Dual-Surface Oxide Pixel Circuits for Thin Head-Mounted Displays
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Solution Overview
Problem
Existing display devices for head-mounted displays face challenges in achieving high-resolution images while maintaining a thin form factor and reducing manufacturing costs.
Innovation Solution
A display device with a substrate having a first and second display layer on opposite surfaces, where the first pixel circuit includes five transistors and the second pixel circuit includes eight transistors, both using oxide semiconductor material for reduced power consumption and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution display is implemented using OLEDoS, then image resolution is improved, but device thickness increases
Solution Approach 1:
The display device is segmented into multiple independent display layers (first display layer, second display layer, etc.), each with its own pixel circuits. This allows the overall high-resolution display to be achieved through composition of multiple layers rather than requiring a single thick high-resolution layer, thereby maintaining thin profile while achieving high resolution.
Solution Approach 2:
The patent transitions from a single-plane display structure to a multi-layer stacked structure along the thickness dimension. By arranging display layers at different positions along the Z-axis (thickness direction), the patent achieves high resolution through spatial multiplication rather than increasing the complexity of a single layer, thus avoiding excessive thickness increase.
2Measurement precision
If more transistors are added to pixel circuits for higher resolution, then image quality is improved, but manufacturing cost increases
Solution Approach 1:
The pixel circuit system is divided across multiple display layers, with each layer containing a subset of transistors (e.g., 5 transistors per pixel in first layer, 8 transistors in second layer). This segmentation allows the total transistor count to be distributed, reducing the complexity and manufacturing cost of each individual layer while maintaining overall high image quality through the combined output of all layers.
3Measurement precision
If multiple display layers are stacked to achieve high resolution, then image resolution is improved, but device complexity increases
Solution Approach 1:
Multiple display layers are merged into a single integrated display device structure, sharing common substrates, encapsulation layers, and manufacturing processes. This merging approach achieves high resolution through layer stacking while avoiding the complexity of completely separate devices, as the layers are fabricated and assembled together in an integrated manner.
Solution Approach 2:
The multiple display layers are designed to perform complementary functions within the same device system, with each layer contributing to the overall high-resolution image output. The uniform design of pixel circuits across layers (using oxide semiconductor transistors) provides multi-functionality, where each layer can operate independently or in combination, reducing design and manufacturing complexity.
Data Source
AI summary
A display device includes: a substrate; a first display layer on a first surface of the substrate; a second display layer on a second surface of the substrate; a first pixel of the first display layer; and a second pixel of the second display layer, wherein the first pixel and the second pixel comprise different numbers of transistors.