Light-Emitting Display Routing Layout With Secondary Pad Redundancy
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Solution Overview
Problem
The formation of routing lines in light emitting display panels at a later stage of manufacturing leads to potential errors, resulting in discarded panels and increased damage, especially when connecting substrates with drivers.
Innovation Solution
Incorporation of secondary pads and secondary routing lines to replace damaged routing lines, ensuring redundancy and minimizing non-display areas by integrating gate drivers within the display area, thus reducing the need for lateral connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If routing lines are formed at a later stage of manufacturing to connect substrates with drivers, then the display area can be maximized by reducing non-display areas, but the risk of errors increases leading to discarded panels and increased damage
Solution Approach 1:
The patent applies preliminary action by forming the routing lines between substrates at an earlier stage in the manufacturing process, before the bonding process is completed. This allows routing line errors to be detected and corrected before final assembly, preventing panel discard while still enabling maximized display areas through reduced non-display borders.
2Ease of manufacture
If routing lines are formed at a later stage of manufacturing, then manufacturing flexibility is improved, but manufacturing precision deteriorates due to increased error rates
Solution Approach 1:
The patent resolves this contradiction by performing routing line formation as a preliminary action before substrate bonding. This timing provides both manufacturing flexibility (ability to modify routing before final assembly) and manufacturing precision (errors can be corrected before committing to final assembly), eliminating the trade-off between these two attributes.
3Reliability
If secondary pads and secondary routing lines are added to replace damaged routing lines, then reliability is improved through redundancy, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by forming both primary and secondary routing lines during the same early manufacturing stage, rather than adding secondary routing as a later repair step. This simultaneous formation reduces process complexity while establishing reliability through redundancy, as both routing paths are created under controlled manufacturing conditions rather than through complex post-processing repairs.
Data Source
AI summary
A light emitting display apparatus includes a first substrate including pixels and signal lines arranged in a first direction and a second substrate disposed on a rear surface of the first substrate, wherein a routing portion including routing lines is provided in a first lateral surface of the first substrate and a second lateral surface of the second substrate. In the first substrate, a first pad portion adjacent to the first lateral surface includes first pads connected to the signal lines and the routing lines, a first secondary pad provided between the first pads, and a first connection line provided to overlap the first pads and the first secondary pad. In the second substrate, a second pad portion adjacent to the second lateral surface includes second pads connected to the routing lines, a second secondary pad provided between the second pads, and a second connection line provided to overlap the second pads and the second secondary pad. The routing portion includes a secondary routing line connecting the first secondary pad to the second secondary pad.