Display Pad Layout for Selective Bump Compression Measurement
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Solution Overview
Problem
Current foldable display devices face challenges in improving emission characteristics due to limitations in measuring compression resistance of bump parts, which affects the space utilization and efficiency of flexible printed circuit boards and driving integrated circuits.
Innovation Solution
The display device incorporates a flexible printed circuit board and a driving integrated circuit with bump parts connected to control parts, each including switching transistors, allowing for selective measurement of compression resistance using a reduced number of test points, thereby enhancing emission characteristics by securing space for the flexible printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of test points are used to measure compression resistance of bump parts, then measurement precision is improved, but device complexity and space utilization deteriorate
Solution Approach 1:
The patent divides the bump parts into multiple groups, where each group is connected to a common test point through control parts (switching transistors). This segmentation allows multiple bump parts to be measured using fewer test points while maintaining measurement precision through selective grouping and control.
Solution Approach 2:
The patent employs switching transistors as control parts that can dynamically connect or disconnect test points from bump parts based on measurement requirements. This dynamic control enables flexible measurement configurations, allowing the same test point to measure different bump parts at different times, thereby reducing the total number of test points needed.
2Measurement precision
If more test points are added for comprehensive measurement, then measurement coverage is improved, but aperture ratio and bezel width deteriorate
Solution Approach 1:
By segmenting bump parts into groups that share common test points, the patent reduces the total number of test points required, thereby freeing up display area and improving aperture ratio while still maintaining comprehensive measurement coverage through the controlled grouping system.
Solution Approach 2:
Each test point is designed to serve multiple bump parts through the switching control mechanism, making the test point universal. This multi-functionality allows a single test point to measure multiple bump parts sequentially, reducing the overall number of test points needed and preserving more display area.
3Measurement precision
If traditional measurement methods are used, then measurement completeness is improved, but space utilization for flexible printed circuit board deteriorates
Solution Approach 1:
The dynamic switching capability allows the measurement system to be reconfigured for different measurement needs, enabling comprehensive measurement coverage with fewer physical test points, thereby reducing the pad area required and improving space utilization for the flexible printed circuit board and other components.
Data Source
AI summary
A display device includes: a substrate including a display area and a pad area, the pad area being located around the display area and adjacent to one side of the display area; a flexible printed circuit board disposed in the pad area on the substrate and including a first bump part and a plurality of test points connected to the first bump part; a driving integrated circuit disposed in the pad area on the substrate, spaced apart from the flexible printed circuit board and including a second bump part; a signal line disposed in the pad area on the substrate and connecting the first bump part and the second bump part; and a plurality of control parts disposed in the pad area on the substrate and connected to the signal line between the first bump part and the second bump part.