OLED Pixel Uniformity Compensation via Parametric Scaling
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Solution Overview
Problem
Electronic displays, such as OLEDs, often suffer from non-uniform pixel properties leading to visible artifacts due to differences in component age, operating temperatures, and material properties, which existing compensation methods struggle to fully address.
Innovation Solution
The use of a per-pixel or per-group-of-pixels function to predict a brightness-to-data relationship, allowing for the generation of a compensated data signal that accounts for non-uniformities, thereby reducing visual artifacts by adjusting programming voltages or currents to achieve target brightness levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional compensation methods are used to address pixel non-uniformity, then some level of artifact reduction is achieved, but the methods cannot fully eliminate visual artifacts due to limitations in addressing all sources of non-uniformity
Solution Approach 1:
The patent applies parameter changes by using multiple compensation parameters (gamma, offset, slope, curvature) to adjust the programming voltages or currents for each pixel. These parameters are derived from measured brightness data and are used to transform the input signal to compensate for pixel non-uniformities across different brightness levels, thereby reducing visual artifacts.
Solution Approach 2:
The patent segments the display into multiple regions and performs separate compensation measurements and calculations for each region. This allows the system to capture spatial variations in pixel non-uniformity and apply region-specific compensation parameters, improving the overall uniformity across the entire display.
2Object-generated harmful factors
If per-pixel compensation functions are implemented to predict brightness-to-data relationships, then visual artifacts are significantly reduced, but the complexity of the compensation system increases
Solution Approach 1:
The patent uses a compact parametric model with a small number of parameters (gamma, offset, slope, curvature) to represent the brightness-to-data relationship for each pixel or region. This approach avoids the need for storing extensive lookup tables while still capturing the non-linear behavior of OLED pixels across different brightness levels, thereby reducing system complexity.
Solution Approach 2:
The patent performs compensation parameter measurements and calculations during the display manufacturing or calibration process, storing the derived parameters for later use. This preliminary action allows the compensation system to operate efficiently during normal display operation without requiring real-time measurements or complex computations.
3Manufacturing precision
If comprehensive compensation parameters are used to account for all non-uniformity sources, then pixel uniformity is improved, but the amount of data that needs to be stored and processed increases
Solution Approach 1:
The patent represents the brightness-to-data relationship using a compact parametric model with only four parameters (gamma, offset, slope, curvature) per region, instead of storing extensive brightness measurement data for multiple voltage levels. This parametric representation dramatically reduces the data volume while still enabling accurate compensation across the full brightness range.
Solution Approach 2:
The patent performs the computationally intensive measurements and parameter fitting during the calibration phase, transforming raw brightness data into compact parametric forms. This preliminary processing reduces the data volume that needs to be stored and processed during normal operation, as only the derived parameters need to be retained.
4Manufacturing precision
If region-specific compensation is applied to address spatial non-uniformities, then display uniformity is improved, but the complexity of managing multiple region parameters increases
Solution Approach 1:
The patent divides the display into multiple regions and applies separate compensation parameters to each region to address spatial non-uniformities. This segmentation allows the system to capture and compensate for regional variations in pixel characteristics while maintaining a manageable structure through systematic parameter organization.
Solution Approach 2:
The patent uses a universal parametric model structure (gamma, offset, slope, curvature) that can be applied to any region of the display. This universal approach provides a consistent framework for managing region-specific parameters, reducing the complexity compared to using different compensation methods for different regions.
Data Source
AI summary
A system may include an electronic display panel having pixels, where each pixel may emit light based on a respective programming signal. The system may include a memory storing a map. The processing circuitry may determine a function for each pixel from the map. The processing circuitry may determine a respective control signal based on the function and a target brightness level for each pixel to generate multiple control signals, where the respective control signal is used to generate the respective programming signal for each pixel. The processing circuitry may determine a scaling factor based at least in part on the first map and may scale at least a subset of the multiple control signals based at least in part on the scaling factor.