Display Substrate Data Line Orientation for Light Leakage Control
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Solution Overview
Problem
Existing display technologies face issues with light leakage and reduced contrast due to the orientation of data lines relative to polarizers, particularly in high-resolution displays like VR and AR products, leading to the screen door effect and decreased aperture ratio.
Innovation Solution
The display substrate design includes data lines oriented perpendicular to the absorption axis of the polarizer, with specific thickness and angle configurations, combined with a light-shielding structure and layered black matrix arrangements, to minimize light leakage and enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data lines are oriented parallel to the absorption axis of the polarizer, then the manufacturing process is simpler, but light leakage increases and contrast decreases
Solution Approach 1:
The patent applies asymmetry by orienting the data line extension direction substantially perpendicular to the absorption axis of the first polarizer, creating an asymmetric angular relationship (approximately 90 degrees) between the data line and polarizer absorption axis. This asymmetric orientation prevents light leakage by ensuring that light polarized by the first polarizer does not align with the data line direction, thereby resolving the contradiction between manufacturing simplicity and light leakage prevention.
2Reliability
If data line thickness is increased, then the electrical conductivity improves, but the aperture ratio decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the data line thickness parameter within the range of 0.14-0.27 times the cell gap (d1/d0). This optimized thickness parameter ensures sufficient electrical conductivity for reliable signal transmission while minimizing the area occupied by the data line, thereby maintaining a high aperture ratio. The specific numerical range represents an optimized balance between conductivity requirements and aperture ratio constraints.
3Measurement precision
If the slope angle of the data line is increased, then the alignment accuracy improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by optimizing the slope angle parameter of the data line to be within the range of 75-90 degrees, with tan α = a*b where a ≥ 2.66 and b is the cell gap. This optimized angular parameter improves alignment accuracy by ensuring the data line is substantially perpendicular to the polarizer absorption axis, while the specific mathematical relationship provides clear manufacturing guidelines that balance precision requirements with manufacturability.
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 design significantly reduces light leakage and improves contrast by up to 38%, increasing the aperture ratio by about 3% and ensuring better process control and alignment accuracy.
Implementation Method 1
a first polarizer located on a side of the first base substrate; and a data line located on a side, away from the first polarizer, of the first base substrate, and an extension direction of the data line is substantially perpendicular to an absorption axis of the first polarizer
Data Source
AI summary
A display substrate, a display panel and a display device, including: a first base substrate, a first polarizer located on one side of the first base substrate, a data line located on a side, away from the first polarizer, of the first base substrate, and the extension direction of the data line is substantially perpendicular to the absorption axis of the first polarizer.