Pixel Structure Storage Capacitor Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pixel structures face a trade-off between increasing storage capacitor capacitance and maintaining a high aperture ratio, as enlarging the conductive layers to enhance capacitance reduces the pixel structure's aperture ratio.
Innovation Solution
The design includes a substrate with a first and second patterned conductive layer, where the common electrode line is electrically connected to the first patterned layer through contact windows, and a pixel electrode with isolated parts to form capacitances, allowing for equivalent storage capacitance with reduced area occupation and increased aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the areas of the first patterned conductive layer and the second patterned conductive layer are increased to increase storage capacitor capacitance, then the capacitance of the storage capacitor is improved, but the aperture ratio of the pixel structure is reduced
Solution Approach 1:
The pixel electrode is divided into multiple isolated parts (first part, second part, third part, etc.) that are electrically isolated from each other. Each part can be independently connected to different conductive layers, allowing the storage capacitor to utilize multiple discrete conductive regions rather than requiring a single large continuous layer. This segmentation enables the same capacitance to be achieved with smaller total area occupation.
Solution Approach 2:
The patent introduces a multi-layer conductive structure with first, second, and third patterned conductive layers at different vertical levels. The storage capacitor is formed by combining these layers in a three-dimensional arrangement, where the first patterned layer connects to the first part of the pixel electrode, the second patterned layer connects to the second part, and the third patterned layer connects to the third part. This vertical stacking in another dimension allows increased capacitance without proportionally increasing the planar area, thereby maintaining a high aperture ratio.
2Quantity of substance
If the areas of the conductive layers are increased to increase storage capacitor capacitance, then the capacitance is improved, but the area occupied by the storage capacitor is increased
Solution Approach 1:
The patent embeds multiple patterned conductive layers within each other in a nested configuration. The first patterned conductive layer is positioned at a lower level, the second patterned layer is positioned at an intermediate level, and the third patterned layer is positioned at an upper level. These layers are nested vertically within the same horizontal footprint, allowing the storage capacitor to accumulate capacitance through the stacked arrangement without expanding the lateral area occupied by the capacitor structure.
Data Source
AI summary
A pixel structure includes a substrate, a first and a second patterned conductive layers, and a pixel electrode. The first patterned conductive layer, disposed on the substrate, includes at least one scan line, at least one gate, and at least one common electrode line. The second patterned conductive layer, disposed on the first patterned conductive layer, includes at least one data line, at least one source/drain, and at least one first patterned layer partly disposed on the common electrode line. The pixel electrode, disposed on the second patterned conductive layer, includes at least one first part and one second part. The first part partly covers the first patterned layer and the common electrode line. The second part, connected to the source/drain, covers the other part of the first patterned layer. The first and second patterned layers compose at least one first capacitance.