GOA Circuit Grouping for Invalid Detection
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Solution Overview
Problem
Existing display panel technologies face challenges in accurately detecting invalid Gate-driver-on-array (GOA) circuit units, making it difficult to determine which stage is faulty and hindering effective repair, leading to increased manufacturing costs and reduced yield rates.
Innovation Solution
The display panel is designed with cascading GOA circuit units divided into groups, each connected to a test line that compares output signals to detect invalid units, and virtual GOA circuit regions that replace invalid units, allowing for precise identification and repair of faulty stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only the output signal of the last stage GOA circuit is detected, then the detection structure is simple, but the accuracy of identifying which GOA circuit unit is invalid is low
Solution Approach 1:
The patent divides the GOA circuit units into multiple groups, where each group is independently detectable through separate test lines. This segmentation allows the system to identify which specific group contains the invalid GOA circuit unit, thereby improving detection accuracy without requiring complex individual circuit testing for each unit.
2Ease of repair
If GOA circuit units are not divided into groups, then the circuit structure is simpler, but the ability to locate and repair specific invalid stages is reduced
Solution Approach 1:
By segmenting the GOA circuit units into multiple detectable groups with dedicated test lines, the patent enables precise localization of invalid units. This segmentation strategy facilitates targeted repair efforts by identifying which specific group and stage contains the defect, making repair more efficient despite the increased structural organization.
Solution Approach 2:
The patent introduces virtual GOA circuit regions that serve as backup copies. When a GOA circuit unit is determined to be invalid through the grouping and testing process, the system can switch to using the virtual copy, enabling rapid repair or replacement without physical intervention, thus improving ease of repair.
3Productivity
If no virtual GOA circuit regions are provided, then the device structure is simpler, but the yield rate is reduced due to inability to replace invalid units
Solution Approach 1:
The patent creates virtual GOA circuit regions as functional copies of the physical GOA circuit units. These virtual regions serve as backup sources that can replace invalid physical units, thereby maintaining display panel functionality and improving yield rates. The virtual copies are integrated into the system architecture, allowing seamless substitution when defects are detected through the group-based testing methodology.
Data Source
AI summary
A display panel with GOA circuit invalid detection is provided. A plurality of cascading gate-driver-on-array (GOA) circuit units are disposed in the display panel. The GOA circuit units are divided into a plurality of groups of GOA circuit units. The last stage of the GOA circuit units in each group of GOA circuit units is connected to a test line. One group of GOA circuit units is treated as a unit to detect whether any GOA circuit unit in each group is invalid. This improves accuracy in GOA circuit invalid detection.