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Apr.2020 22
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6 Misunderstandings In The Selection And Purchase Of LCD Monitors
Introduction
When we choose and buy lcd monitors, we will inevitably be induced by merchant advertisements. Bright matching pictures, with seemingly incomprehensible parameters, it is easy for consumers to associate the two, and then fall into the endless whirlpool of
Details
When we choose and buy lcd monitors, we will inevitably be induced by merchant advertisements. Bright matching pictures, with seemingly incomprehensible parameters, it is easy for consumers to associate the two, and then fall into the endless whirlpool of competition parameters. So, how should we correctly understand these parameters? Next, let's sort out the "top six" cognitive misunderstandings when choosing and purchasing monitors.
Myth 1: will high-energy shortwave blue light cause irreversible damage to human eyes?
"Blu-ray hazard" is a new term that has emerged in recent years. Tracing its source is actually related to the transition of lcd display backlight from CCFL to LED. So the question is, does 400-450nm's high-energy shortwave blue light really cause irreversible damage to eyesight? High-energy blue light has not been clinically proved like ultraviolet damage. Similar blue-light experiments have only proved to be harmful to poor animals such as mice, rabbits and monkeys. As for the harm to human beings, there is no definite clinical basis in medicine. Naturally, there will be no standard "blue light filter" products.
What is really harmful to eyesight is high brightness and eye time. Some consumers think that if they buy a filtered blue light display, they can not pay attention to the proper use of their eyes, which is wrong. Of course, "filtering blue light" can indeed reduce the brightness of the lcd display, thus playing a certain eye protection effect, but the main body of the harm has changed, so there is no need to talk about shortwave blue light.
Myth 2: the screen refresh rate 60Hz flashes 60 times per second?
Along the way from the old CRT monitor, we used to assume that the 60Hz lcd monitor flashes 60 times per second, which is wrong. The pixels in the lcd display work normally and change only when the new information is changed. So even if it is reduced to the refresh rate of 1Hz, there will be no splash screen phenomenon, so you can rest assured. So what are the factors that determine whether the lcd monitor flashes or not? The answer is dimming mode, and the common dimming modes are PWM dimming and DC dimming. PWM dimming will cause a frequent flicker impact on human eyes, which will also cause visual fatigue. However, DC dimming does not flicker, which is better for eyes than PWM dimming.
Myth 3: the greater the dynamic contrast, the better?
The dynamic contrast of the lcd monitor ranges from 20 million: 1 to 80 million: 1. If you are obsessed with this parameter, it is not worth it, because "dynamic contrast" itself is a hype concept. The really useful contrast parameter is called "static contrast", which refers to the ratio of the brightness of the brightest (white) to the darkest (black) at the same point on the screen. The higher the static ratio, the more layering between light and dark, the stronger the hierarchical sense of the picture, and the better the black performance. Generally speaking, the static contrast can be used to simulate the real scene when the static contrast ratio is 1000:1. Of course, some lcd monitors can achieve the static contrast ratio of 3000:1.
Myth 4: e-sports display is more high-end than ordinary display?
In recent years, the popularity of the e-sports industry has given birth to the e-sports display market. When players look at the high price of e-sports monitors, they will have the impression that e-sports monitors are more high-end than ordinary monitors. In fact, they are just different uses. It doesn't mean who is more high-end than who.
Myth 5: monitor interface is not important, it is not possible to buy an adapter?
There are four common display interfaces: VGA interface, DVI interface, HDMI interface and DP interface. VGA interface is the video interface of the old computer, it can only transmit analog signals, while video cards and monitors use digital signals, so using VGA interface transmission is equivalent to converting digital signals into analog signals and then converting back to digital signals, which will cause signal loss and blurry display. Now many displays have gradually failed to support the VGA interface, and this interface will eventually become a thing of the past. There are two kinds of DVI interface, one is 29-pin, the other is 25-pin, there is basically no difference between the two. All the signals transmitted are digital, and there is no loss of the signal. HDMI interface can transmit not only digital signals but also audio signals. DP interface is the successor of VGA interface, it can also transmit digital signal and audio signal at the same time. The future transmission interfaces will be dominated by HDMI and DP, and VGA and DVI interfaces will be gradually replaced. If you want to buy a monitor that doesn't have a HDMI or DP interface, there are basically two possibilities: one is that it's an old monitor, and the other is that it's a low-end display.
Myth 6: buy a TV as a lcd monitor?
Today's televisions are big and cheap, so many friends think of buying a TV to act as a monitor. From a technical point of view, it is much more difficult to build a monitor than to build a TV, which makes the display several times more expensive than the TV set at the same size. Moreover, the difference between monitor and TV is far from that simple.
First of all, the brightness is different. TV needs to watch from a long distance, so the brightness of TV is more than twice as bright as that of the monitor.
The second is the loss of gray scale. Ordinary 8-bit LCD can display 256grayscale and 16.8 million chromatic number. However, when the TV is connected to the mainframe, it can only display 160236 of the 256 grayscale. The root cause is that the computer's gray scale output standard does not match the TV's gray scale range. The loss of grayscale means that the color is lost and the picture is darkened.
Finally, there is the use of experience. When playing games on TV, there will be a delay in mouse shaking, which needs to be adjusted, and the delay problem will also lead to the shadow of the picture.
So for the sake of eyes and mood, let's buy a lcd monitor honestly.
