Display Backlight Luminance Compensation for Halo Reduction
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Solution Overview
Problem
Conventional sub-millimeter LED displays face challenges in maintaining optical performance during local dimming, leading to reduced resolution and image distortion due to changes in gamma value and luminance compensation, which also cause halo generation.
Innovation Solution
A method for maintaining optical quality of a display that involves a driving unit configured to provide a preset gamma value, perform local dimming of the backlight unit, calculate luminance differences, and apply luminance compensation to maintain consistent luminance and gamma value without reducing image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming is performed to save power, then power consumption is reduced, but gamma value changes and optical performance deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the driving unit measures the actual luminance of the backlight unit after local dimming, compares it with the expected luminance, and adjusts the driving signals to compensate for gamma value changes. This closed-loop control ensures optical performance is maintained while achieving power savings through local dimming.
Solution Approach 2:
The patent dynamically adjusts the gamma value parameter based on the local dimming operation. The driving unit calculates a compensation value based on the measured luminance difference and applies it to correct the gamma value, transforming the adverse parameter change into a controlled adjustment that maintains optical performance.
2Illumination intensity
If luminance compensation is applied to maintain brightness, then luminance is improved, but halo generation increases and resolution decreases
Solution Approach 1:
The patent applies local quality by performing luminance compensation only in specific regions where luminance degradation occurs during local dimming. The driving unit identifies areas requiring compensation and applies targeted adjustments rather than uniform compensation across the entire display, thereby maintaining luminance without causing widespread halo generation that would reduce overall image resolution.
Solution Approach 2:
The patent performs preliminary measurement of the backlight unit's luminance characteristics before and after local dimming operations. By pre-characterizing the luminance response and measuring actual performance, the system can predict and compensate for luminance changes in advance, preventing halo generation before it occurs rather than reacting after degradation has happened.
3Stability of the object's composition
If gamma value is adjusted for luminance compensation, then luminance consistency is improved, but image data distortion increases
Solution Approach 1:
The patent applies partial action by adjusting the gamma value only to the extent necessary to compensate for luminance degradation, rather than applying full compensation that would cause over-correction and distortion. The driving unit calculates the minimum required gamma adjustment based on measured luminance differences, applying just enough compensation to maintain consistency without inducing image data distortion.
Data Source
AI summary
A method for maintaining optical quality of a display and a display thereof are provided, wherein the display includes a backlight unit, a display unit, and a driving unit, and the method includes: providing a preset gamma value of the display; driving the driving unit based on the preset gamma value of the display to obtain a first display luminance corresponding to the backlight unit according to the preset gamma value; performing local dimming of the backlight unit in the display to obtain a second display brightness value of each area in the measured backlight unit; receiving, by the driving unit, the second display brightness value to compare the second display brightness value with the first display brightness value for obtaining a luminance difference; and providing the brightness difference into the backlight unit for brightness compensation, so that the backlight unit has a third display brightness value.