Array Light Source Control for Uniform Projection Brightness
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Solution Overview
Problem
Conventional projection display technologies suffer from low contrast and inefficient light utilization due to fluorescence diffusion, leading to poor image gradation and distortion, particularly at image edges, which fails to meet brightness uniformity standards and reduces display clarity.
Innovation Solution
A display device with an array light source comprising edge and center light-emitting modules of varying luminous intensity, combined with a wavelength conversion apparatus and light modulation apparatus, and a control method that adjusts light-emitting power iteratively to optimize brightness distribution and reduce energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional monolithic light modulation apparatus is used, then device structure is simple, but contrast ratio is much lower than brightness resolution of human eyes resulting in poor image gradation
Solution Approach 1:
The patent divides the light source into an array of multiple light-emitting modules instead of using a single monolithic light source. Each module can be independently controlled to modulate light intensity, enabling precise brightness control and achieving high contrast ratio that matches human eye brightness resolution while maintaining reasonable device complexity through modular architecture.
2Illumination intensity
If edge light-emitting modules have greater luminous intensity than center modules, then brightness uniformity across the light field is improved, but device structure and control complexity increase
Solution Approach 1:
The patent implements local quality by assigning different luminous intensities to different regions of the light source array. Specifically, edge light-emitting modules are configured with greater luminous intensity than center modules to compensate for edge effects and achieve uniform brightness distribution across the entire light field. This regional differentiation is managed through an iterative control algorithm that adjusts module intensities based on their positional characteristics.
Solution Approach 2:
The patent employs dynamic control through an iterative algorithm that continuously adjusts the luminous intensity of individual light-emitting modules based on feedback about the overall light field distribution. This dynamic adjustment allows the system to adapt to variations in module performance and environmental conditions, maintaining brightness uniformity while managing structural complexity through software-based control.
3Loss of energy
If iterative algorithm is used to adjust light-emitting power, then light efficiency and energy saving are improved, but control complexity and calculation time increase
Solution Approach 1:
The patent implements feedback control through an iterative algorithm that calculates the actual light output of each module and compares it with the desired uniform distribution. Based on this feedback, the algorithm adjusts the power input to each light-emitting module to minimize energy waste and achieve optimal light efficiency. The feedback loop continues until convergence, ensuring energy-efficient operation while managing control complexity through systematic calculation procedures.
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
Enhances uniformity of the fluorescent light field, improves system light efficiency, and reduces image distortion by increasing the usable light field area, while ensuring the brightness meets display requirements and saving energy.
Implementation Method 1
the wavelength conversion apparatus is configured to convert the excitation light into excited light
Data Source
AI summary
Provided is an array light source. The array light source includes light-emitting modules, a wavelength conversion apparatus configured to convert excitation light into excited light, a control apparatus configured to transmit a light modulation signal, and a light modulation apparatus configured to modulate the excited light based on the light modulation signal, emit the modulated light, and form a modulated image. Each light-emitting module is configured to emit the excitation light. The light-emitting modules include edge light emitting modules distributed along an edge of the array light source and center light-emitting modules surrounded by the edge light-emitting modules. A maximum luminous intensity of the edge light-emitting modules is greater than that of the center light-emitting modules.