Reference Voltage Line Groove Design for Display Devices
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Solution Overview
Problem
The layout design of driving circuits in display devices affects display quality, and existing technologies struggle to optimize signal transmission lines effectively, leading to issues with contact impedance and signal depletion.
Innovation Solution
A display device design featuring a substrate with a first reference voltage line and a second reference voltage line, where the second reference voltage line overlaps and contacts the first reference voltage line through a groove in the insulation layer, optimizing the contact surface area to improve signal transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference voltage lines are designed with overlapping structure to increase contact area, then the signal transmission quality is improved, but the manufacturing precision requirements increase due to the need for precise groove positioning
Solution Approach 1:
The patent divides the reference voltage line into two separate lines (first reference voltage line and second reference voltage line) that overlap with each other. The insulation layer is segmented to expose only the contact portion of the first reference voltage line through the groove, while the first covered portion remains insulated. This segmentation allows the lines to be manufactured separately with standard precision, then positioned to overlap, resolving the manufacturing precision issue while maintaining improved contact area for signal transmission.
Solution Approach 2:
The insulation layer is designed with differential coverage: the contact portion of the first reference voltage line is exposed through the groove to enable electrical contact, while the first covered portion is insulated to prevent unwanted connections. This local quality differentiation allows the overlapping structure to function properly without requiring the entire line structure to be manufactured with ultra-high precision, as only the groove positioning needs precision while other areas can use standard manufacturing tolerances.
2Reliability
If the contact surface area between reference voltage lines is increased to reduce contact impedance, then the signal transmission efficiency is improved, but the device complexity increases due to the additional groove structure in the insulation layer
Solution Approach 1:
The patent utilizes the vertical dimension by creating a groove that penetrates through the insulation layer to expose the contact portion. This dimensional approach allows the second reference voltage line to contact the first reference voltage line through the groove while the first covered portion remains insulated above. This resolves the contradiction by achieving increased contact area (improved signal transmission) without requiring complex lateral routing or additional connection structures, as the groove provides a straightforward vertical access path.
3Stability of the object's composition
If the first covered portion is insulated to prevent peeling, then the structural stability is improved, but the contact surface area is reduced which worsens signal transmission
Solution Approach 1:
The insulation layer is designed with differential coverage: the contact portion is exposed through the groove to enable electrical contact for signal transmission, while the first covered portion is insulated to provide structural stability and prevent peeling. This local quality differentiation resolves the contradiction by allowing the insulated first covered portion to maintain structural integrity while the exposed contact portion through the groove ensures adequate contact surface area for reliable signal transmission.
Data Source
AI summary
A display device including a substrate, first and second reference voltage lines, a first insulation layer is provided. The first and second reference voltage lines are disposed in a peripheral area of the substrate. The first insulation layer having a groove is disposed on the first reference voltage line. The groove extends along a first direction and exposes a contact portion of the first reference voltage line. The first insulation layer covers a first covered portion of the first reference voltage line. The second reference voltage line contacts the contact portion at the groove and has a contact surface. In a second direction, a first width W1 of the contact surface, a second width W2 of the first reference voltage line and a third width W3 of the first covered portion are complied with 1 μm≤W1≤(W2−W3), wherein than 0 and smaller than W2.