Liquid Crystal Lens Electrode Array for Stable Potential Distribution
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Solution Overview
Problem
Existing large-aperture liquid crystal lenses face challenges in achieving stable and ideal potential distribution due to the complexity of driving multiple electrodes independently, and the instability of high-resistance films used in these lenses.
Innovation Solution
The implementation of an electrode array with circular electrode holes and transparent circular electrodes, where the spacing between adjacent conductive lines is optimized to be below 100 μm, allowing for a smoother voltage distribution by applying driving voltages to the opposite ends of the conductive lines, reducing the need for excessive electrode lead-outs and avoiding abrupt potential changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If multiple concentric circular ring electrodes are used to achieve large-aperture liquid crystal lens, then the aperture is improved, but the device complexity increases due to requiring numerous electrodes to be independently driven with voltage
Solution Approach 1:
The patent merges multiple independent electrode functions into a single planar electrode structure with conductive patterns. Instead of using multiple concentric circular ring electrodes that require independent voltage control, the invention uses one planar electrode with integrated conductive regions that can be controlled by fewer voltage signals, thereby reducing device complexity while maintaining large aperture capability
Solution Approach 2:
The planar electrode is segmented into multiple conductive regions with different conductive properties (high-resistance and low-resistance regions) that are spatially distributed across the electrode plane. This segmentation allows different regions to perform different functional roles in shaping the electric field distribution, enabling complex lens functionality with simpler electrode structure
2Area of moving object
If high-resistance films are used to achieve large-aperture liquid crystal lens, then the aperture is improved, but the reliability deteriorates due to unstable resistance and difficulty in ensuring uniformity
Solution Approach 1:
The patent applies local quality by creating regions with different conductive properties within the same planar electrode. High-resistance regions and low-resistance regions are spatially distributed to perform different functions: high-resistance regions provide stable potential distribution while low-resistance regions ensure adequate current flow. This local differentiation resolves the contradiction by allowing the electrode to simultaneously achieve large aperture with reliable electrical characteristics
Solution Approach 2:
The planar electrode uses composite conductive structure combining high-resistance and low-resistance material regions. This composite approach allows the electrode to exhibit both high-resistance properties (for stable potential distribution across large aperture) and low-resistance properties (for reliable electrical connection and current flow), thereby improving overall reliability
3Area of moving object
If concentric circular ring electrode structure is used, then the aperture is improved, but the ease of operation worsens due to abrupt potential changes and complex driving process
Solution Approach 1:
The patent implements equipotentiality by designing the planar electrode with conductive patterns that create smooth potential gradients across the liquid crystal layer. The conductive regions are arranged to ensure continuous and gradual potential changes from center to edge, eliminating the abrupt potential changes that occur with concentric ring electrodes. This results in smoother operation and easier control of the liquid crystal lens
Data Source
AI summary
A liquid crystal lens, a driving method, eyeglasses, an electronic product, a VR device, and an AR device are provided. The liquid crystal lens comprise a liquid crystal layer, a first electrode layer, a second electrode layer, a first transparent substrate, and a second transparent substrate. The first and second electrode layers are respectively located on opposite sides of the liquid crystal layer. The first transparent substrate is positioned on side of the first electrode layer opposite to the liquid crystal layer, and the second transparent substrate is positioned on the side of the second electrode layer opposite to the liquid crystal layer. The second electrode layer includes a first electrical connector, a second electrical connector, and several conductive wires. The driving method of the liquid crystal lens is simple and can achieve an ideal potential distribution, unaffected by variations in the characteristics of high-resistance films.