Shift Register Charge Holding Node Potential Stability
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Solution Overview
Problem
Conventional shift registers for liquid crystal display devices with integrated touch panels face challenges in extending the suspension period for scanning suspension due to charge leakage, limiting versatility and complicating manufacturing processes, as they cannot maintain a stable potential at the charge holding node during extended suspension periods.
Innovation Solution
A shift register with identical unit circuit configurations across all stages, incorporating a charge supply unit that maintains the charge holding node at a sufficient potential throughout the suspension period by supplying electric charge from a charge supply control node, ensuring normal restart of scanning after the suspension period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the suspension period is extended to improve touch panel processing capability, then the touch panel sensitivity and processing quality are improved, but the charge holding node potential decreases due to charge leakage at thin film transistors
Solution Approach 1:
The patent applies preliminary action by pre-charging the first node N1 to a high level before the suspension period begins. This pre-charging ensures that even when charge leakage occurs during the extended suspension period, the node maintains sufficient potential to enable normal scanning restart after suspension.
Solution Approach 2:
The patent introduces a second node N2 that copies the potential state of the first node N1. The second node serves as a backup charge holding mechanism, ensuring that if the first node experiences charge leakage during suspension, the system can still maintain the necessary potential state through the second node, thereby resolving the reliability issue while allowing extended suspension periods.
2Adaptability or versatility
If different unit circuit configurations are used to enable suspension at specific positions, then scanning suspension capability is improved, but device complexity and manufacturing inspection difficulty increase
Solution Approach 1:
The patent implements universality by designing all unit circuits with the same configuration, where each unit circuit includes both a first node N1 and a second node N2 with identical circuit structures. This uniform design allows any unit circuit to function as a suspension point, eliminating the need for different configurations at different positions while maintaining scanning suspension capability throughout the entire circuit.
Solution Approach 2:
The patent applies segmentation by dividing the charge holding function into two separate nodes (first node N1 and second node N2) within each unit circuit. This segmentation allows the system to distribute the charge holding responsibility across multiple identical modules, enabling suspension capability at any position without requiring different overall circuit configurations.
3Duration of action of moving object
If the suspension period is extended to allow touch panel processing, then processing quality is improved, but charge leakage at thin film transistors reduces the first node potential below the threshold for normal operation
Solution Approach 1:
The patent applies preliminary action by pre-charging the first node N1 to a high level before suspension begins and by designing the second node N2 to be charged at the same timing. This dual pre-charging strategy ensures that even during extended suspension periods with charge leakage, at least one node maintains sufficient potential to trigger the output signal Q when scanning resumes.
Solution Approach 2:
The patent introduces the second node N2 as an intermediary charge holding mechanism that mediates between the first node N1 and the output signal Q. When the first node experiences charge leakage during suspension, the second node serves as a backup intermediary that can still provide sufficient potential to activate the output signal, ensuring reliable scanning restart after extended suspension periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables scanning suspension at any stage without compromising pattern inspection in manufacturing, maintaining the charge holding node's potential and ensuring normal scanning restart, even with extended suspension periods.
Implementation Method 1
a charge holding node configured to hold an electric charge in order to output an output signal at on level
Data Source
AI summary
Each unit circuit that constitutes each of stages of a shift register is provided with a charge supply unit including a third node whose potential becomes high level at identical timing with a first node (a node for holding an electric charge in order to output a scanning signal (output signal) at high level), and capable of supplying an electric charge to the first node throughout a period after the potential of the third node becomes high level until the scanning signal (output signal) at high level is outputted. Here, all of the unit circuits within the shift register have an identical configuration.