Display Panel Viewing Angle Adjustment for Dark State Light Leakage
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Solution Overview
Problem
Liquid crystal display panels experience decreased image contrast and clarity at large viewing angles due to light leakage in the dark state, which current wide-viewing angle compensation polarizers cannot adequately address, especially at horizontal and vertical angles.
Innovation Solution
A method and device that adjust the viewing angle for a dark state by measuring brightness changes at different voltage differences and determining whether the voltage difference acts as a selection or non-selection voltage based on specific thresholds, thereby mitigating light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If wide-viewing angle compensation polarizers are used, then image contrast within certain viewing angle is improved, but light leakage at horizontal and vertical viewing angles in dark state cannot be compensated
Solution Approach 1:
The patent adjusts the pretilt angle parameter of the liquid crystal molecules to optimize the dark state viewing angle characteristics. By changing this physical parameter of the liquid crystal alignment, the patent achieves improved dark state performance at horizontal and vertical viewing angles while maintaining the benefits of compensation polarizers for frontal viewing angles.
2Adaptability or versatility
If viewing angle of liquid crystal display panel is increased, then viewing angle coverage is improved, but image contrast and image clarity continue to decrease
Solution Approach 1:
The patent modifies the pretilt angle parameter to achieve a balance between wide viewing angle coverage and maintained image contrast. This parameter adjustment allows the liquid crystal display to provide broad viewing angles while preserving adequate contrast ratios across the expanded viewing cone.
Solution Approach 2:
The patent employs a composite structure combining liquid crystal layers with compensation polarizers, where the liquid crystal molecules are oriented at specific pretilt angles. This composite approach leverages the complementary properties of liquid crystal birefringence and polarizer optics to achieve both wide viewing angles and acceptable contrast.
3Object-affected harmful factors
If compensation polarizers are used, then light leakage in dark state is reduced for certain viewing angles, but light leakage at horizontal and vertical viewing angles remains
Solution Approach 1:
The patent optimizes the pretilt angle parameter to specifically address dark state light leakage across all viewing angles including horizontal and vertical directions. This parameter tuning enables the liquid crystal display to achieve uniform dark state performance throughout the entire viewing cone when combined with compensation polarizers.
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 method effectively reduces light leakage at large viewing angles in the dark state, improving the display quality of liquid crystal display panels by determining optimal voltage differences for brightness adjustments.
Implementation Method 1
birefringence of liquid crystal molecules in a liquid crystal layer changes with the viewing angles
Implementation Method 2
Wide-viewing angle compensation polarizers are usually used to compensate the viewing angles of display panels
Data Source
AI summary
A method is provided for adjusting a viewing angle for a dark state of a display panel, and the method includes steps of: obtaining a first brightness change of a to-be-tested panel at a first viewing angle under a condition of a first voltage difference; obtaining a second brightness change of the to-be-tested panel at a second viewing angle under the condition of the first voltage difference; obtaining a ratio of the second brightness change to the first brightness change; and comparing the ratio of the second brightness change to the first brightness change with a first threshold to determine whether the first voltage difference is a selection voltage of the display panel.