LCD Knowledge

1、What is LCD?

LCD is the full name of liquid Crystal Display. There are several types of LCD, such as TFT, TFD, STN and so on, which can not locate program input points on the DLL.

So，Notebook LCD screen is commonly used in TFT. TFT (Thin Film Transistor) refers to thin film transistors. Each LCD pixel point is driven by a thin film transistor integrated behind the pixel point, so that it can display screen information with high speed, high brightness and high contrast. It is one of the best LCD color display devices at present, and it is now on notebook computers and desktop computers. The mainstream display device. Compared with STN, TFT has excellent color saturation, restoring power and higher contrast. It can still see very clearly in the sun, but its disadvantage is that it consumes more power and costs more.

2、 What is LED?

LED is the abbreviation of light emitting diode Light EmittingDiode. LED applications can be divided into two categories: one is LED display screen; the other is LED single tube applications, including backlight LED, infrared LED and so on. Now, for the LED display, China's design and production technology level is basically in keeping with international synchronization. The LED display screen is a display device consisting of 5000 light-emitting diodes arranged in a computer configuration sheet. It is driven by low voltage scanning. It has the characteristics of low power consumption, long service life, low cost, high brightness, few faults, large viewing angle and long visual distance.

3、The difference between LCD display screen and LED display screen.

Compared with LCD display, LED display has more advantages in brightness, power consumption, visual angle and refresh rate, and has been cancelled to the navigation of the web page. Using LED technology, we can produce a thinner, brighter and clearer display than LCD.

1, the power consumption ratio between LED and LCD is about 1:10, and LED is more energy efficient.

2, LED has higher refresh rate and better performance in video.

3. LED provides a 160 degree wide angle of view. It can display various text, digital, color image and animation information. It can play TV, video, VCD, DVD and other color video signals.

4. The reaction speed of single element of LED display screen is 1000 times that of LCD screen. It can also be taken good care of under strong light and adapt to the low temperature of minus 40 degrees.

Simply put, LCD and LED are two different display technologies. LCD is a display screen composed of liquid crystals, while LED is a display screen composed of light emitting diodes.

Dear friends, we should understand the difference between LCD and led now. Then everyone will say LED is so good, then I must buy LED display. However, the focus of this article has come: the current market said that the LED display screen is not the real sense of the LED display screen, precisely speaking, the LED backlight LCD display, LCD panel is still the traditional LCD display screen, in a sense, this more or less contains the nature of fraud! uuuuuuuu Samsung has been convicted by the British Advertising Association of violating the country's advertising law because its "LED TV" LCD TV has misled consumers. For liquid crystal display, is the most important key to the LCD panel and the backlight type liquid crystal panel display on the market generally use the TFT panel, is the same, the difference between LED and LCD is just the type they are not the same: backlight LED backlight and backlight CCFL (that is, respectively, LED fluorescent lamp) cold and cloudy Very light tube.

The difference between LED display and LCD display, which is better for LCD display and LED display?

LED backlight: power saving (relative to CCFL power saving 30%~50%), high price, bright degree and high saturation.

CCFL backlight: relative to LED backlight power consumption (still more power than CRT), cheap.

Picture difference: LED backlight is brighter and has higher saturation (CCFL and LED are different from natural light sources).

How to distinguish: LED backlight will emphasize LED TV, and CCFL LCD TV is not emphasized.

Have a real LED TV on the market (not by the backlight, will take the initiative to light), SONY and Samgsung have, but the panel present in 11 inches, and the price is very expensive, like the SONY 11 inch AMOLED TV price of about rmB18000, belongs to the high-end market, so the market rarely. Let us look at the actual picture comparison chart between LCD and led, 2 laptop display below: on the left side of the CCFL type LCD backlight, LED backlight is on the right side of the LCD, respectively, compared to red, green and blue three colors under the following figure:

As you can see from the graph, the color difference between the LCD screen and the LED screen is not very large under the general naked eye observation. If you just want to LED the name pay not commensurate with its cost of money, it is not necessary.

4、The difference between LED display and LCD screen.

In fact, the LED display and LCD display are the same, they are all liquid crystal. The main difference is that the backlight source that makes the screen bright is different.

1, ordinary liquid crystal display using CCFL light source, is a cold cathode fluorescent lamp (scanning lamp appearance similar to a copy of the screen), on each side of a root, the back of the display has a backlight board, fluorescent material composition, can make both sides of the light source evenly distributed on the back surface of the screen, thus the entire screen The curtain shines evenly. But because of technical limitations, so the display brightness is not completely uniform, but it is difficult to find it, at the same time the lamp also has a certain life, a long time will be yellow.

2, LED liquid crystal display using LED light source, light emitting diode is (like with household appliances on the red blue lights.). This is the two luminescence tube power, and because not so can a tube array is uniformly distributed on the LCD screen.