Two-Dimensional Content-Adaptive Display Voltage Compensation
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Solution Overview
Problem
Electronic displays with self-emissive pixels face voltage errors due to internal resistance, leading to non-linear voltage drops that traditional one-dimensional compensation schemes fail to accurately address, resulting in inconsistent luminance and color across the display.
Innovation Solution
A content-adaptive two-dimensional digital compensation scheme combined with local analog compensation, which divides the display into zones based on image data to calculate and compensate for voltage errors, providing a fine-grain and robust pixel compensation by determining anticipated voltage errors and fine-grain voltage error gradients across column-driver integrated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one-dimensional voltage compensation schemes are used, then voltage compensation is provided proportional to distance from power supply, but the compensation fails to account for non-linear voltage errors and content-dependent variations
Solution Approach 1:
The display is divided into multiple zones (e.g., rows or columns) for independent voltage error measurement and compensation. Each zone has its own voltage error map generated based on local measurements, allowing the system to account for spatially varying voltage drops across different regions of the display panel.
Solution Approach 2:
The patent transitions from one-dimensional compensation (based solely on distance from power supply) to two-dimensional compensation by introducing zone-based spatial distribution. Voltage error maps are generated across multiple zones in both horizontal and vertical dimensions, capturing the full spatial complexity of voltage drops.
Solution Approach 3:
The compensation scheme dynamically adjusts compensation parameters based on displayed content characteristics (average luminance, peak luminance, content type). The system changes compensation strength and distribution according to content-dependent voltage drop patterns, moving from static to adaptive compensation.
2Measurement precision
If single-point calibration is performed, then voltage error is reduced near calibration point, but voltage error increases at other areas of the display
Solution Approach 1:
Instead of single-point calibration, the system performs multi-point calibration across multiple zones of the display. Each zone is calibrated independently to establish local voltage error characteristics, ensuring uniform accuracy across the entire display area rather than just at one location.
Solution Approach 2:
The system automatically performs voltage error measurements and generates compensation maps for each zone without requiring manual intervention. The calibration process is self-executing across all zones, eliminating the need for operator-dependent single-point calibration while maintaining display uniformity.
3Reliability
If global analog compensation is applied, then baseline voltage error is compensated across entire panel, but local voltage variations between columns are not accounted for
Solution Approach 1:
The system combines global analog compensation with zone-specific digital compensation. Each zone undergoes independent voltage error measurement and generates its own compensation map, allowing local variations to be corrected while maintaining the baseline compensation provided by the global analog scheme.
Solution Approach 2:
The patent merges analog compensation (providing baseline correction across the entire panel) with digital compensation (providing zone-specific precision correction). This hybrid approach combines the advantages of both methods to achieve both overall reliability and local precision.
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 accurate compensation for non-linear voltage errors, maintaining consistent luminance and color across the display, enhancing picture quality by accounting for varying voltage drops based on content and location.
Implementation Method 1
the voltage error or voltage drop is also often referred to as IR error or IR drop, corresponding to the electrical principle that voltage (V) is equal to current (I) multiplied by resistance (R) in a circuit
Data Source
AI summary
This disclosure provides various techniques for providing fine-grain digital and analog pixel compensation to account for voltage error across an electronic display. By employing a two-dimensional digital compensation and a local analog compensation, a fine-grain and robust pixel compensation scheme may be provided to the electronic display.