Display Panel Lighting Test Line Antenna Ratio Reduction
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Solution Overview
Problem
Existing display panel lighting tests struggle to detect cracks on the substrate, as they primarily focus on pixel-level light emission and resistance changes, making it difficult to identify substrate cracks effectively.
Innovation Solution
A display panel design with a lighting test line alternately disposed in two layers, where N test lines in the first layer are connected by N-1 bridges in the second layer, reducing the antenna ratio and minimizing damage from electrical discharges during plasma etching, allowing for efficient crack detection in the non-display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test line is arranged along an edge of the display panel to perform lighting test for detecting crack on substrate, then crack detection capability is improved, but antenna ratio increases causing damage during plasma etching
Solution Approach 1:
The test line is segmented into multiple sections arranged in different layers (first layer and second layer). Specifically, the test line includes N test lines in the first layer and N-1 bridges in the second layer, where each bridge electrically connects adjacent test lines. This segmentation reduces the antenna ratio of the test line while maintaining its crack detection functionality.
Solution Approach 2:
The test line structure transitions from a single-layer planar arrangement to a multi-layer three-dimensional configuration. By disposing test lines and bridges alternately in the first layer and second layer, the patent reduces the antenna ratio while preserving the electrical connectivity and crack detection capability along the panel edge.
Data Source
AI summary
A display panel includes a display region including a data line and a pixel that is electrically connected to the data line, a non-display region including a lighting test line that is arranged alternately in a first layer and in a second layer disposed on the first layer, the non-display region being adjacent to the display region and including, and a lighting test unit providing a lighting test voltage to the display region through the lighting test line.