Pancake-Lens Display Sensor Integration for Compact Eye Tracking
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Solution Overview
Problem
Wearable devices such as HMDs and AR glasses face challenges in reducing weight and volume while maintaining effective eye-tracking functionality for virtual and augmented reality applications.
Innovation Solution
Optimizing the position of a light-receiving sensor to detect near-infrared light for eye-tracking, integrating it with a display panel, pancake lens, and circuit substrate to control screen resolution based on eye movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the light-receiving sensor is placed in a conventional position on the display panel, then the eye-tracking function can be implemented, but the weight and volume of the wearable device increase
Solution Approach 1:
The light-receiving sensor is merged with the dummy area of the display panel, combining the display function and the eye-tracking sensing function into a single integrated structure. This eliminates the need for separate sensor components and reduces overall device weight and volume while maintaining eye-tracking functionality.
Solution Approach 2:
The dummy area of the display panel is given dual functionality: it serves as both a non-display region of the display panel and as the location for the light-receiving sensor. This multi-functional design reduces the number of separate components needed in the wearable device.
2Volume of stationary object
If the light-receiving sensor is integrated with the display panel, then the volume is reduced, but the sensor placement complexity increases
Solution Approach 1:
By merging the sensor with the dummy area, the patent simplifies the overall device structure. The sensor and display panel become a single integrated component, reducing assembly steps and placement complexity despite the innovative integration approach.
3Area of stationary object
If the light-receiving sensor is positioned at the corner areas of the display panel, then the field of view coverage is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The sensor is merged with the dummy area which is inherently part of the display panel structure. This integration uses the existing dummy area geometry to define sensor placement, reducing the need for additional high-precision positioning steps during manufacturing.
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
Reduces the weight and volume of wearable devices by optimizing sensor placement, enhancing eye-tracking accuracy and screen control for improved user experience.
Implementation Method 1
The wearable device may irradiate near-infrared light having an output wavelength of about 780 nm to about 1400 nm to the user's eyes to track the movement of the user's eyes, and may detect the near-infrared light reflected from the user's eyes.
Implementation Method 2
a pancake lens for controlling a path of a display light outputted from the display panel
Data Source
AI summary
Provided are a display device and a mobile electronic device. A display device includes a display panel, a pancake lens for controlling a path of a display light outputted from the display panel, a light-receiving sensor overlapping a dummy area of the display panel, the dummy area being at an outer edge of a field of view of the pancake lens, a circuit substrate including a driving circuit for driving the display panel and a power circuit, and a light source configured to output near-infrared light to be recognized by the light-receiving sensor.