Touch Display Gate Driver Testing via DC Signal Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch display screen testing methods fail to detect unqualified products effectively during the manufacturing process, leading to the use of defective screens in subsequent stages and wastage of raw materials due to the appearance of 'Touch lines' that interfere with defect detection.
Innovation Solution
Applying direct current signals to the gate driving circuit of the touch display screen to turn on all gate electrodes simultaneously in one testing stage, and alternate current signals in another stage, allowing for the detection of display defects and Gate Driver on Array (GOA) defects, while controlling the screen to display images of different colors to enhance defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time sequence alternate current signals are applied to the gate driving circuit, then GOA defects can be detected, but 'Touch lines' appear that interfere with display defect detection
Solution Approach 1:
The testing process is divided into two distinct testing stages: a first testing stage using direct current signals to detect display defects without Touch lines, and a second testing stage using time sequence alternate current signals to detect GOA defects. This segmentation allows each testing objective to be achieved independently without mutual interference.
Solution Approach 2:
The patent implements periodic switching between different testing modes: alternating between direct current signal application (for display defect detection) and time sequence alternate current signal application (for GOA defect detection). This periodic action ensures both types of defects are detected systematically while avoiding the interference problem.
2Productivity
If conventional testing methods are used, then the testing process can be completed, but unqualified products are not effectively detected leading to raw material wastage
Solution Approach 1:
The patent performs preliminary defect detection during the Cell process stage by applying direct current signals to turn on all gate electrodes simultaneously, making display defects visible before proceeding to subsequent Module process stages. This preliminary action prevents unqualified products from advancing further, thereby reducing raw material wastage.
Solution Approach 2:
The patent introduces a specialized testing device as an intermediary system that bridges the gap between conventional testing and improved defect detection. This device applies specific direct current signals to gate driving circuits and controls liquid crystal display units to display test patterns, enabling reliable detection of both display defects and GOA defects without interfering with normal production flow.
Data Source
AI summary
A touch display screen testing method and a touch display screen testing device are provided. The method includes: applying a direct current signal to a gate driving circuit of the touch display screen to turn on gate electrodes of the touch display screen simultaneously, to detect a display defect of the touch display screen, in a first testing stage of an electric performance testing process at a Cell stage of a touch display screen.