Gate Driving Shift Register With ESD Isolation Between Rows
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Solution Overview
Problem
Display panels are susceptible to electrostatic discharge (ESD) interference, leading to abnormal split-screen displays due to the output signal of one row affecting the input signal of the next row.
Innovation Solution
A shift register design incorporating an output control module, full screen reset module, and cascade output module to manage ESD, ensuring that the output signal of one row does not affect the input signal of the next row by controlling the output and input signals independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output signal of one row is directly connected to the input signal of the next row in a cascaded shift register, then the display can continuously scan through all rows, but when electrostatic discharge occurs in one row, the output signal of that row will affect the input signal of the next row causing abnormal split-screen display
Solution Approach 1:
The patent introduces an output control module as an intermediary between the current row output and the next row input. This module includes a control transistor that can be turned on or off based on ESD detection signals. When ESD is detected in the current row, the transistor turns off, isolating the current row output from the next row input, thereby preventing the abnormal output from affecting subsequent rows while allowing normal operation when no ESD is present
Solution Approach 2:
The patent implements dynamic control of the signal transmission path by making the connection between rows conditional rather than fixed. The output control module dynamically adjusts the connectivity based on the ESD status: connected during normal operation for continuous scanning, and disconnected when ESD is detected to prevent propagation of abnormal signals. This dynamic adjustment resolves the contradiction between continuous operation and ESD protection
2Ease of operation
If the shift register outputs a gate turn-on signal to turn on TFTs in the pixel area, then the display can show content for the current row, but when ESD occurs the abnormal output signal will interfere with the next row's input signal
Solution Approach 1:
The patent converts the harmful ESD effect into a useful control signal. When ESD occurs in the current row, it generates an abnormal output signal that is detected by the control module. This detection triggers the output control module to turn off the connection, using the harmful ESD event as the basis for activating the protection mechanism. The full screen reset module also uses ESD detection to trigger a reset of all shift registers, converting the ESD event into a system-wide reset signal that prevents further interference
3Adaptability or versatility
If multiple cascaded shift registers are used to provide gate turn-on signals to multiple rows, then the display can scan through all rows, but the output of one row directly affects the input of the next row making ESD isolation difficult
Solution Approach 1:
The patent segments the cascaded shift register system into independent controllable units by inserting output control modules between each row. Each shift register stage can be independently controlled to connect or disconnect from the next stage based on ESD detection. This segmentation allows the system to maintain multi-row driving capability while adding isolation functionality without requiring complete redesign of the cascaded structure
Solution Approach 2:
The output control module serves multiple functions: it acts as a normal signal transmission path during non-ESD conditions, functions as an isolation barrier when ESD is detected, and works in conjunction with the full screen reset module to provide system-wide reset capability. This multi-functionality reduces the need for separate dedicated isolation components for each row, thereby managing complexity while providing comprehensive ESD protection
Data Source
AI summary
Embodiments of the present application provides a shift register, a gate driving circuit, a panel, a control method and a driving apparatus, the shift register comprises: an output control module, a full screen reset module, a cascade output module and an output module; the output control module is configured to turn on when there is no electrostatic discharge in the shift register so that the first gate signal output terminal outputs a target signal; the cascade output module is configured to provide the first voltage signal or the second voltage signal to the second gate signal output terminal when there is electrostatic discharge in the shift register.