Display Panel Polarized Pattern Layer Light Leakage
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Solution Overview
Problem
Current liquid crystal display panels with polarizers on both substrates suffer from light leakage due to phase differences in different wavelengths, leading to poor dark state quality and a blueish appearance, as the absorption axes of polarizers corresponding to different color filter patterns are in the same direction.
Innovation Solution
The display panel incorporates a first, second, and third polarized pattern layer with metal wires arranged in different directions, allowing for multiple absorption axes, which are integrated with a color filter layer and liquid crystal layer to enhance contrast and dark state quality by adjusting the angles and directions of the metal wires and wave plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polarizers are entirely adhered on the same display panel with absorption axes in the same direction, then the structure is simple and easy to manufacture, but light leakage occurs for lights of different wavelengths and dark state quality deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the absorption axis directions for different color filter patterns. Specifically, the first polarized pattern layer has a first absorption axis direction for red sub-pixels, a second absorption axis direction for green sub-pixels, and a third absorption axis direction for blue sub-pixels. This localized differentiation eliminates light leakage for different wavelengths while maintaining manufacturing feasibility through a systematic approach.
Solution Approach 2:
The patent segments the polarized pattern layer into multiple regions corresponding to different color filters. The color filter layer is divided into first, second, and third filter patterns for red, green, and blue colors respectively, with each having its own polarized pattern layer with specifically oriented absorption axes. This segmentation allows targeted optimization for each wavelength range.
2Device complexity
If polarizers are entirely adhered on the same display panel with absorption axes in the same direction, then the device structure is simplified, but dark state quality deteriorates and the display panel appears blueish
Solution Approach 1:
The patent implements local quality by assigning different absorption axis directions to polarized pattern layers corresponding to different color filters. The first polarized pattern layer (red) has its absorption axis at a different angle than the second (green) and third (blue) polarized pattern layers. This localized differentiation suppresses dark state light leakage for each wavelength range, eliminating the blueish appearance while maintaining a manageable device structure.
Solution Approach 2:
The patent introduces angular/directional dimension to the polarizer configuration. Instead of using a single absorption axis direction for all polarizers, the invention varies the absorption axis directions in the angular dimension across different color regions. This dimensional change enables selective suppression of light leakage for different wavelengths without significantly increasing overall structural complexity.
3Object-affected harmful factors
If multiple polarized pattern layers with different absorption axis directions are used, then contrast between lights of different wavebands is improved and dark state quality is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges multiple functional layers into an integrated structure. The color filter layer and polarized pattern layers are combined such that each color filter region has its corresponding polarized pattern layer with matched absorption axis direction. This merging approach achieves wavelength-selective light leakage suppression while presenting a unified, manageable device structure rather than separate independent systems.
Solution Approach 2:
The patent creates a universal structure where each combined unit of color filter layer and polarized pattern layer serves multiple functions: color filtering, polarization, and wavelength-specific light leakage suppression. This multi-functionality is achieved through the coordinated design where the polarized pattern layer both filters light by polarization and provides wavelength-selective suppression, reducing the need for separate dedicated components for each function.
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 increases contrast between different wavebands and improves dark state quality by reducing brightness of short and long wavelength lights passing through, achieving a 60% to 88% reduction in dark state brightness and enhancing overall display panel performance.
Implementation Method 1
The first polarized pattern layer includes a first upper polarized pattern, a second upper polarized pattern, and a third upper polarized pattern. The first upper polarized pattern is disposed in correspondence to the first filter pattern and includes a plurality of metal wires arranged along a first direction. The second upper polarized pattern is disposed in correspondence to the second filter pattern and includes a plurality of metal wires arranged along a second direction. The third upper polarized pattern is disposed in correspondence to the third filter pattern and includes a plurality of metal wires arranged along a third direction.
Implementation Method 2
The first upper polarized pattern, the second upper polarized pattern, and the third upper polarized pattern include two or more absorption axes of different directions, and therefore the contrast between lights of different wavebands can be increased and dark state quality of the display panel can be improved.
Data Source
AI summary
A display panel includes an active device substrate, an opposite substrate, a liquid crystal layer, a color filter layer, and a first polarized pattern layer. The color filter layer includes a first filter pattern, a second filter pattern, and a third filter pattern. The first polarized pattern layer includes a first upper polarized pattern, a second upper polarized pattern, and a third upper polarized pattern. The first upper polarized pattern is disposed in correspondence to the first filter pattern and includes a plurality of metal wires arranged along a first direction. The second upper polarized pattern is disposed in correspondence to the second filter pattern and includes a plurality of metal wires arranged along a second direction. The third upper polarized pattern is disposed in correspondence to the third filter pattern and includes a plurality of metal wires arranged along a third direction.