Shift Register Circuit Segmentation for OLED Emission Driving
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Solution Overview
Problem
The existing OLED emission driving circuits have a complicated structure and suffer from competitions in shift register units, leading to errors in output terminal performance, and cascaded shift registers experience signal deviations due to load effects in emission signal lines.
Innovation Solution
A simplified shift register structure with independent control modules for nodes and output, and cascaded shift registers where the carry terminal of one stage directly connects to the input of the next, eliminating signal deviations by bypassing loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift register includes reversing units and complex control structures, then the output control capability is improved, but the device complexity increases
Solution Approach 1:
The shift register is divided into multiple independent shift register units, each capable of autonomous operation. Each unit includes separate control modules for input signals, clock signals, and output control, allowing independent functionality while simplifying the overall structure by eliminating the need for complex reversing units.
Solution Approach 2:
Instead of using traditional reversing units to control output polarity, the patent inverts the approach by using dedicated control modules that directly generate the required output signals based on clock phases and input signals, thereby simplifying the structure while maintaining output control capability.
2Device complexity
If cascaded shift registers share common emission signal lines, then the device integration is improved, but signal deviations occur due to load effects
Solution Approach 1:
The patent introduces independent control modules in each shift register unit that act as intermediaries, generating output signals locally based on their own clock phases and input signals. This eliminates the need for cascaded stages to share common emission signal lines, thereby preventing signal deviations caused by load effects while maintaining circuit integration.
3Device complexity
If the shift register uses traditional cascaded structure with shared signal lines, then the device integration is improved, but competitions occur in shift register units leading to output errors
Solution Approach 1:
The shift register is segmented into multiple independent units, each with its own control modules for input signals, clock signals, and output control. This segmentation eliminates competitions between units by ensuring independent operation, while the cascaded connection of output terminals to input terminals of adjacent units maintains circuit integration.
Solution Approach 2:
Each shift register unit is designed with local control capabilities, where control modules within each unit generate output signals based on local clock phases and input signals. This local quality approach ensures that each unit operates independently without interference from other units, eliminating output errors while maintaining overall circuit integration.
Data Source
AI summary
The present disclosure provides a shift register. The shift register includes: a first node control module configured to control level at a first node based on a first clock signal and a second clock signal; a second node control module configured to control level at a second node based on level at the first node, the first clock signal, the second clock signal, a first low level signal and a high level signal; an output control module configured to control an output terminal to output high or low level based on level at the first node, level at the second node, the high level signal and a second low level signal; and a carry control module configured to control a carry terminal to output high or low level based on level at the second node, level at the output terminal, the high level signal and the second low level signal.