Display Board Insulating Films and Terminals Short Circuit Protection
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Solution Overview
Problem
In liquid crystal display devices, the thickness of mounted terminals and pixel electrode material can become uneven due to production process errors, leading to alignment issues and potential short circuits between adjacent terminals.
Innovation Solution
A display board design with a non-display area surrounding the display area, featuring multiple insulating films and protective members formed from a transparent electrode film, which helps in reducing the likelihood of short circuits by managing the distance between terminal lines and covering sections prone to residue formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interlayer insulating film is formed with a large thickness, then the short-circuit protection is improved, but the manufacturing precision deteriorates due to uneven exposure and displacement of protrusions
Solution Approach 1:
The insulating film structure is divided into multiple segments: the first insulating film with its edge section, the second insulating film with its edge section closer to terminals, and protective members. This segmentation allows each part to perform specific functions - the first insulating film provides base insulation, the second insulating film enhances protection near terminals where short-circuit risk is higher, and the protective members provide additional localized protection, collectively achieving reliable short-circuit protection without requiring excessive thickness throughout the entire structure.
Solution Approach 2:
The patent applies different insulating structures at different locations based on local requirements. The second insulating film is positioned closer to the terminals where the risk of short-circuit is higher due to potential thickness variations and alignment errors. The protective members are specifically placed at sections of terminal lines not overlapping the second insulating film. This local quality approach provides enhanced insulation where needed most while avoiding the manufacturing precision issues associated with uniformly large thickness throughout.
2Reliability
If the thickness of mounted terminals and pixel electrode material is increased, then the short-circuit protection is improved, but the alignment precision deteriorates due to uneven exposure in production process
Solution Approach 1:
The patent incorporates protective members formed from transparent electrode film in advance during the manufacturing process. These protective members are positioned to cover sections of terminal lines before final assembly, preventing potential short-circuits that could arise from thickness variations in mounted terminals or pixel electrode material. By establishing this protective structure preliminarily, the system achieves reliable short-circuit protection without requiring excessive thickness of the terminal materials themselves, thereby maintaining alignment precision.
3Area of stationary object
If the distance between adjacent terminal lines is reduced, then the area is minimized, but the reliability deteriorates due to increased risk of short-circuit from residue formation
Solution Approach 1:
The protective members act as intermediary elements between adjacent terminal lines. These transparent electrode film structures are positioned to cover sections of terminal lines, particularly those not overlapping the second insulating film. The protective members serve as a physical barrier that prevents residue material from creating conductive paths between closely spaced terminal lines, enabling the board to achieve compact area while maintaining reliable short-circuit protection even when terminal lines are closely spaced.
Data Source
AI summary
An array board includes input terminals, a first interlayer insulating film, a first planarization film, terminal lines, a second planarization film, and protective members. A first interlayer insulating film edge section and a first planarization film edge section are disposed between the input terminals and the display area. The terminal lines in a layer upper than the first planarization film and extending to cross the first interlayer insulating film edge section and the first planarization film edge section are connected to the input terminals. The second planarization film in a layer upper than the terminal lines includes a second planarization film edge section disposed closer to the input terminals relative to the first interlayer insulating edge section and the first planarization film edge section. The protective members in a layer upper than the second planarization film cover sections of the terminals lines not overlapping the second planarization film, respectively.