Analysis of three liquid crystal displays with wide viewing angle

After experiencing rapid development in 2005, LCD technology entered a new field. Response time, contrast, brightness, viewing angle... have all reached a new level, but there is also a very obvious problem in front of us, that is, in the face of many high-parameter LCD products, how can we get from What is the performance of the LCD monitor?

Undoubtedly, "wide viewing angle technology" is the most direct judgment method, because wide viewing angle technology is one of the new generation technologies promoted by major liquid crystal manufacturers, it not only relates to the viewing angle of liquid crystal display, but also directly affects the liquid crystal display. Other performance parameters such as response time, brightness, etc. At present, there are four types of wide viewing angle technologies that are widely used by major LCD brands: TN+Film (TN+ viewing angle extension film) wide viewing angle technology, Fujitsu's MVA technology, Hitachi's IPS technology, and Samsung's PVA technology. Although these techniques are mainly based on improving the viewing angle, the reduction of response time, the expression of color, and the improvement of contrast are also included in these technologies.

Before we get a detailed understanding of these wide viewing angle technologies, we first need to understand the definition of viewing angles for liquid crystal displays. LCD is different from CRT. Because of its natural physical characteristics, when the user looks at different angles, the displayed image will be distorted. We change the picture quality to an unacceptable critical angle called its angle of view. The distortion of the picture mainly includes contrast, chromatic aberration and grayscale inversion (meaning that the low gray level is brighter than the high gray level).

TN+Film (viewing angle expansion film) wide viewing angle technology

TN+Film wide viewing angle technology is currently the most widely used in the low-end LCD market. Because it is based on the traditional TN mode liquid crystal, it only adds a film process to the original LCD panel. Since there are not many technical updates, the original production line is still used, which will not lead to a decline in the yield of liquid crystal products, and the cost is also controlled, so the price is lower, which is also an important reason why it can be sold in the low-end market. .

So why is this technology only applicable to low-end LCDs? The first is that the issue of highlights has not improved in this technology. In addition, the TN mode liquid crystal itself has a long response time, a small number of color elements, and a low aperture ratio, which is not improved in this technique. Therefore, this technology only improves the viewing angle, and it is obviously not used by the high-end LCD market. Its low cost and less than ideal performance determine that it can only be in the low-end market.

Although TN+Film (viewing angle expansion film) wide viewing angle technology has many shortcomings, it is not a very backward technology. Due to its mature technology, it only needs to adopt higher precision driving and optimization technology to overcome its inherent shortcomings. For example, the response time and the maximum number of color reductions can be superior to other new wide viewing angle technologies. Of course, the cost of the optimized TN+Film liquid crystal display is relatively increased, so the price must be slightly higher.

At present, most liquid crystal manufacturers have TN mode liquid crystal products, and only a viewing angle expansion film can be attached to obtain a wider viewing angle. However, it is worth noting that the low-end TN mode liquid crystal products have a wide viewing angle, but are easy to produce bright spots. The method of judging whether it is the TN mode is to observe the color change of the liquid crystal on the side of the display. If the bright place of the screen is darker on the side and the dark place is brighter, it means the TN panel.

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