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How to buy LCD monitors
2011-11-15 by seoer1

Display many types of points according to their works, the more common is the cathode ray tube display (CRT), liquid crystal display (LCD), plasma display panel (PDP) and vacuum fluorescent display (VFD), etc., here is to introduce the liquid crystal display. As China LCD module technology works very different from traditional CRT monitors, and the nominal value of its nominal method also familiar CRT monitors.
So how to identify the liquid crystal display technology parameters?

Ready knowledge of LCD (LiquidCrystalDisplay) LCD display works completely different from the traditional CRT monitors. It shows the basic components of a liquid crystal material. In layman's terms is the two liquid crystal display glass sandwiching a layer (or layers) liquid crystal material, there are a few behind the glass lamp continue to light, the signal under the control of liquid crystal material change their light transmission state, so you will be able to see the image of the front glass panel.

Pitch and pitch LCD viewing area is composed of liquid crystal display interval between each pixel size, the current mainstream 15-inch LCD display products, the standard is generally 0.297 mm dot pitch, the corresponding resolution of 1024 × 768.

LCD viewing area is the "real", and in general there is a reference: 15-inch LCD viewing area close to 17-inch CRT monitor.

Screen dead pixel dead pixel screen is the most common white point or black point. Identification of black spots is to transfer the entire screen into black and white, then no place to hide a black point; white spots, by contrast, adjust the screen to black, white spots also will show his true colors. Usually not more than three dead pixels generally display can also be considered qualified factory, but prices vary greatly and no dead pixels. Therefore, users in the purchase of liquid crystal display when no dead pixels must pay attention to the selection of products. If you do not see any white spots black spots dead pixels, it can only choose quality assurance compared to big brands.

Brightness of the display brightness generally cd/m2 (lumens per square meter) as a unit, the higher the brightness, the display on the surrounding environment, the stronger anti-interference ability, the display becomes brighter. This parameter is to reach at least 200cd/m2, preferably more than 250cd/m2.

The higher the brightness of the CRT display, the greater its radiation, and the brightness of the LCD display is backlit by fluorescent tubes to get, so there is no negative impact on the human body.

Contrast Contrast is the provision of lighting conditions and viewing conditions, the display bright areas and dark areas of the brightness ratio. Contrast is a direct reflection of the LCD can reflect the rich color gradation parameters, the higher the contrast, reduction of screen layering, the better. Nominal current LCD 250:1 or 300:1, 400:1 or 500:1 in high-end products.

To note here is that the contrast and brightness must be produced with the best display.

Viewing angle LCD display is backlit display, the light emitted by a backlight behind the graphic LCD display module is provided which will inevitably lead to only one of the best LCD monitor to enjoy the angle --- face. When you watch from the other point of view, because light can penetrate into the next pixel and the human eye, it will cause color distortion, undistorted range of LCD monitors is the viewing angle. LCD viewing angle is also divided into horizontal angle and vertical angle, horizontal viewing angle is generally greater than the vertical viewing angle. Now, as long as the horizontal viewing angle of 120 degrees to achieve the application to meet the needs of most users.

Response time refers to the input signal for LCD displays the speed of response, that is, liquid crystal from dark to light or dark by the light switch response time. Generally divided into two parts: Tr (rise time), Tf (fall time), and we call response time refers to the sum of the two, the smaller the better response time, if more than 40 ms, the there will be motion picture hysteresis. Currently the standard response time LCD monitor most of the 25 milliseconds, but there are a few models up to 16 ms.

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