LED String Configuration for Uniform Light Emission
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Solution Overview
Problem
Light emitting unevenness occurs between LED strings configured only by ultraviolet light or blue LED chips due to differing synthetic threshold voltages, limiting the effective use of ultraviolet light and luminous efficiency in existing light emitting devices.
Innovation Solution
A light emitting device with LED strings connected in parallel, where the number of ultraviolet light or violet LED chips is equal to the number of blue LED chips in each string, ensuring consistent synthetic threshold voltage and current flow across all strings, thereby preventing light emitting unevenness and enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED strings are configured only by ultraviolet light LED chips or blue LED chips, then the device structure is simple, but light emitting unevenness occurs between LED strings due to differing synthetic threshold voltages
Solution Approach 1:
The patent combines ultraviolet light LED chips and blue LED chips in the same LED string to form a mixed-configuration string. This merging of different LED chip types resolves the technical contradiction by ensuring that all LED strings have the same synthetic threshold voltage (sum of individual chip threshold voltages), thereby preventing light emitting unevenness while maintaining relatively simple device structure.
2Device complexity
If ultraviolet light LED chips are used alone, then the device structure is simple, but luminous efficiency is degraded due to inability to effectively utilize leaked ultraviolet light
Solution Approach 1:
The patent converts the harmful effect of leaked ultraviolet light (which degrades luminous efficiency when unused) into a beneficial effect by combining it with blue LED chips. The blue LED chips have high luminous efficiency and can effectively utilize the leaked ultraviolet light, transforming the energy loss into useful visible light output.
3Loss of energy
If blue LED chips are used alone, then luminous efficiency is high, but the effect of causing white color of clothes to be shown beautifully is not obtained
Solution Approach 1:
The patent creates a multi-functional LED string that simultaneously achieves high luminous efficiency (from blue LED chips) and the aesthetic effect of making white clothes appear beautiful (from ultraviolet light LED chips). This universal design allows the same LED string to fulfill multiple functions that would otherwise require separate devices.
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
This configuration ensures uniform light emitting intensity across all LED strings, improves luminous efficiency, and effectively showcases the white color of clothes by utilizing both ultraviolet and blue LED chips, while allowing for experimental optimization of the number of LED chips.
Implementation Method 1
a light color conversion member which converts ultraviolet rays emitted by the ultraviolet light LED chip into white light
Implementation Method 2
a blue LED chip that emits blue light in a visible range
Data Source
AI summary
A light emitting device includes a plurality of LED strings connected in parallel, wherein: each of the LED strings includes a plurality of LED chips connected in series to each other; in the LED string, ultraviolet light LED chips and blue LED chips or violet LED chips and blue LED chips are connected in series to each other; and the number of the ultraviolet light LED chips or the number of the violet LED chips is the same as the number of the blue LED chips in each of the plurality of LED strings.