Worauf Sie bei der Verwendung des LCD-Bildschirms achten sollten:
1, refresh rate
Refresh frequency is the vertical scanning frequency (field frequency) of the display. It refers to the number of times the electron gun scans the entire screen per second, in Hz (hertz). For CRT monitors, the image displayed on the CRT monitor is composed of many phosphor dots. Each phosphor dot emits light under the impact of an electron beam. However, the time for the phosphor dots to emit light is very short, so there must be constant electron beam refreshing. Phosphors are used to make it glow continuously, and only when it is refreshed fast enough can the human eye see a continuous and more stable picture, will not feel the flicker and jitter of the picture, and the eyes will not be easy to fatigue. Therefore, the refresh rate of the CRT display is not lower than 85Hz at the relevant resolution to make people look more comfortable.
Compared with the problem of screen flickering when the CRT monitor divides the screen into several "scan lines" for refreshing, the LCD produces images not through the electron gun scanning, but controls the brightness and darkness by controlling whether the light is transmitted, so the refresh of the LCD is correct The entire picture is refreshed, and the LCD will not flicker even at a lower refresh rate (such as 60 Hz), and the image is stable. Therefore, there is no need to increase the refresh rate when adjusting the LCD, just use 60Hz (1024768 resolution)/75Hz (12801024 resolution) or "default display device".
LCD
2, the number of colors
As you all know, the current mainstream CRT color monitors all support 32-bit true color, but not all LCDs. At present, most entry-level LCDs on the market use 6-bit LCD panels, which can only display 262144 colors (646464=262144), while only 8-bit panels can display 16777216 colors (256256 256=16777216).
Therefore, when adjusting the entry-level LCD with a 6bit panel, the display "color" can be adjusted to "enhanced color (16-bit)" to meet the demand, so as to avoid the graphics card calling more video memory to support high color, which will cause waste.
3, viewing angle
The viewing angle of the display refers to the maximum angle at which all content on the screen can be clearly seen from different directions. The visual angle of the CRT display can theoretically be close to 180 degrees up and down/left and right. Since LCD uses light transmission to display images, the viewing angle of LCD is smaller than that of CRT displays-in LCD, direct and oblique light will penetrate the pixels in the same display area, so from an angle greater than the viewing angle When you look at the screen, you will find that the image has ghosting and discoloration.
The horizontal (left and right) viewing angle of the liquid crystal displays on the market is generally above 120 degrees, while the vertical (up and down) viewing angle is slightly smaller, generally above 100 degrees. In order to obtain a better viewing angle in use, in addition to adjusting the sitting posture or the angle of the display to face the LCD as much as possible, the brightness of the LCD can be appropriately increased, which can also maximize the available viewing angle of the LCD.
4, response time
Signal response time is the response delay of the liquid crystal cell of the liquid crystal display. It refers to the time required for the liquid crystal cell to transform from one molecular arrangement state to another molecular arrangement state, that is, the speed at which the screen turns from dark to bright or from bright to dark. The response time is as short as possible. It reflects the speed at which each pixel of the liquid crystal display responds to the input signal. Generally, the response time is divided into two parts: rise time and fall time. The sum of those shall prevail, not one way.
The current mainstream LCD response time can be within 25ms, and the new mainstream models are mostly between 8ms and 16ms. 25 milliseconds=1/0.025=display 4{{10}} frames per second, which can already meet the needs of video playback; 16 milliseconds=1/0.016=display 63 frames per second, which can meet the needs of most games; 12 milliseconds= 1/0.012=Display 83 frames per second, but due to the limitation of LCD refresh rate of 60/75Hz, 12ms generally cannot reach 83 frames per second. Therefore, the current mainstream LCD monitors can fully meet the needs of ordinary users for DVD playback and games.
5. Resolution
As long as the line frequency and bandwidth are sufficient, traditional CRT monitors can generally stably support full-screen and stable display of all pictures within the resolution it supports. The pixels of the LCD are fixed, so the LCD only has the best resolution (the maximum resolution, the best resolution of 15-inch LCD is 1024768, the best resolution of 17-19 inches is usually 12801024) In order to show the best image.
When LCD is displayed with low resolution, it is generally carried out in two ways:
① Centered display: For example, when an 800600 screen is displayed on a screen with the best resolution of 1024768, only the 800600 pixels in the center of the screen are displayed, and the other pixels remain dark.
②Expanded display: When displaying a picture with a resolution lower than the optimal resolution, each pixel is expanded to adjacent pixels for display through a differential algorithm, so that the entire picture is stretched and expanded to fill. But this also makes the picture lose its original clarity and true colors.
6, point defect
CRT displays basically do not have screen "point defects", while the "point defects (including dead or dark dots, bright spots)" of liquid crystal displays have existed since the birth of liquid crystals. The so-called point defect of LCD is that a certain pixel in the liquid crystal display is damaged, and there is a dead pixel that is continuously bright, not bright or single-color bright, and does not accept the extinguishing signal.
In order to avoid the increase of point defects in use, three main aspects should be paid attention to:
①Avoid touching or hitting the LCD screen with hard objects.
②Avoid vibration during use or transportation.
③ If you are not using the LCD, you should develop a good habit of turning it off.
