Reflective Wire Grid Polarizer for LCD Light Recycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal displays (LCDs) are inefficient due to high light absorption by polarizers, leading to energy loss and electromagnetic interference from various circuits, which affects display performance and sensitivity.
Innovation Solution
A method for manufacturing a polarizer apparatus with a wire array of optically reflective and electrically conductive lines, where the conductive lines have asymmetric heights and form symmetric pairs, providing both improved light recycling and electromagnetic shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If absorptive polarizers are used in LCDs, then light polarization is achieved, but more than 50% of the backlight light is absorbed and converted into heat, leading to energy loss
Solution Approach 1:
The patent converts the harmful absorbed light into beneficial reflected light by using wire grid structures. Instead of absorbing light and converting it to heat (harmful), the wire grids reflect the unwanted polarization component back through the liquid crystal layer, where it can be converted to the desired polarization state and reused, thereby benefiting from what would otherwise be wasted light energy
Solution Approach 2:
The patent changes the fundamental parameter of polarizer operation from absorption-based to reflection-based. By transforming the mechanism from absorptive to reflective, the system achieves polarization while preserving light energy, directly addressing the energy loss problem of traditional absorptive polarizers
2Use of energy by moving object
If wire grid polarizers are used to improve light utilization, then light reflection and transmission are enhanced, but manufacturing complexity increases due to precise feature size requirements for visible spectrum coverage
Solution Approach 1:
The patent moves the wire grid structure from a two-dimensional planar pattern to a three-dimensional configuration with controlled height and spacing. This dimensional transformation allows the wire grids to function as reflective elements rather than merely absorptive patterns, achieving polarization through reflection while maintaining manufacturability through standard lithography and deposition processes
3Adaptability or versatility
If multiple circuits are integrated in LCDs to provide various functions, then display functionality is enhanced, but electromagnetic interference increases, affecting display performance and sensitivity
Solution Approach 1:
The patent makes the wire grid polarizer structure serve multiple functions simultaneously: it provides light polarization through reflection, acts as an electromagnetic shielding layer to block interference between circuits, and maintains optical performance. This multi-functionality allows the same structure to address both display functionality and EMI protection without requiring separate components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances energy efficiency by recycling light that would otherwise be absorbed and reduces electromagnetic noise, improving the overall performance and sensitivity of LCDs without adding cost or thickness.
Implementation Method 1
wire grid polarizers, which are based on transmission and reflection, have a higher utilization rate of the light generated by a backlight unit
Implementation Method 2
electromagnetic waves having an electric field oriented orthogonal to the wires are transmitted through the polarizer. Light having electric field that is parallel to the wires is reflected or more precisely, radiated off of the wires
Data Source
AI summary
A method for manufacturing a polarizer apparatus is described. The method includes forming a patterned resist structure having lines with a top surface and two or more side surfaces; depositing a conductive material over the patterned resist structure, wherein the conductive material is provided at the top surface and the two or more side surfaces, and wherein a layer structure is formed; and etching the layer structure to remove the conductive material from the top surface of the lines to form conductive lines of the conductive material at the two or more side surfaces.