Electro-optical Device Phase Difference Optimization
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Solution Overview
Problem
Existing electro-optical devices with λ/4 phase difference elements suffer from light leakage and reduced contrast ratio when circularly polarized light is incident, due to phase changes caused by side surface reflections, which cannot be effectively mitigated while maintaining orientation order of liquid crystal molecules.
Innovation Solution
Incorporating first and second phase difference elements with a phase difference of 0<R<λ/4, where R is the phase difference and λ is the wavelength of incident light, between polarizing elements and the liquid crystal panel, to modulate light and prevent orientation defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a λ/4 phase difference element is arranged between the polarizing element and the liquid crystal panel, then the modulation property is improved and orientation disorder is suppressed, but light leakage occurs due to phase change from side surface reflection, reducing the contrast ratio
Solution Approach 1:
The patent changes the phase difference parameter from the conventional λ/4 to a specific range (λ/8 < phase difference ≤ λ/4) to optimize the balance between suppressing orientation disorder and preventing light leakage. This parameter optimization resolves the contradiction by finding the optimal point where both modulation property and contrast ratio are maintained
Solution Approach 2:
Instead of using the full λ/4 phase difference which causes excessive phase change and light leakage, the patent applies a partial phase difference (less than λ/4 but greater than λ/8) that provides sufficient suppression of orientation disorder while avoiding the harmful effects of complete quarter-wave compensation
2Reliability
If the phase difference is increased to suppress orientation disorder, then the modulation property is improved, but the contrast ratio is reduced due to increased light leakage from phase changes
Solution Approach 1:
The patent optimizes the phase difference parameter to a specific range (λ/8 < phase difference ≤ λ/4) that balances two competing requirements: suppressing orientation disorder (requiring higher phase difference) and maintaining contrast ratio (requiring lower phase difference to reduce light leakage). This parameter optimization resolves the contradiction between modulation property and contrast ratio
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 suppresses the reduction of contrast ratio while minimizing the influence of liquid crystal orientation disorders, enhancing image quality by controlling light emission and absorption effectively.
Implementation Method 1
each of the first phase difference element and the second phase difference element has a phase difference R that satisfies a condition that λ/8<R≤λ/4
Implementation Method 2
a transmissive liquid crystal panel arranged between the pair of polarizing elements. Light being linearly polarized light passes through a polarizing element on an incidence side, enters the liquid crystal panel, and is emitted from the liquid crystal panel
Implementation Method 3
A transmissive electro-optical device includes a pair of polarizing elements and a transmissive liquid crystal panel arranged between the pair of polarizing elements
Data Source
AI summary
In an electro-optical device, a first polarizing element, a first phase difference element, a transmissive liquid crystal panel, a second phase difference element, and a second polarizing element are sequentially arranged. Here, when a phase difference of the first phase difference element and the second phase difference element is λ/4, an influence of orientation disorder of liquid crystal molecules can be alleviated, but a contrast ratio is reduced. Therefore, when a wavelength of incident light is λ, a phase difference R of the first phase difference element and the second phase difference element satisfies the following condition that 0<R<λ/4, preferably λ/12<R<λ/6. For example, it is assumed that the phase difference R is λ/8.