Display Panel Gate Edge Shielding for Light Leakage
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Solution Overview
Problem
In traditional liquid crystal display panels, a voltage difference between the gate and common electrodes can cause liquid crystals to deflect, leading to light leakage and compromised display quality.
Innovation Solution
The use of a pixel electrode to shield the edge portion of the gate, effectively blocking the electric field between the gate and common electrode, and optimizing the placement of the black matrix to reduce its area and improve aperture ratio and transmittance, while ensuring balanced common voltages across different regions to prevent issues like crosstalk and image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gate and common electrode are disposed with a voltage difference to control liquid crystal, then the liquid crystal can be driven to change orientation, but the voltage difference causes liquid crystal deflection and light leakage
Solution Approach 1:
A shielding electrode is introduced as an intermediary component between the gate electrode and the liquid crystal layer. This shielding electrode is connected to the common electrode potential and creates an equipotential region, mediating the electric field distribution to prevent direct interaction between the gate voltage and liquid crystal that causes deflection and light leakage.
Solution Approach 2:
The shielding electrode is connected to the common electrode to establish an equipotential region between the gate and the liquid crystal layer. By making the shielding electrode and common electrode equipotential, the patent eliminates the voltage difference that causes liquid crystal deflection at the gate edges, thereby preventing light leakage while maintaining liquid crystal control functionality.
2Object-affected harmful factors
If the black matrix area is increased to block light leakage, then light leakage can be reduced, but the aperture ratio and transmittance of the pixel decrease
Solution Approach 1:
The shielding electrode serves as an intermediary that blocks the harmful electric field effect without requiring additional black matrix material. By placing the shielding electrode between the gate and liquid crystal, it prevents light leakage through the gate edge region without occupying pixel aperture area, thus avoiding the trade-off between light leakage prevention and aperture ratio maintenance.
3Object-affected harmful factors
If the pixel electrode is positioned to overlap with the gate edge portion, then the electric field shielding is improved, but the manufacturing precision requirements increase
Solution Approach 1:
By connecting the shielding electrode to the common electrode potential, the patent creates an equipotential barrier that effectively shields the liquid crystal from the gate electrode's electric field. This equipotential design provides a more robust shielding mechanism that is less sensitive to precise alignment variations compared to relying solely on pixel electrode positioning, thereby reducing manufacturing precision requirements while maintaining effective electric field shielding.
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 solution effectively prevents liquid crystal deflection due to voltage differences, enhancing display quality by reducing light leakage, improving aperture ratio, and addressing issues of crosstalk and image sticking.
Implementation Method 1
the pixel electrode is disposed above the gate, the gate comprises a first edge portion disposed adjacent to the pixel electrode, and an orthographic projection of the pixel electrode projected on the first substrate covers an orthographic projection of the first edge portion projected on the first substrate
Data Source
AI summary
The present invention provides a display panel. The display panel includes an array substrate and a color filter substrate disposed opposite to each other. The array substrate includes a first substrate and a plurality of pixel units distributed on the first substrate in an array. The pixel units include a gate disposed on the first substrate and a pixel electrode disposed above the gate. The gate includes a first edge portion disposed adjacent to the pixel electrode, and an orthographic projection of the pixel electrode projected on the first substrate covers an orthographic projection of the first edge portion projected on the first substrate.