Dynamic Gamma Curve for LED Initial Brightness Fixing
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Solution Overview
Problem
The initial brightness level of LED light fixtures is uncertain and uneven, leading to difficult brightness adjustments, especially when multiple fixtures with different models are used simultaneously, causing inconsistent lighting and poor performance.
Innovation Solution
A method and system that employs a dynamic Gamma curve to fix the initial brightness level by customizing the Gamma correction based on the current Gamma value and refresh rate, using the formula G(x)={0(x=0)(1-b)xγ+b(0<x≤1), where b is the initial brightness PWM threshold, to ensure consistent and unified initial brightness across light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed Gamma curve is used for brightness adjustment, then the brightness can be adjusted according to the Gamma correction, but the initial brightness level becomes uncertain and uneven when refresh rate changes
Solution Approach 1:
The patent applies dynamics by transforming the fixed Gamma curve into a dynamic Gamma curve that automatically adapts to different refresh rates. The system calculates a compensation factor based on the relationship between the current refresh rate and a reference refresh rate, then uses this factor to adjust the Gamma curve parameters dynamically. This ensures that the initial brightness level remains consistent and reliable across different refresh rate settings while maintaining ease of brightness adjustment operation.
2Adaptability or versatility
If PWM duty ratio is increased to compensate for shorter period at higher refresh rates, then the light fixture can emit light at higher refresh rates, but the initial brightness level becomes larger and uneven
Solution Approach 1:
The patent applies parameter changes by introducing a compensation factor that dynamically adjusts the Gamma curve parameters based on the refresh rate. Instead of simply increasing the PWM duty ratio, the system modifies the Gamma curve's shape parameters to compensate for the shorter period at higher refresh rates. This ensures that the initial brightness level remains uniform and consistent across different refresh rates, while still maintaining adaptability to various refresh rate settings.
3Area of stationary object
If multiple light fixtures with different models are used simultaneously, then the lighting coverage is expanded, but the initial brightness level becomes uncertain and lighting becomes uneven
Solution Approach 1:
The patent applies universality by creating a dynamic Gamma curve that can adapt to different light fixture models and refresh rates. The system calculates a universal compensation factor based on the relationship between the current refresh rate and a reference refresh rate, which can be applied across multiple different light fixture models. This universal approach ensures that the initial brightness level remains consistent and reliable across all light fixtures in the system, while still maintaining expanded lighting coverage through multi-model compatibility.
Data Source
AI summary
A method for fixing an initial brightness level of lights is provided. Gamma correction is performed on the light based on a dynamic Gamma curve. When a user adjusts brightness of the light based on the dynamic Gamma curve, a dynamic Gamma curve image is valid all the time when a set current brightness level n changes from 0 to N, and when x>0, the dynamic Gamma curve image is continuous, and accordingly, brightness of the light continuously changes gradually. Further, by calculating an initial brightness PWM critical duty ratio D of light sources, the dynamic Gamma curve is customized according to the light, so that an initial brightness level position of the light sources in the same model is fixed and unified.