Publish Time: 2024-02-29 Origin: Site
The LCD display is a display using liquid crystal as a material. It turns into a transparent liquid when heated, and turns into a crystalline cloudy solid after cooling. Under the action of the electric field, the liquid crystal molecules will change in arrangement, which will affect the change in the intensity of the incident light beam passing through the liquid crystal. Accordingly, by controlling the electric field of the liquid crystal, the light and dark changes of the light can be realized, achieving the purpose of information display. Because there are control circuits and driving circuits around the liquid crystal material. When the electrodes in the LCD display generate an electric field, the liquid crystal molecules will be twisted, so that the light passing through them will be refracted regularly, and then it will be filtered by the second layer of the polarizer and displayed on the screen. It is worth pointing out that because the liquid crystal material itself does not emit light, LCD usually needs to configure an additional light source for the display panel. The main light source system is called the "backlight module".
l Monochrome display principle
l Color Display Principle
l Dynamic image display principle
The LCD display is to pour liquid crystal between two planes with thin grooves. The grooves in these two planes are perpendicular to each other (intersecting at 90 degrees). That is to say, if the liquid crystal molecules on one plane are aligned in the north-south direction, the molecules on the other plane are aligned in the east-west direction, and the molecules located between the two planes are forced into a state of 90-degree twist. The light generally travels along the direction of the arrangement of the molecules, so the light is also twisted 90 degrees when passing through the liquid crystal. When a voltage is applied to the liquid crystal, the liquid crystal molecules will rotate to change their light transmittance, thereby realizing a multi-grayscale display. LCD display usually consists of two polarizers that are perpendicular to each other. The polarizer acts as a fence, blocking light wave components as required.
For laptop or desktop LCDs, more complex color displays are required. As far as color LCD display is concerned, it is also necessary to have a color filter layer specially designed to deal with color display, that is, the so-called color filter, also known as "color filter". In a color LCD panel, each pixel is usually composed of three liquid crystal cells, each of which is preceded by a red, green, or blue (RGB) three-color filter. In this way, light passing through different cells can display different colors on the screen. Color filters are typically deposited on the front glass substrate of the display, along with the black matrix and common transparent electrode. Color LCD displays can create colorful images in high-resolution environments.
The perception of dynamic images by the human visual organs (eyes) has the phenomenon of so-called "visual persistence", that is, high-speed moving pictures will form a short-term impression in the human brain. The early cartoons, movies, and the latest game shows have applied the principle of "visual persistence", allowing a series of gradual images to be displayed in rapid succession in front of people's eyes to form dynamic images. When multiple images are generated at a speed exceeding 24 frames/s, the human eye will perceive a continuous picture. This is also the origin of the movie playback speed of 24 frames per second. If the display speed is lower than this standard, people will feel the pause and discomfort of the picture. High-definition display of fast-moving pictures, and the general image movement speed exceeds 60 frames/s. That is to say, the interval time of each frame of the active picture is 16.67ms. If the response time of the liquid crystal is greater than the interval time between each frame of the picture, people will feel that the picture is a little blurred when viewing fast-moving images. Response time is a special indicator of LCD display. The smaller the value, the better, and the fast enough response time can ensure the coherence of the picture. If the response time is too long, it is possible to make the LCD a moving image, there is a feeling of trailing shadow dragging. The general response time of the LCD display is 2-5ms.
The above is the relevant content about the working principle of LCD display. If you are interested in an LCD display, you can contact us. Our website is www.smartboardfactory.com.