Micro Display Device with Zone-Specific Transistor Characteristics
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Solution Overview
Problem
Current display devices are not suitable for small form factor applications such as virtual and augmented reality devices, lacking in both driving ability and display performance due to their structure, which is not optimized for such electronic devices.
Innovation Solution
A micro display device and display integrated circuit where a pixel array and driver circuits are all disposed on a silicon substrate, with transistors in the pixel array zone and circuit zone having different current-voltage transmission characteristics, allowing for a multi-transistor structure that enhances display performance and driving ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transistors and driver circuits are mounted on separate substrates (glass plate and printed circuit), then manufacturing is easier and device structure is simpler, but device size is larger and driving ability is insufficient for small display applications
Solution Approach 1:
The patent merges the pixel array and driver circuits onto a single silicon substrate, eliminating the need for separate glass plate and printed circuit mounting. This integration significantly reduces device size while maintaining manufacturing feasibility through standardized silicon fabrication processes, directly resolving the contradiction between ease of manufacture and device size.
Solution Approach 2:
The patent transitions from a three-substrate assembly (glass plate, printed circuit, and display panel) to a single-planar silicon substrate structure. This dimensional simplification reduces the overall device volume and eliminates the need for complex inter-substrate connections, effectively addressing the size reduction requirement for small display devices.
2Device complexity
If transistors in pixel array zone and circuit zone have the same current-voltage transmission characteristics, then device structure is simpler, but display performance and gradation expression are insufficient
Solution Approach 1:
The patent applies different current-voltage transmission characteristics to transistors in different zones: the pixel array zone uses transistors with lower current transmission capability for precise gradation control, while the circuit zone uses transistors with higher current transmission capability for efficient signal processing. This local differentiation optimizes display performance without requiring complete structural redesign across the entire device.
Solution Approach 2:
The patent modifies transistor parameters (channel width, channel length, doping concentration) to create distinct current-voltage transmission characteristics for different zones. By adjusting these physical parameters, the patent achieves optimized display performance and driving ability while maintaining a unified transistor structure type, thus balancing device complexity and manufacturing precision.
3Device complexity
If all transistors have the same current-voltage transmission characteristics, then device structure is simpler, but driving ability and control precision are insufficient for small display devices
Solution Approach 1:
The patent implements zone-specific transistor characteristics: pixel array zone transistors are optimized for precise current control with lower transmission capability, while circuit zone transistors are optimized for high-speed signal processing with higher transmission capability. This local quality differentiation enhances driving ability and control precision without significantly increasing overall device complexity.
Data Source
AI summary
A micro display device and a display integrated circuit are provided. Embodiments of the micro display device includes: a silicon substrate; a pixel array including a plurality of sub-pixels arranged in a pixel array zone of the silicon substrate; and driver circuits positioned in a circuit zone disposed around the pixel array zone of the silicon substrate, in which all or some of transistors in the pixel array zone and transistors in the circuit zone have different current-voltage transmission characteristics, thereby having excellent driving performance and display performance.