Shift Register De-noising Transistor Bias Control
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Solution Overview
Problem
Conventional shift register circuits in liquid crystal display manufacturing have a long bias voltage application time on de-noising thin film transistors, which reduces the operational lifespan due to a 50% duty cycle, affecting the circuit's reliability and stability.
Innovation Solution
A shift register unit configuration with specific transistor and capacitor connections, including a de-noising control model that switches on de-noising transistors only when noise is present, reducing bias voltage application time and slowing down threshold voltage shifting, thereby enhancing operational reliability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If de-noising transistors are continuously biased in conventional shift register circuits, then noise voltage can be suppressed, but the operational lifespan is reduced due to prolonged bias voltage application time
Solution Approach 1:
The patent implements periodic action by using a control signal that periodically activates the de-noising transistors only when noise is detected, rather than maintaining continuous bias. The control circuit monitors the noise voltage level and selectively turns on the de-noising transistors (T5 and T6) during noise events, allowing them to remain off during normal operation, thus extending their operational lifespan while still suppressing noise when needed.
Solution Approach 2:
The patent employs feedback mechanisms where the control circuit continuously monitors the noise voltage level at the output node and uses this feedback information to control the activation state of de-noising transistors. When noise voltage exceeds a threshold, the feedback signal activates the de-noising transistors to suppress the noise; when noise is absent, the feedback signal keeps them inactive, optimizing both noise suppression and device longevity.
2Object-affected harmful factors
If de-noising transistors are activated continuously, then noise suppression is maintained, but the duty cycle becomes 50% which adversely affects operational lifespan
Solution Approach 1:
The control circuit implements periodic activation of de-noising transistors based on noise detection, ensuring they operate only during necessary intervals rather than continuously. This reduces the duty cycle from 50% continuous operation to intermittent operation triggered only by noise events, thereby extending the duration of transistor life while maintaining effective noise suppression when required.
Solution Approach 2:
The patent introduces dynamic control of the de-noising transistors through a control signal that adjusts their activation state in real-time based on noise conditions. Instead of static continuous bias, the transistors dynamically switch between on and off states, adapting to actual noise levels and reducing overall bias voltage application time while maintaining noise suppression capability.
3Duration of action of stationary object
If a de-noising control model is added to selectively activate transistors, then operational lifespan is extended, but device complexity increases
Solution Approach 1:
The control circuit performs multiple functions: it monitors noise voltage levels, determines when de-noising is required, and activates the appropriate transistors. By making the control circuit multi-functional, the patent avoids adding separate dedicated circuits for each function, thereby limiting the increase in overall device complexity while achieving selective transistor activation to extend operational lifespan.
Solution Approach 2:
The patent merges the control functions for multiple transistors into a single integrated control circuit that manages both T5 and T6 based on a unified noise detection mechanism. This consolidation approach reduces the complexity that would result from having separate control circuits for each transistor, while still achieving the goal of selective activation to extend operational lifespan.
Data Source
AI summary
The present invention provides a shift register unit, a shift register circuit, an array substrate and a display device, and relates to the area of display manufacturing. The time of the bias working on the de-noising transistor can be reduced without affecting the circuit stability, so that the operational lifespan of the device can be extended. A shift register comprises: a capacitor, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a de-noising control model. The present invention is used for manufacturing displays.