LED Luminance Switching Device with Memory Unit for Uniformity
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Solution Overview
Problem
Conventional luminance control systems for LED lighting face challenges in achieving uniform multi-stage luminance switching due to the influence of neighboring LEDs, leading to uneven light emission, especially when a large number of LEDs are used.
Innovation Solution
A luminance switching device with a built-in memory unit that stores the luminance value of each LED in each setting state, allowing precise control of light emission by converting detected luminance signals into control signals to adjust the LEDs' luminance independently, preventing uneven light emission.
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 luminance becomes uneven across the lighting lamp
Solution Approach 1:
The patent divides the LED array into multiple independently controllable groups or individual LEDs, allowing each segment to be controlled separately through individual control signals. This segmentation enables precise control of each LED's luminance output, preventing the uneven luminance distribution that occurs when LEDs are simply turned off sequentially in conventional changeover switch operations.
2Quantity of substance
If a large number of LEDs are used in bulbs, then lighting coverage is improved, but luminance uniformity deteriorates due to sequential switching
Solution Approach 1:
The patent applies local quality control by assigning different luminance control characteristics to different regions or individual LEDs within the array. Each LED or group of LEDs can be independently adjusted to achieve optimal luminance distribution across the entire lighting fixture, ensuring uniform illumination even when a large number of LEDs are used.
3Extent of automation
If photo-detectors are used to detect luminance, then luminance control is enabled, but detection accuracy deteriorates due to influence from neighboring LEDs
Solution Approach 1:
The patent extracts or isolates the light signal from each individual LED or group of LEDs, allowing photo-detectors to measure luminance without interference from neighboring LEDs. This can be achieved through optical isolation methods or by controlling LEDs in a sequence that eliminates cross-talk, thereby improving detection accuracy while maintaining automated luminance control.
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
Enables precise multi-stage luminance switching of LED light sources, ensuring consistent light output across multiple LEDs by storing and applying individual luminance values, thus eliminating the issue of uneven luminance caused by neighboring LEDs.
Implementation Method 1
a built-in memory unit, for storing a luminance value of light emitted by each of the LEDs in each setting state
Implementation Method 2
a detecting circuit, electrically connected to the changeover switch, for detecting corresponding switching modes of the changeover switch
Data Source
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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.