Scanning Driving Circuit Reducing TFT Count and Power
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Solution Overview
Problem
Existing scanning driving circuits for display panels face challenges in reducing the number of power supplies and thin-film transistors (TFTs), leading to complex circuit designs and increased power consumption.
Innovation Solution
The proposed solution involves a scanning driving circuit configuration using N-type Indium Gallium Zinc Oxide (IGZO) TFTs in pull-up, pull-down control circuits, and scanning output circuits, which reduces the number of power supplies and TFTs, simplifying the circuit and lowering power consumption by optimizing transistor connections and clock signal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional GOA circuits are designed with IGZO TFTs, then the mobility rate and stability are improved, but the circuit complexity and number of power supplies increase
Solution Approach 1:
The patent merges the pull-up control circuit and pull-down control circuit into a unified scanning driving circuit structure. The first controllable transistor (pull-up) and second controllable transistor (pull-down) are integrated with shared control ends and power supply connections, reducing the total number of independent circuits while maintaining IGZO TFT stability advantages.
Solution Approach 2:
The controllable transistors in the patent serve multiple functions: the first controllable transistor acts as both a pull-up device and a switching element, while the second controllable transistor serves as both a pull-down device and a switching element. This multi-functionality reduces the overall number of TFTs needed in the circuit.
2Reliability
If conventional GOA circuits are designed with IGZO TFTs, then the mobility rate and stability are improved, but the power consumption increases
Solution Approach 1:
The patent combines multiple power supply connections into shared voltage nodes. The first and second controllable transistors share common power supply connections and control voltage nodes, reducing the number of independent power supplies from multiple separate sources to a unified power management structure, thereby reducing overall power consumption.
Solution Approach 2:
The scanning driving circuit operates using periodic clock signals to control the switching of controllable transistors. This periodic switching action allows the circuit to maintain functionality with lower average power consumption compared to continuous operation, as transistors are switched on and off in synchronization with the clock cycles.
3Device complexity
If the number of TFTs is reduced, then the circuit is simplified and power consumption is reduced, but the scanning signal output capability must be maintained
Solution Approach 1:
The controllable transistors are designed to perform multiple functions simultaneously: signal switching, level control, and scanning signal generation. This multi-functionality allows the circuit to maintain full scanning signal output capability with fewer TFTs, as each transistor contributes to multiple aspects of signal processing rather than dedicated single functions.
Solution Approach 2:
The scanning driving circuit uses its own internal controllable transistors and clock signals to generate and regulate the scanning signals without requiring external dedicated signal generation circuits. The circuit self-generates the necessary control voltages and switching signals, reducing the need for additional TFTs while maintaining output capability.
Data Source
AI summary
The pull-down control signal point relates to a scanning driving circuit and a display panel. The scanning driving circuit includes a pull-up control circuit configured for pulling up a level of a pull-up control signal point to be a high level or for pulling down the level of the pull-up control signal point to be a low level, a pull-down control circuit configured for pulling down the level of a pull-down control signal point to be the high level or for pulling down the level of the pull-down control signal point to be the low level, and the pull-down control circuit connects to the pull-up control circuit, and a scanning output circuit connects to the pull-up control circuit and the pull-down control circuit, and the scanning output circuit is configured for outputting the scanning driving signals of the high level or of the low level.