Multi-Color Backlight Control Circuit for LCDs
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Solution Overview
Problem
Current multi-color backlight control circuits for LCDs are inefficient due to the need for multiple voltage supply circuits and feedback control circuits to manage different operational voltages of red, green, and blue LEDs, leading to a complex hardware structure and higher costs.
Innovation Solution
A multi-color backlight control circuit that supplies a single output voltage to LED strings of different colors, allowing for varying voltage levels over time through feedback detection, and adjusts the number of LEDs or illumination time periods to balance brightness, while using current sources to control current amounts and under current detection to prevent voltage increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three separate voltage supply circuits and feedback control circuits are used for R, G and B LEDs, then each LED color can be controlled with appropriate voltage, but the hardware structure becomes complex and cost increases
Solution Approach 1:
The patent merges three separate voltage supply circuits and feedback control circuits into a single integrated control circuit. The circuit uses one voltage supply unit and one feedback control unit that can sequentially control R, G and B LEDs by switching between different LED strings, thereby reducing hardware complexity while maintaining voltage control accuracy for each LED color
Solution Approach 2:
The single voltage supply circuit and feedback control circuit are designed to perform multiple functions by sequentially controlling different LED color strings. The circuit can switch between controlling R LEDs, G LEDs, and B LEDs using the same hardware resources, making the control circuit universal and multi-functional
2Use of energy by moving object
If R, G and B LEDs sequentially emit light with same illumination time periods, then power efficiency is improved, but brightness balance is poor due to different operational voltages and LED counts
Solution Approach 1:
The patent implements dynamic control of illumination time periods for R, G and B LEDs based on feedback from photodetectors. The feedback control circuit adjusts the duty cycles or illumination durations of each LED color dynamically to achieve balanced overall brightness while maintaining sequential emission for power efficiency
Solution Approach 2:
The circuit changes the illumination time period parameter for each LED color string according to feedback detection. By adjusting the time period parameter dynamically, the system compensates for differences in operational voltages and LED counts to achieve brightness balance
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 solution simplifies the hardware structure, reduces costs, and improves power efficiency by allowing a single circuit to manage multiple LED colors with balanced brightness and illumination, while ensuring safe operation and preventing voltage over increases.
Implementation Method 1
a voltage supply circuit for receiving an input voltage and supplying a single output voltage to the plurality of LED strings of different LED colors
Implementation Method 2
a plurality of pins for electrically connecting with a plurality of LED strings of different LED colors
Implementation Method 3
red, green and blue (RGB) LEDs
Data Source
AI summary
The present invention discloses a multi-color backlight control circuit, comprising: a plurality of pins for electrically connecting with a plurality of LED strings of different LED colors; and a voltage supply circuit for receiving an input voltage and supplying a single output voltage to the plurality of LED strings of different LED colors. The present invention also discloses a multi-color backlight control method, comprising: supplying a single output voltage to a plurality of LED strings of different LED colors.