Liquid Crystal Azimuthal Angle Optimization for High PPI Displays
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Solution Overview
Problem
As pixel sizes reduce and pixel per inch (ppi) increases in liquid crystal displays, the fringe electric field influences the liquid crystal layer, leading to a decrease in light transmittance due to larger shifts in the average Azimuthal Angle, affecting display quality.
Innovation Solution
A display panel design with a liquid crystal layer between substrates and polarizers, featuring a pixel electrode with intersecting main electrodes and branch electrodes, where the average Azimuthal Angle of the liquid crystal layer in the first domain is optimized within a specific range (e.g., 37-46 degrees) to enhance light transmittance when a maximum voltage is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel sizes reduce and pixel per inch increases, then image resolution is improved, but light transmittance decreases due to larger shifts in average Azimuthal Angle
Solution Approach 1:
The patent applies different Azimuthal Angles to different domains within each pixel. Specifically, the pixel area is divided into multiple domains (first, second, third, and fourth domains), and each domain is assigned a specific Azimuthal Angle range. This local differentiation allows each domain to optimize light transmittance independently, compensating for the overall reduction in light transmittance caused by higher pixel density.
Solution Approach 2:
The patent changes the Azimuthal Angle parameter across different domains to optimize performance. By setting specific Azimuthal Angle ranges for different domains (e.g., first domain: 0°≤ψ<45°, second domain: 45°≤ψ<135°, etc.), the patent adjusts the optical parameters to maintain high light transmittance even when pixel density increases and pixel sizes reduce.
2Measurement precision
If pixel sizes reduce and pixel per inch increases, then image resolution is improved, but display quality deteriorates due to fringe electric field influence
Solution Approach 1:
The patent divides each pixel into multiple domains with different Azimuthal Angles to locally optimize the response to fringe electric fields. By creating directional diversity within each pixel through domain segmentation, the patent reduces the uniform vulnerability to fringe electric field effects that plagues high-density displays.
Solution Approach 2:
The patent introduces asymmetry in the liquid crystal orientation by assigning different Azimuthal Angles to different domains. This asymmetric configuration breaks the uniformity that makes pixels uniformly susceptible to fringe electric fields, thereby improving display quality and reliability in high-resolution displays.
3Illumination intensity
If average Azimuthal Angle is adjusted to optimize light transmittance, then light transmittance increases, but liquid crystal alignment complexity increases
Solution Approach 1:
The patent segments the pixel area into multiple domains, each with a defined Azimuthal Angle range. This segmentation approach simplifies the alignment process by providing clear, discrete orientation targets for each domain, making the complex task of achieving optimal light transmittance more manageable through systematic division.
Solution Approach 2:
The patent establishes specific parameter ranges for Azimuthal Angles in different domains to optimize light transmittance while maintaining controllable alignment complexity. By defining explicit angle ranges (e.g., 0°≤ψ<45°, 45°≤ψ<135°), the patent transforms a complex continuous optimization problem into a more manageable discrete parameter setting task.
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
This configuration effectively increases the overall light transmittance of the display panel by adjusting the average Azimuthal Angle, improving display quality despite increasing pixel density.
Implementation Method 1
the liquid crystal layer has an average Azimuthal Angle (ψ) in the first domain, satisfying B13−0.0013716x2+0.1847682x+41.6722409, and B1=−0.00001x3+0.003335x2−0.387814x+52.96697
Implementation Method 2
a first polarizer, a second polarizer... the liquid crystal layer is disposed between the first substrate and the second substrate
Data Source
AI summary
A display panel including a first polarizer, a second polarizer, a first substrate, a second substrate, a liquid crystal layer, and a pixel array is provided. The pixel array disposed on the first substrate includes a pixel area wherein a pixel electrode is disposed. The pixel electrode includes a first main electrode, a second main electrode, which substantially perpendicularly intersecting for defining a first domain, a second domain, a third domain, and a fourth domain of the pixel area, and a plurality of branch electrodes separately connected to the first or the second main electrode. When a maximum voltage is applied to the display panel, the liquid crystal layer has an average Azimuthal Angle represented as y1, satisfying B1<y1<A1, A1=0.0000025x3−0.0013716x2+0.1847682x+41.6722409, and B1=−0.00001x3+0.003335x2−0.387814x+52.96697; wherein x represents the pixel per inch of the display panel.