Gate Signal Line Driving Circuit for Stable Bidirectional Scanning
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Solution Overview
Problem
Existing gate signal line driving circuits face issues with increased circuit size and noise instability during bidirectional scanning, particularly due to the requirement for multiple switching elements and the use of DC voltage for setting shift direction, which leads to deterioration of shift register circuit characteristics.
Innovation Solution
A gate signal line driving circuit utilizing 2n-phase clock signals with different phases, where clock signals are input in specific sequences for normal and inverse directional scanning, incorporating high-voltage and low-voltage switching circuits, and control signals to manage the output voltage and reduce noise, thereby minimizing circuit size and noise instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switching elements are used to control shift direction in response to DC voltage settings, then bidirectional scanning capability is achieved, but circuit size increases and element deterioration occurs
Solution Approach 1:
The patent changes the control parameter from DC voltage to alternating voltage that switches between positive and negative cycles. This allows the same circuit elements to control shift direction without requiring multiple switching elements or DC voltage settings, thereby reducing circuit size while maintaining bidirectional scanning capability
Solution Approach 2:
The patent employs periodic alternating voltage with positive and negative cycles to control the shift register circuit. By applying voltage in periodic alternation rather than using multiple DC voltage levels, the circuit achieves bidirectional control with fewer elements, reducing overall circuit complexity
2Adaptability or versatility
If multiple switching elements are used to control shift direction, then bidirectional scanning is enabled, but switching element deterioration accelerates
Solution Approach 1:
The patent changes the voltage application mode from static DC voltage to dynamic alternating voltage. This allows single switching elements to control both forward and reverse directions by responding to positive and negative voltage cycles respectively, reducing the number of switching elements and thereby improving reliability
Solution Approach 2:
The patent makes each switching element universal by enabling it to control both forward and reverse shift directions through alternating voltage application. Instead of dedicating specific switching elements to specific directions, each element can perform multiple functions depending on the voltage polarity, reducing total element count and improving reliability
3Adaptability or versatility
If gate signals are reset by other basic circuits using two gate signals, then bidirectional control is achieved, but gate signal stability decreases and noise increases
Solution Approach 1:
The patent introduces a clock signal as an intermediary that mediates the reset operation between basic circuits. Instead of directly using gate signals from other circuits to reset, the clock signal coordinates the reset timing and ensures stable voltage application, reducing noise and improving gate signal stability while maintaining bidirectional control
Data Source
AI summary
Provided is a gate signal line driving circuit including: 2n clock signal lines where 2n-phase clock signals are input in the normal order of the sequence in normal-directional scanning and in the inverse order of the sequence in inverse-directional scanning, respectively; and a plurality of basic circuits, each being connected with the 2n clock signal lines and outputting a gate signal from an output terminal, in which each of the basic circuits includes a high-voltage applying switching circuit where one clock signal line is connected to an input side and applies a voltage applied to the clock signal line to the output terminal and an off-signal applying switching circuit that applies an off-voltage to a switch of the high-voltage applying switching circuit, and a clock signal line where a clock signal having an inverse phase is connected to a switch of the off-signal applying switching circuit.