9 Main technical indicators of TFT LCD display


1. Resolution of TFT LCD display


LCD is displayed by LCD pixels, but due to the number and location of LCD pixels are fixed, so the LCD only under the standard resolution to achieve the best display effect, and under the resolution of the non-standard is internally by LCD IC by interpolation algorithm calculation, should be this picture will become blurred, but the real resolution of the LCD monitor according to the LCD panel size, 15 inch LCD real resolution of 1024 x 768. 



2. Point distance of TFT LCD display


The pixel spacing of an LCD monitor is similar to the point spacing of a CRT. However, the pixel spacing of LCD displays is not as important to product performance as that of CRTs.The spacing of the CRT varies depending on the design of the mask or grating, the type of video card, and the frequency of the vertical or horizontal scan.LCD monitors have a fixed number of pixels. Therefore, as long as the size and resolution are the same, all products should have the same pixel spacing. For example, a 15-inch LCD display with a resolution of 1024×768 has a pixel spacing of 0.297mm(some products are labeled 0.30mm). 



3. corrugated of TFT LCD display


Corrugated and is invisible and phase, water ripples will show in the picture like waves ripple results of a phase in the general case quite ugly, but you can also use images to detect all white, although is not very easy to detect and display some distance a little, stand closer look a look, can discover, also can adjust the water ripple. 



4. Response time of TFT LCD display


Response time is an important index for LCD, it refers to the speed of each pixel to respond to the input signal, namely the pixel by light or dark change from light to dark, the speed of the unit is milliseconds (ms), response time is as small as possible, if the response time is too long, in the dynamic image display, especially in the watch DVD, play games, can produce serious "tail" phenomenon. At present, the response speed of most LCD displays is around 25ms, such as BenQ, Samsung and other high-end products to respond faster than 16ms or even 12ms liquid crystal. 



5. Visual Angle of TFT LCD display


Visual Angle is also a very important parameter of the LCD display. Because the LCD display must be in a certain viewing Angle range, in order to get the best visual effect, if viewed from other angles, the picture will dim (brightness), color changes, and even some products from positive to a negative image. The resulting up and down (vertical visual Angle) or left and right (horizontal visual Angle) Angle sandwiched, is the LCD "visual Angle."Because the light source that provides LCD display already has certain directionality when output after refraction and reflection, the phenomenon of color distortion will occur when viewing beyond this range. 



6. The refresh rate of of TFT LCD display


Because of the design differences, LCD displays don't actually flicker like CRT displays because of the high or low refresh rate. For CRT display refresh rate is related to screen update speed, the more the faster the picture is not easy to twinkle, the refresh rate is generally above 75 Hz, such use is more won't feel images flashing (if you have seen by the camera photograph of a display screen, will find that there is a shadow flash across, if the refresh rate is high, the less the shadow flicker frequency, to the user's eyes, the better). 



7. Brightness and contrast of TFT LCD display


Brightness is every square meter candlelight (CD /m2) for measuring unit, usually will mark brightness in LCD specification, and the mark of brightness is the maximum brightness that backlight illuminant place can produce.General LCD displays have display 200cd/m2 brightness ability, higher even up to 300cd/m2 above.The higher the brightness, the wider the suitable environment. 

At present, there are two methods to improve the brightness, one is to improve the pass rate of the LCD panel; The other is to increase the brightness of the background light, that is, to increase the number of tubes. The important thing to note here is that a brighter product is not necessarily a better product, and the uniformity of brightness is the key, which is not found in the product specification. The luminance uniformity is closely related to the number of light source and reflector and the way of configuration. 



8. Signal input interface of TFT LCD display


LCD displays generally use two types of signal input: the traditional VGA analog 15-pin d-sub (15-pin d-sub) and the DVI input interface. In order to suit the mainstream of the display card with the analog interface, most LCD displays provide an analog interface and then convert the analog signal from the display card to the digital signal in the display. In the process of digital to analog signal conversion, there will be some information loss, so the display of the picture font may be fuzzy, jitter, color deviation, and other phenomena occur; Now with DVI and VGA interface graphics card everywhere, the price is not high, so it is recommended to use DVI interface. 



9. Bad spot of TFT LCD display


The LCD display is most afraid of bad points, the so-called bad point, why is displayed by the display images, a point on the LCD always shows the same color (in green and blue is the generally bad point), check the bad point method is quite simple, as long as the LCD display brightness and contrast to the maximum (picture) to display the gratification of white, and transferred into the minimum (picture) to display the gratification of black, can easily find out the bad points cannot display colors. 



Second, the choice of LCD display


With the improvement of TFT panel technology for LCD display and the reduction of production cost, many manufacturers have actively turned to the professional LCD display market. In addition to the above mentioned technical indicators, pay attention to the following aspects:


1. If the OSD control interface provides more display Settings, the flexibility of self-adjustment is greater. 

2. When choosing a model equipped with a DVI interface, pay attention to whether it is DVI-i or DVI-d, and whether it provides the adapter of the DVI Analog interface. 

3. in the sound performance, to see if there is equipped with RCA connector, namely white and red left and right channel connector. 

4. It will be better if equipped with an s-video connector and Video RCA connector to facilitate connection with other AV equipment. 

5. for the need to edit digital photos of the user, pay more attention to the LCD display color temperature performance, if you have color temperature adjustment technology is better. 


When choosing an LCD monitor, you can also use software to test the real performance of the monitor. Monitors Matter Check Screen is a professional LCD testing software that can not only detect LCDs but also monitor CRT displays. It includes a number of test items, can detect the LCD color, response time, text display effect, whether there is a "bad point" and other vital indicators.