Bi-directional Driver Circuit for Display Devices
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Solution Overview
Problem
Existing bi-directional scanning circuits in display devices increase the picture-frame area and are prone to display issues due to current leakage on scanning signal lines, which can lead to abnormality in signal transmission and subsequent screen failures.
Innovation Solution
A display device design with scanning signal lines arranged in parallel across the display area, utilizing a driver circuit with multiple stages of circuit blocks that apply active potential in both forward and reverse directions, allowing for independent operation of right and left driver circuits, each with transistors controlling conductivity between scanning and clock signal lines, and using multiphase clock signals to manage conductivity and reduce circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If circuits are arranged on one side of the display area in a bi-directional scanning circuit, then the bi-directional scanning function is achieved, but the picture-frame area increases
Solution Approach 1:
The driver circuit is divided into multiple independent stages (first stage, second stage, third stage, etc.), each capable of operating independently. The circuit blocks are segmented into right and left portions that can function separately, allowing the system to achieve bi-directional scanning while reducing the overall circuit area by distributing components more efficiently across the display area.
2Adaptability or versatility
If a bi-directional scanning circuit is used, then scanning flexibility is improved, but the risk of cascading failures increases due to current leakage on scanning signal lines
Solution Approach 1:
The driver circuit is divided into multiple independent stages that can operate autonomously. When current leakage occurs on a scanning signal line, only the affected stage is impacted while other stages continue to function, preventing cascading failures and maintaining display reliability.
Solution Approach 2:
The circuit design incorporates redundant pathways and independent stage operations that act as a buffer against failures. If one stage fails due to current leakage, the system has pre-established alternative pathways through other stages to maintain functionality, cushioning against the impact of the failure.
3Adaptability or versatility
If circuit scale is increased to accommodate bi-directional scanning circuits, then scanning functionality is achieved, but the picture-frame area reduction is prevented
Solution Approach 1:
The circuit layout transitions from a conventional one-sided arrangement to a distributed arrangement that utilizes both sides of the display area. By placing circuit blocks on both the right and left sides, the design effectively uses the available space in a new dimensional configuration, reducing the picture-frame area while maintaining scanning functionality.
Data Source
AI summary
The plurality of stages of circuit blocks of a driver circuit in a display device include a first transistor and a second transistor. The first transistor is connected at its gate with a first node and controls conductivity between a scanning signal line and a first clock signal line applied with a first clock signal. The first node is at an active potential when at least any one signal of signals output from one stage in each of a forward direction and a reverse direction is at the active potential. The second transistor is connected at its gate with the first node and controls conductivity between the first clock signal line and an input signal line of another stage of circuit block.