OLED Display Curved Corner Jagged Edge Luminance Adjustment
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Solution Overview
Problem
Display devices with delta-nabla arrangements suffer from conspicuous jagged edges (jags) at curved corners, which impair image quality due to the intense visibility of green subpixels oriented outward.
Innovation Solution
The OLED display device reduces the luminance of end pixels with outward-oriented green subpixels to a level lower than internal pixels, using a relative luminance converter to adjust luminance values based on their visibility and orientation, thereby minimizing the conspicuousness of jagged edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If delta-nabla arrangement is used with curved corners, then design aesthetics are improved, but jagged edges become conspicuous at curved corners
Solution Approach 1:
The patent applies local quality by differentiating the treatment of end pixels from internal pixels. Specifically, end pixels located at curved corners have their luminance values adjusted differently compared to internal pixels. The system identifies pixels at curved corners and applies a luminance correction that reduces the intensity of green subpixels at these locations, thereby locally addressing the jagged edge problem without affecting the overall display quality.
Solution Approach 2:
The patent employs parameter changes by modifying the luminance values of end pixels based on their position and orientation. The system calculates adjusted luminance values for end pixels by considering the luminance values of adjacent pixels and the orientation of green subpixels. This parameter adjustment reduces the conspicuousness of jagged edges at curved corners while maintaining natural color reproduction through controlled luminance scaling.
2Object-affected harmful factors
If luminance of end pixels is reduced to minimize jags, then image quality is improved, but color consistency may be affected
Solution Approach 1:
The patent implements feedback by using the luminance values of adjacent pixels to determine the appropriate luminance adjustment for end pixels. The system calculates the luminance values of neighboring pixels and uses this information to compute the adjusted luminance for end pixels. This feedback mechanism ensures that the luminance reduction is proportional and context-dependent, preventing excessive dimming that would compromise color consistency while still effectively reducing jagged edge visibility.
Solution Approach 2:
The patent carefully controls parameter changes by adjusting only the luminance values of end pixels while preserving the chromaticity relationships. The system calculates adjusted luminance values that are lower than original values but maintains the relative color balance by proportionally scaling all subpixel components (red, green, blue) within each end pixel. This ensures that color consistency is maintained even as luminance is reduced to minimize jagged edges.
Data Source
AI summary
First type of pixel lines include first type of end pixels each disposed at the end on the opposite side of the first direction and at the end on the opposite side of the second direction of a pixel line extending in the second direction. The second type of pixel lines include second type of end pixels each disposed at the end on the opposite side of the first direction and at the end on the opposite side of the second direction of a pixel line extending in the second direction. Luminance values of the plurality of first type of end pixels are smaller than luminance values of internal pixels surrounded by other pixels in four directions of the first direction, the opposite direction of the first direction, the second direction, and the opposite direction of the second direction in response to the same input picture signal.