Shift Register Node Potential Control for Oxide TFTs
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Solution Overview
Problem
Existing Gate Driver on Array (GOA) technologies face challenges in adapting to the relatively low carrier mobility of oxide thin film transistors, which affects the design of efficient shift registers and gate drive circuits.
Innovation Solution
The proposed solution involves a shift register design that includes an input module, multiple output modules, control modules, and an energy storage module, specifically configured to manage power supply signals and clock signals to optimize node potential control and output waveform characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional GOA circuits are used with oxide thin film transistors, then the fabrication process is simplified and process temperature is reduced, but the carrier mobility is insufficient to support standard circuit operation
Solution Approach 1:
The patent modifies the electrical parameters of the GOA circuit by introducing dual power supply signals (first and second power supply signals) and adjusting voltage levels at critical nodes. The energy storage module stores electrical energy to compensate for the low carrier mobility, enabling the circuit to maintain proper operation despite the limitations of oxide thin film transistors.
2Manufacturing precision
If the number of control modules and energy storage modules is increased to improve output waveform quality, then the output waveform meets specifications, but the device complexity increases
Solution Approach 1:
The patent divides the shift register into functionally independent modules: input module, output module, control modules (first, second, third control modules), and energy storage module. Each module performs a specific function, making the complex circuit more manageable and easier to design. The segmentation allows for systematic optimization of each module to achieve the required output waveform quality.
Solution Approach 2:
The energy storage module acts as an intermediary that mediates between the power supply signals and the output stage. It stores electrical energy and releases it at appropriate times to shape the output waveform, effectively decoupling the requirements of the input stage and output stage, and enabling precise control of the output signal without proportionally increasing overall circuit complexity.
3Loss of time
If dual power supply signals are used to control node potentials, then the rising and falling edge times are shortened, but the power consumption increases
Solution Approach 1:
The patent employs periodic clock signals to control the switching of transistors and the charging/discharging of the energy storage module. The dual power supply signals are applied periodically in synchronization with the clock cycles, enabling rapid edge transitions during active periods while allowing power management during inactive periods. This periodic operation achieves fast switching when needed while controlling average power consumption.
Data Source
AI summary
Disclosed is a shift register, including an input module providing an input signal at an input signal end for a second node, a first output module, a second output module, a first control module, a second control module, a third control module, a fourth control module, and an energy storage module, wherein controlled by a voltage at the second node, the first output module providing a first power supply signal at a first power supply signal end for an output signal end, and, controlled by a voltage at a first node, the second output module providing a second power supply signal at a second power supply signal end for the output signal end. The first control module, the second control module, the third control module, the fourth control module and the energy storage module control potentials at the first node, a third node and a fourth node in cooperation.