Display Panel Luminance Correction via Curved Target Distribution
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Solution Overview
Problem
Existing display devices face challenges in correcting luminance unevenness, particularly in high-luminance areas, where the correction value exceeds the maximum grayscale value, leading to uncorrectable areas and reduced image quality.
Innovation Solution
A method is introduced to calculate correction values by setting a target luminance value with a curved distribution across the display panel, ensuring that the correction values do not exceed the maximum grayscale value, allowing for uniform correction across all luminance areas without lowering overall luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a uniform target luminance value is used across the display panel, then correction is simple to implement, but uncorrectable areas occur in high-luminance regions where correction values exceed maximum grayscale
Solution Approach 1:
The patent applies local quality by setting different target luminance values for different regions of the display panel. Specifically, the center region has a higher target luminance value than the peripheral regions, creating a curved distribution that matches the panel's luminance characteristics. This regional differentiation allows correction values to remain within valid grayscale ranges across all areas, eliminating uncorrectable regions while maintaining overall correction effectiveness.
2Manufacturing precision
If correction values are increased to improve luminance uniformity in dark areas, then low-luminance uniformity improves, but correction values exceed maximum grayscale in high-luminance areas
Solution Approach 1:
The patent changes the parameter of target luminance values from a uniform constant to a spatially varying distribution. By setting the center target luminance higher than peripheral target luminance values, the correction algorithm can operate within valid grayscale ranges for all pixels. This parameter transformation maintains luminance uniformity improvement in dark areas while preventing overflow in bright areas.
3Reliability
If overall target luminance is lowered to prevent correction overflow, then uncorrectable areas are eliminated, but overall luminance and image quality deteriorate
Solution Approach 1:
The patent avoids overall luminance reduction by implementing local quality differentiation. The center region maintains a higher target luminance value that preserves overall image brightness and quality, while peripheral regions use lower target luminance values that prevent correction overflow. This localized approach eliminates uncorrectable areas without sacrificing overall luminance levels.
Data Source
AI summary
A method of calculating a correction value used when signal value correction is performed with respect to an image signal supplied to a display panel includes setting a target luminance value, which is not uniform in an overall surface of the display panel, as a target luminance value of one image signal value such that at least a portion of a distribution of target luminance values at each plane position of the display panel becomes a curved distribution, and calculating a correction value at each plane position of the display panel using luminance observed at each plane position of the display panel when one image signal value is given to the overall surface of the display panel and the target luminance value at each plane position of the display panel.