LCD Display For The Thin

- Feb 11, 2018 -

LCD display for the thin, a certain number of color or black and white pixels, placed in front of the light source or reflector. LCD low power consumption, so much the favor of engineers, suitable for battery-powered electronic devices.

Each pixel of the LCD consists of the following parts: a column of liquid crystal molecules suspended between two transparent electrodes (indium tin oxide), and two polarizers whose polarizations are perpendicular to each other on the two sides. Without the liquid crystal between the electrodes, the light passes through one of the polarizing filters with its direction of polarization completely perpendicular to the second one and is therefore completely blocked. However, if the direction of polarization of light passing through a polarizing filter is rotated by the liquid crystal, it can pass through another polarizing filter. The rotation of the LCD display in the polarization direction of the light can be controlled by the electrostatic field to control the light.

LCD display are highly susceptible to the influence of applied electric fields and generate induced charges. A small amount of charge is applied to the transparent electrode of each pixel or sub-pixel to generate an electrostatic field. Then molecules of the liquid crystal will be induced by the electrostatic field and generate electrostatic torsion force, so that the original rotational arrangement of the liquid crystal molecules changes and thus changes Through the light of the rotation rate. Change the angle so that you can pass the polarizing filter.

Before the charge is applied to the transparent electrode, the alignment of the liquid crystal molecules is determined by the arrangement of the electrode surfaces, and the surface of the chemical substance of the electrodes serves as seed crystals. In the most common TN liquid crystal, the liquid crystal up and down the two electrodes arranged vertically. The liquid crystal molecules are helically aligned and the light passing through a polarizing filter rotates in the polarization direction after passing through the LCD display chip so as to pass through the other polarizing film. A small portion of the light is blocked by the polarizer in the process, looking gray from the outside. After the charge is applied to the transparent electrode, the liquid crystal molecules will be aligned almost parallel to the direction of the electric field so that the polarization of light passing through one polarization filter does not rotate and the light is completely blocked. At this point the pixel looks black. By controlling the voltage, you can control the liquid crystal molecules arranged in the degree of distortion, so as to achieve different grayscale.

Some liquid crystal displays turn black under the action of alternating current, the alternating current destroys the spiral effect of the liquid crystal, and when the current is turned off, the liquid crystal display will become bright or transparent. Such liquid crystal displays are commonly found in notebooks and inexpensive liquid crystal displays. The other is often used in high-definition LCD display or large LCD TVs on the LCD monitor is closed when the power supply, the liquid crystal display is opaque state.

In order to save power, the liquid crystal display uses a multiplexing method. In the multiplexing mode, electrodes at one end are connected together, each electrode is connected to a power source, and electrodes at the other end are also connected in groups. Each group is connected to a power source At one end, the packet design ensures that each pixel is controlled by a separate power supply, and the electronic device or software driving the electronics controls the display of the pixel by controlling the on / off sequence of the power supply.

There are several important aspects to test LCD indicators: display size, reaction time (sync rate), array type (active and passive), viewing angle, supported colors, brightness and contrast, resolution and aspect ratio, and Input interfaces (such as visual interfaces and video display arrays).

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