Open Circuit Detection in LED Display Devices
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Solution Overview
Problem
Existing LED display devices fail to accurately detect open circuits due to the presence of short-circuited lamp beads, leading to incorrect detection of open circuit states.
Innovation Solution
An open circuit detection method that involves supplying an open-circuit detection voltage to a row line and pulling down the electric potentials of other row lines to a preset value lower than the ON-voltage of LED lamp beads, allowing for accurate identification of open circuits by detecting column lines with electric potentials lower than a second preset value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electric potentials of all row lines are supplied with open-circuit detection voltage, then the detection coverage is improved, but the power consumption increases and short-circuited lamp beads cause false detection
Solution Approach 1:
The patent divides the row lines into two groups: a first row line being detected and other row lines. Different voltage treatments are applied to each group, reducing overall power consumption while maintaining detection accuracy for the target row.
Solution Approach 2:
The patent applies different electric potential treatments to different row lines based on their detection status. The first row line receives open-circuit detection voltage while other row lines receive pull-down voltage, creating localized optimal conditions for detection without affecting the entire system.
2Measurement precision
If the electric potentials of other row lines are pulled down to zero, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent changes the pull-down voltage parameter from zero to a first preset value that is greater than zero. This parameter adjustment maintains the ability to distinguish open-circuit states while reducing the power consumption associated with pulling down row line potentials.
3Adaptability or versatility
If short-circuited lamp beads are present, then the device complexity increases, but the open circuit detection fails
Solution Approach 1:
The patent performs preliminary detection of short-circuited lamp beads before open-circuit detection. By identifying and handling short-circuited lamp beads in advance, the system prevents them from interfering with the subsequent open-circuit detection process.
Solution Approach 2:
The patent executes preliminary actions to detect and record the positions of short-circuited lamp beads before performing the main open-circuit detection. This preliminary action allows the system to adjust its detection strategy accordingly.
Data Source
AI summary
An open circuit detection method and an LED display device are provided, relating to the technical field of LED display, wherein the open circuit detection method includes: supplying an open-circuit detection voltage to any row line to be detected among a plurality of row lines in the LED display device, and pulling down electric potentials of row lines other than the row line to be detected among the plurality of row lines to a first preset value, wherein the first preset value is smaller than an ON-voltage of each of the LED lamp beads and greater than 0; detecting whether the respective column lines include a column line having an electric potential lower than a second preset value, wherein if yes, it is determined that the LED display device has an LED lamp bead in an open circuit state.