Shift Register Unit for Stable AMOLED Emission Control
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Solution Overview
Problem
The Emission Gate Driver (Emission GOA) in AMOLED displays experiences unstable low-level output due to clock signal interference, leading to dithering and decreased display quality.
Innovation Solution
A shift register unit comprising an input module, output control module, pull-up module, and output pull-down module, which cooperates to ensure a stable low-level signal output, unaffected by clock signals, through specific timing sequences and transistor configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional Emission GOA is used to control light emitting of pixels, then the circuit can be implemented, but the output low level becomes unstable due to clock signal interference, causing dithering phenomenon and descending display quality
Solution Approach 1:
The patent introduces an emission control module as an intermediary between the shift register and the pixel rows. This module includes a control transistor that receives both the output signal from the shift register and a clock signal, and uses these to control the emission of light from pixel rows. The intermediary structure isolates the pixel emission control from direct clock signal interference while still enabling synchronized emission control, thereby stabilizing the output low level without eliminating the clock signal's functional role.
2Device complexity
If the Emission GOA directly controls pixel light emitting, then the structure can be simplified, but clock signals directly affect the output causing dithering and unstable low level
Solution Approach 1:
The patent segments the emission control function into two independent modules: a shift register module that generates sequential output signals, and an emission control module that receives both the shift register output and clock signals to control actual pixel emission. This segmentation allows each module to perform its function optimally without interfering with the other, maintaining structural clarity while improving signal stability by preventing clock signal direct injection into the output line.
3Productivity
If clock signals are used to control emission timing, then synchronized light emitting can be achieved, but clock signal interference degrades the output signal quality
Solution Approach 1:
The emission control module serves as an intermediary that receives clock signals and the shift register output separately, processes them through a control transistor, and generates the final emission control signal. This intermediary approach maintains synchronized emission control by utilizing clock signals for timing, while simultaneously protecting output signal quality by preventing direct coupling between clock signal variations and the output line, thus resolving the contradiction between synchronization and signal quality.
Data Source
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AI summary
The present invention relates to display technology field, provides a shift register unit and a method for driving the same, a shift register, and a display apparatus for solving a problem that the shift register unit of prior art cannot output a stable signal. The shift register unit of the present invention comprises an input module, a pull-up module, an output control module and an output pull-down module; the input module is connected with a signal input terminal, a first clock signal input terminal and a low level signal terminal; the output control module is connected with a second clock signal input terminal and a high level signal terminal; the pull-up module is connected with the high level signal terminal; the output pull-down module is connected with the first clock signal input terminal, the second clock signal input terminal, the high level signal terminal and the low level signal terminal.