Optical Sensing Light Guide Dispersion
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Solution Overview
Problem
Conventional optical sensing systems with light transmissive display screens suffer from light spot phenomena due to concentrated light energy, which requires a larger encapsulating body to prevent this issue, increasing manufacturing costs and limiting design flexibility.
Innovation Solution
An optical sensing system that includes a light guide device with a second light emitting surface, allowing light to be dispersed over a larger area, reducing energy concentration and minimizing the size of the encapsulating body while maintaining effective distance sensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the encapsulating body size is reduced to lower manufacturing cost, then the light emitting surface area decreases, but light energy becomes concentrated causing light spot phenomenon on the display screen
Solution Approach 1:
A light guide device is introduced as an intermediary component between the light emitting element and the display screen. This light guide device receives concentrated light from the small light emitting surface and redistributes it over a larger area, effectively mediating between the small encapsulating body and the display screen to prevent light spot phenomenon while maintaining compact size
Solution Approach 2:
The light guide device transforms the light distribution from a point-source concentration in three-dimensional space to a planar distribution across the display screen surface. By changing the dimensional pattern of light propagation, the system expands light coverage area without increasing the encapsulating body volume
2Object-affected harmful factors
If the encapsulating body size is increased to prevent light spot phenomenon, then light energy can be dispersed, but manufacturing cost increases and design flexibility decreases
Solution Approach 1:
The optical system is segmented into distinct functional components: a compact light emitting element, a light guide device, and a light sensing element. This segmentation allows the light guide device to specifically handle the light distribution function, enabling the encapsulating body to remain small while still achieving uniform light dispersion across the display screen
3Object-affected harmful factors
If the light emitting surface area is increased to disperse light energy, then light spot phenomenon is prevented, but the encapsulating body must be larger increasing manufacturing cost
Solution Approach 1:
The light guide device serves as a mediator that decouples the relationship between light emitting surface area and light distribution area. It receives light from a small emitting surface and transforms it into a wide area illumination, allowing the encapsulating body to remain compact while achieving the effect of large-area light emission
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
The system effectively disperses light energy over a larger area of the light transmissive display screen, preventing light spots and allowing for a smaller encapsulating body size, thereby enhancing design flexibility and reducing manufacturing costs while maintaining accurate distance sensing.
Implementation Method 1
a light is emitted by the light emitting element via the first light emitting surface and is transmitted to the light guide device; the light transmitted to the light guide device is emitted to a to-be-detected object via the second light emitting surface
Implementation Method 2
the reflected light reaches the light sensing element via the light receiving surface, where the light sensing element is configured to receive the reflected light, and perform distance sensing on the to-be-detected object based on an intensity of the reflected light
Data Source
AI summary
An optical sensing system and an electronic display system are provided. In the optical sensing system, a light is firstly transmitted to a light guide device via a first light emitting surface and then is transmitted to a light transmissive display screen via a second light emitting surface on the light guide device, and then the light passes through the light transmissive display screen. In this case, even if an area of the first light emitting surface is small due to the small size of an encapsulating body for a light emitting element, energy of the light is not concentrated at a small region of the light transmissive display screen but is dispersed to a relatively large region of the light transmissive display screen, as long as an area of the second light emitting surface is set to be relatively large.