LCD Backlight LED Intensity Compensation
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Solution Overview
Problem
Liquid crystal display (LCD) devices with LED backlight units experience decreased light intensity over time due to increased internal temperature, leading to image quality defects such as color deterioration.
Innovation Solution
Incorporating a backlight unit with first, second, and third light emitting diode arrays for red, green, and blue light, respectively, along with adaptive light-intensity compensators that detect and compensate for intensity variations using a light-intensity detector and compensator system to maintain optimal light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If LED backlight unit is used continuously for a long period, then power consumption is reduced and thin profile is achieved, but light intensity decreases due to heat generation and internal temperature increase
Solution Approach 1:
The patent employs a light intensity detector to continuously monitor the output intensity of the LED backlight unit and feeds this information back to a controller. The controller adjusts the driving current of the LEDs based on the detected intensity, compensating for the natural degradation and heat-induced intensity loss over time. This closed-loop feedback mechanism maintains stable light output while preserving the energy efficiency and thin profile advantages of LED technology.
Solution Approach 2:
The patent dynamically changes the operating parameters (driving current) of the LED backlight unit based on detected light intensity and temperature conditions. By adjusting the current through the LEDs in real-time, the system compensates for intensity degradation and maintains optimal performance throughout the operational lifespan, resolving the contradiction between continuous operation and light intensity maintenance.
2Use of energy by stationary object
If LED backlight unit operates for a long time, then power consumption is low, but internal temperature increases causing image quality defects such as color deterioration
Solution Approach 1:
The patent uses a light intensity detector and temperature sensor to continuously monitor operating conditions and feeds this information back to the controller. The controller adjusts LED driving parameters in real-time based on temperature and intensity feedback, preventing color deterioration and maintaining image quality stability throughout extended operation, thus resolving the reliability issue while maintaining low power consumption.
Solution Approach 2:
The system performs preliminary detection of light intensity and temperature conditions and takes preventive actions by adjusting driving parameters before significant color deterioration or image quality degradation occurs. This proactive approach maintains reliability and image quality while preserving the energy efficiency of continuous LED operation.
3Adaptability or versatility
If conventional backlight units are used, then design flexibility is limited, but implementing high-brightness backlight unit is difficult
Solution Approach 1:
The patent divides the backlight unit into multiple independently controllable LED arrays with different color characteristics (e.g., red, green, blue LEDs). Each array can be driven at different current levels and controlled independently, allowing flexible adjustment of overall brightness and color temperature. This segmentation enables the system to achieve high brightness levels while maintaining design flexibility through various control configurations.
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 adaptive light-intensity compensator system prevents a decrease in white light intensity, thereby enhancing image quality and maintaining consistent color reproduction over the operation time of the LCD device.
Implementation Method 1
Examples of the light source include electro-luminescence (EL) light sources, a light emitting diodes (LED)
Implementation Method 2
a light-intensity detector for detecting the intensity of the white light provided to the liquid crystal panel
Data Source
AI summary
A liquid crystal display (LCD) device is provided. The LCD device includes a liquid crystal panel, a backlight unit, first, second and third light emitting diode drivers, a light-intensity detector, and an adaptive light-intensity compensator. The backlight unit includes first, second and third light emitting diode arrays respectively generating red light, green light and blue light to provide white light to the liquid crystal panel. The first, second and third light emitting diode drivers generate operating voltages driving the first, second and third light emitting diode arrays, respectively. The light-intensity detector detects an intensity of white light provided to the liquid crystal panel. The adaptive light-intensity compensator controls the first, second and third light emitting diode drivers to compensate the intensities of the red light, the green light and the blue light, respectively.