Backlight Muntin and Cavity Sheet for Uniform Light Locality
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Solution Overview
Problem
Traditional backlight designs struggle to simultaneously achieve high locality and uniformity, leading to visual artifacts and inefficient power usage, as light from one subsection interferes with neighboring subsections, making it challenging to determine optimal brightness levels for each section.
Innovation Solution
The use of a muntin with reflective walls forming discrete zones and a cavity sheet with pinholes to create light mixing cavities, allowing for independent control of light sources and optimizing light propagation, combined with methods like peak-value and histogram-based illumination adjustments to account for neighboring zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional backlight designs spread light as far and wide as possible to achieve uniformity, then uniformity is improved, but locality deteriorates because light from one subsection interferes with neighboring subsections
Solution Approach 1:
The backlight unit is divided into multiple discrete zones using a muntin structure with reflective walls. Each zone contains its own light sources and is optically isolated from adjacent zones, allowing independent control of illumination in each section while preventing light interference between neighboring subsections.
Solution Approach 2:
A cavity sheet with pinholes is introduced as an intermediary element between the light sources and the display panel. This cavity sheet creates light mixing cavities that allow light to propagate and mix within each zone while the pinholes control and limit light spread, preventing interference with adjacent zones.
2Use of energy by moving object
If the illumination level is reduced to conserve power, then power consumption is improved, but image quality deteriorates due to visual artifacts and noticeable errors
Solution Approach 1:
The backlight is segmented into multiple independently controllable zones, allowing the illumination level to be optimized for each specific region based on the local image content. This enables power conservation in dark regions while maintaining high image quality in bright regions, resolving the contradiction between power consumption and image quality.
Solution Approach 2:
Different illumination levels are applied to different zones based on local image requirements. Each zone can have its brightness independently adjusted, allowing the system to conserve power in regions where low illumination is sufficient while maintaining high illumination in regions where image quality demands it.
3Reliability
If the illumination level is set high to achieve high image quality, then image quality is improved, but power consumption increases
Solution Approach 1:
The illumination level in each zone is dynamically adjusted based on the local image content and requirements. The system continuously monitors and adapts the brightness of each zone, transitioning between high and low illumination states as needed, thereby maintaining high image quality while minimizing power consumption throughout the display operation.
Solution Approach 2:
High illumination is applied only to specific zones where the image content requires it, rather than uniformly across the entire display. This localized approach to quality assurance allows the system to maintain high image quality in critical areas while conserving power in areas where lower illumination is sufficient.
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 light locality and uniformity, reducing visual artifacts and power consumption by allowing precise control of illumination levels in each zone, achieving high-quality images while conserving energy.
Implementation Method 1
The muntin includes reflective walls arranged to form a plurality of openings
Implementation Method 2
The cavity sheet has a plurality of pinholes and is configured to assemble with the muntin such that the reflective walls align with areas between the pinholes
Data Source
AI summary
A method and apparatus for effectively controlling light propagation are presented. The apparatus includes a muntin having reflective walls arranged to form a plurality of openings, and a cavity sheet disposed on the muntin. The muntin is configured to assemble with an array of light sources. The cavity sheet has a plurality of pinholes and is configured to assemble with the muntin such that the reflective walls align with areas between the pinholes. The light sources, the muntin, and the cavity sheet form light mixing cavities and light sources within each light mixing cavities may be individually controlled. The light mixing cavities allow generation of localized and uniform light.