Series-Connected Pixel Circuit for Higher-Luminance Micro-LED Displays
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Solution Overview
Problem
Micro-LED and mini-LED displays face challenges in power consumption efficiency, which affects their luminance and operational efficiency, particularly as the size of LEDs shrinks and requires additional devices to balance power consumption ratios.
Innovation Solution
A subpixel unit with a thin film circuit unit and a light emitting device where multiple light-emitting elements are connected in series, ensuring a total voltage of at least one-third of the saturation voltage of the driving device, eliminating the need for additional devices to balance power consumption and increasing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple light-emitting elements are connected in series with a total voltage of at least one-third of the saturation voltage of the driving device, then power efficiency is improved and luminance is increased, but device complexity increases due to the series configuration
Solution Approach 1:
The light emitting device is segmented into multiple light-emitting elements connected in series. Each element contributes a portion of the total voltage drop, ensuring that the combined voltage is at least one-third of the saturation voltage of the driving device. This segmentation allows for better power efficiency by distributing the voltage load across multiple elements rather than using a single element, thereby reducing unnecessary power loss while maintaining the required luminance output.
2Loss of energy
If additional devices are added to balance power consumption ratios in micro-LED displays, then power consumption is balanced, but device complexity and power loss increase
Solution Approach 1:
The invention extracts and eliminates the need for additional balancing devices by directly configuring the light emitting device with multiple series-connected elements. This configuration inherently balances the power consumption ratio between the light emitting device and the driving device, removing the requirement for extra components that would otherwise be needed to achieve power balance. The series connection of multiple elements naturally distributes the voltage and current, achieving efficient power utilization without adding complexity.
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 configuration enhances the power efficiency and luminance of micro-LED and mini-LED displays by reducing unnecessary power loss across series resistors, allowing for more efficient operation and increased luminance without additional balancing devices.
Implementation Method 1
The first light emitting device includes a plurality of first light-emitting elements connected in series and connected to the second terminal
Data Source
AI summary
A pixel unit includes a thin film circuit unit and a light emitting device. The thin film circuit unit includes a first driving device having a first terminal, a second terminal, and a control terminal. The first terminal can receive a first signal. The control terminal can receive a second signal to control on/off of the first driving device for allowing the first signal transmitted to the second terminal. The light emitting device includes a plurality of light-emitting elements connected in series and connected to the second terminal, wherein a total voltage of the plurality of light-emitting elements is not less than 1/3 of a saturation voltage of the first driving device.