Display Apparatus Local Dimming Boundary Correction
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Solution Overview
Problem
Display apparatuses face significant resource loads when performing local dimming due to the need to manage luminance distribution and arithmetic operations across multiple light sources, leading to potential visual recognition of boundaries between adjacent areas with differing luminance.
Innovation Solution
A display apparatus with a light source controller and display controller that adjusts output gradation values by introducing virtual light sources to smooth luminance transitions between adjacent areas, reducing the resource load and minimizing visual boundary recognition through first and second corrections of output gradation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If local dimming is performed by controlling each light source individually, then luminance control precision is improved, but device complexity increases due to the need to manage luminance distribution and arithmetic operations across multiple light sources
Solution Approach 1:
The display area is divided into multiple partial areas corresponding to each light source, allowing independent luminance control of each region. This segmentation enables precise local dimming by matching each light source's output to its corresponding partial area's requirements, improving luminance control precision while managing complexity through structured division.
Solution Approach 2:
Different luminance characteristics are applied to different partial areas based on their specific requirements. Each light source is controlled independently to provide the appropriate luminance for its corresponding partial area, allowing precise local dimming without requiring complex global control mechanisms.
2Measurement precision
If local dimming is performed by performing arithmetic operations considering the relation between light sources, then luminance distribution accuracy is improved, but productivity decreases due to increased computational load
Solution Approach 1:
The display area is divided into multiple partial areas corresponding to each light source, allowing independent luminance control of each region. This segmentation enables precise local dimming by matching each light source's output to its corresponding partial area's requirements, improving luminance control precision while managing complexity through structured division.
Solution Approach 2:
Different luminance characteristics are applied to different partial areas based on their specific requirements. Each light source is controlled independently to provide the appropriate luminance for its corresponding partial area, allowing precise local dimming without requiring complex global control mechanisms.
3Measurement precision
If local dimming is performed by controlling each light source independently, then luminance control precision is improved, but visual boundaries between adjacent areas become more visible
Solution Approach 1:
The display controller performs preliminary correction of output gradation values for pixels in partial areas adjacent to boundaries. By anticipating and correcting for potential boundary visibility issues before they occur, the system maintains precise luminance control while reducing the visibility of boundaries between adjacent partial areas with different luminance levels.
Data Source
AI summary
According to an aspect, a display apparatus includes: a plurality of light sources; a display device that includes a display area provided with n1 pixels and that is irradiated with light from the light sources; a light source controller controlling an operation of the light sources; and a display controller controlling an output gradation value of part or all of the pixels. The display area includes a plurality of partial areas, the partial areas corresponding to the light sources on a one-to-one basis. The light source controller determines the amount of light emitted from each light source corresponding to a corresponding one of the partial areas based on luminance of light required for the corresponding partial area. The display controller performs first correction and second correction when the amounts of light emitted from two light sources corresponding to two adjacent partial areas are different.