Display Device Surface Energy Preprocessing for Planarization
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Solution Overview
Problem
As display devices demand larger display areas and higher resolutions, signal delays such as RC delay become inevitable, leading to insufficient data signal charging in pixels, which deteriorates display quality. Increasing wire thickness to address this issue can result in defects like disconnections and abnormal liquid crystal movement, compromising display flatness and performance.
Innovation Solution
A display device and manufacturing method that involve preprocessing substrates and conductive layers to achieve specific surface energy differences, minimizing peak-to-valley thickness variations in insulating layers, thereby improving planarization and reducing the likelihood of defects while maintaining aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wire thickness is increased to reduce RC delay, then signal charging capability is improved, but display flatness deteriorates due to increased steps and abnormal liquid crystal movement
Solution Approach 1:
The patent changes the surface energy parameter of the conductor through preprocessing treatments (such as plasma treatment or chemical treatment) to reduce its surface energy below that of the substrate. This parameter change enables the insulating layer to form a more uniform thickness distribution over the conductor, reducing peak-to-valley variations and improving display flatness while maintaining the thicker wire configuration needed for signal charging
Solution Approach 2:
The patent applies preliminary preprocessing treatments to both the substrate and the conductor before forming the insulating layer. These preliminary actions modify the surface energy characteristics of the conductor in advance, ensuring that when the insulating layer is deposited, it automatically forms with reduced thickness variations without requiring additional planarization steps
2Speed
If wire thickness is increased to address RC delay, then signal transmission is improved, but manufacturing reliability deteriorates due to increased probability of disconnections
Solution Approach 1:
By changing the surface energy parameter of the conductor through preprocessing, the patent creates optimal adhesion conditions for the insulating layer. This reduces the likelihood of disconnections and manufacturing defects while allowing the use of thicker wires for improved signal transmission
3Manufacturing precision
If aperture ratio is maintained while improving signal charging, then display quality is preserved, but wire thickness must increase causing flatness issues
Solution Approach 1:
The patent decouples the relationship between wire thickness and flatness by introducing surface energy as a controllable parameter. This allows the use of thicker wires for signal charging while maintaining good aperture ratio control and achieving acceptable flatness through the modified surface energy characteristics of the conductor
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
The approach enhances display flatness by reducing peak-to-valley thickness differences in insulating layers, preventing defects like disconnections and improving liquid crystal display performance by maintaining high aperture ratios and reducing signal delays.
Implementation Method 1
performing a preprocess to a substrate for a surface energy of the substrate... performing a preprocess to the conductive layer for a surface energy of the conductive layer lower than the surface energy of the substrate
Implementation Method 2
a peak to valley which is a difference between a maximum thickness corresponding to the conductor and a minimum thickness corresponding to the substrate associated with patterning is minimized for an improved planarization
Data Source
AI summary
Provided are a display device and a method of manufacturing of the display device. The display device includes a substrate subjected to a primary preprocess; a conductor formed on the substrate and subjected to a secondary preprocess; and an insulating layer formed on the substrate and the conductor, in which the primary preprocess is performed for a surface energy of the first substrate higher than a first reference value and the secondary preprocess is performed for a surface energy of the conductor lower than a second reference value.