Subpixel Group Multi-Rail Layout for Low-Power Compact Displays
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Solution Overview
Problem
High-resolution displays for battery-operated devices face challenges in power consumption and maintaining small dimensions, especially when incorporating power-saving features.
Innovation Solution
The use of multiple power rails tuned for each light emitting diode and a well rail for transistors in the subpixel group increases efficiency and reduces the physical area of the subpixel group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple power rails are used for each light emitting diode to increase efficiency, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The power supply system is segmented into multiple dedicated power rails, with each rail tuned to supply optimal voltage to specific light emitting diodes. This segmentation allows each LED to receive precisely tailored power, improving overall power efficiency while managing complexity through organized modular architecture
Solution Approach 2:
The well rail serves multiple functions by providing bulk voltage to body terminals of drive transistors across the entire subpixel group. This multi-functional approach consolidates what could be numerous individual connections into a single shared rail, reducing device complexity while maintaining efficient power delivery
2Area of stationary object
If the physical area of the subpixel group is reduced for small displays, then display dimensions are minimized, but power-saving features become difficult to incorporate
Solution Approach 1:
Transistors within the subpixel group share common wells and a shared well rail for bulk voltage supply. This merging of previously separate structures reduces the overall physical area required while the efficient power rail architecture ensures power-saving features remain effective in the compact design
Solution Approach 2:
Each light emitting diode receives locally optimized power through dedicated tuned power rails, ensuring that even in a compact subpixel group, each component operates at optimal efficiency. This local quality approach allows power-saving features to be maintained despite reduced overall area
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
This solution enables longer operating life for battery-operated devices by reducing power consumption and maintaining small display dimensions while incorporating power-saving features.
Implementation Method 1
each including a light emitting diode configured to radiate light in one of the component colors
Data Source
AI summary
A high-resolution display that is a small size suitable for mobile applications is disclosed. The display is color and so includes different color subpixels arranged in subpixel groups. To minimize power consumption, each subpixel includes its own power rail supplying the subpixel with a rail voltage that is based on a forward voltage of a corresponding light emitting diode. To minimize the area of the subpixel group, transistors of the subpixels are fabricated within a common well and the body terminals of the transistors are connected to a common well rail that is separate from the power rails.