Notched Pixel Electrode for TFT-LCD Point Discharge
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Solution Overview
Problem
In TFT-LCD display devices, the rectangular shape of pixel electrodes leads to point discharge at opposite corners, causing non-uniform charge distribution and affecting image uniformity.
Innovation Solution
The introduction of notches at the corners of pixel electrodes, specifically designed to reduce point discharge by altering the electric field interference and charge distribution, with options for notch shape and placement to optimize uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pixel electrode is formed with a rectangular shape to simplify the production process, then the manufacturing complexity is reduced, but point discharge occurs easily at opposite corners causing non-uniform charge distribution
Solution Approach 1:
The patent applies asymmetry by modifying the symmetric rectangular shape of the pixel electrode to include notches at specific corners. This asymmetric modification eliminates the point discharge problem at opposite corners while maintaining manufacturing simplicity. The notched structure creates an asymmetric charge distribution pattern that prevents the harmful point discharge effect.
Solution Approach 2:
The patent applies local quality by introducing notches only at specific corner positions of the pixel electrode rather than modifying the entire structure. This localized modification targets the specific problem areas (opposite corners where point discharge occurs) while leaving the rest of the electrode structure simple and easy to manufacture.
2Manufacturing precision
If notches are provided at corners of pixel electrodes to reduce point discharge, then charge distribution uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The asymmetric notch configuration is strategically designed to break the symmetry that causes point discharge. By placing notches at specific corners rather than all corners, the structure becomes asymmetric in a controlled way that improves charge distribution uniformity while adding minimal complexity to the overall device structure.
Solution Approach 2:
The local quality principle is applied by introducing structural complexity only where needed (at the corners where point discharge occurs) rather than throughout the entire pixel electrode. This localized approach improves charge distribution uniformity while keeping the overall device structure as simple as possible.
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
The notched pixel electrodes enhance the uniformity of charge distribution, reducing point discharge and improving the display effect by ensuring consistent light intensity across the screen.
Implementation Method 1
an electric field is generated between the pixel electrode and the common electrode. Under the action of the electric field, the liquid crystal molecules corresponding to a position of the pixel electrode are deflected
Implementation Method 2
point discharge occurs easily on the position of opposite corners between two adjacent pixel electrodes
Data Source
AI summary
The embodiments of the present invention provide an array substrate and a display device, which can reduce the phenomenon of point discharge for the pixel electrode. The array substrate comprises a plurality of pixel units; a pixel electrode is provided in each pixel unit; wherein at least one corner of at least one pixel electrode is provided with a notch.