GOA Driving Circuit Stage Transfer for High-Frequency Touch Panels
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Solution Overview
Problem
Designing a Gate-On-Array (GOA) driving circuit for high-frequency touch panels is challenging due to the need for multiple scanning stages and increased complexity, particularly when interrupting the GOA driving process, which complicates the design and increases IC costs.
Innovation Solution
A GOA driving circuit with multiple staged driving units, including input, output, pull-down, and pull-down maintaining modules, utilizing switching transistors and capacitors to manage touch control signals, clock signals, and voltage levels to enable pause or stage transferring, thereby achieving high-frequency touch panel driving while minimizing IC costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple scanning stages are used to achieve high-frequency touch panel driving, then the driving frequency reaches 120 Hz, but the difficulty for designing a GOA driving circuit increases
Solution Approach 1:
The GOA driving circuit is divided into multiple scanning stages (first scanning stage, second scanning stage, etc.), where each stage independently controls specific pixel rows. This segmentation allows the circuit to achieve high-frequency driving by coordinating multiple stages rather than using a single complex scanning mechanism, thereby resolving the contradiction between driving frequency and circuit design difficulty.
Solution Approach 2:
The patent implements dynamic stage switching capability where the GOA driving circuit can flexibly transition between different scanning stages based on touch control signals. The circuit dynamically adjusts which stage is active (first stage, second stage, or both simultaneously), enabling adaptive high-frequency driving while maintaining manageable circuit complexity through controlled dynamic behavior.
2Speed
If the GOA driving process is interrupted to enable pause or stage transferring, then high-frequency touch panel driving is achieved, but the difficulty for designing a GOA driving circuit is increased
Solution Approach 1:
The patent incorporates preliminary stage preparation where the GOA driving circuit pre-configures switching transistors and capacitors in advance for stage transitions. Before interrupting the driving process to transfer between stages, the circuit performs preliminary actions to prepare the next stage's scanning parameters and transistor states, reducing the complexity of real-time control during interruptions while maintaining high-frequency capability.
Solution Approach 2:
The patent uses touch control signals as intermediary control inputs that mediate between the high-frequency driving requirement and the stage interruption need. These intermediary signals coordinate the switching between stages and control the pause/resume operations, simplifying the overall design by providing a clear control interface rather than requiring complex internal state management during interruptions.
3Ease of manufacture
If a simplified circuit structure is used to reduce IC costs, then IC cost is saved, but the ability to achieve high-frequency driving with pause or stage transferring may be compromised
Solution Approach 1:
The patent designs universal switching transistor structures and capacitor configurations that serve multiple functions: they enable high-frequency driving, support pause operations, facilitate stage transfers, and maintain touch control signal responsiveness. By making these circuit elements multi-functional rather than dedicating separate components to each function, the circuit achieves adaptability while using a simplified structure that reduces IC cost.
Solution Approach 2:
The patent achieves versatility through parameter changes in the existing circuit components rather than adding structural complexity. By dynamically adjusting parameters such as transistor switching timing, capacitor charging/discharging rates, and voltage levels based on touch control signals, the simplified circuit structure can adapt to different operating modes (high-frequency driving, pause, stage transferring) without requiring additional components, thereby maintaining both cost-effectiveness and adaptability.
Data Source
AI summary
A display device, a TFT substrate and a GOA driving circuit are disclosed. An driving unit of the GOA driving circuit includes an input module for outputting a first control signal according to the signals received; an output module for outputting a first output control signal according to a first control signal and a first clock signal; a pull-down module for outputting a pull-down signal according to the first control signal, a second clock signal and a low voltage level signal; and a pull-down maintaining module for outputting a second output control signal according to the pull-down signal, a high voltage level signal and the first clock signal. The first output control signal and the second output control signal act commonly in order to obtain an output signal. The GOA driving circuit can perform a pause or a stage transferring.