Basics of LCD Knowledge

1、What is LCD?

LCD is the full name for liquid crystal display. There are several types of LCDs, such as TFT , TFD, STN, etc., which cannot locate program entry points in the DLL.

So, the laptop LCD screen is commonly used in TFT. TFT (Thin Film Transistor) refers to thin film transistors. Each pixel dot of the LCD is controlled by an integrated thin film transistor behind the dot. of pixels, so it can display screen information at high speed, high brightness and high contrast. It is one of the best color LCD display devices today, and is now found in laptops and desktop computers. conventional display device. Compared with STN, TFT has excellent color saturation, restoration power and higher contrast. You can still see the sun very clearly, but its disadvantage is that it consumes more power and costs more.

2, What is LED?

LED is short for Light Emitting Diode. LED applications can be divided into two categories: one is LED display; the other is LED single tube applications, including LED backlight, infrared LED, etc. Now for LED display, China’s design and production technology level is basically in line with international synchronization. LED display 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 failures, wide viewing angle and long viewing distance.

3、The difference between LCD screen and LED screen.

Compared with LCD screen , LED screen has more advantages in brightness, power consumption, visual angle and refresh rate, and web page browsing has been canceled. With LED technology, we can produce a screen that is thinner, brighter and more clearer than LCD.

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

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

3. The LED provides a wide viewing angle of 160 degrees. It can display various texts, digital images, color images and animation information. It can play TV, video, VCD, DVD and other color video signals.

4. The reaction speed of a single element of LED Screen The screen is 1000 times that of LCD screen. It can also take good care 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 made up of liquid crystals while LED is a display screen made up of light emitting diodes.

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

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

LED backlight: energy saving (relative to CCFL energy saving of 30% to 50%), high price, degree of brightness, and high saturation.

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

Image 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 will not emphasize.

It has a real LED TV on the market (not because of the backlight, it will take the initiative to turn it on), SONY and Samsung have it, but the panel is present in 11 inches, and the price is very expensive, like SONY TV price 11 inch AMOLED about rmB18000, it belongs to the high-end market, so the market rarely. Let’s see the actual image comparison chart between LCD and LED, 2 laptop screens below: on the left side of the CCFL type LCD backlight, LED backlight is on the right side of the LCD, respectively, compared with red, green and blue three colors under the following figure:

As you can see from the graph, the color difference between LCD screen and LED screen is not very large with the naked eye. If you only want LED, the name payment is not proportional to your money cost, it is not necessary.

  • The difference between LED screen and LCD screen.

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

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

2, LED liquid crystal display with LED light source, light-emitting diode (such as with household appliances in the red and blue lights). This is the power of two luminescence tubes, and because it is not, an array of tubes is evenly distributed on the LCD screen.