Bi-directional Shift Register for Panel Displays

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Solution Overview

Problem

Existing shift registers in panel displays are incapable of achieving bi-directional scanning, limiting their ability to perform both forward and reverse scanning operations.

Innovation Solution

Incorporating forward and reverse scanning switch modules into the shift register units, which allow the shift register to output signals in both directions by controlling the pull-up and pull-down driving modules based on specific scanning signals, enabling bi-directional scanning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional shift register unit is used with single-direction signal flow, then the circuit structure is simple, but bi-directional scanning capability is lost

Engineering Contradiction:

Improvescanning direction capabilityVSAvoidshift register unit structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The shift register unit is segmented into multiple functional modules: forward scanning switch module, reverse scanning switch module, pull-up driving module, and pull-down driving module. Each module has a specific function, allowing independent control of signal flow direction while maintaining overall circuit organization and manageability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shift register unit is designed with multi-functionality to perform both forward scanning and reverse scanning operations. By incorporating dual scanning switch modules and dual driving modules, the same circuit structure can adapt to different scanning directions based on control signals, eliminating the need for separate circuits for each direction.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If forward scanning only is implemented, then the circuit design is straightforward, but reverse scanning requirement cannot be met

Engineering Contradiction:

Improvescanning mode flexibilityVSAvoidcontrol complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The shift register unit employs dynamic control through scanning control signals that can switch the circuit operation mode between forward scanning and reverse scanning. The switch modules and driving modules respond dynamically to control signals, enabling flexible adaptation to different scanning requirements without manual circuit reconfiguration.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9123283B2Shift register, gate driving circuit and display apparatus

Publication Date: 2015.09.01 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure relates to a shift register, a gate driving circuit and a display apparatus, wherein the shift register outputs an output signal of each stage in a forward direction according to a forward scanning signal and outputs the output signal of each stage in a reverse direction according to a reverse scanning signal, each stage of the shift register includes a forward scanning switch module, a reverse scanning switch module, a pull-up driving module; a pull-up module; a pull-down driving module; a first pull-down module; and a second pull-down module. A bi-directional scanning can be achieved by using the forward scanning switch module and the reverse scanning switch module to control to input different signals to different modules.