Layered Display Device Reducing Wiring Length for VR AR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices for VR and AR applications face challenges in achieving high resolution while minimizing size and weight, due to the complexity of integrating driver circuits and functional circuits with pixel circuits, which increases circuit area and wiring length.
Innovation Solution
A display device structure with distinct layers for driver circuits, functional circuits, and pixel circuits, utilizing silicon transistors for high-speed operation and metal oxide transistors for low off-state current, allowing for a stacked configuration that reduces the bezel width and minimizes wiring length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driver circuits and functional circuits are provided separately from pixel circuits, then control functionality is improved, but the length of wirings increases and device size increases
Solution Approach 1:
The patent applies three-dimensional stacking to arrange pixel circuits, driver circuits, and functional circuits in different layers (first layer, second layer, third layer). This vertical arrangement reduces wiring length by connecting circuits through short vertical interconnects rather than long horizontal wirings, thereby maintaining control functionality while minimizing wiring length and device area.
Solution Approach 2:
The patent implements a nested structure where driver circuits and functional circuits are integrated within the same device footprint as pixel circuits by stacking them in different layers. This nesting approach allows multiple circuit functions to coexist in a compact volume, reducing overall device size while maintaining full control functionality.
2Area of stationary object
If driver circuits and functional circuits are monolithically provided with pixel circuits, then device area is reduced, but circuit complexity increases
Solution Approach 1:
The patent segments the display device into distinct functional layers: pixel circuits in one layer, driver circuits in another layer, and functional circuits in a third layer. This segmentation reduces circuit complexity by organizing functions into separate modules while maintaining compact area through vertical stacking, making the complex device more manageable and manufacturable.
Solution Approach 2:
By transitioning from planar integration to three-dimensional stacking, the patent achieves high circuit integration without proportionally increasing circuit complexity. The vertical arrangement allows dense packing of circuits while maintaining clear functional separation through layering, thus reducing area without overwhelming complexity.
3Manufacturing precision
If high resolution is achieved with large number of pixels, then display quality is improved, but device size increases
Solution Approach 1:
The patent achieves high resolution in a compact size by stacking multiple circuit layers vertically. This three-dimensional architecture allows a large number of pixels to be integrated without proportionally increasing the device footprint, as circuits are arranged in the vertical dimension rather than spreading out horizontally, thereby maintaining high display quality in a small form factor.
Solution Approach 2:
The patent nests driver circuits and functional circuits within the same device volume as pixel circuits through layered stacking. This nested arrangement maximizes the use of three-dimensional space, allowing high-resolution pixel arrays to coexist with necessary control circuits in a compact overall device size.
Data Source
AI summary
A novel display device is provided. The display device includes a first layer, a second layer, and a third layer. The first layer, the second layer, and the third layer are provided in different layers. The first layer includes a driver circuit and a functional circuit. The second layer includes a pixel circuit. The third layer includes a display element. The pixel circuit has a function of controlling light emission of the display element. The driver circuit has a function of controlling the pixel circuit. The functional circuit has a function of controlling the driver circuit. The first layer includes a first transistor with a semiconductor layer containing silicon in a channel formation region. The second layer includes a second transistor with a semiconductor layer containing a metal oxide in a channel formation region.