Drive Circuit Protect Module for Display Startup Flickering
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Solution Overview
Problem
Display devices experience flickering during startup due to the drive signal not reaching an ineffective voltage level immediately, affecting the display effect.
Innovation Solution
A drive circuit with a control module, output module, and protect module is designed to have a first state and a display state, where the protect module transmits an effective voltage signal to the first node, causing the output module to transmit an ineffective voltage signal to the output wire, preventing the pixel circuit from driving the display element to emit light during startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive circuit is simplified without a protect module, then the device complexity is reduced, but the display device exhibits flickering during startup due to the drive signal not reaching an ineffective voltage level immediately
Solution Approach 1:
The protect module performs preliminary action by pre-setting the first node to an effective voltage level before the drive circuit operates in display state. This preliminary voltage setting ensures that the output module receives proper control signals and outputs ineffective voltage levels to prevent pixel circuit activation during startup, thereby eliminating flickering before it occurs.
Solution Approach 2:
The protect module acts as an intermediary component between the power supply and the control module. It mediates the voltage signal transmission by controlling the voltage level at the first node, which in turn controls the output module's behavior. This intermediary function ensures that the output module receives appropriate control signals to maintain ineffective voltage levels on output wires during startup, preventing display element activation.
2Reliability
If the protect module is added to prevent flickering, then the display stability during startup is improved, but the drive circuit complexity increases
Solution Approach 1:
The drive circuit is segmented into distinct functional modules: the protect module for startup control, the control module for normal operation, and the output module for signal transmission. The protect module is specifically segmented to handle only the startup phase voltage control, while the control module handles the display phase. This segmentation allows each module to perform its specific function efficiently without interfering with others, adding minimal complexity while achieving reliable flickering prevention.
Data Source
AI summary
A drive circuit, a drive method, a shift register, and a display device are provided. The drive circuit includes a control module, an output module, and a protect module. The control module is electrically connected to a start signal line, first and second clock signal lines, first and second potential signal lines, and first and second nodes, and is configured to transmit a voltage signal to the first and the second nodes in response to first and second clock signals. The output module is electrically connected to the first and second potential signal lines, an output wire, and the first and second nodes. The protect module is configured to transmit an effective voltage signal to the first node in response to a control signal in a first state of the drive circuit such that the output module transmits an ineffective voltage signal to the output wire.