P-type GOA Circuit for Narrow Frame Displays
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Solution Overview
Problem
GOA circuits based on P-type thin film transistors suffer from instability and high power consumption, particularly in the forward-backward scan module, and have a higher number of signal lines, which hinders their adoption in narrow frame designs.
Innovation Solution
A GOA circuit design utilizing cascade-connected GOA unit circuits with forward-backward scan, output, pull-down holding, and pull-down modules, where P-type thin film transistors are controlled by high frequency clock signals to reduce signal lines and power consumption, and enhance stability by employing a two-switch design in the pull-down module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If GOA circuit based on P-type thin film transistor is used, then the circuit structure is simpler and electrical leakage is lower, but the stability is worse and power consumption is higher
Solution Approach 1:
The GOA circuit is divided into multiple stages, with each stage containing independent transistors (T1-T4) and capacitors (C1-C2). This segmentation allows each component to perform its function optimally while reducing the overall impact of individual component failures, thereby improving stability without increasing structural complexity
Solution Approach 2:
The invention changes the operating parameters of the P-type thin film transistors by introducing specific clock signal frequencies and voltage levels. The first and second clock signals operate at different phases and frequencies, optimizing the switching characteristics of the transistors to reduce power consumption and improve stability
2Device complexity
If GOA circuit based on P-type thin film transistor is used, then the circuit structure is simpler, but the power consumption is higher
Solution Approach 1:
The circuit employs periodic clock signals (first clock signal and second clock signal) to control the switching of transistors T1-T4. This periodic switching allows the circuit to operate in efficient cycles, turning components on only when needed and keeping them off during idle periods, thereby reducing overall power consumption while maintaining the simple P-type transistor structure
Solution Approach 2:
The capacitors C1 and C2 are used to maintain voltage levels continuously during the clock cycles, ensuring that the transistors remain in their required states without requiring constant power supply adjustments. This continuous useful action reduces power consumption by eliminating unnecessary switching and maintaining stable operation
3Adaptability or versatility
If forward-backward scan module is used, then the scan capability is enhanced, but the number of signal lines increases
Solution Approach 1:
The same P-type thin film transistors and capacitors are used to perform multiple functions: T1 and T2 handle both forward and backward scanning, while C1 and C2 serve as both storage and timing elements. This multi-functionality enables enhanced scan capability without proportionally increasing the number of signal lines
Solution Approach 2:
The forward scan and backward scan pathways are merged into a single circuit structure where the first and second clock signals coordinate to control the same set of transistors. This merging allows bidirectional scanning capability while sharing common components, thereby avoiding a proportional increase in signal line count
Data Source
AI summary
The present invention provides a GOA circuit based on P-type thin film transistor, comprising a plurality of GOA unit circuits which are cascade connected, and the GOA unit circuit of every stage comprises a forward-backward scan module (100), an output module (200), a pull-down holding module (300) and a pull-down module (400); the GOA unit circuit of the nth stage and the GOA unit circuit of the n+1th stage adjacent thereto are one cycle; the forward-backward scan module (100) employs the first high frequency clock signal (LCK) and the first backward high frequency clock signal (XLCK) to control the forward-backward scan of the P-type thin film transistor. The GOA circuit based on P-type thin film transistor can ease the deterioration of the thin film transistors in the forward-backward scan module, and reduce the circuit power consumption to decrease the number of the signal lines and realize the narrow frame design. Moreover, it can promote the stability of the GOA circuit and ensure the smooth output of the scan signal (G(n)).