Liquid Crystal Display Dummy Pixel Equipotential Connection
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Solution Overview
Problem
Existing liquid crystal displays suffer from display defects and light leakage due to parasitic capacitance differences between outermost and inner data lines, which affect pixel voltage and lead to vertical line defects, and the use of dummy pixel electrodes in non-display areas can cause power consumption issues and rubbing failures.
Innovation Solution
A liquid crystal display design where the dummy pixel electrode is electrically connected to the common line, making it equipotential with the common electrode, thereby eliminating parasitic capacitance and allowing the dummy pixel contact hole to be aligned with the drain contact hole without altering the rubbing position, thus preventing display defects and rubbing failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy pixel electrodes are disposed in non-display areas to compensate parasitic capacitance, then display defects in outermost pixel areas are prevented, but power consumption increases and rubbing failures occur
Solution Approach 1:
The patent connects the dummy pixel electrode to the common electrode through a contact hole, making them equipotential. This eliminates the parasitic capacitance issue without requiring the dummy pixel electrode to be driven at a different voltage, thereby preventing display defects while avoiding the power consumption penalty of actively driving dummy pixels
2Device complexity
If outermost data lines are used without dummy data lines, then device complexity is reduced, but parasitic capacitance differences cause vertical line defects
Solution Approach 1:
The patent uses a dummy data line that is connected to the common electrode, making it equipotential with the common electrode. This eliminates parasitic capacitance differences between outermost and inner data lines, preventing vertical line defects without significantly increasing device complexity
Solution Approach 2:
The dummy data line acts as an intermediary structure that compensates for the parasitic capacitance difference. By connecting it to the common electrode, it serves as a reference that balances the electrical characteristics across the display panel
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 removes parasitic capacitance and prevents display defects and rubbing failures, while maintaining the aperture ratio and reducing power consumption by ensuring the dummy pixel electrode is connected to the common electrode, thereby stabilizing the electric field and improving image quality.
Implementation Method 1
Light is refracted according to the orientation of the liquid crystal molecules due to the optical anisotropy of the liquid crystals, thereby representing image information.
Implementation Method 2
The liquid crystals have an orientation of liquid crystal molecules because of a thin and long structure of the liquid crystals and can control the orientation of the liquid crystal molecules by applying an electric field to the liquid crystals.
Data Source
AI summary
A liquid crystal display preventing a light leakage is disclosed. The liquid crystal display includes gate lines and data lines disposed to cross over each other, a common line crossing over the data lines and disposed in parallel with the gate lines, a dummy data line crossing over the gate lines and disposed in parallel with the data lines, a dummy pixel electrode disposed in a dummy area formed by an outermost data line of the data lines, the dummy data line and first and second gate lines adjacent to each other among the gate lines; a pixel electrode disposed in a pixel area between first and second data lines adjacent to each other among the data lines and the first and second gate lines; and a common electrode disposed to overlap the pixel electrode and the dummy pixel electrode. The dummy pixel electrode is connected to the common line.