TN Display Panel Electrode Layout for Lower Light Leakage
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Solution Overview
Problem
Twisted nematic (TN) display products have a significant disadvantage in contrast ratio compared to ADS products, and they suffer from light leakage issues due to the alignment of metal lines and orientation layers, which affects the display's contrast and overall performance.
Innovation Solution
The display panel design includes a substrate with specific arrangements of common electrode lines, gate lines, data lines, pixel electrode layers, and orientation layers, where the angles between the extending directions of these lines and the rubbing directions of the orientation layers are carefully controlled to range from 0 degrees to 30 degrees or from 60 degrees to 90 degrees, thereby reducing light leakage and improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If twisted nematic display structure is used, then response time and transmittance are improved, but contrast ratio deteriorates due to light leakage from metal depolarization
Solution Approach 1:
The patent changes the geometric parameters by setting specific angle ranges (0-30 degrees or 60-90 degrees) between the extending directions of common/gate lines and the rubbing direction of orientation layers. This parameter optimization reduces metal depolarization and light leakage while preserving the fast response time and high transmittance characteristics of TN displays
Solution Approach 2:
The patent introduces asymmetric angle arrangements where the extending directions of conductive lines are deliberately positioned at specific non-standard angles relative to the rubbing direction. This asymmetric configuration disrupts the symmetry that causes metal depolarization, thereby reducing light leakage without compromising display performance
2Ease of manufacture
If conventional line arrangement is used, then manufacturing is simpler, but light leakage increases due to metal depolarization
Solution Approach 1:
The patent specifies precise angular parameters (0-30 degrees or 60-90 degrees) for the arrangement of common electrode lines, gate lines, and orientation layers. By controlling these geometric parameters, the patent reduces metal depolarization and light leakage while maintaining compatibility with conventional manufacturing processes
3Ease of operation
If standard orientation layer rubbing direction is used, then alignment is easier, but contrast ratio decreases due to increased light leakage
Solution Approach 1:
The patent optimizes the rubbing direction parameter of the first orientation layer by setting it at specific angles (0-30 degrees or 60-90 degrees) relative to the extending directions of common and gate lines. This parameter adjustment reduces light leakage and improves contrast ratio while maintaining practical alignment capabilities
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 effectively reduces light leakage and enhances the contrast of the display panel, leading to improved display performance and reduced sawtooth effects in the display.
Implementation Method 1
a liquid crystal layer on a side of the first orientation layer away from the substrate
Implementation Method 2
an angle between an extending direction of the common electrode line and a rubbing direction of the first orientation layer ranges from 0 degrees to 30 degrees or from 60 degrees to 90 degrees
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes: a substrate, a common electrode line, a gate line, a first insulating layer, a data line, a second insulating layer, a pixel electrode layer, a first orientation layer, a liquid crystal layer, a second orientation layer, and a common electrode layer; wherein an angle between an extending direction of the common electrode line and a rubbing direction of the first orientation layer ranges from 0 degrees to 30 degrees or from 60 degrees to 90 degrees, and an angle between an extending direction of the gate line and the rubbing direction of the first orientation layer ranges from 0 degrees to 30 degrees or from 60 degrees to 90 degrees.