OLED Display Emission Time Control for Deterioration Reduction
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Solution Overview
Problem
Organic light emitting diode (OLED) displays suffer from degradation over time, leading to varying brightness levels across pixels, which degrades overall display quality due to the deterioration of diodes.
Innovation Solution
An OLED display system that divides pixels into blocks, accumulates brightness data, and generates emission control signals to adjust emission times based on brightness history, reducing the deterioration of OLEDs by incrementally reducing brightness when threshold values are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLEDs are driven continuously at high brightness, then display quality and user experience are improved, but OLED deterioration accelerates and lifespan is reduced
Solution Approach 1:
The patent implements dynamic emission time control where the emission time of each pixel is adjusted based on its brightness history data. The emission time controller dynamically modifies emission parameters (emission width signal) to reduce emission time for pixels that have accumulated high brightness exposure, thereby preventing deterioration while maintaining display quality when needed.
Solution Approach 2:
The system accumulates brightness history data for each pixel and uses this feedback to control future emission behavior. The emission time controller receives brightness history data and adjusts emission times accordingly, creating a closed-loop feedback mechanism that prevents OLED deterioration by reducing emission time for pixels that have been overused.
2Reliability
If emission time is reduced to prevent OLED deterioration, then reliability is improved, but display quality and brightness consistency may be compromised
Solution Approach 1:
The patent applies different emission time control strategies to different pixels based on their individual brightness history data. Each pixel's emission time is independently adjusted according to its usage pattern, allowing the system to maintain high brightness and display quality for pixels that need it while reducing emission time only for pixels that show signs of deterioration risk.
3Reliability
If brightness is uniformly reduced across all pixels, then OLED deterioration is minimized, but display quality and user experience are degraded
Solution Approach 1:
The patent implements pixel-level or block-level differentiated emission control based on accumulated brightness data. Instead of uniformly reducing brightness across the entire display, the system selectively adjusts emission time for specific pixels or blocks that have accumulated high brightness exposure, thereby maintaining overall display quality while preventing deterioration in specific areas.
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 minimizes OLED deterioration by optimizing emission times and brightness levels, maintaining display quality and extending the lifespan of the OLEDs.
Implementation Method 1
the organic light emitting diode display displays an image using organic light emitting diodes (OLEDs) that generate light by re-combination of electrons and holes
Data Source
AI summary
An organic light emitting diode display having improved display quality is disclosed. The organic light emitting diode display includes pixels positioned at intersections of scan lines and data lines, an emission control unit for controlling emission times of the pixels according to a second emission width signal indicating emission time information of the pixels, and an emission time controller for dividing the pixels into a plurality of blocks and for generating the second emission width signal according to a brightness history of the blocks.