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Technical Parameters of LCD Display Monitors

2020-11-16 00:00:00  Original:amongo  Click:10

1. Viewable area


The size indicated on the LCD is the same as the actual screen range that can be used. For example, a 15.1-inch LCD monitor is approximately equal to the visual range of a 17-inch CRT screen.


2. Viewing angle


The viewing angle of the liquid crystal display is symmetrical, but not necessarily symmetrical up and down. Generally speaking, the up and down angle should be less than or equal to the left and right angle. If the viewing angle is 80 degrees to the left and right, it means that the screen image can be clearly seen at the position of 80 degrees from the screen normal. However, because people have different vision ranges, if you don't stand within the best viewing angle, you will see errors in color and brightness.


3. Dot pitch


We often ask about the dot pitch of LCD monitors, but most people don't know how this value is obtained. Now let us understand how it is obtained. For example, the viewing area of a general 14-inch LCD is 285.7mm×214.3mm, and its maximum resolution is 1024*768, then the dot pitch is equal to viewing width/horizontal pixels (or viewing height/vertical pixels), That is, 285.7mm/1024=0.279mm (or 214.3mm/768=0.279mm).


4. Color


Of course, the important thing about LCD is color expression. The LCD panel is displayed by 1024*768 pixels, and the color of each independent pixel is controlled by three basic colors of red, green, and blue (R, G, B). The LCD monitors produced by most manufacturers have 6-bits for each basic color, that is, 64 expressions, so each independent pixel has 64*64*64=262144 colors.


5. Comparison value


The contrast value is defined as the ratio of the maximum brightness value (full white) divided by the minimum brightness value (full black). In order to obtain a completely black screen, the liquid crystal module must completely block the light from the backlight. However, in terms of physical characteristics, these components cannot fully meet this requirement, and there will always be some light leakage. Generally speaking, the acceptable contrast value for the human eye is about 250:1.


6. Brightness value


The maximum brightness of an LCD display is usually determined by a cold cathode ray tube (backlight), and the brightness value is generally between 200 and 250 cd/m2. Although it is technically possible to achieve higher brightness, this does not mean that the higher the brightness value, the better, because a display with too high brightness may hurt the viewer's eyes.


7. Response time


Response time refers to the speed at which each pixel of the LCD display reacts to the input signal. Of course, the smaller the value, the better. If the response time is too long, it is possible that the LCD display will have a dragging feeling when displaying dynamic images. The response time of a general liquid crystal display is between 20 and 30 ms.