LCD Pixel Contact Trenches and Light Shielding for High PPI Crosstalk
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Solution Overview
Problem
High-resolution liquid crystal displays (LCDs) face issues with light leakage and color mixing between sub-pixels, leading to reduced contrast and image quality, particularly in high pixel per inch (PPI) displays.
Innovation Solution
Implementing elongated contact trenches aligned with light polarization and incorporating an additional light shielding layer between neighboring sub-pixels to minimize light leakage and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high PPI is implemented to increase display resolution, then image detail is improved, but light leakage and color mixing between sub-pixels increases
Solution Approach 1:
The patent introduces separate contact trenches for pixel electrodes and data lines, dividing the conductive pathways to prevent light leakage between adjacent sub-pixels. This segmentation of electrical contacts eliminates the harmful light mixing effect while maintaining high PPI display resolution.
Solution Approach 2:
The patent introduces an insulating layer as an intermediary between adjacent sub-pixel contacts. This intermediate layer acts as a barrier that prevents light from leaking between neighboring sub-pixels, thereby maintaining color accuracy and contrast in high PPI displays.
2Device complexity
If conventional contact structures are used to simplify manufacturing, then device complexity is reduced, but light scattering and cross-talk between sub-pixels increase
Solution Approach 1:
The patent segments the contact structure into distinct pixel electrode contacts and data line contacts, each with dedicated trenches. This segmentation prevents light scattering between adjacent sub-pixels while maintaining a manufacturing process that is extensions of conventional LCD fabrication.
Solution Approach 2:
The patent applies different trench configurations locally - pixel electrode contacts have trenches extending in one direction while data line contacts have trenches extending perpendicular to them. This local differentiation optimizes light blocking in each specific area without requiring complete redesign of the entire contact system.
3Ease of manufacture
If standard pixel design is used to maintain manufacturing simplicity, then ease of manufacture is preserved, but contrast ratio and image quality deteriorate due to light leakage
Solution Approach 1:
The patent modifies the standard pixel design by segmenting the contact trenches into separate pixel and data line trenches with perpendicular orientations. This segmentation prevents light leakage paths while using conventional manufacturing techniques, thus maintaining ease of manufacture while improving contrast ratio and image quality.
Solution Approach 2:
The patent changes the orientation parameter of trenches for different contact types - pixel contacts have trenches in one direction while data line contacts have trenches perpendicular to them. This parameter change optimizes light blocking properties without requiring new manufacturing equipment or processes.
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
Enhances display contrast and color accuracy by reducing light scattering and cross-talk, enabling high PPI performance.
Implementation Method 1
a liquid crystal layer disposed between a first substrate and a second substrate, the liquid crystal layer including a plurality of liquid crystal molecules, a plurality of pixel electrodes and a plurality of data lines disposed over the first substrate, the pixel electrodes and the data lines configured to control an orientation of the liquid crystal molecules to modulate light
Implementation Method 2
a passivation layer formed over the first substrate, the passivation layer including at least one of (i) a plurality of first filled elongated contact trenches electrically connecting a plurality of the pixel electrodes, and (ii) a plurality of second filled elongated contact trenches electrically connecting a plurality of the data lines, where the first and second filled elongated contact trenches are configured to reduce light leakage by aligning with a polarization of light
Implementation Method 3
a light shielding layer disposed over abutting portions of adjacent color filters of respective sub-pixels, the light shielding layer configured to inhibit color mixing and block cross-talk between the adjacent sub-pixels
Data Source
AI summary
A liquid crystal display device includes a liquid crystal layer disposed between first a second substrates, the liquid crystal layer including a plurality of liquid crystal molecules, a plurality of pixel electrodes and a plurality of data lines disposed over the first substrate and configured to control the orientation of the liquid crystal molecules to modulate light, a passivation layer formed over the first substrate, the passivation layer including a plurality of first filled elongated contact trenches electrically connecting a plurality of the pixel electrodes and a plurality of second filled elongated contact trenches electrically connecting a plurality of the data lines, a light shielding layer disposed over abutting portions of adjacent color filters of respective sub-pixels, the light shielding layer configured to inhibit color mixing and block cross-talk between the adjacent sub-pixels, and a backlight system configured to provide illumination through the liquid crystal layer.