Real-Time White Balance Control for LED Displays
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Solution Overview
Problem
Display technologies using red, green, and blue LEDs face challenges in maintaining white balance due to changes in wavelength and brightness with temperature, requiring real-time compensation to ensure accurate color representation.
Innovation Solution
A real-time automatic white balance method that adjusts the luminance of LEDs using a control and driving module, coupled with a photo sensor and thermal sensor, calculates and adjusts the luminance of color light sources based on target values and temperature functions to maintain white balance during normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If red, green, and blue LEDs are used as light sources to achieve high color rendering index and high color diversity, then color variability is improved, but white balance stability deteriorates due to wavelength and brightness changes with temperature
Solution Approach 1:
The patent implements a feedback control system where a photosensor detects the actual luminance of the first color light source, and the control module uses this detected information to calculate and adjust the luminance of the second color light source, thereby maintaining white balance despite temperature-induced variations in LED characteristics
Solution Approach 2:
The patent dynamically adjusts the luminance parameter of the second color light source based on the detected luminance of the first color light source. By changing the luminance parameter in real-time according to temperature variations, the system maintains white balance while using multiple color LEDs for high color variability
2Stability of the object's composition
If real-time automatic white balance compensation is implemented using photo sensor and control module, then white balance stability is improved, but device complexity increases
Solution Approach 1:
The system performs self-adjustment by automatically detecting the luminance of the first color light source and autonomously calculating the required luminance for the second color light source to maintain white balance, eliminating the need for manual calibration and reducing operational complexity
Solution Approach 2:
The control module serves multiple functions: it stores target luminance values for both color light sources, detects actual luminance via the photosensor, calculates the required luminance for the second color light source, and controls its output. This multi-functionality reduces the need for separate dedicated components for each function
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 method effectively compensates for wavelength shifts caused by temperature changes, ensuring consistent color representation and image quality over time, even as LEDs age.
Implementation Method 1
A first target luminance of the first color light source and a second target luminance of the second color light source are provided. The luminance of the first color light source is detected to obtain a first current luminance.
Implementation Method 2
The thermal sensor detects a temperature T inside the display. The control and driving module calculates the second current luminance=a temperature function×the second target luminance×the first current luminance÷the first target luminance according to the temperature T.
Implementation Method 3
The luminance of the second color light source is adjusted according to the second current luminance. The control and driving module calculates the second current luminance according to the second target luminance and the ratio of the first target luminance to the first current luminance.
Data Source
AI summary
A display and a real-time automatic white balance method thereof are provided. The display includes a first color light source and a second color light source. The real-time automatic white balance method includes following steps. A first target luminance of the first color light source and a second target luminance of the second color light source are provided. A luminance of the first color light source is detected to obtain a first current luminance. A second current luminance of the second color light source is calculated according to a ratio of the first target luminance to the first current luminance and the second target luminance. A luminance of the second color light source is adjusted according to the second current luminance.