Liquid crystal display device capable of switching viewing angles

Abstract

An LCD with switchable viewing angle includes a first substrate, second substrate, and a liquid crystal layer. The first substrate is provided with a first electrode and a second electrode. In an embodiment, the first electrode is a pixel electrode, and the second electrode is a common electrode. The second substrate is provided with a third electrode. Liquid crystal molecules in the liquid crystal layer are positive liquid crystal molecules. When a first bias voltage is applied to the third electrode, the LCD is displayed with a wide viewing angle; and when a second bias voltage greater than the first bias voltage is applied to the third electrode, the LCD is displayed with a narrow viewing angle.

Description

technical field [0001] The invention relates to a liquid crystal display device, in particular to a liquid crystal display device capable of switching viewing angles. Background technique [0002] Due to the advantages of thinness, lightness, energy saving, and no radiation, liquid crystal display devices are widely used in electronic equipment such as televisions, personal computers, tablet computers, and mobile phones. At present, the wide viewing angle is the mainstream development direction of the liquid crystal display device, and people can see a complete and undistorted picture when watching the screen of the wide viewing angle liquid crystal display device from different directions. However, when personal privacy and important information are involved, the use of a display device with a wide viewing angle may cause inconvenience to people in some occasions. Therefore, in addition to the demand for a wide viewing angle, displays that can switch or adjust the display ...

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Problems solved by technology

[0003] At present, there are mainly four ways to switch the wide viewing angle and narrow viewing angle of the display: the first is to realize it through the louver shielding film. The first method requires additional preparation of louver shielding film, and requires the user to carry it with him, which causes great inconvenience to the user; the second method is to set a dual-light source backlight system in the LCD to adjust the viewing angle of the LCD. Combined with the anti-prism sheet to change the direction of light so that the light is limited to a relatively narrow range of angles to achieve a narrow viewing angle of the LCD, while the bottom light guide plate combined with the anti-prism sheet can achieve a wide viewing angle of the LCD, but this dual-light source backlight system will This leads to an increase in the thickness and cost of the liquid crystal display, which is not in line with the development trend of thinner and lighter liquid crystal displays; the third is to divide the driving electrode into a wide viewing angle driving electrode and a viewing angle control electrode. When an appropriate driving voltage is applied, appropriate light leakage can be generated to achieve a wide viewing angle. The effect of switching with a narrow viewing angle, but this electrode setting method will reduce the overall aperture ratio and brightness; the fourth method is to add a viewing angle control unit, that is, the normal display panel is superimposed on the viewing angle control module, but this structure is also the same Will increase the overall thickness and weight of the LCD display

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