness. So in the low brightness of the eye damage is high
LED display in fact, the essence of the LCD display, just the use of LED backlight LCD TV, and everyone's mouth LCD display, is the traditional LCD display, the use of CCFL backlighting. The display principle is similar, here I use these two types of backlighting LCD monitors are collectively referred to as LCD display.
The pixels of an LCD display are not self-illuminated, while the pixels of an OLED screen can be self-illuminated. This is the biggest difference between the two types of screens. Now Samsung's AMOLED screen is actually a type of OLED screen, AMOLED can do the rest of the screen display, is thanks to the OLED screen pixels will be self-luminous characteristics.
Because the LCD screen will not be self-luminous, so the LCD screen using blue LED backlight plate, and covered with a red filter, green filter and colorless filter, when blue light through the three filters to form the RGB primary colors. However, blue light can not be completely absorbed by the filter, will penetrate the screen, the formation of short-wave blue light, when human eyes for a long time, close contact will cause damage.
So no matter what kind of screen it is, it will cause damage to your eyesight. We should try to avoid looking at the phone screen for long periods of time, and reduce the amount of time we spend using the phone in a dark environment.
If I really have to pick one of these who hurts my eyes more, I'll go with OLED screens. But unfortunately, Apple, Samsung, and many domestic manufacturers will be using AMOLED screens for their high-end phones.
Modern society, it is difficult for people to get out of the shackles of electronic products, go out to watch the phone, go home to watch TV has become the norm in modern life, not to mention the street full of display screens. But a long time "show" always make people's eyes "nervous". Strained doesn't mean "harmful", but they are bright (which can cause circadian rhythm disruption), one's eyes focus on the same distance for a long time (which can even harm vision), stare for a long time without blinking (which dries out the eyes), and so on. But there are still some elements that need to be understood, because they can make the eyes more tired and even affect the health of the eyes.
As of now, OLED is a better choice compared to LCD screens. Due to its high contrast and the characteristic of light-emitting diodes per pixel, it is more favorable to the health of the eyes in comparison. High contrast, no flickering, and controlled blue emission even at low brightness. That's why most cell phone brands choose it.
It's all about the display, but what's the difference between OLED and LCD?OLED stands for organic light-emitting diode, so the pixels are organic compounds that emit light when electrically stimulated and, perhaps more importantly, don't emit visible light in the absence of electrical stimulation, and LCD stands for liquid-crystal displays, where those liquid-crystal pixels change their polarization state when electrically stimulated. In short, LCD screens use backlighting to illuminate their pixels, while OLED's pixels actually produce their own light. You may hear OLED pixels referred to as "emissive" while LCD technology is "transmissive" for this reason.
Other advantages of OLEDs over LCD screens
Disadvantages of OLEDs over LCDs
The main difference between these two display modes of OLEDs and LCDs is that LCDs are non-emissive displays that need a backlight to illuminate the screen, while OLEDs are emissive displays that emit light on their own.
Factor 1: Blue light, what is the risk of damage to our eyes?Blue light is everywhere, and it's nothing new.
Blue light is everywhere, and it's nothing new. Initially, blue light came mainly from nature - a gift from the sun - and then from digital devices. As technology evolved, blue light became more exposed in people's daily lives (more screens were used).
What is blue light? Sunlight consists of red, orange, yellow, green, blue, indigo, and violet light. When combined, it becomes the white light we see, and each of these has a different energy and wavelength (also known as electromagnetic radiation). Light with relatively long wavelengths contains less energy, while light with shorter wavelengths has more energy, so light at the blue end of the spectrum has shorter wavelengths and more energy. At the other end of the visible spectrum, the blue light with the shortest wavelength (and highest energy) is sometimes called blue-violet or violet light.
Blue light itself is not visible. It is a spectral component of visible light (the part of the visible spectrum with the shortest wavelength and highest energy), corresponding to wavelengths of about 400 to 500 nm.
Blue light: Like ultraviolet radiation, blue light has both benefits and dangers. Sunlight is the main source of blue light, and outdoors during the day is where most of us are exposed to it. What are the benefits of blue light? Blue light is needed for good health :
But there are also many man-made indoor sources of blue light, including fluorescent lamps, LED lighting, flat-screen TVs, and display screens. The HEV light from these devices is only a fraction of the light emitted by the sun. However, the amount of time people spend using these devices and the proximity of these screens to the user's face have led many ophthalmologists and other healthcare professionals to worry about the long-term effects of blue light on eye health, and even permanent damage to the eyes. Almost all visible blue light passes through the cornea and lens and reaches the retina.
This light can affect vision and may cause premature aging of the eyes. Early research suggests that too much exposure to blue light can lead to:
So how do OLED vs. LCD screens compare at this level of blue light? According to a senior vice president of LG, who announced at the IMID Display Business Forum in Korea, LCD screens emit 3.1 times more blue light than OLED screens, based on measurements taken by the company. (The experiment was measured at 120 centimeters from a TV, 60 millimeters from a monitor, and 30 centimeters from a smartphone.)
Similarly, Tsinghua University in Taiwan compared OLED and LCD iPhones for blue light, and the result was that OLED screens were healthier.
So look at blue light rationally, we need natural blue light at the same time, to avoid too much exposure to artificial blue light, if we have to do so (using a cell phone or looking at the screen), then we need to choose from the technical point of view of the OLED screen with less blue light, and of course, the most important thing, pay attention to rest!
Factor 1 of the impact of screens on eye health: flicker, which can cause "eye damage".What is flicker?
What is flickering? Flickering is the change in visible brightness between two cycles on a display, and the faster the switch, the faster the screen flickers. The display will flicker at a very fast frequency that is imperceptible to the human eye. This flickering causes the human pupil to move rapidly from large to small, which causes multiple constrictions and dilations of the pupil, which in turn leads to a variety of eye problems, including eyestrain and eye fatigue. Due to the flicker fusion threshold of the human eye, a sufficiently high frequency reduces the burden on the user. This function of the eye allows blinking light to appear at a high enough frequency as if it were steadily lighting up. When the frequency is low enough, the symptoms described above may occur and cause problems for the user. And there are two ways for the screen to adjust the brightness: pulse width modulation (PWM) or direct current dimming (DC).
Pulse Width Modulation (PWM) is one of the ways to adjust the brightness of a display screen.PWM is considered to be an easy way to control the brightness, and Pulse Width Modulation as the name implies in this technique, the brightness of a display panel can be controlled by varying the width of the light pulses by the time the screen is kept on or off - - When decreasing the brightness, the screen is turned off. -Reduces the brightness when the screen is turned off for a longer period of time than when it is turned on, which is considered to be lower brightness. The human eye is insensitive, and that's because the frequency of the pulses is so high (usually over 200Hz) that the human eye can't notice individual pulses. Instead, the human eye averages the amount of light produced by these pulses. Therefore, it is the ratio of the panel's open and closed states that determines the perceived brightness. Most OLED-equipped screens use pulse width modulation.
At 100% brightness, the light can be seen on all the time. When the brightness is reduced to 50%, the panel switches between on and off at equal intervals. However, when the brightness is reduced further, the screen stays off longer than it stays on. As a result, there is a considerable flickering effect at very low brightness . It has been studied that about 10% of people experience discomfort when viewing a PWM monitor (others are perfectly fine, or have some very mild discomfort). Some people suffer very badly, and the flicker can lead to other health problems.
Direct Current Dimming (DC): DC dimming technology reduces the amount of electricity flowing to the screen. By reducing the brightness, it is possible to reduce the brightness without flickering the screen.DC controls the brightness by isolating the power supplied to the dimming circuit.
By increasing or decreasing either of these two inputs, power = voltage x current, so the voltage and current isolate the power to the display, which increases its brightness. By controlling the voltage and current, we can control the power, and thus the brightness, of the LCD panel. By increasing or decreasing either of these two inputs, the voltage and current are separated from the power supplied to the monitor. This increases its brightness. This technique is mostly used in LCD screens .
PWM is considered an easy (or cost-effective) way to control brightness, but it has the drawback of using pulse-width modulation to adjust the intensity of pixels, which can make the display flicker. Most OLED-equipped phones run PWM at about 250 Hz, so pulse-width modulation is a significant disadvantage compared to DC dimming from an eye-protection level.
PWM OnePlus 7 Pro (0% brightness)
DC dimming OnePlus 7 Pro (50% brightness)
So why don't manufacturers use DC dimming in OLED smartphones? Most manufacturers do so because DC dimming has significant drawbacks; colors are often skewed at low brightness, so the perceived quality of a smartphone display can be significantly degraded at lower voltage levels.
By today, of course, smartphone makers are aware of the possible health issues associated with PWM dimming. But given that PWM flickering actually only affects certain people and the drawbacks associated with DC dimming on OLED panels, recent smartphone makers have chosen to offer it as an add-on. In fact OnePlus, Xiaomi, Vivo, OPPO and even Meizu have introduced options to support DC dimming on their OLED screens, so it's a big no-brainer that this is standard.
For most people, DC dimming won't have any immediate advantages. It's useful if one particularly likes to have the darkest possible screen at night, or if PWM-style lighting makes the eyes snappier, but for nine out of ten people it won't be life-changing. So from that point of view OLED screens won't cause any more eye damage than LCD screens, and if you're worried about it, you can choose a screen that supports DC dimming.
Screen on eye health impact factor 3: contrast, good visual experience to make the eyes easierLCD is a non-luminous display, you need to use a backlight to illuminate the screen, and OLED is a luminescent display can be self-illuminated, so the light of the OLED display can be controlled on a pixel-by-pixel basis. LCD is not possible to do this kind of dexterity, and therefore OLED can not be controlled on a pixel-by-pixel basis. It is possible to achieve this dexterity, so OLEDs have a better display compared to LCD screens.
It can be seen that the darker parts of the LCD are not clear in detail, and the highlights are overexposed, which affects the visual experience and leads to visual fatigue, and the OLED display is better, making it more comfortable for the human eye, and suitable for long-term use, after all, looking at the blur, the eyes are not comfortable.
Writing in the end - to protect the eyes from the technical point of view, but also to develop good habitsAt least at the current level of technology, the choice of OLED screen (including: AMOLED and Super AMOLED and other family members), than the LCD screen more healthy for the eyes. To a certain extent, it can be said that choosing OLED is the same as choosing health.
Please note that technology is not everything, in addition to technology, we should also pay attention to the cultivation of habits, good habits are more important than choosing the right screen:
The above is my humble opinion, welcome to correct, thank you!
Blue light is light with a wavelength between 400 and 500 nanometers. Research shows that the shorter the wavelength, the higher the energy and the stronger the penetration. The peak spectrum of blue light is within the 460~500 nanometer range, with an illumination level of more than 1500lx, and sustained direct sunlight for more than 3 hours, before there is a significant decrease in cellular viability and so on.
LCD screen, that is, liquid crystal display, the advantages of this display are low power consumption, small size, low radiation. With the development and maturity of the technology, the LCD screen is now relatively inexpensive, put into production in some low-end models.
LCD screen its screen pixels can not be self-luminous, the use of compacted DC dimming and blue LED backlighting board, although the damage to the eyes is relatively small, but if a long time to watch and close viewing, it will also cause damage.
OLED screen, that is, organic light-emitting diode display, used in cell phones is known as the "dream display". OLED display technology is different from the traditional LCD display, no backlight, using a very thin coating of organic materials and glass substrate, when there is a current through these organic materials will emit light. These organic materials will emit light when an electric current passes through them. And OLED display screens can be made lighter and thinner, with a larger viewing angle and significant power savings.
Since the OLED screen and DC dimming are not fully adapted, there will be uneven white display, off-color, etc., so you have to choose PWM low-frequency dimming, and therefore, it will cause harm to the eyes.
From a scientific point of view, oled and lcd do not hurt the eyes much! First of all, it is the screen tuning aspect, the light that harms the human eye is called blue light, at present, all the screens that can be listed, the state requires that the blue light filtering rate must reach a safe level, so there is no light damage, so the rest is eye fatigue caused by the damage! The so-called eye protection mode of the cell phone on the market, in fact, the warm light just change the color and brightness of the light, to put it bluntly is not so harsh, but the use of cell phones in close proximity to the role of protection!
Let's start by looking at the difference between oled and lcd!oled is thinner, emits light itself, has more vivid colors, and the black is more pure! Lcd thicker backplane luminous, color saturation is low, the black is not pure enough (because the backplane is still in the luminous), the limit of brightness is higher! To be clear, oled is the current flagship standard, lcd is generally used in the thousand dollar machine, at present, only Huawei flagship with lcd screen! oled there is a pwm dimming, that is, by adjusting the blinking frequency (off, bright, off, bright) to adjust the brightness, due to the lights off at night to play with a cell phone, the majority of people's cell phone brightness will be adjusted to lower, so the screen blinking frequency will be reduced, you can naked eye! feel the flickering! Now the DC dimming is to improve or reduce the circuit power to change the screen brightness, so the screen flicker frequency does not reduce the brightness can be reduced, there is no original night to harm the eyes of the argument!
Finally, to avoid causing myopia, we need to do!
First: avoid prolonged use of cell phones, I use millet 6, also lcd screen, due to writing, prolonged use of cell phones, a year of double myopia increased by more than 100 degrees!
Second: Keep the distance!
The biggest cause of nearsightedness is due to the close proximity of homework and cell phones!
Third:Ensure the presence of ambient light , that is, turn on the light at night to play with the phone, if there is no ambient light, your attention will be highly concentrated, it is very hurtful!
In 2020, there are still people who say that oled hurts their eyes, what hurts your eyes is never your habit of using it, oled will no longer hurt your eyes after solving the pwm tuning, don't believe in the eye protection mode, don't believe in the anti-blue light glasses, it's no use! Use less, don't use or keep a safe distance, the doctor told me, play the cell phone for 40 minutes to stand up and move around, look at the green in the distance, it's very useful for relieving eyestrain! Wish you all a good eye!
OLED is theoretically more harmful to the eyes
From a scientific point of view, no matter whether you look at a cell phone or watch TV, it is not the screen that hurts your eyes, it is the habit of using your eyes.
1. The light source of the LCD screen is LED, OLED itself is a self-luminous light source, whether it is LCD or OLED, the light emitted is in the visible light zone, the light is no difference;
2. Often referred to as the blue light problem, so far, there is no direct scientific evidence that the blue light on the eyes of the hazards; only ultra-short wavelengths can harm the eyes, such as ultraviolet light and even skin
3. The reason why people feel that watching the screen will be bad for their eyes, in fact, the biggest root cause is bad eye habits. Staring at the screen for a long time, or too close, can be harmful to vision. Bad eye habits, see what will hurt the eyes, such as reading books;
4. The brightness of the screen may affect the eyes, do not be too bright or too dark, especially not too different from the ambient light, so that the eyes can not adapt to;
In short, in the topic of eye injury, the screen is not guilty. The technology used for this screen is irrelevant.
OLED and LED are essentially LED, just one is made of organic materials, one is not. And LED light-emitting is to use blue light to stimulate different phosphors to reconcile the different colors of light. And the 400-440nm wavelength of blue light, the strongest energy, the eye damage is also the biggest.
LCD screen luminescence is through the screen backlight luminescence, the backlight layer consists of a small LED light source. It then passes through 5 layers of media and is mapped onto the screen.
OLED screen is through an organic self-luminous material, the screen is self-luminous. It's just that OLED has only 2 layers of media from the light source to the screen.
Theoretically, the more number of media the light penetrates, the more energy is lost.
In addition, OLED also exists PWM low-frequency dimming, a little more damage to the eyes (detection of stroboscopic method is: cell phone brightness is adjusted to 20% below the cell phone screen to take a picture, check the photo there is no black and brightness of the stripes, if there is, there is stroboscopic,).
What makes no sense is that amoled has less blue light than lcd, and years ago Samsung confidently outlined on the amoled website that amoled has 50% less blue light than lcd
Though your title is pretty clear, I'm going to bar the door on the fact that moderate viewing isn't going to do a lot of damage. Specifically for the two types of screens, they also don't work the same and dictate that their combined experience isn't the same.
The LCD screen is illuminated by the backlight assembly located behind the screen, illuminating the liquid crystal in front of it, and by loading it with different voltages the liquid crystal is twisted in different directions, and through the gaps in the liquid crystal's twisting the light comes through, and so we see the image on the screen. As long as we need the screen, the backlight assembly will always be on until we turn off the screen. If we need to dim the screen, we simply dim the light by reducing the voltage and current to the backlight assembly, which in turn dims the entire screen.
The OLED screen is actually made up of small light bulbs that can be switched on and off independently to emit light. It doesn't need a backlight layer. That's why OLED screens look so colorful. But if we need the screen to darken, the OLED screen can not darken, because if the change, then the whole screen color will be distorted to make the senses down, so the OLED screen uses another technology to make us look darker, that is, by adjusting the switching time of the light bulbs on the screen to make us feel darker. It's like when you blink your eyes rapidly.
It's basically impossible to get to 100% brightness on a screen most of the time we use it, so an OLED screen is actually flickering all the time it's just not very perceptible to the naked eye. In addition, the pixel arrangement of OLED screen is not horizontal and vertical. So when displaying certain images may seem to have a halo feeling. So theoretically, OLED screens are more irritating to the eyes. But it's not the same for everyone, and it's not absolute.
The only shortcoming of the OLED screen is that prolonged viewing is harmful to the eyes, so this is the benefit of the LCD screen, the following is the difference between the two a. What is LCD and OLED
lcd is a display that works by controlling the light-emitting diodes in the semiconductor, which is generally made up of multiple red lights;
The working principle of oled screen is driven by a stable voltage, holes and electrons from the anode and cathode injected into the hole transport layer and electron transport layer, and then each move to the light-emitting layer, the two after the encounter will form an exciton, the exciton will make the light-emitting molecules in the light-emitting layer activated, so that the visible light is emitted;
Second, the difference between the two
First, in the color domain Above, OLED LCD screen can display endless colors, and also not affected by the backlight, pixels in the display of the all-black screen is very advantageous, LCD LCD color gamut on the current between 72% to 92%, and led LCD screen color gamut in more than 118%;
Second, in the price above, the same size of the LED LCD screen than the LCD screen is more than one times more expensive, OLED LCD screen is more expensive;
Third, in terms of technological maturity, because LCD LCD is a traditional display, so the maturity of the technology is much better than OLED LCD, LED LCD, for example, the display response speed, OLED LCD, LED LCD and LCD LCD performance compared to a certain gap.
Fourth, in terms of display angle, OLED LCD is much better than LED LCD and LCD LCD, specifically for the LCD display viewing angle is very small, while the LED LCD in the hierarchy and dynamic performance of the top poor, in addition to the depth of the LED LCD screen is not good enough.
Figure 3 shows the Apple 8p (lcd) on the left and the Apple X (oled)
.