LTPO Gate Driving Circuit for Low-Frequency Display Power Reduction
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Solution Overview
Problem
Current display technologies face challenges in reducing power consumption, particularly in low-frequency display modes, as they require higher driving frequencies to maintain image stability, leading to increased power usage.
Innovation Solution
The implementation of a display substrate with a gate driving circuit based on Low Temperature Polycrystalline Oxide (LTPO) technology, which incorporates oxide transistors and polysilicon transistors to manage clock signals and voltage levels efficiently, allowing for reduced power consumption by optimizing the phase of clock signals and using oxide transistors with low leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If higher driving frequencies are used to maintain image stability, then image stability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic refresh rate adjustment by configuring the gate driving circuit to operate at different frequencies based on display content requirements. The circuit can switch between high-frequency mode for moving images and low-frequency mode for static images, optimizing the balance between image stability and power consumption in real-time
Solution Approach 2:
The patent changes the operating frequency parameter of the gate driving circuit from a fixed high value to a variable value that can be adjusted between high and low states. This parameter change enables the system to maintain image stability when needed while reducing power consumption during static display periods
2Use of energy by moving object
If LTPS TFT technology is used to achieve lower driving current and voltage, then power consumption is reduced, but manufacturing complexity increases due to low-temperature polysilicon process
Solution Approach 1:
The patent employs a hybrid transistor architecture combining LTPS TFTs for high-performance switching functions and oxide TFTs for low-leakage current functions. This composite approach leverages the advantages of both material systems to achieve low power consumption while managing manufacturing complexity through specialized process integration
3Use of energy by moving object
If oxide TFT technology is used to achieve lower leakage current, then power consumption is reduced, but refresh rate decreases
Solution Approach 1:
The patent applies different transistor types in different functional locations within the gate driving circuit. Oxide TFTs are strategically placed in positions where low leakage current is critical for power savings, while LTPS TFTs are used in positions requiring high-speed operation for maintaining refresh rate, achieving localized optimization of circuit performance
Data Source
AI summary
A display substrate and a manufacturing method thereof, and a display device are provided. The display substrate includes a gate driving circuit including shift register units and clock signal lines including a first clock signal line, a second clock signal line providing a second clock signal, and a third clock signal line providing a third clock signal. An input circuit of a n-th stage shift register unit in the shift register units is connected with the first clock signal line, a first control circuit of the n-th stage shift register unit is connected with the first clock signal line, the second clock signal line, and the third clock signal line, a second control circuit of the n-th stage shift register unit is connected with the second clock signal line, and a phase of the second clock signal is opposite to a phase of the third clock signal.