Stacked Display Memory Architecture for Compact High Resolution
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Solution Overview
Problem
Existing display apparatuses for xR technologies face challenges in achieving downsizing, low power consumption, high resolution, high color reproducibility, high emission luminance, and reliability, while also requiring multifunctionality.
Innovation Solution
A display apparatus is designed with multiple layers, including a functional circuit layer with Si transistors and a display unit layer with OS transistors, incorporating memory cells and light-emitting elements, allowing for stacked integration of memory units and display units, and utilizing OS transistors with low off-state current for long-term data retention and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If display apparatus size is reduced for xR applications, then portability is improved, but integration density and resolution are worsened
Solution Approach 1:
The patent implements stacked integration by placing the memory unit in a lower layer and the display unit in an upper layer, utilizing the vertical dimension to increase integration density. This allows high-resolution display functionality while maintaining a compact overall apparatus size, directly resolving the contradiction between miniaturization and resolution requirements for xR applications.
2Ease of manufacture
If conventional display structures are used, then manufacturing simplicity is maintained, but power consumption increases
Solution Approach 1:
The patent merges the memory unit and display unit into a single integrated structure with shared transistor layers. The memory unit utilizes the same transistor infrastructure as the display unit, eliminating the need for separate memory circuits and reducing overall power consumption while maintaining manufacturing feasibility through combined process flows.
3Adaptability or versatility
If multiple functional circuits are integrated, then device versatility is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the functional circuits into distinct units: a memory unit for data storage and a display unit for visual output. Each unit can be independently designed, manufactured, and controlled, which manages circuit complexity while enabling multifunctionality. The segmented architecture allows flexible configuration for different xR applications without overwhelming complexity.
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 enables a downsized, high-resolution display apparatus with high emission luminance, improved color reproducibility, and enhanced reliability, while reducing power consumption and circuit complexity.
Implementation Method 1
By applying voltage to this element, light emission can be obtained from the light-emitting organic compound
Data Source
AI summary
A novel display apparatus is provided. The display apparatus includes a first layer and a second layer over the first layer. The first layer includes a functional circuit. The second layer includes a display unit including a plurality of pixels and a memory unit including a plurality of memory cells. Each of the plurality of pixels includes a pixel circuit and a light-emitting element over the pixel circuit. The functional circuit includes a display unit driver circuit and a control circuit. The memory unit has a function of storing image data that is to be output through the display unit driver circuit to the display unit. The memory cell includes a first transistor for retaining a potential corresponding to the image data, and a second transistor for reading the potential. The first transistor is provided in the second layer, and the second transistor is provided in the first layer.