Scanning Driving Circuit Stability and Power Management
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Solution Overview
Problem
Conventional scanning driving circuits in flat display devices are prone to instability and increased power consumption due to non-normal disturbances from controlled clock signals, affecting the normal display and operational stability.
Innovation Solution
A scanning driving circuit design that includes a pull-up maintaining module, control module, output module, forward-backward scanning module, and voltage regulator, utilizing controllable transistors and capacitors to manage clock signals and prevent electrical leakage, ensuring stable operation by controlling pull-up and pull-down control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional scanning driving circuits use controlled clock signals to drive the next level, then the circuit can operate and transmit signals, but non-normal disturbances are inputted to the scanning driving circuit, affecting stability and causing increased power consumption
Solution Approach 1:
The patent applies preliminary anti-action by introducing a pull-up maintaining module that proactively maintains the pull-up control signal node at a high电平 state before disturbances can occur. This preventive mechanism counteracts potential non-normal disturbances from clock signals, ensuring stable operation without requiring excessive power consumption for correction or recovery.
Solution Approach 2:
The patent extracts and isolates the pull-up control signal node maintenance function into a dedicated pull-up maintaining module. This separation allows the circuit to specifically address the stability issue of the pull-up node without affecting other parts of the scanning driving circuit, thereby improving overall reliability while minimizing additional power consumption to only what is necessary for maintaining this critical node.
2Device complexity
If the pull-up control signal node is not maintained, then the circuit structure can be simpler, but repeated charging occurs leading to increased power consumption and instability
Solution Approach 1:
The patent implements preliminary action by pre-charging and maintaining the pull-up control signal node at a high电平 state through the pull-up maintaining module before any charging operations occur. This ensures that subsequent charging operations do not cause repeated charging of this node, eliminating the power consumption issue while keeping the circuit structure relatively simple.
3Reliability
If clock signals from the next level are used to charge the pull-up control signal node, then the node can be charged, but non-normal disturbances from these signals affect the scanning driving circuit operation
Solution Approach 1:
The patent introduces an intermediary mechanism - the pull-up maintaining module with its dedicated pull-up transistor - that mediates between the clock signals and the pull-up control signal node. This intermediary selectively responds to valid clock signals while filtering out non-normal disturbances, thereby protecting the scanning driving circuit operation without requiring complex signal control mechanisms.
Data Source
AI summary
The present disclosure relates to scanning driving circuit and flat display device. A pull-up maintaining module receives clock signals at the previous level, to charge a pull-up control signal node and pull up a pull-down control signal node; a control module receives pull-up control signals at the previous level and scanning driving signals at the previous level, and control the pull-up maintaining module; an output module connects to the pull-up maintaining module and the control module for outputting the scanning driving signals to scanning lines; the scanning lines transmits the scanning driving signals to pixel cells.