Base Plate Distance Adjustment Layer Reduces Coupling Capacitance
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Solution Overview
Problem
Conventional color-filter on array (COA) substrates in liquid crystal displays suffer from high coupling capacitance between pixel electrodes and data lines, which affects display quality.
Innovation Solution
Incorporating a distance adjustment layer between the first and second passivation layers in the substrate structure, increasing the distance between the pixel electrode and the data line, thereby reducing coupling capacitance through a through hole that penetrates the passivation layers and the color filter layer, and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional color-filter on array structure is used, then the manufacturing process is simplified, but the coupling capacitance between pixel electrode and data line becomes large
Solution Approach 1:
The patent introduces a distance adjustment layer in the vertical dimension (z-direction) between the first and second passivation layers. This increases the vertical distance between the pixel electrode and data line, thereby reducing coupling capacitance without affecting the horizontal integration of the color filter on array structure
Solution Approach 2:
The distance adjustment layer acts as an intermediary structure between the first passivation layer and second passivation layer. It provides physical separation and increases the distance between conductive elements, reducing parasitic capacitance while maintaining the overall COA structure
2Object-affected harmful factors
If the distance between pixel electrode and data line is increased, then coupling capacitance is reduced, but the device structure becomes more complex
Solution Approach 1:
The distance adjustment layer is formed using the same mask patterns as the existing passivation layers and color filter layers. This allows the distance adjustment function to be integrated into the existing manufacturing process without requiring additional masking steps or complex alignment procedures
Solution Approach 2:
The patent combines the distance adjustment function with the existing passivation and color filter layer structures. The distance adjustment layer is integrated between the first and second passivation layers, merging multiple functions into a unified structure that reduces capacitance while maintaining manufacturing simplicity
Data Source
AI summary
A base plate, comprising: a substrate; an array switch formed on the substrate; a first passivation layer formed at the array switch; a second passivation layer located on the first passivation layer; at least one color filter layer formed between the first passivation layer and the second passivation layer; a distance adjustment layer formed between the first passivation layer and the second passivation layer so as to increase a distance between the first passivation layer and the second passivation layer; and a pixel electrode layer formed on the second passivation layer, the pixel electrode layer being electrically connected to the array switch by means of a via penetrating the first passivation layer, the color filter layer, the distance adjustment layer, and the second passivation layer.