LED Panel Low-Luminance Pixel Layout for Smooth HDR Celestial Display
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Solution Overview
Problem
Conventional LED panels struggle to achieve a high dynamic range, particularly in displaying celestial bodies with a wide brightness variation, such as from bright planets to dark stars, due to limitations in PWM bit resolution, leading to abrupt brightness changes and flickers in low luminance areas.
Innovation Solution
Incorporating a low-luminance element with a white LED element, alternately arranged with normal red, green, and blue elements, and using separate PWM signal generators and light attenuation methods to reduce luminance without decreasing drive current, enabling a higher dynamic range and smoother brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PWM bit resolution is increased to achieve smooth brightness change, then luminance control precision is improved, but noise susceptibility and flicker increase
Solution Approach 1:
The patent divides the luminance control into multiple segments by using multiple PWM signal generators with different bit resolutions (12-bit for high luminance, 16-bit for low luminance) and multiple current limiting circuits with different current set values. This segmentation allows each segment to be optimized independently, achieving smooth brightness control without excessive noise susceptibility.
Solution Approach 2:
The patent changes the PWM signal parameters (bit resolution and pulse width) based on the luminance range. For low luminance ranges, it uses 16-bit resolution with smaller pulse widths, while for high luminance ranges, it uses 12-bit resolution with larger pulse widths. This dynamic parameter adjustment optimizes both precision and noise resistance across different brightness levels.
2Illumination intensity
If PWM bit resolution is increased to achieve high dynamic range, then luminance range is improved, but device complexity increases
Solution Approach 1:
The patent segments the luminance control system into multiple independent circuits, each handling a specific luminance range. This includes multiple current limiting circuits with different current set values and multiple PWM signal generators with different bit resolutions. By segmenting the system, the patent achieves a wide luminance range (high dynamic range) while keeping each individual circuit relatively simple and manageable.
Solution Approach 2:
The patent uses 16-bit PWM resolution only for low luminance ranges where it is needed, rather than using 16-bit resolution across the entire luminance range. This partial application of high-resolution control achieves the required dynamic range while avoiding the complexity and resource overhead of using high-resolution control everywhere.
3Measurement precision
If minimum pulse width is used to achieve lowest brightness level, then luminance precision is improved, but human eye perception causes abrupt brightness change
Solution Approach 1:
The patent changes the PWM signal parameters based on the luminance range. For low luminance ranges, it uses 16-bit resolution with smaller pulse widths to achieve smooth brightness transitions that are imperceptible to the human eye. For high luminance ranges, it uses 12-bit resolution with larger pulse widths. This dynamic parameter adjustment ensures smooth perception across all brightness levels.
Solution Approach 2:
The patent uses higher bit resolution (16-bit) only for low luminance ranges where smooth transitions are most critical and perceptible to the human eye. For high luminance ranges, 12-bit resolution is sufficient. This partial application of high-resolution control achieves perceptual smoothness where needed while avoiding unnecessary complexity elsewhere.
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
This configuration allows for a more realistic representation of celestial bodies with a high dynamic range, reducing costs and minimizing flickers, while maintaining a wide brightness range perception.
Implementation Method 1
a low-luminance element configured to provide an output having luminance lower than the lowest luminance of the normal element
Implementation Method 2
each of the plurality of self-emissive pixel units includes: a normal element including a red element including a self-emissive element, a green element including a self-emissive element, and a blue element including a self-emissive element
Data Source
AI summary
An LED panel includes a plurality of LED pixel units being arranged. Each of the plurality of LED pixel units includes: a normal element including a red LED element, a green LED element, and a blue LED element; and a low-luminance element configured to provide an output having luminance lower than the lowest luminance of the normal element.