Array Substrate Groove Structure for Dark Line Suppression
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Solution Overview
Problem
The formation of dark lines at the edge of sub-pixels in liquid crystal display panels due to the interaction between electric fields on the pixel and common electrodes affects transmittance, as the electric field on the pixel electrode is influenced by the shielding electrode plate.
Innovation Solution
The array substrate design includes a pixel electrode with a frame and branch, and a first common electrode with a side plate featuring a shielding electrode plate and a groove opposite to the orthographic projection of the branch, increasing the distance between the shielding electrode plate and the frame, thereby weakening the influence of the electric field on the branch and reducing dark lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shielding electrode plate is placed close to the pixel electrode to improve shielding effect, then the edge light leakage is reduced, but the electric field interference causes dark lines at the sub-pixel edge
Solution Approach 1:
The patent introduces a groove structure as an intermediary element between the shielding electrode plate and the pixel electrode. This groove acts as a mediator that spatially separates the electric fields of the two electrodes, reducing their direct interaction while maintaining the shielding effect. The groove structure allows the shielding electrode plate to remain close to the pixel electrode for effective light leakage prevention, while simultaneously reducing electric field interference that causes dark lines.
2Object-generated harmful factors
If the distance between the shielding electrode plate and the pixel electrode is increased to reduce electric field interference, then dark lines are reduced, but the shielding effect weakens and edge light leakage increases
Solution Approach 1:
The patent solves the distance contradiction by transitioning from a one-dimensional distance adjustment to a three-dimensional structural solution. Instead of simply increasing or decreasing the horizontal distance between electrodes, the invention introduces a vertical dimension through the groove structure. The groove creates a stepped configuration where the shielding electrode plate can be positioned at different heights, allowing simultaneous optimization of both shielding effect and electric field interference reduction.
3Object-generated harmful factors
If the groove is made deeper to further reduce electric field interference, then dark lines are further suppressed, but the storage capacitor area is reduced
Solution Approach 1:
The patent applies parameter optimization by establishing specific dimensional ranges for the groove structure. The groove depth, width, and position are optimized within defined parameters to achieve the best balance between dark line suppression and storage capacitor area maintenance. By controlling the groove depth within a specific range, the invention reduces electric field interference effectively while minimizing the impact on capacitor area.
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 suppresses the dark line phenomenon by reducing the electric field interference, improving the transmittance of the display panel by maintaining a stable voltage supply through storage capacitors and varying the tilt directions of liquid crystal molecules for enhanced viewing angles.
Implementation Method 1
the electric field on the pixel electrode may be easily affected by the electric field on the first common electrode (shielding electrode plate), and dark lines may be formed at the edge of the sub-pixel
Implementation Method 2
the capacitor electrode plate and the frame forming a storage capacitor
Data Source
AI summary
An array substrate includes a pixel electrode and a first common electrode. The pixel electrode has a frame and a branch. An edge plate of the first common electrode includes a shielding polar plate that surrounds the orthographic projection of the frame. The side of the edge plate facing the branch is provided with a groove.