LED Display Driver Equalizing Data Lines to Prevent Voltage Overcharging
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Solution Overview
Problem
In organic light-emitting diode (OLED) panels, voltage overcharging in the gate voltage of sub-pixel transistors leads to abnormal displays due to the diode property of the transistors, causing the storage capacitor voltage to not follow the target level, especially during data scanning periods.
Innovation Solution
A driver device with an equalization control circuit, source driver circuit, and output switching circuit that checks sub-pixel data conditions and selectively performs an equalization operation on data lines to prevent overcharging by ensuring the voltage swing is reduced and maintaining the storage capacitor voltage at the target level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the output switching circuit performs equalization operation on data lines, then voltage swing is reduced and display quality is improved, but sub-pixel transistors experience voltage overcharging due to diode property
Solution Approach 1:
The equalization control circuit checks sub-pixel data conditions before the equalization operation is executed. By evaluating whether the first and second sub-pixel data meet predetermined conditions in advance, the system determines whether to enable the equalization operation, thereby preventing voltage overcharging before it occurs.
Solution Approach 2:
The equalization control circuit continuously monitors sub-pixel data conditions and provides feedback control for the equalization operation. Based on the checking result, the circuit dynamically adjusts whether to perform equalization, creating a closed-loop control system that prevents overcharging while maintaining display quality.
2Stability of the object's composition
If equalization operation is performed continuously, then voltage stability is improved, but power consumption increases due to frequent charging and discharging operations
Solution Approach 1:
Instead of continuous equalization operation, the system performs equalization periodically based on predetermined conditions. The equalization control circuit checks conditions and enables equalization only when necessary, converting continuous operation into conditional periodic operation to reduce power consumption while maintaining voltage stability.
Solution Approach 2:
The system applies equalization operation partially rather than universally. By checking whether sub-pixel data meets predetermined conditions, the system enables equalization only for specific cases where it is needed, avoiding unnecessary charging and discharging operations that consume power.
Data Source
AI summary
A driving device and an operation method thereof are provided. The driver device includes a source driver circuit, an output switching circuit, and an equalization control circuit. Two input ends of the output switching circuit are coupled to two output ends of the source driver circuit. Two output ends of the output switching circuit are coupled to two data lines of an LED display panel. The equalization control circuit checks whether sub-pixel data of the two data lines meets a predetermined condition. A plurality of sub-pixels located on a current display line of the LED display panel are reset in a reset period. In a data scanning period after the reset period, the equalization control circuit determines whether to control the output switching circuit to perform an equalization operation on the two data lines according to the checking result.