Integrated LED and Photosensor Layout for Precise Brightness Control
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Solution Overview
Problem
Conventional light-emitting diode (LED) control circuits face challenges in accurately stabilizing brightness due to difficulties in precisely controlling the distance and relative position between external photo detectors and LEDs, leading to weakened calibration and brightness control.
Innovation Solution
Integration of a photosensitive element on the same substrate as the LED die, allowing for direct detection of side-emitted light beams without external noise, with a micro control circuit to process signals and adjust luminance, ensuring precise brightness control and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an additional photo detector is installed outside the light-emitting diode to detect brightness, then the brightness detection function is achieved, but the distance and relative position control between the photo detector and light-emitting diode becomes difficult to precisely control
Solution Approach 1:
The patent integrates the photosensitive element directly onto the substrate with the light-emitting diode, merging the light emission and detection functions into a single integrated structure. This eliminates the need for separate external photo detectors and enables precise control of the relative position and distance between the light source and detector, thereby resolving the technical contradiction between achieving brightness detection accuracy and avoiding complex separate installation.
2Ease of operation
If external photo detectors are used to detect light-emitting diode brightness, then brightness control is achieved, but the calibration procedure becomes weakened due to imprecise positioning
Solution Approach 1:
By combining the photosensitive element and light-emitting diode on the same substrate, the patent ensures precise and reproducible relative positioning during manufacturing. This integrated approach strengthens the calibration procedure by eliminating positioning variability associated with separate external detectors, thereby simultaneously improving ease of brightness control and manufacturing precision.
3Manufacturing precision
If a photosensitive element is integrated on the same substrate as the LED die, then the distance and relative position are precisely controlled, but additional integration complexity is introduced
Solution Approach 1:
The substrate serves multiple functions: it acts as both the mounting platform for the light-emitting diode and the photosensitive element, and as the structural element that defines their precise relative positioning. This multi-functional use of the substrate simplifies the overall integration process while maintaining precise distance and position control, resolving the contradiction between manufacturing precision and integration complexity.
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 enhances the accuracy of brightness detection and stabilization by eliminating external noise and allowing for precise control of the LED's luminous intensity, improving the overall performance and reliability of the light-emitting device.
Implementation Method 1
The first photosensitive element receives an effective light beam emitted by the light-emitting-diode die through the photosensitive surface to generate a first detection result
Data Source
AI summary
A light-emitting device with a sensing function is provided. The light-emitting device includes a substrate, a first light-emitting-diode die, and a first photosensitive element. The first light-emitting-diode die is disposed on the substrate and includes a main light-emitting top surface and a side light-emitting surface surrounding the main light-emitting top surface. The first photosensitive element is disposed on the substrate and includes a photosensitive surface. The photosensitive surface is parallel to the main light-emitting top surface. A distance between the main light-emitting top surface and the substrate is greater than a distance between the photosensitive surface and the substrate distance.