Backlight Zone Compensation for Display Defects
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Solution Overview
Problem
Existing display technologies face challenges in addressing distortions and defects in backlight units and liquid crystal panels, leading to non-uniform brightness and image quality issues, particularly in achieving efficient power management and cost-effective local dimming solutions.
Innovation Solution
A configurable backlight unit with planar emission devices distributed across zones, where the brightness levels are adjusted based on image tone and processed separately for each zone, combined with liquid crystal panel control signaling to compensate for distortions, allowing for flexible zone arrangements and resource optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming is implemented to improve display quality and contrast, then brightness uniformity and contrast ratio are improved, but power consumption and device complexity increase
Solution Approach 1:
The backlight unit is divided into multiple independently controllable zones, allowing selective dimming of specific regions rather than the entire display. This segmentation enables local brightness adjustment to improve contrast and uniformity while consuming less power compared to global dimming approaches.
Solution Approach 2:
Different zones of the backlight unit are assigned different brightness levels based on local display requirements. This local quality approach allows bright areas to maintain high illumination while dark areas are dimmed, achieving better overall brightness uniformity and contrast without uniformly increasing power consumption across the entire display.
2Reliability
If multiple zones with separate control are implemented, then display quality and defect compensation are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The display is divided into multiple zones that can be independently controlled and compensated. Each zone can be calibrated separately to compensate for manufacturing defects such as Mura effects, allowing targeted defect correction without requiring complex per-pixel control.
Solution Approach 2:
The brightness parameters of different zones are adjusted independently to compensate for defects. By changing the illumination parameters of specific zones rather than the entire display, the system achieves defect compensation with moderate complexity increases.
3Use of energy by stationary object
If zone-based backlight control is implemented, then power management efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The backlight unit is segmented into zones with independent power control, enabling efficient power management by activating or dimming only the zones required for current display content. This approach improves power management efficiency while maintaining reasonable manufacturing complexity through standardized zone-based 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 enhances display quality by compensating for defects, reduces power consumption, and achieves cost-effective local dimming, improving contrast and uniformity while minimizing computational and resource demands.
Implementation Method 1
a liquid crystal layer disposed proximate to the backlight unit, the liquid crystal layer configured to selectively filter the illumination provided by the backlight unit
Data Source
AI summary
An electronic device includes a backlight unit and a liquid crystal layer disposed proximate to the backlight unit. The backlight unit is configured to provide illumination across a viewable display area of the electronic device. The viewable display area includes a plurality of zones. The liquid crystal layer is configured to selectively filter the illumination provided by the backlight unit. A processor is coupled to the backlight unit and to the liquid crystal layer. The processor is configured to determine, based on data indicative of content to be displayed, a respective backlight brightness level of each zone of the plurality of zones and to generate liquid crystal control signaling for the liquid crystal layer. The processor is further configured to adjust the respective backlight brightness levels and/or the liquid crystal control signaling, to compensate for distortions arising from defects in the backlight unit and/or the liquid crystal layer.