The relationship between the hard screen and the soft screen of the LCD screen:
One: Hard screen and soft screen of LCD screen: refers to the technical difference between the screens
Hard screen mainly refers to IPS technology, which was initially implemented by Japanese manufacturers such as Hitachi. Later, LPL was greatly improved, forming S-IPS hard screen technology, also known as super IPS technology or second-generation IPS technology. Panels such as TN, PVA, and MVA are all soft screens, and the representative manufacturers are Samsung, Sharp and Taiwan Province panel manufacturers. The basic difference between the two lies in the way in which the liquid crystal molecules are placed. A hard screen does add a tough protective coating to the LCD panel, but it's not the fundamental difference. When there is a difference between a soft screen and a hard screen, you can tap or press the screen quietly with your fingers. If there is a shadow, it is a soft screen, otherwise it is a hard screen. Due to the LCD screen, there is a layer of liquid crystal on the back, and a shadow will appear after a slight press.
From a visual point of view, there is no obvious interval between several techniques, and they are all between 170-180 degrees; in terms of service life, the two are similar; in terms of energy consumption, the first thing to look at is the backlight, circuits, etc. , not because the panel is soft and hard; in terms of safety performance, there is no basic difference between a hard screen and a hard film. The difference between the two is mainly in response speed and contrast. The IPS hard screen responds faster, and the dynamic picture performance is relatively outstanding, but the contrast performance is relatively poor. "It should be noted that the difference between the two is theoretically formed by the different placement of liquid crystal molecules. The product will also vary depending on the production capacity.
Two: The principle of LCD screen rubbing orientation
The alignment layer of the liquid crystal display panel can be constituted by rubbing the alignment film with fleece in one direction. The liquid crystal molecules of the alignment layer will be placed in parallel according to the rubbing direction, so that the co-alignment can be accomplished. The liquid crystal molecules of the upper and lower sheets are placed at 90 degrees to each other, which is the central link in the manufacture of twisted nematic liquid crystal cells. There is still debate about the principle of rubbing alignment, but one thing is certain, that is, when the liquid crystal molecules are placed along the rubbing direction, the energy of the system is the lowest, or the liquid crystal molecules of the alignment layer tend to be placed in the direction with the least energy, which is called Anchoring energy. As for the microscopic mechanism of the placement direction given by friction, it can be considered from the following two aspects: First, the grooves with dense depth and width are "planed" by friction. The two ends of the groove are different. If the process of planing is used as an analogy, one end of the groove is wide and deep, and the other end is narrow and shallow. Such grooves, especially those with appropriately sized liquid crystal molecules (nanoscale), must have an effect on the orientation of the liquid crystal molecules. Another consideration is the effect of the orientation direction of organic polymers on the orientation of liquid crystal molecules.
How to rub the hard screen and soft screen of the LCD screen?
2022 07/30