Light Emitting Element Driving Circuit for Compact Design
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Solution Overview
Problem
Existing light emitting element driving circuits for devices like liquid crystal display devices and cameras require high current, leading to large power source circuits that increase the size of electronic apparatuses and limit design flexibility.
Innovation Solution
A light emitting element driving circuit that includes a capacitive element, a current limiting section to control charging current, a first constant current source for stabilizing discharging current, and a switch for controlling current supply to the light emitting element, allowing for compact design by reducing the charging current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a power source circuit with high current supply ability is used to drive the light emitting element, then the light emitting element can be driven properly, but the size of the power source circuit becomes large
Solution Approach 1:
The power source circuit is divided into two functional sections: a first power source circuit that supplies current at a normal level, and a second power source circuit that supplies current only during light emission periods. This segmentation allows each circuit to be optimized for its specific function, reducing the overall size while maintaining high current capability when needed.
Solution Approach 2:
The second power source circuit is configured to supply current preliminarily (only during light emission periods) rather than continuously. This preliminary action approach allows the circuit to be sized for peak performance only when required, rather than maintaining high current capability at all times, thereby reducing overall circuit size.
2Volume of stationary object
If a compact design is pursued to reduce device size, then the electronic apparatus becomes smaller, but the ability to supply current to the light emitting element may be insufficient
Solution Approach 1:
The system dynamically switches between the first power source circuit for normal operation and the second power source circuit for light emission periods. This dynamic configuration allows the device to maintain compact size while ensuring adequate current supply ability is available when needed for light emission.
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 enables miniaturization of the light emitting element driving circuit and device, reduces the size of the boosting circuit, and prolongs the life of the capacitive element while minimizing the risk of abnormal noise generation.
Implementation Method 1
a capacitive element; a current limiting section limiting a charging current for the capacitive element
Data Source
AI summary
Disclosed herein is a light emitting element driving circuit including: a capacitive element; a current limiting section limiting a charging current for the capacitive element; a first constant current source stabilizing a discharging current supplied from the capacitive element to a light emitting element; and a switch controlling ON and OFF in supplying the discharging current to the light emitting element. The capacitive element is charged with electricity from the power source circuit in the preceding stage through the current limiting section. Also, the electric charges in the capacitive element are discharged in the form of a given discharging current for the discharging time period, and the light emitting element emits light in accordance with the given discharging current. In this case, the charging current for the capacitive element is limited by the current limiting section in such a way that the current value thereof becomes small.