Nicked Display Scan-Line Layout for Brightness Uniformity
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Solution Overview
Problem
Conventional display technologies face challenges in maintaining uniform brightness, particularly in display portions with unique shapes, such as those with nicks or notches, due to uneven signal line loads and capacitance differences.
Innovation Solution
The display device incorporates a frame region with routed wires and conductive films in different metal layers, overlapping via an inorganic insulating film, to equalize the drive load across scan signal lines, reducing brightness unevenness by adding capacitance and stabilizing signal pulse waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display region has a nick (cutout) for functional integration, then device functionality and design flexibility are improved, but brightness unevenness occurs between regions with and without nicks
Solution Approach 1:
The patent applies local quality by adding a conductive film specifically in the frame region adjacent to the nick, creating a localized capacitance compensation structure. This targeted approach equalizes the drive load only where needed (near the nick) without affecting other display regions, thereby maintaining brightness uniformity while preserving the functional benefits of the nicked design
2Reliability
If routed wires are extended toward the nick in the frame region, then signal transmission is improved, but capacitance imbalance and brightness unevenness occur
Solution Approach 1:
The conductive film acts as a counterweight to the excessive capacitance introduced by the routed wires extending toward the nick. By positioning the conductive film in the frame region adjacent to the nick, it provides compensating capacitance that balances the overall drive load, counteracting the brightness unevenness caused by the extended signal paths
3Device complexity
If conventional display structures are used without additional conductive films, then device complexity is reduced, but brightness gradients appear between different display regions
Solution Approach 1:
The patent changes the electrical parameter (capacitance) by introducing a conductive film in the frame region. This parameter modification equalizes the drive load across different display regions, particularly compensating for the capacitance imbalance caused by the nick and associated routed wires, thereby eliminating brightness gradients with minimal structural modification
Data Source
AI summary
A nick is disposed in a display region so as to partly cut the display region. A first routed wire is routed from the display region toward the nick. The first routed wire is included in a first metal layer. A first conductive film is included in a second metal layer. The first routed wire and the first conductive film overlap each other via an inorganic insulating film.