Circular Display Edge Luminance Gradient for Sawtooth Reduction
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Solution Overview
Problem
Circular display screens suffer from sawtooth, colorful, and bright edges due to step transitions and fixed RGB pixel arrangements, leading to suboptimal display performance.
Innovation Solution
The method involves dividing the edge area of a circular display screen into n display regions with different luminance levels, adjusting pixel luminance based on the central area's luminance and the luminance levels of each region, ensuring that the luminance decreases sequentially from the center to the edge, thereby reducing edge luminance and improving display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If adjacent pixels are configured to have step transitions at the edges of the display screen to fit arc edges, then the circular shape is achieved, but sawtooth artifacts and colorful edges appear
Solution Approach 1:
The edge area is divided into multiple display regions with different luminance levels, creating a gradient transition from the central area to the edge area. This segmentation approach replaces the abrupt step transition with gradual luminance changes, eliminating sawtooth artifacts and colorful edges while preserving the circular shape.
Solution Approach 2:
Different luminance levels are applied to different display regions within the edge area, with each region having a specific luminance level that varies from the central area outward. This local differentiation of luminance quality creates smooth transitions and eliminates the visual artifacts caused by uniform step transitions.
2Shape
If step transitions are used at the edges to achieve circular shape, then the circular display is formed, but bright edges are observed due to Mach band effect
Solution Approach 1:
The edge area is divided into multiple display regions with progressively decreasing luminance levels from the central area outward. This segmentation creates a luminance gradient that counteracts the Mach band effect, which causes perceived brightening at edges due to abrupt transitions.
Solution Approach 2:
The luminance parameter is systematically changed across different display regions, with each region having a different luminance level that decreases from the central area to the edge area. This parameter variation eliminates the perceived bright edges caused by the Mach band effect.
3Ease of manufacture
If rectangular pixels are used to form circular display, then manufacturing is simplified, but sawtooth artifacts appear at edges
Solution Approach 1:
The edge area is divided into multiple display regions with different luminance levels, creating a gradient that masks the rectangular pixel structure. This segmentation approach allows the use of simple rectangular pixels while achieving smooth visual edges through luminance variation.
Solution Approach 2:
Different luminance levels are applied to different display regions to compensate for the rectangular pixel structure at the edges. This local quality adjustment creates the appearance of smooth edges while maintaining the simplicity of rectangular pixel manufacturing.
Data Source
AI summary
A method to improve display performance at edges of a circular display screen is provided. The method comprises determining an edge area and a central area of the circular display screen, the edge area surrounding the central area; along a direction from a geometric center of the circular display screen to the edge area of the circular display screen, dividing the edge area into n display regions each having a different luminance-level, where n is a positive integer larger than 1; and according to luminance of pixels in the central area and the luminance-level of each of the n display regions, adjusting the luminance of the pixels in each of the n display regions to corresponding target luminance. Along the direction from the geometric center to the edge area of the circular display screen, the corresponding target luminance of the pixels in the n display regions sequentially decreases.