Display Panel Polarizer-Retardation Layout for Hue Uniformity
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Solution Overview
Problem
Existing display panels experience uneven hue and are adversely affected by ambient light due to the shrinkage of polarizing layers, particularly under strong lighting conditions, which compromises display quality.
Innovation Solution
Incorporating a retardation layer on the display substrate with a polarizer having an absorption axis parallel or perpendicular to its stretching direction and an included angle other than 0° or 90°, combined with multiple retardation films to uniformly distribute shrinkage forces and reduce ambient light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is added to block ambient light, then the display clarity under strong light is improved, but the hue uniformity deteriorates due to shrinkage forces
Solution Approach 1:
A retardation layer is introduced as an intermediary component between the polarizer and the display substrate. This retardation layer compensates for the optical path difference caused by the polarizer's shrinkage, thereby maintaining hue uniformity while the polarizer continues to block ambient light effectively.
Solution Approach 2:
The patent adjusts the optical parameters of the retardation layer, specifically its retardation amount and orientation angle, to compensate for the shrinkage-induced optical path differences. By changing these parameters, the system maintains consistent hue across the display while preserving the polarizer's light-blocking function.
2Strength
If the polarizer shrinks to improve adhesion, then the bonding strength is improved, but the optical axis distortion increases causing hue non-uniformity
Solution Approach 1:
The retardation layer serves as a compensatory intermediary that counteracts the optical axis distortion caused by polarizer shrinkage. It maintains the overall optical performance by introducing an opposing optical path difference that restores hue uniformity across the display.
Solution Approach 2:
The patent converts the harmful effect of polarizer shrinkage (optical axis distortion) into a beneficial configuration by deliberately designing the retardation layer to match and compensate for this distortion. The shrinkage-induced optical path difference is transformed into a predictable parameter that can be optically compensated.
3Stability of the object's composition
If a thick adhesive layer is used to reduce shrinkage impact, then the structural stability is improved, but the device thickness increases
Solution Approach 1:
Instead of increasing adhesive layer thickness, the patent changes the optical parameters of the retardation layer (retardation amount and orientation) to compensate for shrinkage effects. This approach maintains structural stability while avoiding the penalty of increased display thickness.
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 alleviates uneven hue and enhances display clarity by uniformly distributing shrinkage forces and minimizing ambient light reflection, improving the display effect under various lighting conditions.
Implementation Method 1
a retardation layer, provided on a display side of the display substrate
Implementation Method 2
a polarizer, provided on a side of the retardation layer away from the display substrate, where a direction of an absorption axis of the polarizer is parallel or perpendicular to a stretching direction of the polarizer
Data Source
AI summary
A display panel comprises a display substrate, a phase difference layer and a polarizer. The phase difference layer is disposed on a display side of the display substrate. The polarizer is disposed on one side of the phase difference layer which is away from the display substrate. The direction of the absorption axis of the polarizer is parallel to or perpendicular to the stretching direction of the polarizer, and the included angle between the absorption axis of the polarizer and the optical axis of the phase difference layer is not equal to 0° or 90°.