Display Panel Detection Circuit for Early Source Signal Defect Identification
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Solution Overview
Problem
Existing display panel testing methods fail to detect abnormalities in the source signal lines and fan-out areas before the control chip is bonded, leading to waste of materials and productivity due to defective products being identified only during final module inspection.
Innovation Solution
A display panel design with a detection circuit in the peripheral region, including lighting data lines and source signal line leads, which transmits a lighting signal to detect abnormalities in the source signal lines and multi-splitter circuit, allowing for early identification of defects and improved yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If electronic detection is performed before control chip bonding, then early defect identification is possible, but circuit abnormalities in source signal lines cannot be detected
Solution Approach 1:
The patent segments the detection function by introducing a dedicated detection circuit separate from the main display circuit. This detection circuit includes detection signal lines that are independently connected to bonding pads, allowing separate testing of source signal lines before final assembly. The segmentation enables early detection without interfering with normal display operations.
Solution Approach 2:
The patent introduces an intermediary detection circuit that acts as a mediator between the source signal lines and the testing equipment. This detection circuit contains detection signal lines that connect to the same source signal lines as the display, allowing indirect testing of the source signal line integrity without requiring the control chip to be bonded yet.
2Reliability
If final detection is performed after module process, then complete product testing is achieved, but material and productivity waste occurs
Solution Approach 1:
The patent implements preliminary detection actions by incorporating detection circuits and detection signal lines into the display panel structure before the module process. This allows testing to be performed at an earlier stage, identifying defective source signal lines before materials are invested in control chip bonding and module assembly, thereby preventing waste of time and materials.
Solution Approach 2:
The detection circuit provides feedback about the integrity of source signal lines through dedicated detection signal lines connected to bonding pads. This feedback mechanism allows real-time monitoring of source signal line status during manufacturing, enabling immediate identification of defects and preventing progression of defective products to later manufacturing stages.
3Measurement precision
If detection circuit is added to peripheral region, then source signal line detection is enabled, but device complexity increases
Solution Approach 1:
The patent merges the detection circuit with the existing peripheral region structure of the display panel. The detection signal lines are integrated into the same peripheral region where other circuit elements are located, and the detection circuit shares the same substrate and manufacturing processes as the display circuit, thereby minimizing additional complexity.
Solution Approach 2:
The detection circuit is designed with multi-functionality, serving both as a detection mechanism and as part of the overall panel structure. The detection signal lines are routed through the peripheral region alongside other signal lines, and the detection circuit can potentially serve multiple testing purposes, reducing the need for separate dedicated testing components.
Data Source
AI summary
A display panel, a method for detecting a display panel and an electronic device are provided. a display panel are provided, including a display area and a peripheral region surrounding the display area; a plurality of bonding pads in the peripheral region; a lighting pad in the peripheral region; a plurality of source signal lines at least in the display region; a plurality of source signal line leads in the peripheral region and electrically connected to the plurality of source signal lines and electrically connected to the plurality of bonding pads; a plurality of sub-pixel columns in the display region and electrically connected to the plurality of source signal lines; and a detection circuit, arranged in the peripheral region and between the plurality of binding pads and the display area.