Array Substrate Shield Plate Electric Field Interference
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Solution Overview
Problem
In liquid crystal display devices, the electric field from the shield plate affects the pixel electrode, leading to edge shading and dark lines at the edges of sub-pixels, which reduces transmittance.
Innovation Solution
The array substrate design includes a pixel electrode with a frame and branches, where the second side portion is located between the first side portion and the shield plate, forming a storage capacitor with the capacitor plate, and through holes are strategically placed to reduce the influence of the shield plate's electric field on the pixel electrode, thereby improving edge shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the shield plate is used to control the electric field at the edge of sub-pixels, then the dark state display is improved, but edge shading and dark lines appear due to electric field interference with the pixel electrode
Solution Approach 1:
A second common electrode is introduced as an intermediary component between the shield plate and the pixel electrode. This second common electrode acts as a buffer to shield the pixel electrode from the electric field of the shield plate, thereby reducing edge shading and dark lines while maintaining the dark state display performance
Solution Approach 2:
The shield plate, first common electrode, and second common electrode are all maintained at the same potential (ground potential). This equipotential configuration ensures that no voltage difference exists between these electrodes, preventing unwanted electric fields from forming and interfering with the pixel electrode, thus eliminating edge shading while preserving the dark state function
2Device complexity
If the first common electrode is positioned close to the pixel electrode for compact design, then device integration is improved, but electric field interference causes dark lines at sub-pixel edges
Solution Approach 1:
The second common electrode serves as a buffer layer positioned between the first common electrode and the pixel electrode. This intermediary structure allows the electrodes to be positioned closely for compact integration while preventing direct electric field interference that would cause dark lines
Solution Approach 2:
By maintaining all common electrodes and the shield plate at the same potential, the patent eliminates voltage differences that would create harmful electric fields, enabling close positioning of components without causing dark line defects
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 configuration effectively reduces the impact of the shield plate's electric field on the pixel electrode, enhancing light transmission and minimizing edge dark lines, thus improving the transmittance and display quality of the panel.
Implementation Method 1
forming a storage capacitor with the capacitor plate
Data Source
AI summary
An array substrate of this application includes: a first common electrode, including a shield plate; a pixel electrode, insulated from the first common electrode and including a frame surrounded by an orthographic projection of the shield plate and a branch surrounded by the frame. The branch is connected to the frame. The frame includes a first side portion and a second side portion separated from each other. The first side portion is connected to the branch. The second side portion is located between the first side portion and the shield plate. Optionally, the first common electrode further includes a capacitor plate connected to the shield plate, and a storage capacitor is formed by the capacitor plate and the second side portion.