OLED Data Driver Offset Voltage Correction for Brightness Uniformity
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Solution Overview
Problem
Organic light emitting displays produced with varying manufacturing processes result in inconsistent brightness levels, leading to displays with poor visibility as they may appear too dark or washed out if outside a normal brightness range.
Innovation Solution
An organic light emitting display system that includes a pixel unit, a data driver with a memory to store and control a corrected offset voltage, and a scan driver, which measures brightness and adjusts the data signal voltage to maintain displays within a normal brightness range by calculating and applying a corrected offset voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different manufacturing processes are used to produce organic light emitting displays, then productivity is improved, but brightness consistency deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the offset voltage parameter in the data driver to compensate for brightness variations caused by different manufacturing processes. By changing this electrical parameter, the system can correct brightness deviations without modifying the manufacturing process itself, thus maintaining productivity while improving brightness consistency.
Solution Approach 2:
The patent implements a feedback mechanism where the actual brightness of each display is measured and used to determine the appropriate offset voltage correction. This closed-loop feedback allows the system to automatically adjust for manufacturing variations, ensuring consistent brightness output across displays produced through different manufacturing processes.
2Device complexity
If offset voltage is not corrected, then device complexity is reduced, but brightness uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the corrected offset voltage values in a lookup table within the data driver before operation. This allows the system to quickly apply brightness corrections without complex real-time calculations, maintaining relative simplicity while achieving uniform brightness across displays with varying characteristics.
3Manufacturing precision
If brightness correction is applied, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary element - the offset voltage correction mechanism with lookup table - that mediates between the data driver and the OLED. This intermediary handles the complexity of brightness correction separately, allowing the main display structure to remain simple while still achieving uniform brightness through the corrective offset voltage application.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the proportion of defective displays by ensuring consistent brightness levels, improving image visibility and productivity by adjusting the offset voltage to maintain displays within a standard brightness range.
Implementation Method 1
The organic emission layer is disposed between the anode electrode and the cathode electrode and emits light by a combination of electrons and holes
Data Source
AI summary
An organic light emitting display including: a pixel unit to display an image, according to a data signal and a scan signal; a data driver to supply the data signal, according to a video signal; and a scan driver to supply the scan signal. The data driver includes a memory to store a corrected offset voltage and to control a voltage of the data signal according to the corrected offset voltage.