Display Driver Chip Bump Layout for Early Defect Detection
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Solution Overview
Problem
Display devices suffer from defects in the driving chip, which are not effectively detected, leading to potential failures and reduced reliability.
Innovation Solution
The display device incorporates a driving chip with dummy bumps, detection bumps, and connection lines that allow for the detection of defects by measuring the waveform or level of control signals applied to output bumps, thereby delaying the occurrence of chip defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving chip is used in a display device, then the display function is enabled, but defects in the driving chip are not effectively detected leading to potential failures
Solution Approach 1:
The patent applies preliminary action by incorporating detection bumps and dummy bumps into the driving chip structure before actual operation. These bumps are pre-configured to detect defects early in the operational lifecycle, allowing the system to identify potential failures before they affect display functionality. The detection bumps are electrically connected to monitor voltage levels, enabling proactive defect detection rather than waiting for actual failures to occur.
Solution Approach 2:
The patent uses detection bumps as intermediary elements between the driving chip's internal circuitry and the external monitoring system. These detection bumps serve as mediators that translate internal electrical states into measurable voltage signals that can be monitored externally. The dummy bumps further act as intermediaries to isolate and identify specific defect locations by comparing expected versus actual voltage readings.
2Reliability
If multiple bumps (dummy bumps, detection bumps, output bumps) are added to the driving chip, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated bump structure. The driving chip contains both output bumps for normal operation and detection bumps for defect monitoring, along with dummy bumps for isolation, all within the same physical component array. This merging allows defect detection functionality to be added without requiring separate external monitoring hardware, thereby improving reliability while controlling overall device complexity.
Solution Approach 2:
The bumps in the driving chip are designed with multi-functionality. Each bump can serve as an output bump for normal display operation or as a detection bump for defect monitoring, depending on its electrical connection configuration. The dummy bumps provide additional universal functionality by serving as reference points for both operational testing and defect isolation. This multi-functionality reduces the need for separate dedicated components.
3Measurement precision
If detection bumps and connection lines are added to monitor control signals, then early defect detection is enabled, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the driving chip's bump structure into distinct functional segments: output bumps for normal operation, detection bumps for monitoring, and dummy bumps for isolation. Each segment is electrically connected through specific transistors and connection lines, allowing independent functionality. This segmentation enables precise defect detection by isolating specific regions while maintaining ease of manufacturing through modular electrical connections that can be implemented using standard semiconductor fabrication processes.
Data Source
AI summary
A display device includes: a substrate including a display area and a non-display area positioned around the display area and including a pad area adjacent to one side of the display area, a light emitting element disposed in the display area on the substrate, a pad portion disposed in the pad area on the substrate and including a plurality of output pads, a driving chip, and a control signal line. The driving chip includes a base portion facing the substrate, overlapping the pad area, and including dummy bump areas, an output bump area positioned between the dummy bump areas, and a data output area positioned between the dummy bump areas, a plurality of dummy bumps attached to a lower surface of the base portion and overlapping the dummy bump areas and the output bump area, respectively, a plurality of output bumps attached to the lower surface of the base portion, overlapping the output bump area, and connected in parallel to each other through transistors, and a plurality of detection bumps attached to the lower surface of the base portion, each of the detection bumps is electrically connected to the output bumps and overlapping the output bump area. The control signal line electrically connected through the transistors to the output bumps.