Stacked Display Driver Layout for Narrow-Bezel High-PPI Panels
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Solution Overview
Problem
Display devices such as head-mounted displays and electronic viewfinders face challenges with pixel granularity, requiring high pixel density and resolution while maintaining a compact form factor, which is difficult due to the limited space for high-density integration of transistors and driver circuits.
Innovation Solution
A display device architecture with stacked layers, including a gate driver circuit, data driver circuit, and demultiplexer circuit, where the driver circuits overlap the display portion, allowing for higher pixel density and reduced frame size, utilizing metal oxide transistors with In, Ga, Y, or Sn for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to reduce pixel visibility, then image quality and immersion are improved, but frame size increases and layout flexibility decreases
Solution Approach 1:
The patent applies multi-layer stacking to arrange driver circuits and display portions in different vertical layers. The first layer contains driver circuits while the second layer contains display portions, allowing horizontal space to be reduced by utilizing the vertical dimension. This enables higher pixel density without proportionally increasing frame size.
Solution Approach 2:
The patent implements overlapping arrangement where driver circuits in the first layer are positioned beneath display portions in the second layer. This nested configuration allows the driver circuits to occupy the same planar footprint as the display, effectively hiding the driver circuit area within the display area and reducing the overall frame size.
2Adaptability or versatility
If driver circuits are integrated in the same layer as display portions, then layout flexibility is improved, but pixel density decreases due to occupied space
Solution Approach 1:
The patent separates driver circuits and display portions into different vertical layers (first layer for drivers, second layer for displays). This dimensional separation allows the display portion to occupy the full planar area without being reduced by driver circuit placement, thereby maximizing pixel density while maintaining layout flexibility through independent circuit design.
3Measurement precision
If pixel density is increased to 1000 ppi or higher, then image realism is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the display device into distinct functional layers: a first layer for driver circuits and a second layer for display portions with pixels arranged in a matrix. This segmentation allows independent optimization and manufacturing of each layer, simplifying the overall manufacturing process while enabling high pixel density in the display layer without requiring the entire device to be manufactured at that precision level.
Data Source
AI summary
A display device with a narrower frame can be provided. In the display device, a first layer, a second layer, and a third layer are provided to be stacked. The first layer includes a gate driver circuit and a data driver circuit, the second layer includes a demultiplexer circuit, and the third layer includes a display portion. In the display portion, pixels are arranged in a matrix, an input terminal of the demultiplexer circuit is electrically connected to the data driver circuit, and an output terminal of the demultiplexer circuit is electrically connected to some of the pixels. The gate driver circuit and the data driver circuit are provided to include a region overlapping some of the pixels. The gate driver circuit and the data driver circuit have a region where they are not strictly separated from each other and overlap each other. Five or more gate driver circuits and five or more data driver circuits can be provided.