LCD Array Substrate Electrode Layout for Stable Parasitic Capacitance
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Solution Overview
Problem
Conventional liquid crystal display (LCD) array substrates face issues with parasitic capacitors due to process deviations, leading to increased input voltage, image flickering, and afterimages, as well as a lowered aperture rate and transmittance due to the displacement of the source electrode, which affects the gate source capacitor.
Innovation Solution
The array substrate design includes a gate electrode, a compensation electrode connected to the gate electrode, and a source electrode with a storage capacitor portion and compensation portion disposed on opposite sides, ensuring a constant parasitic capacitor by overlapping parts of the source and compensation electrodes with the gate and compensation electrodes respectively, reducing the occupying area and increasing the aperture rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long arm and compensation portion are added to the source electrode to compensate for parasitic capacitor variation, then the parasitic capacitor remains constant, but the aperture rate decreases
Solution Approach 1:
The patent utilizes multi-layer stacking to relocate the compensation portion from the planar area to the vertical dimension. The source electrode is configured with a compensation portion in a first metal layer that overlaps with a compensation electrode in a second metal layer, enabling parasitic capacitor compensation without occupying additional pixel area, thus resolving the contradiction between capacitor stability and aperture rate.
Solution Approach 2:
The compensation structure is nested within the existing electrode layers. The compensation portion of the source electrode overlaps with the compensation electrode in the adjacent metal layer, creating a compact nested configuration that provides compensation functionality without adding external structures that would reduce the aperture area.
2Reliability
If the source electrode is displaced to the right to compensate for parasitic capacitor, then the parasitic capacitor increases, but the input voltage becomes unstable causing image flickering
Solution Approach 1:
The compensation electrode structure provides a feedback mechanism where the overlapping area between the compensation portion and compensation electrode automatically adjusts to counterbalance variations in the parasitic capacitor. This feedback loop ensures that the total parasitic capacitor remains constant, thereby stabilizing the input voltage and preventing image flickering.
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 maintains a constant parasitic capacitor and increases the aperture rate of the array substrate, thereby reducing image flickering and afterimages while enhancing transmittance by minimizing the occupying space of the source electrode.
Implementation Method 1
the source electrode and the array substrate side common electrode are disposed in different layers, in an extension direction of the source electrode portion, a part of the storage capacitor portion intersecting the source electrode portion at least partially overlaps the array substrate side common electrode
Implementation Method 2
a part of the source electrode portion overlaps the gate electrode, a part of the compensation portion overlaps the compensation electrode to assure that the parasitic capacitor between the source electrode and the gate electrode keeps constant
Data Source
AI summary
The present application provides an array substrate, the array substrate includes a gate electrode, a compensation electrode, an array substrate side common electrode, and a source electrode. Disposing a source electrode portion and a compensation portion of the source electrode on two opposite sides of a storage capacitor portion and connecting the source electrode portion and the compensation portion to the storage capacitor portion can reduce an occupying area of the source electrode to improve an aperture rate of the array substrate.