OLED Driving Circuit Error Capture via Voltage Sensing
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Solution Overview
Problem
Existing display panel driving circuits face inaccuracies in electrical compensation due to current errors, leading to uneven panel brightness in OLED displays, as they cannot accurately obtain the current-voltage relation of OLEDs caused by source driving circuit errors.
Innovation Solution
A method and circuit for capturing error information, where a timing controller circuit drives the LED display panel to sense errors in both the LED and driving current, allowing for the compensation of pixel data to correct for these errors, thereby obtaining accurate LED and driving circuit error information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If electrical compensation is performed using current detection in source driving circuit, then panel brightness uniformity can be improved, but measurement precision deteriorates due to current errors in transistor manufacturing
Solution Approach 1:
The patent introduces an intermediary measurement approach by detecting voltage instead of directly measuring current. The source driving circuit detects the voltage across the OLED while a known reference current is supplied, thereby avoiding direct current measurement errors. This voltage detection serves as an intermediary that indirectly provides accurate current-voltage relationship information without being affected by transistor manufacturing current errors.
Solution Approach 2:
The patent substitutes current detection (electrical measurement prone to error) with voltage detection (electrical measurement more accurate). By replacing the measurement method from direct current sensing to voltage sensing with known current reference, the system eliminates the impact of transistor current errors while maintaining the electrical compensation capability for OLED decay.
2Reliability
If current is supplied to OLED for voltage detection, then electrical compensation can be performed, but current errors from source driving circuit prevent accurate compensation
Solution Approach 1:
The patent uses voltage detection as an intermediary measurement that bypasses the problematic current sensing path. By supplying a known reference current through the source driving circuit and measuring the resulting voltage across the OLED, the system obtains accurate current-voltage relationship data without the measurement being corrupted by transistor manufacturing current errors in the source driving circuit.
Solution Approach 2:
The patent implements a feedback mechanism where the detected voltage information is fed back to the timing controller, which then adjusts the pixel data to compensate for OLED decay. The feedback loop uses the accurately measured voltage (rather than erroneous current measurements) to generate corrected compensation values, ensuring reliable and accurate compensation while eliminating the impact of source driving circuit current errors.
Data Source
AI summary
The invention provides a display panel driving circuit and a method for capturing error information thereof. The display panel driving circuit includes a driving circuit, a pixel circuit and a timing controller circuit. The method includes: obtaining LED error information indicating errors caused by an LED of the pixel circuit; driving the LED by the drive circuit to obtain LED and driving circuit error information; obtaining driving circuit error information according to the two error information. The timing controller circuit records the error information and compensates LED attenuation by using the error information.