Display Panel Black Matrix Notches Prevent Corner Light Leakage
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Solution Overview
Problem
In liquid crystal display panels, particularly in VA mode, corner light leakage due to terrain variations in film structures leads to reduced contrast and display quality, as the electric field intensity varies across the panel, causing brighter areas in dark states.
Innovation Solution
The display panel design includes a first substrate with a black matrix and a common electrode, and a second substrate with main and sub pixel electrodes, where notches in the black matrix edges and shielding blocks help maintain consistent electric field intensity by increasing spacing distances, preventing light leakage around the light transmitting zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the black matrix is provided on the first substrate to define light shielding zones, then the display structure is formed, but the terrain variation causes non-uniform electric field intensity leading to corner light leakage
Solution Approach 1:
The patent applies local quality by making the common electrode thickness non-uniform, specifically increasing the thickness at corners and edges where light leakage occurs. This local modification compensates for the terrain variation caused by the black matrix pattern, ensuring uniform electric field intensity across the display panel without changing the overall black matrix structure.
Solution Approach 2:
The patent changes the physical parameter of the common electrode thickness to resolve the electric field uniformity issue. By adjusting the thickness parameter of the common electrode at specific locations (corners and edges), the patent compensates for the terrain variation and achieves uniform electric field distribution, thereby preventing corner light leakage.
2Quantity of substance
If the color filter layer is made of great thickness on the second substrate, then the color filter structure is formed, but the distance difference between substrates causes non-uniform electric field intensity
Solution Approach 1:
The patent applies local quality by modifying the common electrode thickness at specific locations (corners and edges) to compensate for the terrain variation caused by the thick color filter layer. This localized adjustment ensures that the electric field intensity remains uniform despite the overall thickness difference between the first and second substrates.
Solution Approach 2:
The patent introduces asymmetry in the common electrode thickness distribution, making it non-uniform with greater thickness at corners and edges. This asymmetric structure compensates for the terrain variation caused by the color filter layer, creating a balanced electric field distribution across the display panel.
3Ease of manufacture
If the distance between conductive layers varies across the panel, then the manufacturing process is simplified, but the electric field intensity becomes non-uniform causing light leakage
Solution Approach 1:
The patent changes the thickness parameter of the common electrode to compensate for the varying distances between conductive layers. By increasing the common electrode thickness at corners and edges, the patent maintains uniform electric field intensity despite the simplified manufacturing process that allows distance variations, thereby preventing light leakage in the dark state.
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 enhances display quality by minimizing light leakage and maintaining consistent electric field intensity, thereby improving contrast and reducing corner light leakage issues.
Implementation Method 1
the electric field may show different intensities in different areas, such that the intensity of the electric field is higher for areas where the distances between the two opposite conductive layers are shorter
Implementation Method 2
since in the area where the electric field is stronger, the rotation of the liquid crystal molecules is greater
Data Source
AI summary
A display panel includes a plurality of pixel units arranged in an array and each including a light transmitting zone and a light shielding zone arranged on a circumference of the light transmitting zone. The display panel includes a first substrate and a second substrate opposite to each other. The first substrate includes a black matrix and a first common electrode covering the black matrix. The black matrix is arranged in the light shielding zone. The second substrate includes a plurality of main pixel electrodes, which correspond, in a one-to-one manner, to the pixel units and face exactly to the light transmitting zones. In each individual pixel unit, the black matrix has edges facing the light transmitting zone and provided with notches. The first common electrode has a first portion that covers the notches and flush with a second portion thereof located in the light transmitting zone.