Shift Register Unit for OLED Gate Driver Pulse Width Control
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Solution Overview
Problem
The existing Gate Driver on Array (GOA) circuit integrated on LCD display panels cannot be directly applied to OLED displays due to the OLED's current-type light-emitting mechanism requiring TFTs to maintain a turned-on state for a long time, whereas LCDs do not need sustained activation of gate lines.
Innovation Solution
A shift register unit with a signal input module, pull-down module, pull-up module, first pull-up control module, and second pull-up control module is integrated on the OLED panel, allowing control of the pulse width of the output signal to manage the enabling time of gate lines, ensuring TFTs remain turned on for extended periods during OLED display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the GOA circuit integrated on LCD display panel is directly applied to OLED display, then the manufacturing cost is reduced, but the TFTs cannot maintain a turned-on state for a long time required by OLED's current-type light-emitting mechanism
Solution Approach 1:
The patent introduces dynamic control of the gate line activation duration through a shift register unit that generates extended pulse signals. The circuit dynamically adjusts the enabling time of gate lines to match OLED's requirement for long-duration turned-on state, transforming the static GOA circuit behavior into a dynamic system that adapts to OLED's specific needs.
Solution Approach 2:
The patent changes the temporal parameter of the gate line signal by extending the pulse width through the shift register unit. This parameter modification allows the gate lines to remain activated for the extended period required by OLED's current-type light-emitting mechanism, while maintaining the integrated GOA circuit architecture.
2Duration of action of moving object
If the pulse width of the output signal is extended to maintain TFTs turned on for long time, then the enabling time of gate lines is increased, but the gate lines may be activated during non-output phases causing interference
Solution Approach 1:
The patent applies local quality control by implementing precise spatial and temporal gating through the shift register unit. The circuit ensures that gate line activation is localized to specific output phases only, with different control signals applied to different time periods (first time period vs. second time period), preventing unwanted activation during non-output phases while maintaining extended activation during required phases.
Solution Approach 2:
The patent implements periodic control of gate line activation through the shift register unit, which generates signals in specific periodic phases. The first pull-up control module operates during a first time period while the second pull-up control module operates during a second time period, creating a periodic pattern that activates gate lines only during appropriate output phases and keeps them inactive during non-output phases.
Data Source
AI summary
A shift register unit and a control method thereof, a gate driving circuit, and a display device. The shift register unit includes a signal input module, connected to a signal input terminal, a first clock signal terminal and a control node; a pull-down module, connected to the control node, a first voltage terminal and a signal output terminal; a first pull-up control module, connected to the control node, the pull-up module and a second voltage terminal; a second pull-up control module, connected to the control node, the pull-up module, the first clock signal terminal, the first voltage terminal and a second clock signal terminal; and a pull-up module, connected to the signal output terminal and the second voltage terminal. The problem that it is difficult to realize a narrow display frame by the bonding process due to size increase of the driving circuit can be solved.