Timing Controller Humidity-Based Compensation for OLED Uniformity
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Solution Overview
Problem
Organic light emitting display devices face issues with luminance non-uniformity due to changes in feature values of circuit elements over time, leading to display abnormalities and potential overcurrent or burnt panel phenomena, especially under high humidity conditions where precise sensing is compromised.
Innovation Solution
Incorporating a humidity sensor and a controller that compares sensed humidity with a critical threshold to determine whether to use sensing data or reference data for compensation, thereby preventing improper compensation and avoiding display abnormalities, overcurrent, and burnt panel phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If compensation is performed using sensing data under high humidity conditions, then luminance uniformity is improved, but measurement precision deteriorates due to false sensing
Solution Approach 1:
The patent applies preliminary action by performing compensation using previously stored reference data before false sensing data can be generated under high humidity conditions. The timing controller determines that sensing data is unreliable when humidity exceeds a threshold and switches to using reference data from normal conditions, preventing compensation errors before they occur.
Solution Approach 2:
The patent introduces humidity as an intermediary parameter to mediate between sensing data quality and compensation accuracy. By monitoring humidity levels, the system determines whether sensing data is reliable and selects appropriate compensation strategies, using humidity as a mediator to prevent false compensation.
2Measurement precision
If sensing is performed continuously to monitor feature value variations, then compensation accuracy is improved, but reliability deteriorates due to short circuit risks under high humidity
Solution Approach 1:
The patent applies preliminary action by performing compensation using reference data before high humidity conditions cause short circuits. By proactively switching to reference data when humidity exceeds thresholds, the system avoids attempting to sense feature values under unreliable conditions, preventing both false compensation and potential damage.
Solution Approach 2:
The patent converts the harmful effect of high humidity into a beneficial control mechanism. By using humidity monitoring to trigger switching between sensing modes, the system transforms a potentially damaging condition into a useful indicator for selecting appropriate compensation strategies, preventing false sensing while maintaining reliability.
3Stability of the object's composition
If feature value sensing is performed to compensate for circuit element variations, then luminance uniformity is improved, but harmful factors increase due to overcurrent and burnt panel risks
Solution Approach 1:
The patent applies preliminary action by performing compensation using reference data before high humidity conditions can cause short circuits and overcurrent. By proactively switching to reference data when humidity exceeds thresholds, the system prevents attempting to sense and compensate under conditions that could lead to damaging current spikes.
Solution Approach 2:
The patent converts the harmful effect of high humidity into a protective mechanism. By using humidity monitoring to trigger switching between compensation modes, the system transforms a potentially damaging condition into a useful indicator for preventing overcurrent and burnt panel risks.
Data Source
AI summary
An organic light emitting display device includes a display panel including a plurality of sub-pixels, each sub-pixel having an organic light emitting diode and a driving transistor to drive the organic light emitting diode; a sensing circuit configured to output sensing data for feature values of the organic light emitting diode or the driving transistor of each sub-pixel; a humidity sensor configured to sense humidity at an edge of the display panel; and a controller configured to compare sense humidity sensed by the humidity sensor with a predetermined critical humidity, and control compensation for variance of the feature values using the sensing data or previously stored reference data, depending on a comparison result.