Gate Driving Circuit for Rolling Micro-LED Scanning and Low Power
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Solution Overview
Problem
Display devices using micro-LEDs face rapid power consumption increases and visible flicker due to the emission duty driving method, which requires simultaneous lighting of all pixel lines, making it difficult to implement low power driving without additional emission lines.
Innovation Solution
A gate driving circuit with a first and second pulse output part, utilizing transistors to control scan signals and carry signals, allowing pixel driving on a rolling basis without additional emission lines, thereby controlling duty cycles and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If emission duty driving method is used to drive all pixel lines simultaneously, then light emission efficiency is improved, but power consumption increases rapidly
Solution Approach 1:
The gate driving circuit is divided into a first pulse output part and a second pulse output part, each independently controlling different pixel lines. This segmentation allows sequential driving of pixel lines instead of simultaneous driving, reducing peak current demand while maintaining overall light emission efficiency
Solution Approach 2:
The circuit dynamically switches between first pulse output and second pulse output based on the scanning sequence. The first pulse output part drives pixel lines during a first time period, then the second pulse output part takes over, creating a dynamic rolling driving pattern that distributes power consumption over time
2Ease of operation
If emission duty driving method is used, then light emission control is improved, but visible flicker occurs
Solution Approach 1:
The gate driving circuit implements periodic action by alternating between first pulse output and second pulse output in a regular scanning sequence. Each pixel line is driven periodically with scan signals, creating consistent refresh intervals that eliminate visible flicker while maintaining duty cycle control
Solution Approach 2:
The circuit transitions dynamically from static simultaneous driving to dynamic sequential driving. The rolling pixel line driving method continuously moves the active driving region through different pixel lines, creating a smooth visual effect without flicker
3Use of energy by moving object
If additional emission lines are added to control duty cycle, then power consumption is reduced, but non-display area increases
Solution Approach 1:
The first and second pulse output parts serve multiple functions: they sequentially drive different pixel lines, provide duty cycle control, and enable rolling driving mode. This multi-functionality eliminates the need for separate emission lines while achieving power consumption reduction
Solution Approach 2:
The patent merges the pulse generation function and the emission control function into a single gate driving circuit. The first and second pulse output parts are integrated to work together in a rolling sequence, combining multiple functions that would traditionally require separate components or lines
4Use of energy by moving object
If rolling pixel line driving is implemented, then power consumption is reduced, but charging rate of pixels decreases
Solution Approach 1:
The gate driving circuit prepares scan signals in advance for each pixel line before activation. The first and second pulse output parts pre-charge and pre-position the scanning sequence, ensuring that when each pixel line is activated, the charging process can proceed at optimal speed without delay
Data Source
AI summary
A gate driving circuit for a display device can include a first pulse output part configured to output a first pulse of a scan signal through an output node, and a second pulse output part configured to output a second pulse of the scan signal through the output node. Also, the first pulse output part includes a first output transistor having a gate electrode connected to a first control node, and a second output transistor having a gate electrode connected to a second control node. Further, the second pulse output part includes a third control node, and a third output transistor connected to the third control node, and the second pulse output part is connected to the second control node and the output node of the first pulse output part.