Eyewear Light-Emitting Layer Layout for Low Near-Infrared Reflection
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Solution Overview
Problem
Existing light emitting devices, particularly in eyewear devices like head-mounted displays, struggle to effectively suppress the reflection of near-infrared rays, which are necessary for eye tracking and pupil positioning.
Innovation Solution
Incorporating a near-infrared absorption layer in both the effective pixel region and the peripheral region of the light emitting device, with a pattern portion in the pixel region to minimize near-infrared reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a selective reflection film is disposed on the viewing side to reflect near infrared rays, then thermal deterioration of the organic light emitting layer is reduced, but near infrared ray reflection is increased
Solution Approach 1:
Instead of reflecting near infrared rays as in conventional selective reflection films, this invention uses a near-infrared absorption layer that absorbs near infrared rays. This inverted approach (absorption vs. reflection) simultaneously achieves thermal protection and suppresses near infrared ray reflection that interferes with eye tracking functions
Solution Approach 2:
The invention changes the optical parameter of the film from reflective to absorptive for near infrared wavelengths. By using a patterned near-infrared absorption layer with specific absorption characteristics, it achieves both thermal management and compatibility with near infrared ray-based eye tracking systems
2Object-affected harmful factors
If a near-infrared absorption layer is provided in the effective pixel region and peripheral region with a pattern portion, then near infrared ray reflection is suppressed, but device complexity is increased
Solution Approach 1:
The near-infrared absorption layer is divided into a patterned structure with different regions (effective pixel region and peripheral region) having different patterns. This segmentation allows selective near infrared absorption where needed while maintaining simplicity in other areas, achieving reflection suppression without excessive complexity
Solution Approach 2:
The patterned near-infrared absorption layer serves multiple functions: it suppresses near infrared reflection in the effective pixel region, provides thermal management, and maintains structural integrity across the entire device. This multi-functionality reduces the need for additional separate components, thereby limiting complexity increase
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 solution effectively reduces near-infrared reflection, enhancing the accuracy of eye tracking and pupil positioning systems while maintaining device luminance.
Implementation Method 1
a near-infrared absorption layer, in which the near-infrared absorption layer is provided in an effective pixel region and a peripheral region located around the effective pixel region
Data Source
AI summary
Provided is a light emitting device capable of suppressing reflection of near infrared rays. The light emitting device includes a near-infrared absorption layer. The near-infrared absorption layer is provided in the effective pixel region and a peripheral region located around the effective pixel region. The near-infrared absorption layer has a pattern portion in the effective pixel region.