LED Display Driving Circuit for Shorted-LED Brightness Compensation
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Solution Overview
Problem
LED display devices face issues with line failures due to shorted LEDs, causing brightness inconsistencies across connected LEDs, which are costly and time-consuming to repair.
Innovation Solution
An LED display driving circuit with a channel driving circuit, scan driving circuit, precharge switches, and data controller that detects shorted LEDs, maintains a floating state of affected scan lines, and compensates brightness of connected LEDs using pulse width modulation and precharge control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shorted LED is detected and repaired or replaced, then picture quality failure is resolved, but repair cost and time increase
Solution Approach 1:
The system performs automatic detection and compensation of shorted LEDs through the controller, which identifies shorted LEDs by monitoring current consumption patterns and compensates by adjusting driving currents of adjacent LEDs, eliminating the need for manual repair intervention
Solution Approach 2:
The system continuously monitors the current consumption of each LED through sensing circuits and uses this feedback information to identify shorted LEDs and adjust driving parameters in real-time, enabling dynamic compensation without physical intervention
2Reliability
If a shorted LED is detected and repaired or replaced, then picture quality failure is resolved, but repair cost increases
Solution Approach 1:
The system performs automatic detection and compensation of shorted LEDs through the controller, which identifies shorted LEDs by monitoring current consumption patterns and compensates by adjusting driving currents of adjacent LEDs, eliminating the need for manual repair intervention
Solution Approach 2:
The system uses software-based compensation algorithms and control circuitry adjustments rather than physical LED replacement, treating the shorted LED as a detectable anomaly that can be compensated for through electronic control rather than requiring expensive hardware replacement
3Stability of the object's composition
If precharge switches are turned on when scan switches are turned off, then scan lines are properly charged, but shorted LEDs cause brightness inconsistencies
Solution Approach 1:
The system applies different driving currents to different LEDs based on their individual characteristics, specifically reducing current to shorted LEDs and adjusting current to adjacent LEDs to compensate for their reduced brightness, thereby achieving local optimization of brightness uniformity
Solution Approach 2:
The system changes the driving current parameter dynamically based on LED status, adjusting the current magnitude for LEDs connected to scan lines with shorted LEDs versus normal scan lines, and modifying precharge voltages to compensate for brightness inconsistencies
Data Source
AI summary
A LED display driving circuit includes a channel driving circuit configured to supply a channel current to a plurality of channel lines according to a pulse width modulation (PWM) control signal, a scan driving circuit including a plurality of scan switches connected to a plurality of scan lines and selectively turned on or off according to a scan signal to select a scan line connected to LEDs to emit light, and a plurality of precharge switches connected to the plurality of scan lines and operate complementarily with the scan switches, and a data controller configured to generate the PWM control signal, the scan signal, and the precharge control signal and maintain a target scan line in a floating state by turning off a precharge switch connected to a target scan line when a scan switch of a target scan line to which a shorted LED is connected is turned off when the shorted LED among the plurality of LEDs is detected.