Pixel Structure With Segmented Drain Electrodes
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Solution Overview
Problem
Conventional pixel structures in liquid crystal displays face a trade-off between increasing storage capacitance and maintaining the aperture ratio, as larger overlapping areas for storage capacitors reduce the display's effectiveness.
Innovation Solution
A pixel structure is designed with two storage capacitors formed by three electrodes, where the drain electrode is split into two portions, allowing for increased capacitance without reducing the aperture ratio by overlapping these capacitors in parallel, and reducing the area covered by each capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the overlapping area of drain electrode and common electrode is increased to increase storage capacitance, then the storage capacitance is improved, but the aperture ratio is reduced
Solution Approach 1:
The drain electrode is divided into two separate portions: a first drain portion that forms a first storage capacitor with the common electrode, and a second drain portion that forms a second storage capacitor with the common electrode. This segmentation allows the storage capacitors to be arranged in parallel while reducing the overlapping area required for each individual capacitor, thereby maintaining a high aperture ratio while achieving sufficient total storage capacitance.
2Device complexity
If a single storage capacitor is formed by overlapping drain and common electrodes, then the structure is simple, but the aperture ratio is reduced due to large overlapping area
Solution Approach 1:
The storage capacitor is segmented into two separate capacitors (first storage capacitor and second storage capacitor) formed by the first and second drain portions respectively. Each capacitor has a smaller overlapping area with the common electrode, and when arranged in parallel, they provide sufficient total capacitance while maintaining a high aperture ratio.
Solution Approach 2:
The first storage capacitor and second storage capacitor are merged in parallel connection to achieve the required total storage capacitance. Both capacitors share the common electrode and are connected to the same node, effectively combining their capacitance values while each occupying a smaller area than a single large capacitor would require.
Data Source
AI summary
The present invention provides a pixel structure including a substrate, a patterned electrode disposed on the substrate, a first insulating layer disposed on the patterned electrode, a common electrode disposed on the first insulating layer, a second insulating layer disposed on the common electrode, and a drain disposed on the second insulating layer. The first insulating layer has a first through hole, and the second insulating layer has a second through hole. The drain includes a first portion electrically connected to the patterned electrode via the first through hole and the second through hole, and a second portion extending onto the common electrode. The common electrode is coupled with the patterned electrode to form a first storage capacitor and is coupled with the second portion to form a second storage capacitor.