Micro LED Pixel Driving Circuit for Gray-Level Power Control
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Solution Overview
Problem
The power utilization rate of micro LEDs in micro LED display panels is low due to the high drain-source voltage required by driving transistors, resulting in inefficient power consumption and limited luminous efficiency and gray levels.
Innovation Solution
A pixel driving circuit with a switch unit, driving unit, and selection unit controls the number and brightness of micro LEDs connected in series, using selection signals and data signals to optimize power distribution and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the drain-source voltage of driving transistors is increased to maintain saturation region, then the driving capability is improved, but the power consumption increases and power utilization rate decreases
Solution Approach 1:
The patent segments the light-emitting function by dividing a single micro LED into multiple sub-pixels (first micro LED, second micro LED, third micro LED) that can be independently controlled. This allows the driving circuit to activate only the necessary number of sub-pixels based on the gray level requirement, reducing the overall current demand and power consumption while maintaining adequate driving capability for each active sub-pixel.
Solution Approach 2:
The patent implements dynamic control of the light-emitting unit by using a selection unit with multiple selection transistors that can dynamically adjust which sub-pixels are activated based on the data signal gray level. This dynamic segmentation allows the system to optimize power consumption by activating only the required number of sub-pixels for each display gray level, rather than maintaining full power for all sub-pixels continuously.
2Illumination intensity
If more micro LEDs are connected in series to increase brightness, then the luminous efficiency is improved, but the required voltage increases and complicates the driving circuit
Solution Approach 1:
The patent segments the light-emitting function by dividing a single micro LED into multiple sub-pixels (first micro LED, second micro LED, third micro LED) that can be independently controlled. This allows the driving circuit to activate only the necessary number of sub-pixels based on the gray level requirement, reducing the overall current demand and power consumption while maintaining adequate driving capability for each active sub-pixel.
Solution Approach 2:
The patent implements dynamic control of the light-emitting unit by using a selection unit with multiple selection transistors that can dynamically adjust which sub-pixels are activated based on the data signal gray level. This dynamic segmentation allows the system to optimize power consumption by activating only the required number of sub-pixels for each display gray level, rather than maintaining full power for all sub-pixels continuously.
3Adaptability or versatility
If the number of micro LEDs in series is increased to achieve more gray levels, then the color expression is enriched, but the power consumption increases
Solution Approach 1:
The patent segments the light-emitting function by dividing a single micro LED into multiple sub-pixels (first micro LED, second micro LED, third micro LED) that can be independently controlled. This allows the driving circuit to activate only the necessary number of sub-pixels based on the gray level requirement, reducing the overall current demand and power consumption while maintaining adequate driving capability for each active sub-pixel.
Solution Approach 2:
The patent implements dynamic control of the light-emitting unit by using a selection unit with multiple selection transistors that can dynamically adjust which sub-pixels are activated based on the data signal gray level. This dynamic segmentation allows the system to optimize power consumption by activating only the required number of sub-pixels for each display gray level, rather than maintaining full power for all sub-pixels continuously.
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 approach increases the power utilization rate of micro LEDs, enhancing luminous efficiency, brightness, and enabling more display gray levels, thereby enriching color expression and increasing color layers in micro LED display panels.
Implementation Method 1
micro light-emitting diode (micro LED or μLED) is one of the most promising technologies
Implementation Method 2
micro LED display device is also a self-luminous device
Data Source
AI summary
A micro LED display panel and a pixel driving circuit thereof. The pixel driving circuit is used for driving a light-emitting unit, which includes a plurality of micro LEDs connected in series. The pixel driving circuit includes a switch unit, a driving unit and a selection unit. The switch unit controls a data signal input according to a scan signal. The driving unit is electrically connected to the switch unit and the light-emitting unit, and is electrically connected to a first voltage. The selection unit receives a selection signal and is electrically connected to a second voltage. The selection unit is electrically connected to the micro LEDs and the driving unit. The number and brightness of the micro LEDs to be turned on are controlled by the selection unit and the driving unit according to the selection signal and the data signal.