What are the main indicators to buy LCD?
Author:He Xiaoshu Time:2021-07-21 11:20 Browse(306)
In spite of this, liquid crystal still has seven performance indexes which are essentially different from CRT. 1、 The resolution of LCD is the same as that of CRT, and the resolution of LCD is also one of the key indicators of the display. Generally, the larger the screen is, the easier the resolution is to be improved, that is, the lattice of LCD can be made thicker. In today's popular applications, LCD is basically an active matrix display with a resolution of 640 * 480600 * 8001024 * 7681280 * 10241920 * 1600 and so on. 2、 Compared with CRT, LCD can't detect its flicker in the visual range because of the matrix display technology/
However, LCD still has seven performance indicators which are essentially different from CRT.

What are the main indicators to buy LCD?

1. The resolution of LCD is the same as CRT.
the resolution of LCD is also one of the key indicators of display. Generally, the larger the screen is, the easier the resolution is to be improved, That is to say, the dot matrix of LCD can be made relatively thicker.
in the current popular application fields.
LCD is basically an active matrix display with a resolution of 640 * 480600 * 8001024 * 7681280 * 10241920 * 1600, etc.
secondly, the refresh rate of LCD is compared with that of CRT.
because of the matrix display technology adopted by LCD, its flicker display can not be detected in the visual range, Therefore, this index is no longer the key factor, but the cathode ray technology used in CRT is not. If the refresh rate is too low, it will directly affect people's vision and even radiation. Generally, the refresh rate of LCD is about 60Hz and 75Hz.
Third, the point distance of LCD is summarized.
the point distance of CRT is quite high at 0.297 and 0.30, but LCD is not, The dot matrix can be 0.30 * 0.30, 0.297 * 0.297, 0.264 * 0.264 or higher.
of course.
the smaller the dot distance is, the smoother the display effect will be, and the higher the contrast and saturation will be.
IV. The contrast of LCD is the same as that of CRT.
contrast also plays a decisive role in the LCD display effect. Generally, it has 150:1200:1250:1300:1400:1 and so on.
v The response time of LCD is delayed due to the transmission time of LCD matrix imagingTherefore, it has the response time parameter, and the response time has become the most considered factor in the application field of liquid crystal. Generally, it is better to be about 15ms. If the time parameter is too large, it is easy to make the display content appear mosaic.
6 The brightness of LCD is due to the fact that all popular LCDs in the market need to be equipped with liquid crystal backlight externally.
the number and quality of backlight will directly affect the whole display brightness of LCD. The higher the brightness is, the thinner the backlight tube will be. At the same time, the number of backlight may be more. Under the condition of equal brightness and backlight number, the brighter and thinner the backlight will be.
7 In addition to the viewing angle of the LCD blank, the polarizer on the surface of the LCD also has the viewing angle in the LCD imaging system.
therefore, the viewing angle becomes a crucial link in the LCD furnishings.
when the LCD is placed in the right corner, the user can't see clearly.
vice versa. Therefore, the larger the viewing angle of the LCD, the better the viewing angle, The working principle of liquid crystal display (LCD) is completely different from that of traditional CRT display.
its most basic display component is liquid crystal material.
generally speaking, liquid crystal display is a layer (or multi-layer) of liquid crystal material sandwiched between two pieces of glass.
there are several light tubes behind the glass that continuously emit light, The liquid crystal material changes its light transmission state under the control of the signal, so you can see the image in front of the glass panel.
the dot distance and the visible area of the liquid crystal display refers to the space between each pixel of the liquid crystal display.
at present, the standard dot distance of the mainstream 15 inch liquid crystal display products is generally 0.297mm, and the corresponding resolution is 1024 × 768.
The visible area of LCD is "real". "Generally, there is such a reference: the visible area of 15 inch LCD is close to that of 17 inch CRT.
the most common screen defect is white spot or black spot.
the identification method of black spot is to turn the whole screen into white screen.
then the black spot has no place to hide; The white dot is just the opposite, turning the screen to black, The white dot will show its original shape.
generally, the display screen with no more than 3 bad spots can be considered as qualified.
but the price is very different from that without bad spots.
therefore, users must pay attention to choose the product without bad spots when purchasing LCD.
if they can't see any white dot, black dot or bad spot.
they can only choose the big brand with guaranteed quality.
brightness display Generally, the brightness of the indicator is in CD / m2 (lumen per square meter).
the higher the brightness, the stronger the anti-interference ability of the display to the surrounding environment, and the brighter the display effect.
this parameter should be at least 200 CD / m2.
it is better to be above 250 CD / m2.
the higher the brightness of CRT display.
the greater its radiation, The brightness of the LCD is obtained by the backlight of the fluorescent tube, so there is no negative impact on the human body.
contrast refers to the brightness ratio of the bright area and the dark area of the LCD under the specified lighting conditions and observation conditions.
contrast is a parameter that directly reflects whether the LCD can reflect the rich color scale.
the higher the contrast is, the higher the contrast is, At present, the nominal value of LCD is 250:1 or 300:1.
high end products are 400:1 or 500:1.
here we want to explain. the viewing angle LCD belongs to the backlight display device.
the light emitted is provided by the backlight behind the LCD module, This will inevitably lead to the LCD display has only one best viewing angle - face up.
when you look at it from other angles.
because the backlight can penetrate the adjacent pixels and enter the human eye, it will cause color distortion, The range of non distortion is the viewing angle of LCD.
the viewing angle of LCD can also be divided into horizontal viewing angle and vertical viewing angle.
the horizontal viewing angle is generally larger than the vertical viewing angle.
at present,
as long as the horizontal viewing angle reaches 120 degrees, it can meet the application needs of most users.
response time refers to the response speed of LCD for input signal Generally speaking, it can be divided into two parts: tr (rise time) and TF (fall time).
the response time refers to the sum of the two parts. The smaller the response time, the better, At present, the standard response time of LCD is about 25 ms.
however, there are a few models that can achieve 16 Ms.
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