LED Color Control via Electrical Current Adjustment
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Solution Overview
Problem
Optical color control systems in LED devices increase complexity and manufacturing cost, limit portability, and require a zeroing step, which increases manufacturing time and cost.
Innovation Solution
A light emitting device with a simplified architecture using a combination of first and second LEDs and electrical circuitry to provide adjusted drive current values based on the identity, binning, and operating parameters of the LEDs, allowing for independent control of the LEDs' light output to maintain a defined chromaticity region without the need for optical detection systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical color control systems are used to monitor and correct LED emission color, then color stability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the optical detection components from the system and replaces them with electrical control mechanisms. By removing the optical sensors and feedback loops, the system achieves color control through electrical circuitry that adjusts drive currents based on LED binning data, thereby maintaining color stability while reducing device complexity.
Solution Approach 2:
The patent substitutes the optical-mechanical color detection and correction system with an electrical control system. Instead of using optical sensors to detect color and mechanical feedback loops to adjust emission, the invention uses electrical circuitry to pre-calculate and apply corrected drive currents to LEDs based on their binning characteristics, replacing the optical-mechanical system with a purely electrical control mechanism.
2Manufacturing precision
If optical color control systems are used to maintain constant LED emission color, then color accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies preliminary action by pre-characterizing LEDs during manufacturing through binning processes that categorize LEDs by their emission properties. This preliminary data collection and classification is stored and later used by the electrical control system to apply appropriate current corrections, eliminating the need for expensive post-assembly optical control systems while maintaining color accuracy.
Solution Approach 2:
The patent replaces expensive, complex optical control systems with simpler, cheaper electrical control circuitry. The electrical components used for current adjustment are significantly less costly than optical sensors and their associated control systems, while achieving the same color accuracy goal through a different, more economical approach.
3Reliability
If optical color control systems are used to correct LED emission variations, then color consistency is improved, but manufacturing time increases
Solution Approach 1:
The patent performs all necessary color characterization and control parameter determination during the LED manufacturing and binning process. By completing this preliminary work before assembly, the actual product assembly and testing requires minimal additional time, as the control system simply needs to retrieve pre-calculated values rather than performing real-time optical measurements and adjustments.
4Adaptability or versatility
If optical sensors are added to LED devices for color monitoring, then color control capability is improved, but portability decreases
Solution Approach 1:
The patent extracts and removes the optical sensors and their associated control electronics from the LED device structure. By eliminating these bulky and complex components, the LED devices become more compact and portable while retaining color control capability through the simplified electrical current adjustment method based on pre-stored binning data.
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 solution simplifies the construction and manufacturing of LED devices, reduces costs, and makes them more portable by controlling the color of light emitted without the need for optical detection systems, while maintaining consistent chromaticity across varying operating conditions.
Implementation Method 1
Light emitting diodes (LED or LEDs) are solid state devices that convert electric energy into light
Implementation Method 2
When a forward bias is applied across the doped layers, holes and electrons are injected into the active layer where they recombine to generate light
Data Source
AI summary
The present invention, in one aspect, provides light emitting devices comprising LEDs, the light emitting devices, in some embodiments, having a simplified architecture for controlling the color of emitted light.