Dynamic Voltage Boosting for LED Driving Circuits
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Solution Overview
Problem
Existing light-emitting element driving circuits for portable devices face inefficiencies in current consumption due to wasteful operation of voltage boosting circuits, as they continue to boost voltages even when ambient conditions or image brightness requirements change, leading to unnecessary energy usage.
Innovation Solution
A light-emitting element driving circuit that includes a luminosity determining unit, brightness setting unit, detecting and comparing unit, and voltage boost determining unit, which dynamically decides whether to activate or deactivate the voltage boosting circuit based on luminosity, brightness, or video image information, ensuring efficient operation by only boosting voltages when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the current value of current flowing through the backlight is increased to increase brightness, then the brightness of the backlight is improved, but the forward voltage increases and terminal voltage decreases, causing the voltage boosting circuit to activate and increase current consumption
Solution Approach 1:
The patent implements dynamic control of the voltage boosting circuit by continuously monitoring terminal voltage and comparing it with a reference voltage. The boosting circuit is activated only when terminal voltage falls below the reference voltage, and deactivated when terminal voltage rises above it. This dynamic on/off control based on real-time voltage conditions prevents unnecessary boosting operation and reduces current consumption while maintaining required brightness levels.
Solution Approach 2:
The patent employs a feedback mechanism where the terminal voltage of the light-emitting element is continuously detected and fed back to the voltage boosting control unit. The control unit compares the detected terminal voltage with a reference voltage and adjusts the boosting circuit operation accordingly. This closed-loop feedback control ensures the boosting circuit operates only when necessary to maintain proper voltage levels, preventing wasteful current consumption.
2Reliability
If the voltage boosting circuit is activated to boost terminal voltage when current is increased, then the terminal voltage is maintained, but the circuit remains in operating state even when current is reduced later, causing wasteful current consumption
Solution Approach 1:
The patent implements dynamic control of the voltage boosting circuit by continuously monitoring terminal voltage and comparing it with a reference voltage. The boosting circuit is activated only when terminal voltage falls below the reference voltage, and deactivated when terminal voltage rises above it. This dynamic on/off control based on real-time voltage conditions prevents unnecessary boosting operation and reduces current consumption while maintaining required brightness levels.
Solution Approach 2:
The patent employs a feedback mechanism where the terminal voltage of the light-emitting element is continuously detected and fed back to the voltage boosting control unit. The control unit compares the detected terminal voltage with a reference voltage and adjusts the boosting circuit operation accordingly. This closed-loop feedback control ensures the boosting circuit operates only when necessary to maintain proper voltage levels, preventing wasteful current consumption.
Data Source
AI summary
A light-emitting element driving circuit (10) comprises a luminosity determining unit (70) which determines luminosity, outputs a luminosity determination result, and outputs brightness change information, a brightness setting unit (60) which outputs brightness setting information and outputs brightness change information, a light-emitting element driving unit (40) which drives a light-emitting element with a current of a current value corresponding to the brightness setting information, a detecting and comparing unit (50) which compares a terminal voltage of the light-emitting element and a predetermined voltage, a voltage boost determining unit (30) which determines whether or not a terminal voltage of the light-emitting element is to be boosted based on at least one of the luminosity change information and the brightness change information, and a voltage boosting circuit section (20) which boosts the terminal voltage of the light-emitting element when it is determined that the voltage is to be boosted and does not boost the terminal voltage of the light-emitting element when it is determined that the voltage is not to be boosted.