Organic EL Panel Brightness Correction Circuit
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Solution Overview
Problem
Organic EL panels suffer from uneven light emission due to manufacturing processes, leading to striped patterns of brightness variation across the panel, which existing methods struggle to correct without compromising manufacturing yield or increasing costs.
Innovation Solution
A method and circuit for detecting brightness unevenness at horizontal and vertical positions, generating correction data to adjust video signals in real-time, and storing this data for later use to correct light emission levels, ensuring uniformity across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the laser beam exposure process is used in TFT manufacturing, then the panel can be manufactured efficiently, but uneven light emission in striped fashion occurs due to uneven exposure
Solution Approach 1:
The patent applies preliminary action by measuring and creating correction data before actual display operation. The system measures brightness unevenness during a test period and generates correction data that is stored and applied in advance to compensate for the striped unevenness caused by the laser exposure process, thereby maintaining both manufacturing efficiency and display uniformity
Solution Approach 2:
The patent changes the brightness parameter dynamically by applying correction data that adjusts the drive signal levels for different regions of the panel. The correction data modifies the drive voltage or current parameters to compensate for the uneven exposure patterns, transforming the uniform brightness input into regionally-adjusted output that achieves visual uniformity
2Manufacturing precision
If correction data is stored in memory and applied to video signals, then uneven light emission is corrected, but the device complexity increases
Solution Approach 1:
The patent segments the correction process into distinct functional modules: a measurement unit that captures brightness data during a test period, a correction data generation unit that processes the measurement, a memory unit that stores the correction data, and an application unit that applies the correction to video signals. This segmentation allows each component to perform a specific function, simplifying the overall design while achieving uniformity correction
Solution Approach 2:
The patent introduces correction data as an intermediary element between the video signal input and the organic EL panel output. This correction data acts as a mediator that translates the relationship between drive signals and actual brightness, allowing the system to compensate for manufacturing variations without directly modifying the panel hardware or the video signal processing architecture
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 effectively corrects vertical and horizontal uneven light emission in organic EL panels, maintaining high manufacturing yield and productivity while providing high-quality images by adjusting video signals based on detected brightness variations.
Implementation Method 1
The signal current I flows through the organic EL element D. This causes the organic EL element D to emit light L at the brightness (emission intensity) associated with the magnitude of the signal current I.
Implementation Method 2
The TFT (Q) is supplied with a video signal voltage V. Therefore, the signal voltage V is converted into a signal current I by the TFT (Q).
Data Source
AI summary
A correction method for correcting uneven light emission of an organic EL panel, the correction method includes the steps of: supplying a predetermined signal to the organic EL panel to detect the brightness of the panel at horizontal and vertical scan positions; forming, based on a detection output thereof, correction data adapted to correct uneven brightness of the organic EL panel at a horizontal or vertical display position of the panel; storing the correction data in a memory; and reading the correction data from the memory during viewing to correct the level of a video signal supplied to the organic EL panel.