Bidirectional Gate Driving Circuit with Dummy Stages
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Solution Overview
Problem
The existing gate driving circuits in liquid crystal display (LCD) apparatuses require different timing control parts and increased signal lines for forward and reverse direction scan modes, leading to higher costs, increased complexity, and a larger area for the gate driving circuit, which affects the appearance of the display apparatus.
Innovation Solution
A gate driving circuit with a shift register and vertical start line that includes dummy stages and a clock line, allowing the same driving signal to be used for both forward and reverse direction scan modes, reducing the number of signal lines and area required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different timing control parts are used for forward and reverse direction scan modes, then the gate driving circuit can support both scan modes, but the device complexity and cost increase
Solution Approach 1:
The gate driving circuit uses a single timing control part that can operate in both forward and reverse direction scan modes by changing the start timing of gate signals. The shift register is designed with dummy stages at both ends, allowing the same circuit structure to support bidirectional scanning without requiring separate timing control circuits for each mode.
Solution Approach 2:
Instead of using different timing control parts for forward and reverse modes, the invention inverts the approach by using a single timing control part that adapts to both modes through configurable start timing. The vertical start line can be connected to different circuit stages depending on the desired scan direction, effectively making the same hardware serve multiple functions.
2Adaptability or versatility
If the number of control signals is increased to support both scan modes, then the gate driving circuit can be controlled flexibly, but the number of signal lines increases
Solution Approach 1:
The existing control signals are made multi-functional by configuring their timing and connection points. The vertical start signal can initiate scanning from different circuit stages depending on the desired direction, and the clock signal timing is adjusted to support both forward and reverse modes without requiring additional dedicated control signals for each mode.
3Adaptability or versatility
If the gate driving circuit area is increased to accommodate more control signals and components, then both scan modes can be supported, but the appearance of the display apparatus is deteriorated
Solution Approach 1:
The gate driving circuit is designed with universal components that serve multiple functions. The shift register includes dummy stages at both ends that can be activated depending on the scan direction, allowing the same physical circuit area to support both forward and reverse scanning without requiring additional dedicated circuit regions for each mode.
Data Source
AI summary
A gate driving circuit includes a shift register and a vertical start line. The shift register includes first to N-th circuit stages sequentially providing first to N-th gate-on signals to first to N-th gate lines, respectively, at least one reverse dummy stage adjacent to the first circuit stage and at least one forward dummy stage adjacent to the N-th circuit stage (N is a natural number). The vertical start line is electrically connected to the first circuit stage or the N-th circuit stage according to a scan direction and transfers a vertical start signal to the first or N-th circuit stage.