Display Panel Driving Circuit Isolation Switches for Signal Stability
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Solution Overview
Problem
In array substrate-type driving technology, the shared quiescent point in output circuits leads to excessive voltage during high-voltage writing phases, damaging thin film transistors and causing abnormal output signal waveforms.
Innovation Solution
A driving circuit with an input circuit, pull-down circuit, and output circuit featuring sub-output circuits connected via isolation switches, which establish and cut off connections based on control signals, and a pull-down circuit that pulls down control and output signals to a low level when necessary, reducing mutual influence and voltage at quiescent points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple sub-output circuits share a common quiescent point to reduce component count, then device complexity is reduced, but excessive voltage occurs at the quiescent point during high-voltage writing phases causing TFT damage and abnormal output signals
Solution Approach 1:
The patent divides the previously shared quiescent point into separate quiescent points for each sub-output circuit. By introducing isolation switches between adjacent sub-output circuits, the common quiescent point is segmented into individual quiescent points, preventing voltage accumulation and excessive voltage buildup during high-voltage writing phases, thus protecting TFTs from damage while maintaining signal integrity
Solution Approach 2:
The isolation switch acts as an intermediary element between adjacent sub-output circuits. It controls the connection state between different quiescent points, allowing isolation when needed to prevent voltage interference and enabling connection when appropriate for normal operation, thereby mediating between the need for component reduction and the need for voltage protection
2Stability of the object's composition
If sub-output circuits are isolated using isolation switches to prevent voltage interference, then output signal stability is improved, but device complexity increases due to additional components
Solution Approach 1:
The isolation switches are designed to dynamically change their connection state based on operational requirements. During high-voltage writing phases, the switches open to isolate circuits and prevent voltage interference; during normal operation, the switches close to connect circuits and enable signal transmission. This dynamic behavior provides signal stability when needed while minimizing the impact of additional components through intelligent state management
Data Source
AI summary
Disclosed are a driving circuit, a multi-stage driving circuit and a display panel. The driving circuit includes an input circuit, a pull-down circuit and an output circuit. The output circuit includes at least two sub-output circuits, the control terminals of the two adjacent sub-output circuits are connected through at least one isolation switch. Each sub-output circuit receives a control signal and a corresponding input signal output by the input circuit and outputs a corresponding output signal. An output terminal of each sub-output circuit is connected with the pull-down circuit and receives a pull-down signal. By arranging the isolating switch between the adjacent sub-output circuits, the mutual influence between the sub-output circuits is reduced, the problem that the output signal is abnormal is solved, the output signal is more stable on the basis of narrowing the frame of a display, and the competitiveness of the display is improved.