Weak current College】 【LCD technology parameters】.

<br> 1. Visual area <br> <br> LCD display size of the label is actually you can use the range of the screen. For example, a 15.1 inches LCD monitor approximately 17 inch CRT screen visual range. <br> < .br> 2. the Visual angle <br> <br> LCD monitor Visual angle symmetrical, but you do not have symmetrical up and down. For example, when the backlight of the incident light by polarizer, LCD and orientation film, will have the .output light of directional characteristics of specific, that is, the majority from the screen shot of light have a vertical orientation. If from a very steep angle to see a full white screen, we may see a black or color distortion. Generally speaking, the .arrow point to less than or equal to left and right angles. If the Visual angle is around 80 degrees, said at the beginning to the screen location of the normal 80 degrees can be clearly seen when the screen image. However, because the range of .vision, without standing in the best Visual angle, see color and brightness there will be errors. Now some manufacturers to develop a variety of wide angle technology in an attempt to improve LCD viewing angle characteristics, such as: IPS (InPlaneSwitching), MVA ( .MultidomainVerticalAlignment), TN + FILM. These technologies are able to put the Visual angle of liquid crystal display increased to 160 degrees, or even more. <br> <br> 3. dot pitch <br> <br> We are often asked to .LCD dot pitch is great, but most people don't know is how to get this number, now let's take a look at how it is. For example the General 14 inches LCD viewable area 285.7mm × 214.3mm, its maximum resolution of 1024 .× 768, so dot pitch equals: Visual width / horizontal pixels (or Visual height / vertical pixels), ie 285.7mm/1024 = 0.279mm (or 214.3mm/768 = 0.279mm). <br> <br> 4. color .degree <br> <br> Important is, of course, the LCD color performance. We know the nature of any one color is red, green, blue three basic colors. LCD Panel is made up of 1024 × 768 pixel dots imaging, each .independent of the pixel color is red, green and blue (R, G, B) of the three basic colors to control. Most manufacturers produced liquid crystal display, each basic colour (R, G, B) reached 6-bit, or 64 .manifestation of degrees, so each individual pixel is 64 × 64 × 64 = 262144 color. Many manufacturers use the so-called FRC (FrameRateControl) technology to simulation approach to demonstrate the full-color images, each basic colour (R, G, B .) can reach 8 bit, 256 performance degrees, so each separate pixels will have up to 256 × 256 × 256 = 16777216 color. <br> <br> 5. contrast values <br> <br> Contrast value is to define the maximum .brightness value (all white) divided by the minimum brightness value (all black) ratio. CRT monitor contrast values are generally up to 500: 1, resulting in a CRT display rendering truly all-black screen is very easy. But the LCD is not .very easy, by the cold cathode ray tube of the backlight is very difficult to do quickly switching action, backlight remains lit. In order to get the black screen, LCD modules must be completely to the back light of light completely blocked, but in the .physical characteristics of the components and does not fully meet these requirements, will always be some leaked. In General, the human eye can accept the comparison value of about $ 250: 1. <br> <br> 6. brightness value <br> .<br> The LCD monitor's maximum brightness, usually made of cold cathode ray tube (backlight), brightness values generally 200 ~ 250cd/m2. LCD Brightness slightly lower, will find screen dark. Although technology can achieve higher brightness, but this does not .mean brightness value the higher the better, because they are too high brightness of the monitor may make the viewers eye injuries. <br> <br> 7. response time <br> <br> Response time is the LCD monitor's pixels on the input .signal reaction speed, this value is, of course, the smaller the better. If the response time is too long, it is possible to make the LCD monitor in the display dynamic image, drag a tail shadow. General LCD response times between the 20 .~ 30ms. <br> <br> <br> <br> <br>.