Display Panel Cable Connection Defect Detection via Current Comparison
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Solution Overview
Problem
Existing display apparatuses, particularly self-luminous displays, face challenges in detecting connection defects between the display panel and connected cables, as conventional defect testing methods are inadequate for identifying such issues.
Innovation Solution
A display apparatus and control method that utilize a main controller to transmit pattern image signals to symmetrical regions of the display panel, measuring current values from these regions to determine the connection state of the cable, allowing for the detection of connection defects by comparing first and second current values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional defect testing methods (displaying white/red/green/blue images) are used, then screen defects can be detected, but connection defects of cables cannot be detected
Solution Approach 1:
The patent changes the detection parameter from visual inspection of displayed images to electrical measurement of current values. By measuring current consumption differences when identical pattern images are displayed in different regions, the system can detect cable connection defects that are invisible through conventional visual testing methods.
Solution Approach 2:
The patent replaces the mechanical/visual inspection system with an electrical measurement system. Instead of relying on human visual detection of displayed patterns, the system uses current sensors to measure electrical parameters, enabling automatic and more comprehensive defect detection including cable connections.
2Reliability
If pattern images are displayed in different regions sequentially, then cable connection defects can be detected through current comparison, but additional time is required for the test
Solution Approach 1:
The patent segments the display panel into different regions (first region and second region) and tests each region separately by displaying pattern images sequentially. This segmentation allows the system to isolate and detect connection defects in specific cable connections by comparing current values from different regions, improving detection accuracy despite the increased test time.
3Measurement precision
If symmetrical regions are used for pattern image display, then cable connection defects can be detected through current value comparison, but the test complexity increases
Solution Approach 1:
The patent uses symmetrical regions (first region and second region that are symmetrical to each other) for testing, which actually reduces complexity by providing a controlled comparison. The symmetry ensures that both regions should consume identical current under normal conditions, making it easier to identify connection defects through simple current value comparison without complex analysis algorithms.
Data Source
AI summary
A display apparatus includes: a display panel including a first region and a second region; a controller to process source data and to generate an image signal; a timing controller to generate a driving signal for driving the display panel based on the image signal; and a cable connected to the display panel and to transmit the driving signal to the display panel. The controller transmits, to the timing controller, a pattern image signal for displaying a pattern image on the first and the second regions in a sequential manner; and determines a connection state of the cable based on (i) a first current value, which is output based on the pattern image displayed in the first region and (ii) a second current value, which is output based on the pattern image displayed in the second region.