OLED Display Driving Method Using Compensation Sub-frames
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face challenges in maintaining consistent luminance across pixels due to variations in electrical characteristics and manufacturing processes, as well as IR drop-induced deviations in high potential power voltage, leading to difficulties in displaying desired images.
Innovation Solution
An OLED display system that includes a timing controller dividing each frame into driving and compensation sub-frames, adjusting compensation gray levels and duties based on a luminance map to correct luminance deviations, and reducing power voltage levels to minimize IR drop effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If OLED displays are manufactured with standard processes, then production efficiency is maintained, but luminance consistency across pixels deteriorates due to variations in electrical characteristics
Solution Approach 1:
The patent applies preliminary action by measuring and storing luminance characteristics of each pixel before normal display operation. A compensation sub-frame is prepared in advance containing correction data for each pixel's luminance deviations, which is then applied during normal operation to correct luminance inconsistencies without requiring complex real-time adjustments.
Solution Approach 2:
The patent changes the parameter approach by introducing compensation gray levels and compensation duties as adjustable parameters. Instead of modifying the physical OLED characteristics, the system adjusts electrical parameters (gray levels and duty cycles) dynamically to compensate for manufacturing variations, thereby improving luminance consistency through parameter optimization rather than physical modification.
2Power
If high potential power voltage is applied to pixel lines, then driving capability is improved, but IR drop effects worsen causing luminance deviation across pixel lines
Solution Approach 1:
The patent applies local quality by providing different compensation values to different pixel lines based on their specific IR drop characteristics. Pixels farther from the power source receive different compensation gray levels or duties compared to pixels closer to the power source, creating a localized compensation strategy that addresses the spatial variation in voltage drop without reducing overall driving capability.
Solution Approach 2:
The patent implements feedback by measuring the actual luminance output of each pixel and using this information to calculate appropriate compensation values. The compensation sub-frame is generated based on feedback from luminance measurements, creating a closed-loop system that continuously corrects for IR drop effects while maintaining optimal driving conditions.
3Manufacturing precision
If compensation sub-frame is added to correct luminance deviations, then display image quality is improved, but frame processing time increases
Solution Approach 1:
The patent merges the compensation function with the normal display operation by integrating the compensation sub-frame into the existing frame structure. The compensation data is combined with the image data in a unified processing pipeline, allowing simultaneous handling of both correction and display functions without requiring separate processing passes, thereby minimizing additional time overhead.
Solution Approach 2:
The patent applies partial action by selectively applying compensation only to pixels that exhibit luminance deviations, rather than uniformly processing all pixels. The compensation sub-frame contains correction data only where needed, allowing the system to improve display quality for affected pixels while minimizing processing overhead for pixels that already meet luminance specifications.
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 approach ensures improved display image quality by compensating for luminance variations across pixels and pixel lines, reducing power consumption, and increasing gray level representation performance.
Implementation Method 1
When a driving voltage is applied to the anode electrode and the cathode electrode, holes passing through the hole transport layer HTL and electrons passing through the electron transport layer ETL move to the emission layer EML and form excitons. As a result, the emission layer EML generates visible light.
Data Source
AI summary
Disclosed is an organic light emitting diode (OLED) display that includes a display panel including a plurality of gate lines and a plurality of data lines crossing each other to define a plurality of pixels, each pixel including a driving transistor, a switching transistor, an OLED and a storage capacitor; a timing controller that receives pixel data of an input image and timing signals and time-divides a period of one frame into at least a driving sub-frame and a compensation sub-frame based on one or more of the timing signals; and a display panel driver that converts the pixel data into data voltages and supplies the data voltages to the plurality of data lines during the driving sub-frame, and that adjusts compensation gray levels of the plurality of pixels or compensation duties of the plurality of pixels based on a luminance map, which contains information on a luminance deviation for each pixel with respect to a same gray level, during the compensation sub-frame.