Shift Register Capacitor Segmentation for GOA Short Circuit Prevention
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Solution Overview
Problem
In the display field, GOA (gate driving on array) circuits require a capacitor structure that occupies a larger area, making them prone to short circuits due to small foreign particles, which disrupts the normal operation of the GOA circuit.
Innovation Solution
A shift register design that includes a voltage control circuit and at least one driving output circuit, featuring an output transistor and a capacitor structure arranged along a first direction, with conductive lines connecting them to signal output lines, allowing for improved maintenance and reduced impact of foreign particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a capacitor structure is designed in the GOA circuit, then the circuit can be realized with low cost and narrow frame, but the capacitor structure occupies a larger area and is prone to short circuits caused by foreign particles
Solution Approach 1:
The capacitor structure is divided into multiple capacitor units (first capacitor unit, second capacitor unit, etc.) connected in parallel. Each capacitor unit has its own conductive lines for connection. This segmentation allows that if one capacitor unit suffers a short circuit due to foreign particles, only the conductive lines connected to that specific unit need to be cut off, while other capacitor units can continue to function normally, thus resolving the contradiction between maintaining the GOA circuit design and preventing short circuit failures.
2Area of stationary object
If the capacitor structure occupies a larger area, then the GOA circuit can be implemented, but small foreign particles can cause short circuits disrupting normal operation
Solution Approach 1:
The large capacitor structure is segmented into multiple smaller capacitor units arranged in parallel. Each unit is connected through separate conductive lines. This segmentation reduces the sensitivity to foreign particles because a foreign particle affecting one unit will only impact that specific unit and its connected conductive lines, rather than causing a short circuit across the entire large capacitor structure. The other capacitor units remain unaffected and continue to provide the necessary capacitance for the GOA circuit operation.
3Ease of operation
If conductive lines are connected directly between output transistor and capacitor structure, then the circuit functions properly, but cutting off conductive lines for maintenance affects the entire capacitor structure
Solution Approach 1:
The circuit is designed with segmented capacitor units, each having dedicated conductive lines for connection to the output transistor and signal output line. This segmentation enables localized maintenance where only the conductive lines connected to the affected capacitor unit need to be cut off, rather than affecting the entire capacitor structure. The other capacitor units maintain their connections and continue to function, thus resolving the contradiction between ensuring proper circuit functionality and facilitating easy maintenance with minimal impact.
4Device complexity
If a single capacitor structure is used in the driving output circuit, then the circuit design is simplified, but the entire structure is vulnerable to short circuits from foreign particles
Solution Approach 1:
The single capacitor structure is replaced with multiple capacitor units connected in parallel, each unit maintaining the basic connection topology (connected to output transistor and signal output line) to preserve circuit design simplicity. However, the segmentation into multiple units provides redundancy such that if one unit suffers a short circuit from foreign particles, the other units continue to function, thus resolving the contradiction between simplified circuit design and reduced short circuit vulnerability.
Data Source
AI summary
A shift register is provided to include a voltage control circuit coupled to an output control node; at least one driving output circuit, each including an output transistor and a capacitor structure sequentially arranged along a first direction; a first conductive line therebetween and extending along a second direction and coupled to a signal output line configured for the driving output circuit; the output transistor includes a gate electrode coupled to the output control node and a first voltage writing electrode of the capacitor structure, a first electrode coupled to a clock signal line configured for the driving output circuit and a second electrode coupled to the first conductive line; a second conductive line is disposed between the first conductive line and the capacitor structure, and the first conductive line is coupled to a second voltage writing electrode of the capacitor structure through the second conductive line.