Row Driving Circuit Ghost Reduction Potential Adjustment
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Solution Overview
Problem
LED display panels in the prior art are prone to 'caterpillar' phenomena, where damaged LED components cause short-circuiting or open-circuiting, affecting neighboring LEDs and leading to erroneous dim light, thereby degrading the visual effect and user experience.
Innovation Solution
A method for adjusting the ghost reduction potential is introduced, utilizing a row driving circuit with a ghost reduction potential generation circuit that includes a multiplexer. This circuit generates and selects between multiple voltages based on open-circuit and short-circuit detection signals to control the ghost reduction potential, thereby preventing the caterpillar phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single ghost reduction potential is used in LED display panels, then the circuit structure is simple, but it cannot simultaneously eliminate both short-circuit caterpillar phenomenon and open-circuit caterpillar phenomenon
Solution Approach 1:
The ghost reduction potential generation circuit is segmented into multiple independent voltage generation paths (first ghost reduction potential and second ghost reduction potential), each optimized for different failure modes. The multiplexer selects between these segmented potentials based on detection signals, allowing targeted elimination of caterpillar phenomena without requiring a completely complex redesign of the entire circuit.
Solution Approach 2:
The circuit performs preliminary detection of LED component status through detection signals before selecting the appropriate ghost reduction potential. By detecting open-circuit or short-circuit conditions in advance and pre-preparing multiple potential options, the system can quickly switch to the correct potential configuration without trial-and-error adjustments, thereby eliminating caterpillar phenomena efficiently.
2Reliability
If the ghost reduction potential is adjusted dynamically based on detection signals, then both short-circuit and open-circuit caterpillar phenomena can be eliminated, but the control circuit complexity increases
Solution Approach 1:
The multiplexer serves as a universal control component that handles multiple functions: selecting between different ghost reduction potentials, responding to various detection signals (open-circuit detection and short-circuit detection), and adapting to different failure modes. This multi-functional approach consolidates control logic into a single component, reducing overall control circuit complexity while maintaining the ability to eliminate both types of caterpillar phenomena.
Solution Approach 2:
The multiplexer acts as an intermediary between the detection circuit and the ghost reduction potential generation circuit. It receives detection signals, processes them through its selection logic, and outputs the appropriate ghost reduction potential to the display circuit. This intermediary role isolates the complexity of dynamic potential selection from both the detection and execution circuits, simplifying the overall control architecture.
Data Source
AI summary
Disclosed is a method for adjusting a ghost reduction potential, a row driving circuit and an LED display device. The method is realized by a row driver module, and comprises: receiving, by a row driver chip, an open-circuit detection signal and a short-circuit detection signal from a row driving side of an LED display panel; according to the open-circuit detection signal and the short-circuit detection signal, by the row driver chip, generating a control signal and transmitting the control signal to a multiplexer, thereby controlling the multiplexer to select only the first/second voltage as the ghost reduction potential, select the first voltage and the second voltage as the ghost reduction potential in sequence, or select the second voltage and the first voltage as the ghost reduction potential in sequence, which efficiently solves constant bright problems caused by an open-circuited/short circuited LED lamp bead, i.e., solving open-circuit/short-circuit caterpillar phenomenon.