LED Luminance Switching Device with Memory Unit
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Solution Overview
Problem
Conventional luminance switching systems using LEDs face issues with uneven light emission due to the influence of neighboring LEDs, making it difficult to achieve precise multi-stage luminance adjustments and control.
Innovation Solution
A luminance switching device with a built-in memory unit that stores luminance values for each LED, a changeover switch with multiple modes, a detecting circuit for monitoring these modes, and a power conversion circuit to adjust the luminance of LEDs, ensuring consistent light output across multiple stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LEDs are turned off sequentially according to conventional changeover switch operation, then multi-stage luminance switching is achieved, but uneven luminance distribution occurs due to neighboring LED influence
Solution Approach 1:
The patent divides the LED array into multiple independently controllable groups or individual LEDs, allowing each LED or group to be controlled separately through a memory unit that stores luminance values for each LED. This segmentation enables precise control of each LED's luminance to compensate for neighboring LED influence while maintaining multi-stage switching capability.
Solution Approach 2:
The patent applies local quality by assigning different luminance values to different LEDs based on their specific positions and neighboring LED influences. The memory unit stores individual luminance values for each LED, allowing localized adjustment of luminance characteristics to achieve uniform overall luminance distribution while maintaining multi-stage switching.
2Ease of operation
If conventional changeover switch is used for bulb switching, then simple switching operation is achieved, but precise luminance control for each LED is not possible
Solution Approach 1:
The patent makes the changeover switch multi-functional by integrating it with a memory unit that can store and retrieve luminance values for multiple LEDs. The switch not only performs conventional on/off and multi-stage switching functions but also triggers precise luminance control operations, allowing a single component to serve multiple control purposes.
Solution Approach 2:
The patent implements feedback by having the detecting circuit monitor the actual luminance output of each LED and comparing it with the desired luminance values stored in the memory unit. The system adjusts the drive signals to each LED based on this feedback to achieve precise luminance control while maintaining simple switch operation.
3Measurement precision
If photo-detectors are used to detect LED luminance for control, then luminance detection is achieved, but neighboring LED light interference prevents accurate individual LED control
Solution Approach 1:
The patent extracts the luminance detection function from the control system and implements it through individual detecting circuits directly associated with each LED or LED group. This separation allows each detecting circuit to focus on monitoring its specific LED's luminance output, reducing the impact of neighboring LED light interference while maintaining detection accuracy.
Solution Approach 2:
The patent introduces the memory unit as an intermediary between the detecting circuits and the control signals. The memory unit stores reference luminance values and compares them with detected values, mediating the control process to achieve precise luminance regulation for each LED while compensating for neighboring LED influences through stored compensation data.
Data Source
AI summary
An illuminating device and a luminance switching device thereof for controlling luminance of light emitting states of LED light source are provided. The luminance switching device includes a changeover switch which is electrically connected to the luminance switching device for switching the light-emitting states of the LED light source and has switching modes corresponding to the light-emitting states, a detecting circuit for detecting the switching mode corresponding to the changeover switch, a memory unit for storing luminance values of the LED light source corresponding to the switching modes detected by the detecting circuit, converting the luminance values of the LED light source into a luminance control signal, and transmitting the luminance control signal to the detecting circuit, and a power conversion circuit for receiving the luminance control signal transmitted from the detecting circuit, such that the LED light source produces luminance of the light-emitting states corresponding to the switching modes.