Liquid Crystal Display Panel Frame Region Planarized Film Thickness
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Solution Overview
Problem
In liquid crystal display panels, the formation of an acrylic resin film above external wiring in the frame region creates uneven surfaces, leading to contact defects between terminal electrodes and external elements due to dispersed pressure, and without this film, the external wiring is vulnerable to damage during manufacturing.
Innovation Solution
A display panel design with a planarized film having a thinner thickness than in the display region is used in the frame region, allowing for reliable connection of terminal electrodes to external elements through anisotropic conductive films while protecting the external wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an acrylic resin film is formed above the external wiring in the frame region to protect the wiring and reduce parasitic capacity, then the protective function and electrical performance are improved, but uneven surfaces are created leading to contact defects between terminal electrodes and external elements
Solution Approach 1:
The patent applies different film thickness configurations in different regions: a first insulating film with first thickness is formed above the external wiring, while a second insulating film with second thickness (different from first thickness) is formed above the terminal electrode. This local differentiation ensures that the wiring region receives adequate protection and electrical performance optimization, while the terminal electrode region maintains proper contact alignment with external elements, thereby resolving the contradiction between protective function and contact precision.
2Stability of the object's composition
If the acrylic resin film is formed with uniform thickness across the frame region, then the protective function is consistent, but the height difference causes pressure dispersion and connection failures
Solution Approach 1:
The patent implements local quality differentiation by forming the first insulating film with a specific thickness above the external wiring and the second insulating film with a different thickness above the terminal electrode. This approach sacrifices overall film uniformity to ensure connection reliability in the critical terminal electrode region, while maintaining adequate protection in the wiring region.
3Strength
If the acrylic resin film thickness is increased to better protect the external wiring, then the protective capability is enhanced, but the height difference and surface unevenness increase causing contact defects
Solution Approach 1:
The patent resolves this contradiction by applying the local quality principle: the first insulating film with optimized thickness is formed above the external wiring to provide adequate protection, while the second insulating film with different thickness is formed above the terminal electrode to maintain contact precision. This localized thickness differentiation allows each region to have the film thickness optimized for its specific function.
Data Source
AI summary
A liquid crystal display panel includes a thin film transistor disposed on an insulating substrate in a display region, an external wiring for connecting the thin film transistor to a terminal electrode, and a planarized film disposed on the thin film transistor, and having a planarized upper surface. The planarized film is not disposed, or a planarized film having a smaller film thickness than that of the planarized film in the display region is disposed, above the external wiring in a frame region.