Anti-candid method and system suitable for display device

Abstract

The invention discloses an anti-candid method suitable for a display device. The method comprises: arranging a liquid crystal light valve in front of the display device in parallel; if the exposure mode of the camera is a global exposure mode, setting a switching period T according to the exposure time t1 to enable the exposure mode to meet the following conditions: mT is not equal to t1, 1 / T is greater than or equal to f0, and m is a positive even number greater than or equal to 2; and if the camera is in the roller shutter type exposure mode, setting a switching period T according to the single-row scanning time t2 and the total scanning time t3 of the camera, so that the following conditions are met: t1 is less than T, 2T is less than t3, and 1 / T is greater than or equal to f0. The liquid crystal light valve can be arranged before display setting; the switching period is reasonably set; on one hand, due to the visual residual characteristic of human eyes, it is ensured that a user cannot perceive the switching action of the liquid crystal light valve and can still normally watch a display picture, and the watching experience of the user is good, and on the other hand, the exposure characteristic of the digital camera equipment is utilized, so that stripes exist in a shot picture, the shot picture cannot be normally used, and the anti-candid purpose is indirectly achieved.

Description

technical field [0001] The invention relates to the technical field of liquid crystal light valves, in particular to a method and system for preventing sneak shots suitable for display devices. Background technique [0002] Traditional display screens (including projections) face users directly, and usually cannot prevent sneak shots, which may easily cause problems such as information leakage. Staff usually use the method of manual inspection of users in the field of view to prevent sneak shooting. On the one hand, the workload is heavy, and on the other hand, it is difficult to prevent pinhole cameras, miniature mobile phones and other sneak shooting tools. [0003] In order to solve this problem, the following two methods are currently adopted: [0004] The first method is to install a spy-proof film in front of the screen, so that the viewing angle of the screen is reduced, and people outside the viewing angle can only see the dark picture. However, in this way, people...

AI Technical Summary

Problems solved by technology

However, in this way, people on the front of the screen (within the viewing angle) can still see all the content, and it can only narrow the jurisdiction of the staff, and the viewing angle is limited, so it can only be used in some special occasions

[0005] The second method is screen encryption. By adding a screen saver on the screen, such as adding an external module, users can wear special glasses to see the real picture. Can’t see the displayed content, but in this way, users need to wear special glasses, the experience is not good, and the cost is high

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