Display Driving Circuit Crack Detection Using Sensing Lines
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Solution Overview
Problem
Semiconductor integrated circuits, such as those in display driving circuits, are prone to cracking due to external forces during manufacturing or assembly, leading to defects that are not detectable until after assembly, causing issues in module performance.
Innovation Solution
Incorporating a crack detector circuit and crack sensing lines in the display driving circuit to detect cracks by transmitting test signals and comparing reception signals, allowing for the output of test result signals indicating the presence or absence of cracks, enabling early detection and prevention of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crack detection circuits and sensing lines are added to the display driving circuit, then crack detection capability is improved, but device complexity increases
Solution Approach 1:
The crack detector circuit is integrated within the display driving circuit substrate, merging the detection function with the existing driving circuit rather than using a separate detection device. This reduces overall system complexity while maintaining detection capability.
Solution Approach 2:
The crack sensing lines utilize the existing data line structure of the display panel, making the data lines serve dual purposes: both driving the display and detecting cracks. This multi-functionality approach avoids adding separate detection infrastructure.
2Reliability
If crack sensing lines are placed in the boundary area, then crack detection coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The crack sensing lines are formed during the initial manufacturing process of the display panel, before final assembly. This preliminary integration ensures detection coverage is built-in from the start, avoiding complex post-manufacturing modifications.
Solution Approach 2:
The sensing lines use the existing data line conductive patterns and material properties, changing their functional parameter from purely signal transmission to include electrical sensing capability. This leverages existing manufacturing parameters rather than introducing new materials or processes.
Data Source
AI summary
A display driving circuit includes a central area and a boundary area surrounding the central area. The display driving circuit includes a first crack detector circuit in the central area; and a first crack sensing line in the boundary area, wherein the first crack detector circuit is configured to detect a crack in the first crack sensing line in response to a first test command, and output a test result signal including information about a presence or an absence of a crack in the first crack sensing line.