Display Panel IR Integration for Lightweight Gaze Tracking
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Solution Overview
Problem
The additional installation of infrared light emitting and sensing elements in head mounted display apparatuses increases weight and volume, compromising wearing comfort.
Innovation Solution
Integrate infrared light emitting diodes and photodiodes within the display panel, utilizing a structure that reflects visible light and transmits infrared rays, with specific thicknesses for electrodes and a dielectric layer to enhance miniaturization and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If infrared light emitting elements and sensing elements are additionally installed in the head mounted display apparatus, then gaze tracking functionality is achieved, but weight and volume increase
Solution Approach 1:
The patent combines infrared light emitting diodes and photodiodes with the display panel by integrating them into the same substrate. The infrared light emitting diode is formed in a first subpixel and the photodiode is formed in a second subpixel of the display panel, merging multiple functions (display and gaze tracking) into a single integrated structure, thereby avoiding additional weight and volume from separate components
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the display device and the gaze tracking device. The same substrate houses both the display pixels and the infrared light emitting/sensing elements, making the display panel a universal component that performs both display and gaze tracking functions
2Adaptability or versatility
If infrared light emitting elements and sensing elements are additionally installed in the head mounted display apparatus, then gaze tracking functionality is achieved, but volume increases
Solution Approach 1:
The patent combines infrared light emitting diodes and photodiodes with the display panel by integrating them into the same substrate. The infrared light emitting diode is formed in a first subpixel and the photodiode is formed in a second subpixel of the display panel, merging multiple functions (display and gaze tracking) into a single integrated structure, thereby avoiding additional volume from separate components
Solution Approach 2:
The infrared light emitting diode and photodiode are nested within the subpixels of the display panel. The infrared light emitting diode is formed in a first subpixel and the photodiode is formed in a second subpixel, effectively nesting the gaze tracking functionality within the existing display structure, thereby minimizing additional volume
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 integration alleviates weight and volume issues, improving user comfort by embedding gaze tracking functionality within the display panel without additional bulk.
Implementation Method 1
a structure configured with the second cathode electrode, the dielectric layer, and the first anode electrode reflects visible light and transmits infrared ray
Implementation Method 2
an infrared light emitting diode which is in the first subpixel on the substrate and in which a second anode electrode, an infrared emitting layer, and a second cathode electrode are stacked
Implementation Method 3
an infrared photodiode positioned below the light emitting diode in the one of the plurality of subpixels, the infrared photodiode receiving the infrared ray
Data Source
AI summary
A display device includes: an infrared light emitting diode in a first subpixel and in which a second anode electrode, an infrared emitting layer, and a second cathode electrode are stacked; a dielectric layer on the infrared light emitting diode; and a light emitting diode in the first subpixel and in which a first anode electrode, a light emitting layer, and a first cathode electrode are stacked on the dielectric layer, wherein a structure configured with the second cathode electrode, the dielectric layer, and the first anode electrode reflects visible light and transmits infrared ray.