Bidirectional Shift Register Scan Signal Stability
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Solution Overview
Problem
Existing liquid crystal display (LCD) technologies face challenges in improving the reliability and reducing the circuit layout area of bidirectional shift register devices, particularly in managing high current loads and preventing component damage.
Innovation Solution
The implementation of a bidirectional shift register device with N stages of shift registers, each comprising a pre-charge unit, a pull-up unit, and a pull-down unit with two discharge units, where the discharge units are controlled by voltage-dividing signals to stabilize the scan signal level and reduce the load on high current-bearing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single discharge unit is used in the shift register device, then the circuit layout area is smaller, but the reliability is reduced due to high current load on single component
Solution Approach 1:
The single discharge unit is divided into two discharge units (first discharge unit and second discharge unit). Each discharge unit has its own current-bearing component (first and second third transistors), which distributes the high current load across multiple components rather than concentrating it on a single component, thereby improving reliability while maintaining a manageable circuit layout area.
2Reliability
If voltage-dividing signals are implemented in discharge units, then the load on high current-bearing components is reduced, but the device complexity increases
Solution Approach 1:
Voltage-dividing signals are introduced as intermediary control signals for the discharge units. These signals divide the voltage load and control the switching of the third transistors in each discharge unit, thereby reducing the current-bearing burden on individual components. The voltage-dividing mechanism acts as a mediator that protects high current-bearing components while the overall device complexity remains acceptable due to the systematic design.
Data Source
AI summary
A liquid crystal display and its bidirectional shift register device including N stages of shift registers are provided. An ith stage shift register of the shift registers includes a pre-charge unit, a pull-up unit and a pull-down unit. The pre-charge unit outputs a pre-charge signal according to outputs of (i−2)th and (i+2)th stage shift registers. The pull-up unit outputs a scan signal. A first discharge unit of the pull-down unit determines whether to pull the scan signal down to a reference voltage potential according to the pre-charge signal and a first voltage-dividing signal associated with a first level signal. A second discharge unit of the pull-down unit determines whether to pull the scan signal down to the reference voltage potential according to the pre-charge signal and a second voltage-dividing signal associated with a second level signal.