Active-Matrix Substrate Drive Circuit Noise Prevention
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Solution Overview
Problem
In active-matrix display devices, when one drive circuit is operated while others are stopped, noise from the selected gate line can cause malfunction in other drive circuits, leading to degradation and performance issues.
Innovation Solution
An active-matrix substrate is designed with a plurality of drive circuits and a signal supply unit that controls the potential of internal lines, ensuring that only the drive circuit actively switching the gate line receives a potential control signal, while others receive a drive signal to prevent noise-induced malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple drive circuits are provided for each gate line to reduce degradation, then reliability is improved, but noise from the selected gate line can cause malfunction in other drive circuits
Solution Approach 1:
A potential control circuit is introduced as an intermediary component between the drive circuit and the internal line. This circuit actively controls the potential of the internal line to prevent noise propagation, serving as a mediator that protects non-operating drive circuits from harmful electrical interference while allowing the system to benefit from multiple drive circuits
2Duration of action of stationary object
If drive circuits are operated at predetermined time intervals to suppress degradation, then drive circuit longevity is improved, but the gate line potential can enter other drive circuits as noise
Solution Approach 1:
The potential control circuit performs preliminary action by controlling the potential of the internal line before noise can propagate to non-operating drive circuits. By proactively managing the electrical potential state, the system prevents malfunction before it occurs, allowing drive circuits to be operated in alternating intervals without compromising reliability
Data Source
AI summary
A technique of, in the case of changing, at predetermined time intervals, a drive circuit for switching a gate line to a selected state, preventing a stopped drive circuit from malfunctioning is provided. Each of a plurality of drive circuits provided for each gate line in an active-matrix substrate includes: a selection circuit unit including an output switching element that is turned on to apply a voltage to the gate line in response to a control signal; an internal line connected to a gate terminal of the output switching element and the gate line; and a potential control circuit unit connected to the internal line for controlling a potential of the internal line in response to the control signal. At predetermined time intervals, a signal supply unit: supplies, to at least one of the plurality of drive circuits, a potential control signal so that the potential of the internal line is controlled to be lower than a threshold voltage of the output switching element by the potential control circuit unit; and supplies, to each of the other drive circuits, a drive signal so that a selection voltage is applied to the gate line by the selection circuit unit.