Multi-Light Source Drive Circuit Without Level Shift Stages
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Solution Overview
Problem
The drive circuit in existing light-emitting devices is complicated due to the inclusion of a level shift circuit, leading to a complex configuration.
Innovation Solution
A light-emitting device with n light sources, each connected to a power supply circuit and a switch controlled by a control circuit, which turns on and off the power supply voltage based on specific signals, simplifying the configuration by eliminating the need for level shift circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a level shift circuit is included in the drive circuit, then the light sources can be controlled, but the configuration becomes complicated
Solution Approach 1:
The patent extracts and removes the level shift circuit from the drive circuit configuration. By eliminating this component, the invention achieves the same control functionality for multiple light sources without the complexity introduced by level shifting, directly resolving the contradiction between control capability and circuit complexity
Solution Approach 2:
The drive circuit is designed to universally control multiple light sources (n≥2) through a simplified configuration. The circuit achieves multi-functionality by controlling different light sources with different drive currents without requiring separate level shift circuits for each, thus reducing overall complexity while maintaining comprehensive control capability
2Reliability
If multiple light sources are controlled with individual power supply circuits, then each light source receives appropriate power, but the device complexity increases
Solution Approach 1:
The patent merges the power supply control functionality into a unified drive circuit that can control multiple light sources simultaneously. Instead of having separate power supply circuits for each light source, the invention combines the control functions, achieving reliable individual power control while reducing the overall number of components and circuit complexity
Solution Approach 2:
The drive circuit dynamically adjusts the drive current for each light source based on control signals. This dynamic control capability allows the circuit to provide appropriate power to each light source as needed, maintaining reliability while avoiding the static complexity of dedicated power supply circuits for each light source
Data Source
AI summary
Provided is a light-emitting device capable of turning on a plurality of light sources with a simple configuration. The light-emitting device includes n (n≥2) light sources, n power supply circuits each provided for the n light sources, and a switch provided between a ground-side node of each of the n light sources and a ground. Each power supply circuit generates a power supply voltage for a corresponding one of the n light sources on the basis of a first signal, and stops generating the power supply voltage on the basis of a second signal, and the switch is turned on the basis of a light-on instruction and is turned off on the basis of a light-off instruction when the power supply voltage for the one light source is generated.