Bidirectional Shift Register Using RS Flip-Flop Control Signals
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Solution Overview
Problem
Conventional display devices with bidirectional shift registers require a large circuit scale and increased manufacturing processes, leading to complexity and higher element counts, which complicates the circuit configuration and reduces yield.
Innovation Solution
A display device with a single channel bidirectional shift register that uses RS flip-flop circuits with transistors and capacitive elements to control scanning directions using scanning direction control signals, allowing for bidirectional scanning without increasing the number of elements, thereby reducing circuit scale and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two shift registers are provided for forward and reverse scanning, then bidirectional display capability is achieved, but circuit scale is almost doubled
Solution Approach 1:
A single shift register circuit is designed to perform both forward scanning and reverse scanning functions by utilizing scanning direction control signals to switch the operational mode. The circuit incorporates RS flip-flop circuits that can be configured to operate in different scanning directions based on control inputs, eliminating the need for separate forward and reverse shift registers while maintaining bidirectional display capability
Solution Approach 2:
The shift register circuit incorporates dynamic reconfiguration capability through scanning direction control signals that change the operational state of RS flip-flop circuits. The circuit transitions between forward scanning and reverse scanning modes based on real-time control signals, allowing a single static circuit structure to perform multiple dynamic functions without requiring separate dedicated circuits for each direction
2Ease of manufacture
If a single channel shift register is used, then manufacturing processes are reduced, but the circuit configuration becomes complex and increases the number of elements required
Solution Approach 1:
The patent merges the scanning direction control function with the shift register operation by integrating scanning direction control signals into the RS flip-flop circuit configuration. Instead of using separate control circuits for scanning direction, the control signals are directly incorporated into the flip-flop structure, combining multiple functions into a unified circuit that reduces overall complexity while maintaining bidirectional capability
Solution Approach 2:
The RS flip-flop circuits are designed to automatically configure their operation based on scanning direction control signals without requiring external control logic. The circuit self-adjusts its scanning direction and operational state through the control signals, eliminating the need for additional control elements and simplifying the overall circuit configuration while maintaining ease of manufacture
Data Source
AI summary
The present invention provides a display device that has a driving circuit including a single channel bidirectional shift register with which the circuit scale can be reduced without increasing the number of elements.The driving circuit includes a single channel bidirectional shift register. This single channel bidirectional shift register has an RS flip-flop circuit. The RS flip-flop circuit includes a first transistor having a first electrode connected to an output terminal and having a second electrode to which a second scanning direction control signal is applied and a second transistor having a first electrode connected to an output terminal and having a second electrode to which a first scanning direction control signal is applied. In this circuit configuration, a resetting signal is applied to a control electrode of the first transistor in a first scanning direction, a setting signal is applied to the control electrode of the first transistor in a second scanning direction which is a direction opposite to the first scanning direction. The setting signal is also applied to a control electrode of the second transistor in the first scanning direction, and the resetting signal is also applied to the control electrode of the second transistor in the second scanning direction.