Multi-Sensor Backlight Control for LED Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices using backlight units face challenges in achieving uniform brightness distribution due to variations in light wavelength and intensity emitted by LED devices, which are affected by energy band gap changes during operation.
Innovation Solution
A light device with a multi-sensor unit, comprising color sensors, is integrated into the backlight unit to analyze and feedback wavelength and intensity data, allowing a backlight control unit to adjust the duty ratio of LED devices for uniform brightness through pulse width modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED devices are used as light sources in backlight units, then energy efficiency and lifespan are improved, but uniform brightness distribution deteriorates due to energy band gap changes affecting light wavelength and intensity
Solution Approach 1:
The patent employs sensors to detect the actual light output characteristics of LED devices and feeds this information back to a control unit. The control unit then adjusts the driving parameters of individual LEDs based on the detected variations, compensating for energy band gap changes and maintaining uniform brightness distribution across the display panel.
Solution Approach 2:
The system dynamically changes the driving parameters (such as current or pulse width modulation duty cycle) of individual LED devices based on detected light output variations. By adjusting these parameters in real-time, the system compensates for energy band gap drift and maintains consistent brightness uniformity while preserving the energy efficiency benefits of LED technology.
2Productivity
If LED devices operate continuously, then productivity is improved, but brightness uniformity deteriorates due to energy band gap changes over time
Solution Approach 1:
The continuous monitoring and feedback mechanism tracks light output variations that occur during prolonged operation. As LEDs age and their energy band gaps shift, the sensors detect these changes and the control unit continuously adjusts driving parameters to maintain brightness uniformity, enabling sustained productive operation without degradation of display quality.
Solution Approach 2:
The system transitions from static LED driving to dynamic adjustment, where driving parameters are continuously modified based on real-time light output detection. This dynamic adaptation allows the system to maintain optimal brightness uniformity throughout the entire operational lifespan of the LED devices, supporting continuous productivity.
3Illumination intensity
If multi-sensor units are added to detect light wavelength and intensity, then brightness uniformity control is improved, but device complexity increases
Solution Approach 1:
The sensor unit is designed to perform multiple functions: detecting light intensity, measuring wavelength shifts, and providing feedback for control adjustments. By consolidating these detection capabilities into a single integrated sensor module, the system achieves comprehensive brightness uniformity control without proportionally increasing device complexity.
Solution Approach 2:
The addition of multi-sensor units creates a closed-loop feedback system that automatically compensates for LED variations. While sensors increase hardware complexity, the automated feedback control reduces the need for manual calibration and complex mechanical adjustment mechanisms, ultimately simplifying the overall system architecture compared to alternative approaches for achieving brightness uniformity.
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 ensures uniform brightness distribution across the LCD panel by dynamically controlling LED devices based on real-time light emission data, addressing the non-uniformity issues caused by energy band gap changes in LED devices.
Implementation Method 1
a multi-sensor unit included in a light emission region of the backlight unit capable of sensing a wavelength and/or intensity of light emitted from the light emitting diode devices
Implementation Method 2
backlight unit comprising light emitting diode (LED) devices
Implementation Method 3
light emitting diode devices
Data Source
AI summary
Provided is a light device. The light device comprises a backlight unit, a multi-sensor unit, a backlight driving unit, and a backlight control unit. The backlight unit comprises light emitting diode devices to provide light. The multi-sensor unit is included in a light emission region of the backlight unit and senses a wavelength and/or intensity of light emitted from the light emitting diode devices and transmits sensed values as feedback. The backlight driving unit supplies driving power to the light emitting diode devices, and the backlight control unit receives the sensed values from the multi-sensor unit to control the light emitting diode devices through the backlight driving unit.