Display Panel Storage Capacitor Structure for Charge Retention
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Solution Overview
Problem
The current COA technology for display panels results in a small storage capacitor, leading to rapid charge leakage on the pixel electrode, affecting the display effect due to a larger distance between electrode plates.
Innovation Solution
A manufacturing method for display panels that involves forming a source electrode, drain electrode, and channel on a substrate, followed by multiple color photoresists, a gate electrode, and a common electrode, with a second insulation layer having a through hole for the pixel electrode to contact the source electrode, reducing the distance between electrode plates and increasing the storage capacitor capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the color photoresist is formed on the TFT substrate using COA technology, then the alignment error between pixel and color photoresist is eliminated and resolution is improved, but the distance between electrode plates of storage capacitor increases causing capacitance to become very small
Solution Approach 1:
The patent introduces a new structural dimension by forming the common electrode in a different plane/location relative to the pixel electrode. Specifically, the common electrode is formed on the color photoresist layer while the pixel electrode is formed on the pixel definition layer, creating a vertical stacking arrangement that reduces the horizontal distance between electrodes while maintaining COA manufacturing benefits
Solution Approach 2:
The patent segments the electrode structure into distinct functional layers: the pixel electrode is separated from the common electrode by intermediate layers (pixel definition layer and color photoresist layer). This segmentation allows each electrode to be positioned optimally for its function while reducing the effective distance for capacitance formation
2Ease of manufacture
If the distance between electrode plates of storage capacitor is increased to accommodate COA manufacturing, then manufacturing simplicity is improved, but charge leakage increases and display effect deteriorates
Solution Approach 1:
By transitioning to a vertical stacked electrode arrangement, the patent achieves both manufacturing simplicity and improved charge retention. The common electrode on the color photoresist and pixel electrode on the pixel definition layer are positioned closer in the vertical dimension while maintaining ease of COA manufacturing
Solution Approach 2:
The patent implements a nested structure where the pixel electrode is positioned within the vertical space defined by the color photoresist layer and pixel definition layer, with the common electrode nested on the color photoresist. This nested arrangement reduces the distance between electrodes while maintaining manufacturing simplicity
Data Source
AI summary
A display panel and manufacturing method. The method includes: forming a source electrode, a drain electrode and a channel on a substrate; depositing a first insulation layer; forming multiple color photoresists on the first insulation layer, and the source electrode, the drain electrode and the channel are located between two adjacent color photoresists; forming a gate electrode and a common electrode by a same process, and the gate electrode is located on the first insulation layer, and the common electrode is located on the photoresist; forming a second insulation layer having a through hole communicated with the source electrode on the gate electrode and the common electrode; forming a pixel electrode on the second insulation layer. The pixel electrode contacts with the source electrode through the through hole, and a storage capacitor is formed. The storage capacitor can be increased and the current leakage of the pixel electrode improved.