Conductive Pattern Sheet Transition Region for Glazing Optical Distortion
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Solution Overview
Problem
Conductive pattern sheets with variable power density in glazings cause undesirable optical effects such as poor visual appearance and optical distortion, known as 'shimmer' or 'heat haze', due to sharp changes in conductive line width or height.
Innovation Solution
A conductive pattern sheet with a transition region where the resistance per unit length gradually changes over a predetermined length, reducing the rate of change to minimize optical distortion, using a polymer substrate and etched conductive material with variable width, height, or cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conductive line width or height is sharply changed to achieve variable power density, then heating effectiveness is improved, but optical distortion and visual appearance deteriorate
Solution Approach 1:
The patent applies parameter changes by introducing a transition region where the conductive line dimensions (width or height) gradually change rather than sharply transitioning. This gradual parameter change maintains variable power density while reducing optical distortion and shimmer effects, directly resolving the technical contradiction between heating effectiveness and optical quality.
Solution Approach 2:
The patent implements local quality by creating different regions with different characteristics: constant dimension regions for efficient heating and transition regions for optical quality. Each region has locally optimized properties, allowing the conductive pattern to simultaneously achieve variable power density and minimize optical distortion in different areas.
2Power
If conductive line width or height is sharply changed to achieve variable power density, then heating effectiveness is improved, but visual appearance deteriorates
Solution Approach 1:
The patent uses parameter changes to create a gradual transition in conductive line dimensions within transition regions. This gradual change prevents sharp visual boundaries and maintains aesthetic appearance while still achieving the desired variable power density distribution for effective heating.
Solution Approach 2:
The patent applies local quality by designing different regions with different functions: constant dimension regions optimized for heating efficiency and transition regions optimized for visual appearance. This local optimization allows the conductive pattern to maintain both heating effectiveness and visual appeal.
3Object-affected harmful factors
If transition region length is increased to reduce optical distortion, then optical quality is improved, but manufacturing precision requirements change
Solution Approach 1:
The patent defines specific parameter ranges for transition region length (0.1mm to 5.0mm) to balance optical quality and manufacturing feasibility. By establishing concrete parameter specifications, the patent makes the gradual transition concept practically implementable while maintaining optical distortion reduction benefits.
Data Source
AI summary
The invention concerns a conductive pattern sheet for use in a glazing, comprising a substrate, a conductive pattern arranged on the substrate, wherein the conductive pattern comprises first and second busbars arranged at opposing edges of the conductive pattern for connecting a power supply thereto, a plurality of conductive lines each conductive line arranged between the first and second busbars, wherein at least a portion of the plurality of conductive lines is configured to have a transition region wherein a change from a first resistance per unit length (R1) at a first end of the transition region to a second resistance per unit length (R2) at a second end of the transition region occurs over a predetermined length (L) of the transition region wherein a rate of change of resistance per unit length (R1-R2)/L is from 1 to 16,000 ohms per centimetre squared and the substrate is a polymer sheet.