Near-Eye Display Pixel Mapping to Correct Luminance and Color Nonuniformity
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Solution Overview
Problem
Near-eye displays (NEDs) suffer from nonuniformity issues, causing visual artifacts like mottled appearances, bright or dark spots, and color casts due to imperfections in display pixels and optical paths, which are exacerbated by their proximity to the human eye.
Innovation Solution
A method and system for correcting nonuniformity in NEDs by generating test patterns, capturing images at the end of the optical path, fitting a mapping relationship between display pixels and image pixels, and determining a correction scheme based on this mapping to improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If test patterns are displayed and mapping relationships are fitted to correct nonuniformity, then luminance and chromaticity uniformity are improved, but device complexity and measurement time increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for each pixel in a lookup table before actual use. During operation, the system simply retrieves pre-computed correction data rather than performing complex real-time calculations, thus achieving uniformity correction without adding operational complexity.
Solution Approach 2:
The patent introduces an intermediary correction system consisting of test pattern generation, image capture device, and lookup table that mediates between the display and the viewer. This intermediary layer processes and corrects the optical output without requiring modification of the original display hardware or optical components.
2Measurement precision
If multiple test patterns are captured and processed, then mapping precision is improved, but measurement time and processing complexity increase
Solution Approach 1:
The patent segments the correction process into distinct phases: test pattern generation, image capture, mapping relationship fitting, and correction value storage. By dividing the complex measurement process into manageable segments that can be performed offline, the system achieves high precision without extending actual usage time.
Solution Approach 2:
The patent performs time-consuming measurements and calculations in advance during system setup or calibration phase. The resulting mapping relationships and correction values are stored for rapid retrieval during normal operation, effectively separating measurement time from operational time.
Data Source
AI summary
A method for correcting nonuniformity of a near-eye display (NED), including: generating and displaying a first plurality of test patterns for a display of the NED; obtaining, in response to the first plurality of test patterns, a first plurality of images at an end of an optical path coupled to the display; fitting a mapping relationship for each of display pixels of the display according to the first plurality of test patterns and the first plurality of images, the mapping relationship of a display pixel mapping the display pixel and a corresponding image pixel in each image of the first plurality of images; and determining a correction scheme for correcting nonuniformity of the NED based on the mapping relationship of each of the display pixels.