Display Substrate Corner Slits for Water Resistance and Narrow Frames
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Solution Overview
Problem
Existing display devices face issues with water ingress through organic films, leading to degradation of display quality, particularly in the corner parts of the display region, due to the formation of slits that compromise the protective functions of the organic film and require additional light shielding, making it difficult to reduce the frame section area.
Innovation Solution
The solution involves forming slits in the organic film at the corners of the substrate, which do not overlap the circuit section, and using an inorganic light shielding member to cover the slits, ensuring protection of the conductor pattern while minimizing water ingress and maintaining the frame section's width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slit is formed in the organic film to surround the periphery of the display region, then water ingress is reduced, but the protective function of the organic film is compromised and additional light shielding is required
Solution Approach 1:
The continuous organic film is segmented by forming slits at corner parts, creating discrete barrier sections that block water ingress paths while maintaining overall film integrity. The slit configuration divides the water barrier function into multiple segments that work together to prevent water penetration.
Solution Approach 2:
The organic film is modified locally at corner parts where slits are formed, concentrating water resistance enhancement at critical vulnerability points. The light shielding member is also applied locally only at slit positions rather than across the entire frame, optimizing resource usage while maintaining functionality.
2Reliability
If the organic film is formed as a protective film and light shielding film, then protection and light shielding functions are provided, but water easily enters via the inside of the organic film or interface
Solution Approach 1:
The solution combines the organic film with an inorganic light shielding member to create a composite structure. The organic film provides baseline protection and flexibility, while the inorganic light shielding member adds enhanced water resistance and light blocking capabilities, creating synergistic protective functionality.
Solution Approach 2:
The light shielding member acts as an intermediary layer between the organic film and the external environment, providing an additional barrier against water ingress. This intermediate layer reinforces the organic film's protective function without replacing it, creating a multi-layer defense system.
3Reliability
If measures are taken to maintain organic film function in the slit portion, then protection is maintained, but the frame section area cannot be reduced
Solution Approach 1:
Instead of applying light shielding across the entire frame section, the solution applies light shielding members only at the specific locations where slits are formed. This partial action approach provides necessary protection at critical points while minimizing the total area occupied by additional components, allowing frame section reduction.
4Reliability
If the slit is formed in the organic film, then the distance of water entrance path increases, but the function required for the organic film cannot be exhibited in the slit portion
Solution Approach 1:
The physical state of the organic film is changed by introducing slits, transforming it from a continuous barrier to a segmented structure with controlled openings. This parameter change increases the tortuous path for water molecules, effectively increasing the water entrance path distance while maintaining the film's protective characteristics in non-slit areas.
Data Source
AI summary
To improve the display quality of a display device, the display device includes a display section and a frame section surrounding a periphery of the display section. A substrate in the display device includes a conductor pattern constituting a circuit section and an insulating film serving as an organic film covering the conductor pattern. The insulating film extends to a peripheral edge of the substrate. A slit, which penetrates the insulating film in a thickness direction, is formed in a corner part of the insulating film. The slit is formed at a position not overlapping the circuit section.