Gradient divisional colour change control method for liquid crystal sunglasses and control device thereof

Abstract

The invention relates to a gradient divisional colour change control method for liquid crystal sunglasses and a control device thereof. Liquid crystal lens are divided into a plurality of parallel liquid crystal bars, the transmittance of every liquid crystal bar is controlled; an average control voltage is output by controllers according to the external average illuminance to control the average light transmission rate of the liquid crystal lens; the incident angle of an intense light source to the liquid crystal lens is measured by an angular transducer, a centre glare-shielding bar is selected according to the incident angle; the control voltage of the centre glare-shielding bar is increased to make the bar a black area, the bars next to the centre glare-shielding bar are used as transition glare-shielding bars, and the control voltage is applied to the transition glare-shielding bars in gradually decreasing current so that the light transmission rate of the transition glare-shielding bars is gradually increased from the black area to a light area to form a gradient light-to-dark transition region between the black area and the light area. The total light transmission rate and the distribution of the light and dark colour change areas of the liquid crystal lens can automatically vary with the environmental illuminance and the angle of the strong incident light, the light-to-dark transition region is arranged on the liquid crystal lens and the lens has the advantages of simple structure, small volume and low cost.

Description

technical field [0001] The invention relates to a pair of sunglasses, in particular to a control method and a control device for automatic discoloration of liquid crystal sunglasses. Background technique [0002] Liquid crystal sunglasses can change the light transmittance of the lens by changing the voltage applied to the liquid crystal lens. In the prior art, some liquid crystal glasses divide the liquid crystal lens into a plurality of adjacent liquid crystal strips and arrange them in one direction , apply different voltages to each liquid crystal bar, and the shadow effects of different light and dark areas can appear on the lens. The disadvantage of this type of lens is that the difference in light transmittance between adjacent bars is fixed, and there is no automatic adjustment function, so it cannot adapt to changes in the direction of incident light; The boundaries between adjacent bright areas are clear without excessive, which will affect the comfort of human ey...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of lens is that the difference in light transmittance between adjacent bars is fixed, and there is no automatic adjustment function, so it cannot adapt to changes in the direction of incident light; The boundaries between adjacent bright areas are clear without excessive, which will affect the comfort of human eyes. In addition, the light intensity of the surrounding areas of strong light sources is also gradually weakened. If both the strong light area and the sub-strong light area are shaded, it will increase The area of ​​the dark area affects the line of sight. If only the strong light area is blocked, the light entering the sub-strong light area of ​​the human eye cannot be moderately weakened; in addition, the average light transmittance of this type of lens cannot automatically change with the average illuminance of the surrounding environment.

The control methods of these glasses are complex, and their functions must be realized through large, heavy, and expensive electronic control devices. Due to their poor practicability, they have not been commercialized so far.

Images