Display Apparatus Luminance Correction via LED Intensity Ratios
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Solution Overview
Problem
Display apparatuses using LEDs for primary colors face challenges in maintaining uniform luminance and chromaticity due to wavelength variations, leading to image quality degradation, particularly noticeable in the center of the visual field where blue LEDs exhibit significant nonuniformity.
Innovation Solution
A display apparatus and method that adjust light emission intensity ratios of LEDs in a two-dimensional array of pixels to determine correction factors, ensuring uniform luminance and chromaticity across pixels, using additive mixing to correct for wavelength variations, particularly in blue LEDs, to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs with high luminance and high color purity are used, then display brightness and color quality are improved, but wavelength variation between individual LEDs causes luminance and chromaticity nonuniformity across the display screen
Solution Approach 1:
The patent applies local quality by determining correction factors for each pixel or pixel group based on their specific luminance and chromaticity characteristics. The correction factors are calculated individually for each region to compensate for local wavelength variations, allowing each pixel to have customized correction parameters that address its specific nonuniformity issues while maintaining overall display consistency
Solution Approach 2:
The patent changes parameters by introducing correction factors that modify the drive signals to individual LEDs or pixel groups. These correction factors adjust the luminance and chromaticity parameters dynamically, compensating for manufacturing variations in wavelength and intensity without requiring physical changes to the LED components themselves
2Manufacturing precision
If correction factors are determined by adjusting light emission intensity ratios of LEDs in multiple pixels, then chromaticity uniformity is improved, but the complexity of the correction process increases
Solution Approach 1:
The patent segments the display into multiple pixel groups or regions, where correction factors are determined for each segment. This segmentation allows the complex correction process to be broken down into manageable units, where each segment's chromaticity can be corrected independently using additive mixing of primary colors, reducing the overall computational complexity compared to correcting the entire display as a single unit
Solution Approach 2:
The patent applies preliminary action by pre-calculating correction factors during the display setup or calibration phase. These correction factors are stored and then applied automatically during normal operation, eliminating the need for real-time complex calculations and reducing the operational complexity of the correction process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces visually recognizable chromaticity variations in the center of the retina, improving image quality by maintaining consistent luminance and chromaticity across the display, even with significant wavelength differences between blue LEDs, thereby enhancing color reproducibility and reducing brightness and hue discrepancies.
Implementation Method 1
each of the plurality pixels comprises a plurality of light-emitting devices that are each configured to emit a different color of light
Implementation Method 2
using additive mixing to correct for wavelength variations
Data Source
AI summary
A display apparatus may comprise a display section and circuitry. The display section may comprise a plurality of display units arranged in a two-dimensional array, wherein each of the display units comprises a plurality of pixels arranged in a matrix, and each of the plurality pixels comprises a plurality of light-emitting devices that are each configured to emit a different color of light. The circuitry may be configured to generate a corrected image signal based on an uncorrected image signal and correction factors that correct luminance and chromaticity of the light-emitting devices, including at least some correction factors determined by adjusting light emission intensity ratios of first light-emitting devices that are configured to emit light of a particular color and are disposed in different ones of the plurality of pixels.