Cascaded Scanning Driving Circuit for Flat Display Narrow Border Design
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Solution Overview
Problem
Conventional scanning driving circuits for flat displays face challenges in cost reduction, circuit complexity, and narrow border design due to dual-driving modes that result in voltage differences across the panel, leading to display performance issues and increased space occupation.
Innovation Solution
A scanning driving circuit design featuring cascaded-connected scanning driving units on both sides of the display, with each unit including input, latch, reset, and output circuits, and a clock control circuit that selectively outputs signals to either scanning line, ensuring balanced voltages and simplified circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If left-right dual-driving mode is adopted to reduce manufacturing cost, then one scanning line is driven by single-side scanning driving unit, but loading increases and signal delay occurs
Solution Approach 1:
The scanning driving circuit is segmented into multiple independent scanning driving units distributed across different sides of the display panel. Each unit independently drives specific scanning lines, avoiding the overload problem of single-side driving while maintaining manufacturing simplicity through modular design.
Solution Approach 2:
Multiple scanning driving units from different sides are merged to cooperatively drive the same scanning lines. This combining approach distributes the driving load across multiple units, reducing individual unit loading while maintaining cost-effectiveness through shared circuit architecture.
2Ease of manufacture
If left-right dual-driving mode is adopted, then scanning driving units are arranged at lateral sides, but voltage difference occurs affecting display performance
Solution Approach 1:
The circuit design incorporates symmetric signal transmission paths and balanced voltage reference points that ensure equal potential conditions across the display panel. This equipotential design eliminates voltage differences between lateral sides, preventing display performance degradation while maintaining the cost-effective dual-driving architecture.
3Reliability
If dual-direction driving method is adopted to drive scanning lines, then two scanning driving units are configured for one scanning line, but circuit design becomes complicated and space increases
Solution Approach 1:
Each scanning driving unit is designed with universal functionality to drive multiple scanning lines through different output paths. This multi-functionality allows a single unit type to serve multiple purposes, reducing the need for specialized duplicate circuits and simplifying overall design while maintaining reliable scanning line驱动.
Solution Approach 2:
The scanning driving units incorporate dynamic switching mechanisms that allow flexible configuration of signal paths. This dynamic capability enables the same hardware to adaptively serve different scanning lines based on operational requirements, reducing static circuit complexity while maintaining driving reliability.
4Reliability
If dual-direction driving method is adopted, then more scanning driving units are configured, but occupied space increases affecting narrow border design
Solution Approach 1:
The scanning driving units are nested within the existing border region structure, utilizing available space efficiently. The circuit elements are arranged in a compact nested configuration that fits within the boundary constraints, ensuring reliable scanning line driving without exceeding space limitations for narrow border design.
Data Source
AI summary
The present disclosure relates to a scanning driving circuit and a flat display device. The scanning driving circuit includes a plurality of cascaded-connected scanning driving units respectively arranged at two lateral sides of a flat display device. With respect to the same level, the scanning driving unit at both sides connect to two the same scanning lines. Each of the scanning driving units includes: an input circuit configured to charge a pull-up and a pull-down control signal points; a latch circuit configured to latch signals received from the input circuit; a reset circuit configured to reset a level of the pull-up control signal point; an output circuit configured to generate scanning driving signals; and a clock control circuit configured to selectively output the scanning driving signals to the first scanning line or the second scanning line via third clock signals or fourth clock signals.