Multi-Screen Luminance Correction for Projection Displays
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Solution Overview
Problem
Conventional multi-screen displays using projection type image display apparatuses suffer from luminance unevenness and 'black floating' due to low overlap accuracy, causing visible luminance differences at the boundaries between overlap and non-overlap regions, especially in black or low gradation display states.
Innovation Solution
An image processing apparatus that generates low gradation luminance correction values which gradually change from the overlap region to the non-overlap region, using a control unit to designate regions and generate correction coefficients and values, ensuring overall luminance evenness by adjusting the image signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a black correction luminance with a significant correction value is applied to the non-overlap region, then luminance evenness is improved, but visible luminance differences appear at the boundary due to low overlap accuracy
Solution Approach 1:
The patent applies different correction strategies to different regions: the overlap region receives a first correction value while the non-overlap region receives a second correction value. This local differentiation allows the boundary to be positioned where minimal correction is needed, preventing visible luminance differences while maintaining overall luminance evenness.
Solution Approach 2:
The image is divided into an overlap region and a non-overlap region, with each region receiving distinct correction values. This segmentation allows independent optimization of correction parameters for each zone, preventing boundary artifacts while achieving global luminance consistency.
2Manufacturing precision
If the overlap region is widened to compensate for low overlap accuracy, then boundary shift is reduced, but the effective image area decreases
Solution Approach 1:
Instead of uniformly widening the overlap region, the patent applies localized correction values specifically at the boundary areas. This targeted approach corrects boundary alignment issues without unnecessarily reducing the effective image area across the entire display.
3Manufacturing precision
If independent luminance adjustment units are used for overlap and non-overlap regions, then low gradation display evenness is improved, but device complexity increases
Solution Approach 1:
The patent implements independent luminance adjustment for the overlap and non-overlap regions by applying different correction values to each region. This local quality approach achieves low gradation display evenness while maintaining manageable system complexity through region-specific processing.
Data Source
AI summary
An image processing apparatus, which generates low gradation luminance correction values with respect to an overlap region and a non-overlap region of a plurality of images constituting a multi-screen display, generates the low gradation luminance correction values so as to make the values gradually change from the overlap region throughout the non-overlap region.