LED Display Open Fault Isolation via Pin Voltage Detection
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Solution Overview
Problem
In display apparatuses using LED devices, when an LED device malfunctions and becomes 'open,' it can cause adjacent LED devices connected to the same cathode to malfunction due to current backflow, leading to interference and malfunctioning of peripheral LEDs.
Innovation Solution
A method and apparatus that determine the coordinate of an open LED device by measuring pin voltage and process an image to output a particular color, such as black, in the area where the open LED is located, thereby preventing or reducing the malfunction of adjacent LEDs by isolating the faulty device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED devices are connected to the same cathode to enable display operation, then display functionality is achieved, but when one LED opens, current backflow causes adjacent LEDs to malfunction
Solution Approach 1:
The patent extracts the faulty open LED from the display by determining its coordinate and replacing its output with a black image area. This removes the harmful influence of the open LED from the overall display function, preventing current backflow from affecting adjacent LEDs while maintaining display operation in other areas.
Solution Approach 2:
The patent applies local quality by processing the image signal specifically at the coordinate location of the open LED. Instead of affecting the entire display, only the local area corresponding to the open LED is modified to output black, while other areas maintain their normal display function.
2Reliability
If software processing is applied to determine open LED coordinate and process image, then peripheral LED malfunction is prevented, but device complexity increases
Solution Approach 1:
The driver circuit performs self-diagnosis by measuring the voltage at the test point to detect open LEDs. The system uses its own operational parameters (voltage measurements during normal operation) to identify faults and automatically adjust output, eliminating the need for external detection equipment or complex additional hardware.
Solution Approach 2:
The patent replaces physical/hardware complexity with software processing complexity. Instead of adding complex hardware circuits to prevent current backflow, the system uses software algorithms to detect open LEDs and process image signals to compensate for their presence, achieving reliability through computational methods rather than hardware modifications.
3Reliability
If image processing is applied to output particular color in open LED area, then display quality is maintained, but processing time increases
Solution Approach 1:
The system determines the coordinate of the open LED during the display operation, and the image processing is performed in advance or concurrently with the display refresh cycle. By preparing the black image area at the appropriate time and location, the system avoids additional processing delays that would affect the final display output time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents or reduces the malfunction of peripheral LED devices by identifying and isolating the open LED device, ensuring proper functioning of the display apparatus.
Implementation Method 1
determining whether any of the plurality of LED devices are open using a pin voltage connected to the plurality of LED devices
Data Source
AI summary
A display apparatus and a controlling method thereof are provided. The method of controlling the display apparatus including a plurality of LED devices, includes determining whether a plurality of LED devices are open using, for example, a pin voltage connected to the plurality of LED devices, in response to an open LED device being present, determining a coordinate of the open LED device, processing an image so that a particular color is output in an area where the open LED device is located, and outputting the processed image.