Display Burn-In Calibration for Backlight Uniformity
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Solution Overview
Problem
Display devices suffer from 'burn-in' issues, where images persist even when not in use, leading to calibration challenges and artifacts due to non-uniform backlights and other anomalies.
Innovation Solution
A method and device that utilize retention or 'burn-in' properties of displays to adjust images and compensate for artifacts by energizing spatial light modulators during power-off or blanking intervals, creating a persistence image that can be mixed with the displayed image to improve uniformity and compensate for decay over time, and detect malfunctions to adjust modulation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If retention or burn-in properties are utilized to compensate for backlight non-uniformities, then image quality and uniformity are improved, but display artifacts and calibration challenges worsen
Solution Approach 1:
The patent converts the harmful retention/burn-in effect that causes display artifacts into a beneficial calibration mechanism. By intentionally applying retention during blanking intervals to create a persistence image that compensates for backlight non-uniformities, the system transforms what was previously a defect into a useful tool for improving image uniformity and quality.
Solution Approach 2:
The system performs preliminary calibration actions during blanking intervals before the actual display content is shown. The controller energizes the spatial light modulator with calibration patterns during these intervals to pre-establish the persistence image that will compensate for backlight non-uniformities in the subsequent displayed image.
2Illumination intensity
If screen savers are used to prevent burn-in, then display uniformity is improved, but additional processing power and energy consumption increase
Solution Approach 1:
The display system uses its own retention property to perform self-calibration without requiring external processing power. The spatial light modulator's inherent retention characteristic is leveraged to automatically compensate for backlight non-uniformities, eliminating the need for separate screen saver processes or additional computational resources for calibration.
Solution Approach 2:
The calibration process occurs continuously during blanking intervals without interrupting normal display operations. The persistence image is maintained and updated during these intervals, providing continuous compensation for backlight non-uniformities while the display is in use, rather than requiring periodic interruptions or separate calibration sessions.
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 enhances image quality by compensating for backlight non-uniformities and anomalies, increasing the usable range of adjustments for LCD pixels and maintaining image quality without requiring additional processing power, while also addressing decay and malfunctions.
Implementation Method 1
a controller configured to energize the spatial light modulator in a manner that causes the spatial light modulator to exhibit retention (also referred to as persistence)
Data Source
AI summary
A “burn-in” is purposely performed on an LCD panel. The “burn-in” is calculated to compensate for an artifact or malfunction of a display using the LCD panel. The “burn-in” may be calculated, for example, to compensate for brightness levels in a light field emanating from the backlight of a dual modulation display. The burn in performed, for example, during periods of “power-off” of the display (e.g., when the backlight of an LCD is off).