LCD Aperture Ratio via Integrated Storage Hole
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Solution Overview
Problem
The aperture ratio of LCD display substrates is reduced due to the need for large marginal areas around the output terminal and storage line to prevent mismatch between holes and features, which is exacerbated by the use of organic insulation layers.
Innovation Solution
The solution involves forming a hole through the organic insulation layer that extends from the contact area of the drain electrode to the storage line, reducing the marginal areas needed and improving the overlap between the drain electrode and storage line, thereby enhancing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large marginal areas are provided around the output terminal and storage line, then mismatch between holes and features is prevented, but the aperture ratio of each pixel is reduced
Solution Approach 1:
The patent merges the functions of the first hole (for output terminal connection) and the second hole (for storage line connection) into a single integrated hole structure. This combined hole extends from the pixel electrode through the organic insulation layer to reach both the output terminal and the storage line, eliminating the need for separate holes and their associated marginal areas, thereby increasing the aperture ratio while maintaining precise positioning.
Solution Approach 2:
The single hole structure serves multiple functions: it provides electrical connection between the pixel electrode and the output terminal, establishes connection to the storage line for capacitor charging, and eliminates the need for separate alignment margins. This multi-functional design resolves the contradiction by achieving precise positioning without requiring additional marginal areas that would reduce the aperture ratio.
2Shape
If organic insulation layer is used to planarize the substrate surface, then surface flatness is improved, but the aperture ratio is undesirably reduced due to increased marginal area requirements
Solution Approach 1:
The patent combines the alignment functions for both holes into a single hole structure that passes through the organic insulation layer. This eliminates the need for separate alignment margins that would be required if two distinct holes were formed, thereby maintaining surface flatness provided by the organic insulation layer while maximizing the aperture ratio.
3Manufacturing precision
If separate holes are formed for output terminal and storage line connections, then precise location of each feature is achieved, but the marginal areas required reduce the aperture ratio
Solution Approach 1:
The patent integrates the positioning function for both the output terminal connection and storage line connection into a single hole. This unified hole structure is positioned to simultaneously align with both features, eliminating the need for separate marginal areas around each hole and thereby increasing the aperture ratio while maintaining precise location accuracy for both connections.
Data Source
AI summary
A display substrate includes respective pluralities of gate lines, data lines, switching elements, storage lines, pixel electrodes, and an organic insulation layer. The gate lines and the data lines define a plurality of unit pixels. The storage lines are respectively formed adjacent to the respective drain electrodes of the respective switching elements of respective rows of the unit pixels. The organic insulation layer has a hole that is formed within the area of each of the unit pixels and that extends from a contact area formed at a portion of the corresponding drain electrode of the pixel to a portion corresponding to the storage line thereof. This arrangement enables the marginal area needed to prevent mismatch of the hole in the areas of the contact area and the storage line to be reduced, thereby increasing the aperture ratio of the display.