Exclusive revealed: LED can really improve the display effect?

Led must be better than CCFL?

With almost all manufacturers began to vigorously promote and support LED backlight, LED to replace the traditional lamp backlight (CCFL) has become an irreversible trend. But since LED began officially entered the mass production stage from the beginning of this year, so the market using LED backlight display products relative proportion is still not very large, the traditional CCFL backlight display products still occupy the mainstream position in the market, taking into account the backlight factory upstream is still a certain size CCFL backlight therefore, capacity, CCFL backlight will not be eliminated immediately.

LED backlit display is also a kind of LCD

When the major manufacturers introduced the concept of LED, we see a lot of users and consumers still have some misunderstanding on the concept of LED and LCD, will be completely confused, that "I should buy LED or LCD display now in the forum". In fact, we usually say LED refers to the backlight of liquid crystal display, which is composed of a plurality of light emitting diode particles composed of LED, a component of LCD, CCFl backlight used to replace the traditional (similar to our common fluorescent lamp), so LED and LCD belong to the subordinate relationship instead, a parallel relationship.

CCFL backlight LCD market still occupy a larger market share

LED backlight is definitely better than CCFL?

It is because of the LED backlight menacing, publicity and manufacturers, so a lot of LED back light do not quite understand the consumers feel very confused, do not know whether it is necessary to spend 200 to 300 yuan to buy a LED backlight products, or have been questioned: LED backlight will really like propaganda as the major display manufacturers so well, the color effect and the performance of all aspects of the display will be promoted? If there is any improvement, where is the best place to do?

LED will improve the performance of liquid crystal benchmarks? (1)

LED backlight will enhance the LCD benchmark performance?

Below we will use professional instruments to the use of CCFL backlight, as well as a variety of LED backlight LCD display for detailed testing. In order to make the test results more comparable value, we select the low-end and high-end LED backlight products from the market, and a CCFL backlight using a high-end LCD display products for comparison. Down to the part of the performance test, the instrument used is the Topcon BM-7A luminance colorimeter.

Benchmark test items and methods

Topcon BM-7A luminance colorimeter is a benchmark for liquid crystal displays. Before the test, we will each test to participate in the LCD monitor to the factory mode, and close the dynamic contrast function and all color enhancement technology. At the same time, in the test before we let the FX2431 LCD LCD normal continuous work for an hour. In order to ensure the accuracy of the data, we tested the environment for the opaque darkroom, and manually shut down the power indicator for each display. In addition, taking into account the different graphics cards may have an impact on the final results of each display products, so we all use the same mainframe as a test platform. And the color is different, the benchmark is a reflection of the liquid crystal display the basic performance and quality, similar to when we learn Chinese "basic knowledge", then we used to introduce four test items:

1, brightness uniformity

Because of the brightness of the display screen of each point is not the same, according to the display of different products, the brightness difference between each of the models various screen regions will be different, we often use the numerical difference of luminance uniformity "to quantify the calculation method of average display brightness value divided by the brightness of the center around." center / corner ", this ratio is close to 1, indicating the difference of each part of the screen brightness is smaller, better display effect. Test the brightness uniformity of the LCD display is still the same as the average brightness, take 17 points on the screen, respectively, to test the brightness of the white screen, and finally calculate the center / corner values.

2, black screen nonuniformity

With uneven brightness is similar, black screen nonuniformity represents display brightness difference of each region in the black screen, and it can also be very accurate performance of liquid crystal display control light, the greater the ratio shows more uneven light leakage control. The method of testing the non-uniformity of the black screen is exactly the same as the previous one, but the whole white screen is replaced by the black screen, and the same value is closer to 1.

3, color inhomogeneity

In addition to the difference in brightness, the color of each region of the screen will be different. With the above uneven brightness test is the same as in the test color inhomogeneity when the screen will still take 17 points, respectively, using BM-7A test of chromaticity coordinates of each point (x and y), and finally calculate the center color values / corner chroma value results, the ratio of the smaller data the better.

4, NTSC color gamut value

I believe we have a very understanding of this value, and here we do not introduce too much. The testing method is the use of BM-7A chromaticity coordinates and brightness of red, green and blue respectively to test the value, and according to the calculation of chromaticity coordinates three colors point determined by the area of a triangle, the triangle area ratio is NTSC 100% NTSC color value. The higher the value of the color gamut shows that this monitor can show more