Color-changing control method for liquid crystal sunglasses and control device thereof

Abstract

The invention relates to a colour-changing control method for liquid crystal sunglasses and a control device thereof. A control module which can output the control voltage according to the change of a light intensity sensing signal is provided, the output control voltage thereof is applied to liquid crystal lens to control the light transmission rate of the liquid crystal lens; a photoelectric change battery which can receive visible light is used to provide power for the control module, the photoelectric battery is used to input the light intensity sensing signal to an input control module; a lower limit threshold value and an upper limit threshold value of the working voltage of the control module are set, when the light intensity sensing signal applied by the photoelectric battery on the control module is lower than the lower limit threshold value of the working voltage, the control module does not work; when the light intensity sensing signal applied by the photoelectric battery on the control module is higher than the lower limit threshold value of the working voltage and lower than the upper limit threshold value, the control module works to output the control voltage varying with the light intensity sensing signal. The device has the advantages of simple structure, small volume and less energy consumption so that colour of the sunglasses containing the device can vary with the external light intensity.

Description

technical field [0001] The invention relates to a pair of sunglasses, in particular to a method and device for controlling automatic discoloration of liquid crystal sunglasses Background technique [0002] Color-changing sunglasses can protect the eyes from external strong light stimulation. Traditional color-changing mirrors use photosensitive materials as lenses, and use the light-to-color characteristics to adjust the lens transmittance. Photosensitive color-changing glasses usually work in the ultraviolet band. Under the sunlight, a photochemical reaction occurs in the lens, which reduces the transmittance of the lens and darkens the lens. When this kind of photochromic mirror encounters a sudden change in the surrounding environment, such as entering a room or tunnel, it cannot automatically adjust the lens's transmittance quickly. Excessive rate, causing the wearer's vision to weaken, unable to see the surrounding environment clearly. This is because the discoloration...

AI Technical Summary

Problems solved by technology

[0003] Another type of solar photochromic mirror in the prior art uses liquid crystal as the lens, and changes the light transmittance of the lens by changing the voltage applied to the liquid crystal lens. Solar photochromic mirrors usually need to be equipped with batteries, light intensity sensors, A / D conversion circuits or operational amplifiers, square wave generators, etc., or set switches to manually change the control voltage applied to the liquid crystal lens. The circuit system is too large, The problem of high power consumption, and the battery must be replaced regularly, which not only increases the cost of the glasses, but also is very inconvenient to use because of the large size, so it restricts the feasibility of using this type of electronic glasses as a civilian product, and it is also a product of this type One of the important reasons why no product has been listed so far

[0004] In addition, in the prior art, the liquid crystal lens is driven by providing a DC signal, which can reduce electronic components, but this electronic circuit is not suitable for the liquid crystal lens, because when the DC signal is applied, the liquid crystal will move ions, resulting in Discoloration point, shortening its service life

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