Backlight Color Temperature Adjustment Without Transmittance Loss
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Solution Overview
Problem
Conventional LCDs face a significant reduction in transmittance ratio when adjusting color temperature, which severely affects image quality due to the fixed color temperature of the backlight.
Innovation Solution
A backlight system comprising at least two light sources with different color temperatures and a control module that adjusts the color temperature by controlling the drive current of each light source, allowing for dynamic adjustment without altering the transmittance ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the color temperature of the LCD is adjusted by changing the deflection of liquid crystal molecules via software means, then the color temperature can be adjusted, but the transmittance ratio of the LCD panel is significantly reduced
Solution Approach 1:
The backlight system is segmented into multiple independent light sources with different color temperatures (warm white, cool white, daylight). Each light source can be controlled independently through PWM dimming, allowing the system to adjust color temperature without requiring the liquid crystal molecules to change their deflection angle, thereby avoiding transmittance ratio reduction.
2Ease of manufacture
If the color temperature of the backlight is fixed after manufacturing, then the manufacturing process is simplified, but the adaptability of the LCD to different viewing conditions is limited
Solution Approach 1:
The backlight system transitions from a fixed color temperature design to a dynamic adjustable design. By incorporating multiple light sources with different color temperatures and using PWM dimming control, the system can dynamically adjust the color temperature according to different ambient lighting conditions and user preferences, while maintaining a relatively simple manufacturing process.
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
Enables adjustment of color temperature in LCDs without reducing transmittance, thereby improving image quality by maintaining the original brightness and transmittance levels.
Implementation Method 1
at least two light sources with different color temperatures; and a control module configured to adjust a color temperature of the backlight by respectively controlling a drive current of each light source
Data Source
AI summary
A backlight and a control method for the backlight, and a display device are disclosed; a backlight includes: at least two light sources with different color temperatures and a control module configured to adjust a color temperature of the backlight by respectively controlling a drive current of each light source.