Stacked Driver Circuit Display Layout for High Pixel Density
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Solution Overview
Problem
Display devices with a short distance between the display surface and the user, such as head-mounted displays (HMDs) and electronic viewfinders, suffer from pixel visibility, leading to a decreased sense of immersion and realism due to granularity, requiring high pixel density and resolution to mitigate this issue.
Innovation Solution
A display device design where a first layer includes a gate driver circuit and a source driver circuit, overlapping with a second layer containing a display portion, allowing for a narrower frame and higher pixel density, achieved by stacking these circuits to overlap with the display area, thereby enabling higher resolution and faster operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the display device is positioned close to the user (short distance), then the sense of immersion and realism is improved, but pixel visibility and granularity increase
Solution Approach 1:
The patent transitions from a planar arrangement of driver circuits to a three-dimensional stacked configuration where the gate driver circuit and source driver circuit are positioned in different layers. This vertical stacking enables the display portion to occupy a larger area closer to the user while maintaining high pixel density, thereby reducing pixel visibility and granularity without increasing the display-device-to-user distance.
2Manufacturing precision
If the pixel density is increased to reduce granularity, then the display quality is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The driver circuits are segmented into separate functional blocks: the gate driver circuit in one layer and the source driver circuit in another layer. This segmentation allows each circuit to be optimized independently and simplifies the overall manufacturing process by enabling modular fabrication and assembly, thus achieving high pixel density without proportionally increasing device complexity.
Solution Approach 2:
By stacking the driver circuits vertically in different layers rather than arranging them horizontally, the patent reduces the planar area occupied by the driver circuits. This dimensional transition allows for higher pixel density in the display portion while keeping the overall device footprint manageable and simplifying the routing and interconnection complexity.
3Device complexity
If the driver circuits are arranged in the same layer as the display portion, then the device structure is simplified, but the frame width increases
Solution Approach 1:
The patent positions the gate driver circuit and source driver circuit in different layers relative to the display portion, utilizing the vertical dimension to reduce the horizontal space required for circuit arrangement. This layered configuration allows the frame width to be minimized while maintaining a relatively simple overall device structure, as the circuits are still functionally integrated rather than completely separated.
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 provides a high-definition, high-resolution display with reduced graininess, capable of displaying highly realistic images at high speed and low power consumption, suitable for applications like VR, AR, and electronic viewfinders, with pixel densities up to 10000 ppi and resolutions of 4K or 5K.
Implementation Method 1
makes field-effect mobility (simply referred to as mobility or μFE in some cases) to be increased by stacking a plurality of oxide semiconductor layers, containing indium and gallium in an oxide semiconductor layer serving as a channel
Implementation Method 2
A metal oxide that can be used for a semiconductor layer can be formed by a sputtering method or the like
Data Source
AI summary
A high-definition display device is provided. A small display device is provided. In the display device, a first layer and a second layer are stacked and provided. The first layer includes a gate driver circuit and a source driver circuit, and the second layer includes a display portion. The gate driver circuit and the source driver circuit are provided to include a region overlapping with the display portion. The gate driver circuit and the source driver circuit have an overlap region where they are not strictly separated from each other. Five or more gate driver circuits and five or more source driver circuits can be provided.