As the mainstream display mode of LCD, IPS is overwhelmingly used in many fields of flat displays. However, due to the stress sensitivity of glass, the stressed light leakage is a bottleneck for achieving perfect dark state performance. The conventional scheme of using a compensation polarizer outside the cell has no effect on this light leakage. Although many studies have been conducted to overcome this limitation, the proposed methods have limited effects. Our research team has proposed a novel light leakage compensation mechanism by introducing a positive A plate that is sandwiched between the glass and the LC layer, therefore the light leakage which is caused by the combined effect of the phase retardations from the stressed glasses and the LC layer can be eliminated. In addition to theoretically analyzing the compensation principles of the novel light leakage compensation mechanism, we also use the developed positive A material to prepare light leakage compensation demos. And then the electric-optical characteristics and light leakage compensation effects of the demos are evaluated. While maintaining excellent optical and electrical characteristics, this technology effectively solves the problem of stressed light leakage of glass-based IPS, improves the dark-state image quality, and breaks the application of IPS in products such as curve products.

Liquid Crystal Display (LCD) has witnessed tremendous development in the past decades. However, there are still some small flaws like L0 light leakage and color shift which are related to material dispersion. Herein, we illustrated two methods to modify the color shift of LCD based on material dispersion. The dispersion characteristic of LC, wave plate and retardation film could markedly impact the dark state light leakage and color shift. We believe that the reverse dispersion material holds a bright future.

With the advent of big data information age and the multi‐field application of display screens, personal private information and commercial secrets are easily leaked through the display device. A privacy display with narrow viewing angle can effectively solve this problem. In this paper, we are going to introduce some advanced privacy technologies existing on the market, including technical principles, application scenarios, advantages and disadvantages. Prospects are made for the development direction of privacy products according to customer demands at the end of the article.

In the field of LCD, Advanced Super Dimension Switch (ADS) technology is widely used due to its outstanding features, such as high transmittance, wide view, and weak color shift. However, the ADS technology still has intractable problems. One of the most difficult problems is the dark state light leakage under mechanical deformation which is inherent in ADS. In this paper, a novel model called Zero Light Leakage ADS (ZLL-ADS) is proposed, which can completely eliminate the dark state light leakage even under deformation. The key point of ZLL-ADS is the introduction of +A plate in ADS panel. The important role of +A is to compensate the phase retardation of liquid crystals to avoid dark state light leakage caused by external stress on ADS panel. By applying ZLL-ADS technology, the product properties of BOE's ADS Pro, especially the quality of the dark picture has been greatly improved, and the advantages of ADS in high transmittance and wide view are still maintained. The compensation principle is explained theoretically and verified by 18.5 inch FHD flat and curved demoes.

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