Optical Module Light-Receiving Device Positioning for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical modules face challenges in accurately adjusting the intensity of light emitted from semiconductor light-emitting devices, particularly for achieving better color reproduction in display apparatuses, due to issues like optical crosstalk when multiple devices are multiplexed within a single package.
Innovation Solution
The optical module incorporates a light-forming part with a semiconductor light-emitting device, a lens, and a light-receiving device mounted on a single base member, where the light-receiving device is positioned to receive light outside the lens's spot-size conversion region, reducing crosstalk and allowing for precise intensity adjustment of light emitted from multiple devices within a single package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple semiconductor light-emitting devices are multiplexed within a single package, then the apparatus size is reduced, but optical crosstalk occurs between devices
Solution Approach 1:
The optical module is divided into independent light-forming parts, with each part containing a semiconductor light-emitting device, a light-receiving device, and a lens. This segmentation isolates the optical paths of multiple devices, preventing optical crosstalk while maintaining a compact single-package structure.
Solution Approach 2:
A light-receiving device is introduced as an intermediary between the semiconductor light-emitting device and the external environment. This intermediary directly receives light from the light-emitting device to enable intensity detection and adjustment, while the lens structure controls light direction to prevent crosstalk with other devices.
2Measurement precision
If a light-receiving device is positioned to directly receive light from a semiconductor light-emitting device, then light intensity measurement accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The light-receiving device and light-emitting device are merged within the same light-forming part on a common substrate. This integration allows the light-receiving device to directly measure light intensity from its corresponding light-emitting device without requiring separate measurement paths, improving accuracy while simplifying the overall structure through functional integration.
3Adaptability or versatility
If optical components such as filters and mirrors are used to separate light, then light intensity adjustment capability is improved, but the device complexity and size increase
Solution Approach 1:
The patent extracts the essential function of light separation and intensity measurement to a dedicated light-forming part for each semiconductor device. By taking out the light-receiving and lens components into separate functional units, the system achieves precise light intensity control without requiring complex filter and mirror assemblies, thereby reducing overall device 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 configuration enables highly accurate adjustment of light intensity, suppressing crosstalk and allowing for precise determination of light emitted from semiconductor devices, thereby improving color reproduction and reducing the size of the apparatus.
Implementation Method 1
a lens mounted on the base member and configured to convert, in terms of spot size, light emitted from the semiconductor light-emitting device
Implementation Method 2
a light-receiving device that is mounted on the base member, that is disposed, in an emission direction of the semiconductor light-emitting device, between the semiconductor light-emitting device and the lens, and that is configured to directly receive light from the semiconductor light-emitting device
Data Source
AI summary
An optical module includes a light-forming part and a protective member. The light-forming part includes a base member; semiconductor light-emitting devices mounted on the base member; lenses mounted on the base member and configured to convert, in terms of spot size, light emitted from the semiconductor light-emitting devices; and light-receiving devices that are mounted on the base member, that are disposed, in the emission directions of the semiconductor light-emitting devices, between the semiconductor light-emitting devices and the lenses, and that are configured to directly receive light from the semiconductor light-emitting devices.