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Views: 274 Author: Kelai Publish Time: 2024-08-22 Origin: Site
Content Menu
● 1.The basic principle of LCD display screen
● 2.The Development History of LCD Display Screen
● 3.Expansion of Application Fields for LCD Display Screen
● 5. Disadvantages of LCD screens
LCD display screen is a flat display technology widely used in various electronic devices. Its emergence has made previous imaging technologies outdated because it has better image quality, lower power consumption, and thinner screen thickness than traditional technologies. The entire LCD module uses an LED backlight module as the light source input, which controls the rotation direction of liquid molecules through voltage to control the display brightness. The brightness change between the brightest and darkest is divided into thousands of parts, which is commonly known as grayscale. Taking an 8-bit panel as an example, it can represent 2 to the power of 8, which is equal to 256 brightness levels, and we call it 256 grayscale. After having brightness control, the white light emitted by the LED can be smoothed through the red edge blue colored wave light sheet to control the display color. According to the optical color theory mentioned earlier, different combinations of light with different colors and brightness can achieve extremely rich color presentation, which is the colorful display image we see through the screen. The stacked structure of LCD screen from top to bottom is as follows：
Cover Lens:The outermost layer of protective glass
Optical Adhesive (OCA):A high transmittance adhesive used for bonding between screens and covers
Polarizing film:The full name of polarizing film is polarizing film, which is a polymer material composite film composed of polarizing film, inner protective film, pressure-sensitive adhesive layer, and outer protective film. It is a medium with a signal and vibration direction, and only allows light in the same direction as its own polarization direction to pass through the liquid layer (glass substrate+liquid+glass substrate). By controlling the voltage between the two poles, the deflection angle of liquid crystal molecules can be controlled. The light from the LED backlight will pass through along the signal and vibration direction of the liquid layer. Combined with the upper and lower polarizing films, it can achieve brightness control
Color filter:a film layer composed of three types of wave light films, red, green, and blue, for each pixel. The white light emitted by the LED backlight can form the corresponding three primary colors of red edge blue light through the positions of different colored film layers
TFT (Thin Film Transistor):Control the circuit layer, thin film, body tube, polarizing film under the tube, with the same rest function as the upper signal light film. The signal vibration direction of the lower signal light film and the signal vibration angle in front of the upper signal light film should be measured at 00 °. The backup backlight module (LED light+light guide plate+brightness enhancement film+diffusion film) ensures that the backlight emitted by the LED is uniformly projected onto the liquid crystal layer
TP Sensor (Touch Circuit Layer):Currently, mainstream mobile phone products can be divided into several forms based on the position of TP Sonser, such as GF (Glass Filmy OGS (One Glass Solution), In CELL, On Cell)
By utilizing the changes in liquid crystal molecules under the action of an electric field, the orientation of liquid crystal molecules can be controlled by controlling the strength of the electric field, thereby controlling the transmission and blockage of light and achieving image display. Liquid crystal molecules have two orientation states, parallel and perpendicular to the direction of the electric field. By controlling the strength of the electric field, the orientation state of liquid crystal molecules can be controlled, thereby changing the transmission and blocking of light.
1. In 1963, the theoretical basis for LCD liquid crystal displays was proposed by American physicists George Herschel and Larry Ramsey, who discovered the orientation changes of liquid crystal molecules under the action of an electric field.
2. In 1972, Mitsubishi Electric Corporation of Japan developed the first prototype of an LCD display screen and achieved commercial production success.
3. In 1980, Toshiba Corporation of Japan launched its first commercial LCD display screen product, marking the beginning of large-scale commercial production of LCD displays.
4. In the 1990s, with the continuous maturity of display technology, the image quality and color performance of LCD screens were greatly improved, and their application fields began to expand to various electronic devices such as mobile phones, televisions, and computers.
5. In the 2000s, the resolution of LCD screens gradually increased, and screen sizes also grew larger. At the same time, new LCD display technologies such as LCD flat panel TVs and LCD electronic ink emerged.
6. After 2010, with the rise of the new generation OLED display technology, LCD screens began to face competitive pressure, but still dominated the large-size display market.
1. In the automotive field, LCD screens are widely used in devices such as car dashboards, navigation systems, entertainment systems, etc., providing rich information display and operation interfaces.
2. In the field of medical equipment, LCD screens are used to display patient monitoring data, imaging diagnosis, and other information, improving the operational performance and image quality of medical equipment.
3. In the aerospace field, LCD screens are used in the instrument panels and control systems of airplanes and spacecraft to provide accurate flight and navigation information.
4. In the field of smart home, LCD screens are used in smart home devices to display various operating interfaces and achieve intelligent home control and management.
LCD screens use liquid crystal molecules to manipulate images, resulting in stable display effects that are not easily affected by external light interference. This enables LCD screens to provide better visibility and anti reflection capabilities when used outdoors.
Compared to OLED screens, LCD screens consume less energy when displaying static images. This is because LCD screens use backlighting to illuminate the entire screen, and when displaying black pixels, the backlighting can be completely turned off, saving energy.
Due to the mature production process and relatively simple structure adopted by LCD screens, their manufacturing cost is relatively low, which also makes the price of LCD screens relatively affordable in the market.
The display effect of LCD screen may vary at different viewing angles, especially when the viewing angle is large, there may be color shift and brightness decrease. This may cause inconvenience for scenarios that require multiple people to watch or share screen content.
The contrast of LCD screens is relatively low, and the black display effect is not deep enough, which can affect the layering and detail expression of the picture.
LCD screens are widely used in various electronic devices due to their excellent image quality, low power consumption, and thin design characteristics. With the continuous advancement of technology, the image quality and color performance of LCD screens have been greatly improved, and their application fields are becoming increasingly widespread. In the future, with the continuous emergence of new generation display technologies, LCD screens will face more competitive pressure, but as a mature technology, it will still maintain its advantageous position in specific fields.
