Scanning Trigger Unit for Narrow Bezel Gate Driving Circuits
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Solution Overview
Problem
The presence of separate Vertical Starting (STV) signal lines in gate driving circuits for TFT-LCDs increases the layout area, making it difficult to achieve a narrow bezel, which is disadvantageous for display panels.
Innovation Solution
A scanning trigger unit is introduced, comprising a clock signal terminal, signal input terminals, and sub-circuits that generate STV and reset signals, eliminating the need for separate STV signal lines by integrating these functions within the gate driving circuit, thereby reducing the layout area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate STV signal lines are provided for first stage shift register and last stage shift register, then the gate driving circuit can be formed on display panel, but the layout area increases
Solution Approach 1:
The patent combines the STV signal input functions for both the first stage and last stage shift registers into a single shared STV signal line. The scanning trigger unit generates a single STV signal that is distributed to multiple shift register stages, eliminating the need for separate STV signal lines and reducing the overall layout area of the gate driving circuit.
Solution Approach 2:
The STV signal line is designed to serve multiple functions simultaneously - it provides the start signal to the first stage shift register and also to the last stage shift register through the scanning trigger unit. This multi-functional design reduces the number of dedicated signal lines required, thereby reducing layout area while maintaining ease of manufacture.
2Ease of operation
If multiple stages of cascaded shift registers are provided with separate STV signal lines, then each stage can be independently controlled, but the bezel width increases
Solution Approach 1:
The patent merges the STV signal distribution into a single line that serves multiple stages. The scanning trigger unit enables one STV signal to control multiple shift register stages (first stage and last stage) simultaneously, reducing the horizontal space required for signal lines and thus decreasing the bezel width while maintaining independent stage control through the trigger unit's internal logic.
Solution Approach 2:
The patent introduces a vertical dimension for signal distribution by using a scanning trigger unit that can distribute the STV signal to multiple stages in the vertical direction (through the circuit architecture) rather than requiring horizontal separation. This dimensional change in signal routing reduces the horizontal bezel width while preserving independent stage control capabilities.
Data Source
AI summary
According to one aspect of this disclosure, a scanning trigger unit includes a clock signal terminal, a first signal input terminal, a fixed level signal terminal, a first input sub-circuit, an output sub-circuit, a first holding sub-circuit, and a signal output terminal. The first input sub-circuit is connected to the first signal input terminal and a control node, and is configured to provide a first valid signal to the control node; the output sub-circuit is connected to the fixed level signal terminal, the clock signal terminal, and the control node, and is configured to provide a second valid signal to the signal output terminal; and the first holding sub-circuit is connected to the fixed level signal terminal and the signal output terminal, and is configured to hold the second valid signal at the signal output terminal for a predetermined time.