Liquid crystal lens, lens module and near-to-eye display equipment

Abstract

The invention provides a liquid crystal lens, a lens module and near-to-eye display equipment. A first substrate and a second substrate of the liquid crystal lens are oppositely arranged, a liquid crystal layer is located between the first substrate and the second substrate, a first electrode is located on the surface, facing the liquid crystal layer, of the first substrate, and a second electrode is located on the surface, facing the liquid crystal layer, of the second substrate. The first electrode comprises m electrode units, the m electrode units are arranged at intervals, the optical path difference of an optical path difference distribution curve, corresponding to the width of each electrode unit, of the liquid crystal lens is larger than zero and smaller than or equal to lambda / n, lambda is the wavelength of incident light, m is a positive integer larger than or equal to 1, n is a positive integer larger than or equal to 3, and n is a positive integer larger than or equal to 3. The liquid crystal lens has good diffraction efficiency, the inclination angle of liquid crystal molecules can be adjusted by changing the voltage value of the electrode unit, and therefore the refractive index distribution of the liquid crystal lens is changed, and the focal power of the liquid crystal lens is changed so as to change the virtual image distance.

Description

technical field [0001] The present application relates to the field of liquid crystal technology, in particular, to a liquid crystal lens, a lens module and a near-eye display device. Background technique [0002] At present, most of the common light and thin Augmented Reality (AR) display optical systems use the folded optical path method, and the position of the lens is mechanically adjusted to achieve the effect of adjusting the diopter and compensating for the visual defects of the wearer. However, the mechanical adjustment method cannot adjust the distance of the virtual image in real time, resulting in convergence conflicts and easily causing dizziness and fatigue. However, the use of electromechanical automatic zooming will cause the VR display device to be bulky and take a long time to zoom, which cannot meet the reaction time of the human eye. At present, there is a solution to adjust the virtual image distance by using a liquid crystal lens, but the optical path di...

AI Technical Summary

Problems solved by technology

However, the mechanical adjustment method cannot adjust the distance of the virtual image in real time, resulting in convergence conflicts and easily causing dizziness and fatigue; while the use of electromechanical automatic zooming will result in a large VR display device and a long zooming time, which cannot meet the reaction time of the human eye

At present, there are plans to use liquid crystal lenses to adjust the virtual image distance, but the optical path difference (Optical Path Difference, OPD) distribution curve generated by the electrodes of the current liquid crystal lenses cannot well meet the requirements of optical design.

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