Array Substrate Color Resin Planarization for Horizontal Driving
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Solution Overview
Problem
Conventional ADS mode TFT-LCD array substrates face issues with light leakage and reduced contrast ratio due to a step between layers, hindering horizontal liquid crystal driving and aperture ratio, especially when combined with a color filter substrate.
Innovation Solution
The array substrate design features a recessed channel part between the source and drain electrodes, a multi-dimensional electric field formed between the common and pixel electrodes, and a color resin layer, eliminating the step and enabling normal horizontal driving with improved contrast ratio and aperture ratio through a reduced number of mask processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a step exists between the TFT structure and the upper surface of the data line, then the manufacturing process is simplified, but horizontal driving of liquid crystal is hindered causing light leakage and reduced contrast ratio
Solution Approach 1:
The patent introduces a color resin layer that fills the step between the TFT structure and data line, transforming a vertical height difference problem into a lateral filling problem. This allows the liquid crystal layer to be formed at a uniform height, enabling proper horizontal driving while maintaining the original TFT structure without additional planarization processes.
2Area of stationary object
If the aperture ratio is increased for small-sized mobile products, then the display area is improved, but the bonding process leads to lowered aperture ratio due to edge bonding conditions
Solution Approach 1:
The color resin layer is formed preliminarily before the liquid crystal layer, filling the step structures and creating a planarized surface. This preliminary action ensures that when the color filter substrate is bonded, the liquid crystal layer maintains uniform thickness and proper horizontal driving capability, compensating for the aperture ratio reduction caused by bonding edges.
3Illumination intensity
If a color filter substrate is added to improve display quality, then the viewing angle and color performance are enhanced, but the manufacturing complexity and process steps increase
Solution Approach 1:
The patent combines the color filter layer with the liquid crystal layer formation process by forming the color resin layer in the same manufacturing steps as the liquid crystal alignment layer. This merging of functions allows the color filter substrate to be integrated without adding separate process steps, maintaining manufacturing efficiency while achieving enhanced display quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for normal horizontal driving of liquid crystals, enhancing contrast ratio and maintaining high aperture ratio, addressing light leakage and manufacturing challenges for both small and large-scale panels.
Implementation Method 1
a multi-dimensional electric field is formed between the common electrode and the pixel electrode when the common electrode and the pixel electrode are applied voltages
Data Source
AI summary
An array substrate, which is formed with a gate electrode (2), a source electrode (5), a drain electrode (6), a gate insulating layer (3), an active layer (4) and a passivation layer (9) in a thin film transistor region, and with the gate insulating layer (3), a pixel electrode (7), the passivation layer (9) and a common electrode (8) in a pixel electrode pattern region, and a color resin layer (11) is formed between the passivation layer (9) and the common electrode (8). Since the color resin layer (11) for planarization is formed on the passivation layer (9), the horizontal driving manner may be suitably applied in order to reduce light leakage, to improve contrast ratio and aperture ratio of a panel and to lower production costs.