Pixel Structure Using Protrusion for Display Aperture Ratio
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Solution Overview
Problem
Conventional display panels face challenges in increasing aperture ratio and resolution due to the need for contact holes in the passivation layer to connect the pixel electrode with the drain electrode of the thin film transistor device, which limits the size of the contact hole and affects the display's performance, especially in small size panels.
Innovation Solution
The use of an insulating protrusion or a single-layered conductive protrusion as an electrical connection interface between the pixel electrode and the drain electrode, eliminating the need for contact holes in the passivation layer, allowing for improved aperture ratio and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed in the passivation layer to connect the pixel electrode with the drain electrode, then electrical connectivity is achieved, but the aperture ratio and resolution are reduced due to the minimum hole size constraint
Solution Approach 1:
The patent transitions from a planar contact hole structure to a three-dimensional protrusion structure. The drain electrode is extended to form a protrusion that rises above the passivation layer surface, creating a vertical electrical connection path. This dimensional change allows the pixel electrode to contact the drain electrode through the top surface of the protrusion rather than through a hole in the passivation layer, thereby eliminating the aperture ratio penalty associated with contact holes while maintaining reliable electrical connectivity.
2Reliability
If contact holes are formed in the passivation layer, then electrical connection is established, but the manufacturing process becomes more complex and difficult
Solution Approach 1:
The patent merges the drain electrode formation process with the protrusion structure creation. The drain electrode material is deposited and patterned to simultaneously form both the planar drain electrode region and the elevated protrusion structure. This consolidation eliminates the need for separate contact hole formation steps, including photolithography patterning, etching, and subsequent filling operations, thereby significantly simplifying the manufacturing process while ensuring reliable electrical connection between the pixel electrode and drain electrode.
Data Source
AI summary
A pixel structure and a display panel are provided. The pixel structure uses an insulation protrusion with a drain electrode extending thereon or a single-layered conductive protrusion as an electrical connection interface between the drain electrode and a pixel electrode. The aperture ratio and resolution are increased for no contact hole is required to be formed in the passivation layer.