Compensation Layer Dispersion for Liquid Crystal Phase Retardation
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Solution Overview
Problem
Horizontal electric field display panels, such as those in ADS and IPS modes, suffer from dark-state light leakage, empurple, and color cast issues when bent or pressed, due to the amplification of phase differences by the liquid crystal layer, which affects the offset of polarization states generated by the substrates.
Innovation Solution
A display panel design featuring an array substrate and an opposite substrate with a liquid crystal layer in between, where a compensation layer is strategically placed with dispersion characteristics opposite to the liquid crystal layer, ensuring the sum of phase retardations through both layers is an integral multiple of the light wavelength, thereby compensating for phase differences and reducing light leakage and color cast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal layer is used in horizontal electric field display mode, then wide viewing angle and high aperture ratio are achieved, but dark-state light leakage and color cast occur when bent or pressed
Solution Approach 1:
A compensation layer is introduced as an intermediary element between the liquid crystal layer and the substrate. This compensation layer has opposite dispersion characteristics to the liquid crystal layer, acting as a mediator to offset the phase differences generated by the liquid crystal molecules when the display is bent or pressed, thereby eliminating dark-state light leakage and color cast while preserving the wide viewing angle characteristics
2Manufacturing precision
If the liquid crystal layer thickness is increased to improve display resolution, then phase retardation is enhanced, but light leakage and empurple issues are worsened
Solution Approach 1:
The dispersion characteristics parameter of the compensation layer is changed to be opposite to that of the liquid crystal layer. By adjusting the dispersion characteristics rather than the thickness parameters, the phase retardation is optimized to reduce light leakage and empurple effects while maintaining the display resolution achieved through appropriate liquid crystal layer thickness
3Reliability
If a compensation layer with opposite dispersion characteristics is added, then phase compensation is improved, but device complexity increases
Solution Approach 1:
The compensation layer is designed to perform multiple functions simultaneously: it provides phase compensation for the liquid crystal layer, corrects color cast, prevents light leakage, and enables the display to function properly on curved surfaces. By consolidating these functions into a single layer with opposite dispersion characteristics, the overall device complexity is minimized while achieving reliable phase compensation
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 effectively improves dark-state light leakage and empurple issues while enhancing color uniformity, allowing for the application of ADS display mode on curved surfaces by maintaining phase compensation across a wider wavelength range.
Implementation Method 1
dispersion characteristics of the liquid crystal layer and the compensation layer are the opposite of each other
Implementation Method 2
the sum of a phase retardation of light passing through the compensation layer and a phase retardation of light passing through the liquid crystal layer is an integral multiple of a light wavelength
Data Source
AI summary
Provided are a display panel and a method for preparing same, and a display apparatus. The display panel includes an array substrate and an opposite substrate, which are oppositely arranged, and a liquid crystal layer, which is arranged between the array substrate and the opposite substrate, wherein a compensation layer is arranged on the array substrate or the opposite substrate, and an included angle between an optical axis direction of the compensation layer and an initial optical axis direction of liquid crystal molecules in the liquid crystal layer is less than or equal to 10 degrees; dispersion characteristics of the liquid crystal layer and the compensation layer are the opposite of each other.