Scanning Driving Circuit for LCDs with Reduced Power and Border Width
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Solution Overview
Problem
Current scanning driving circuits for LCDs are complex and consume high power, leading to increased border width due to the need for multiple pull-down maintaining modules and complex configurations.
Innovation Solution
A scanning driving circuit design featuring alternately arranged first and second driving circuits with pull-up and pull-down modules, controlled by transistors and reference voltage connections, which reduce power consumption and simplify the circuit structure by using controllable transistors to manage scanning line states during operating and non-operating periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TFT-LCD array manufacturing process is used to manufacture scanning driving circuit, then the circuit can scan rows, but the circuit becomes complicated and power consumption increases
Solution Approach 1:
The patent extracts and eliminates the redundant pull-down maintaining module from the conventional scanning driving circuit. By removing this unnecessary component, the circuit structure is simplified while maintaining the turn-off state stability through alternative means (using the pull-up module and controlling module in combination with the first controllable transistor to achieve the maintaining function), thereby reducing complexity without sacrificing reliability
Solution Approach 2:
The patent makes the pull-up module serve multiple functions: it not only performs the pull-up operation but also contributes to maintaining the turn-off state when working in conjunction with the first controllable transistor. This multi-functionality reduces the need for separate dedicated maintaining modules, simplifying the overall circuit structure while ensuring stable operation
2Reliability
If pull-down maintaining module is added to maintain turn-off state, then circuit stability is improved, but power consumption increases
Solution Approach 1:
The patent removes the separate pull-down maintaining module that would continuously consume power to maintain the turn-off state. Instead, it uses a dynamic approach where the pull-up module and first controllable transistor work together to achieve the maintaining function only when needed, eliminating continuous power consumption associated with dedicated maintaining modules
Solution Approach 2:
The patent implements periodic control where the first controllable transistor is activated only during specific periods (when scanning signals are outputted) to maintain the turn-off state, rather than using a continuously operating pull-down maintaining module. This periodic action significantly reduces power consumption while maintaining circuit stability during critical operations
3Reliability
If multiple pull-down maintaining modules are used, then circuit stability is improved, but LCD border width increases
Solution Approach 1:
The patent extracts and eliminates the need for multiple pull-down maintaining modules that would occupy additional space in the circuit layout. By using the simplified configuration with the pull-up module and first controllable transistor working together, the circuit achieves the same stability function with fewer components, allowing for a more compact arrangement that reduces the LCD border width
Solution Approach 2:
The patent merges the maintaining function into the existing pull-up module and first controllable transistor configuration, rather than adding separate maintaining modules. This integration allows the same components to serve multiple purposes, reducing the overall circuit footprint and enabling a narrower LCD border while maintaining the required circuit stability
Data Source
AI summary
The present disclosure relates to a scanning driving circuit and a LCD. The scanning driving circuit includes first driving circuits and second diving circuits, each of the first driving circuits connects with each of the second diving circuits, and the first driving circuit and the second diving circuit are alternately arranged. Each of the first driving circuit and second diving circuit includes a pull-up module, a pull-up controlling module for driving the pull-up module, a reference voltage end, and a first pull-down maintaining unit. Each of the first driving circuit also includes a first pull-down maintaining controlling unit. The first and second driving circuit share the first pull-down maintaining control unit of the first driving circuit. In this way, the scanning driving circuit is stable, and the structure of the circuit is simple. The power consumption may be reduced and the border of the LCD may be narrowed down.