Layered Display Structure for Integrated Eye Tracking
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Solution Overview
Problem
Existing head-mounted electronic devices with eye tracking functionality face challenges in reducing size while maintaining high-quality image display and clear image capture, due to the integration of light-receiving and light-emitting elements with optical lenses.
Innovation Solution
A display apparatus with a layered structure, where a light-emitting device is provided in a second layer over a first layer containing pixel circuits, and light-receiving regions with light-receiving devices are placed around the display region, overlapping with optical lenses to enable both high-quality image display and clear image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate optical sensor is added for eye tracking, then eye tracking function is achieved, but device size increases
Solution Approach 1:
The patent combines the light-receiving element for eye tracking with the light-emitting element in the display apparatus into a single integrated structure. The light-receiving element is positioned in the same substrate as the light-emitting element, allowing both display and eye tracking functions to be achieved without adding separate optical sensors, thus preventing device size increase.
2Measurement precision
If an optical lens is provided between eyeballs and display apparatus for clear image capturing, then image capture quality improves, but light from light-emitting element is blocked
Solution Approach 1:
The patent applies different optical properties to different regions of the display apparatus. The region corresponding to the light-receiving element has an optical lens for clear image capturing, while the region corresponding to the light-emitting element maintains high transparency to ensure display brightness. This localized differentiation allows both clear image capture and high-quality display without mutual interference.
Solution Approach 2:
The patent divides the display apparatus into distinct functional regions: a display region with light-emitting elements for image display, and a light-receiving region with light-receiving elements for eye tracking. Each region is optimized independently, with the light-receiving region having optical lenses for clear imaging while the display region maintains high brightness, avoiding the conflict that would arise from a unified structure.
3Volume of moving object
If light-receiving element and light-emitting element are integrated in the same display apparatus, then device size is reduced, but optical lens blocks light from light-emitting element
Solution Approach 1:
The patent implements local quality differentiation where the optical lens is selectively positioned only in the light-receiving region, not in the display region. This allows the integrated structure to maintain small size while ensuring that light from the light-emitting element is not blocked, as the lens is transparent or absent in the display area where brightness is critical.
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 proposed solution allows for a reduction in the size of the display apparatus while achieving both high-quality image display and clear image capture, addressing the size and functionality challenges of existing devices.
Implementation Method 1
a head-mounted electronic device that performs eye tracking utilizing an image obtained using light that is emitted from an infrared ray light source and reflected by a cornea
Implementation Method 2
an optical lens or the like is preferably provided between eyeballs and the display apparatus to obtain a clear image of the eyeballs
Data Source
AI summary
A novel display apparatus is provided. The display apparatus includes a first layer including a plurality of pixel circuits, a second layer provided over the first layer, a plurality of optical lenses provided over the second layer, a display region, and a plurality of light-receiving regions. The display region includes a first pixel circuit provided in the first layer and a light-emitting device provided in the second layer. The light-receiving region includes a second pixel circuit provided in the first layer and a light-receiving device provided in the second layer. The plurality of light-receiving regions are provided around the display region. The optical lens is provided at a position overlapping with the light-receiving region.