Bidirectional Scanning Gate Drive Circuit for LCD Panels
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Solution Overview
Problem
Existing gate drive circuits in LCD manufacturing are limited to scanning in a specific direction, restricting the use of LCD panels to a single drive mode.
Innovation Solution
A bidirectional scanning gate drive circuit is developed, comprising cascaded GOA units with modified input and output parts to receive and output signals during forward and backward scanning, enabling flexible drive modes by changing the connecting way of elements and signal inputting methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional GOA circuit is used, then the circuit structure is simple and easy to manufacture, but the scanning direction is fixed and drive mode versatility is poor
Solution Approach 1:
The patent applies universality by designing the GOA circuit to perform multiple scanning functions (forward scanning, backward scanning, and bidirectional scanning) through a single integrated circuit structure. The circuit can operate in different drive modes by controlling the scanning direction, making the gate drive circuit universal and adaptable to various display requirements without needing separate circuits for each scanning mode.
Solution Approach 2:
The patent implements dynamics by making the scanning direction controllable and changeable. The circuit can dynamically switch between forward scanning, backward scanning, and bidirectional scanning modes based on control signals. This dynamic capability allows the same circuit structure to adapt to different drive modes, resolving the contradiction between versatility and complexity.
2Adaptability or versatility
If the scanning direction is fixed in a conventional GOA circuit, then the circuit design is straightforward, but the LCD panel usage is restricted to a single drive mode
Solution Approach 1:
The patent makes the gate drive circuit universal by enabling it to support multiple scanning directions and drive modes. The circuit can be configured for forward scanning, backward scanning, or bidirectional scanning, providing usage flexibility for different LCD panel applications while maintaining a relatively simple integrated circuit structure.
Solution Approach 2:
The patent applies inversion by enabling the circuit to scan in reverse direction (backward scanning) in addition to the conventional forward scanning. This allows the circuit to operate in opposite directions by controlling the scanning sequence, thereby expanding usage flexibility without significantly complicating the circuit design.
3Reliability
If multiple separate circuits are used for different scanning modes, then each circuit can be optimized for its specific function, but the overall device complexity increases
Solution Approach 1:
The patent merges multiple scanning functions (forward scanning, backward scanning, and bidirectional scanning) into a single integrated GOA circuit. By combining these functions in one circuit rather than using separate circuits for each mode, the patent reduces overall device complexity while maintaining reliable scanning performance through unified circuit design and control.
Solution Approach 2:
The patent creates a universal GOA circuit that reliably performs multiple scanning functions through a single integrated design. The circuit incorporates control mechanisms that enable it to switch between different scanning modes, providing reliable operation for various drive modes without requiring multiple separate circuits, thus reducing overall device complexity.
Data Source
AI summary
Disclosed is a bidirectional scanning gate drive circuit and a liquid crystal display panel. The technical problem to be solved is that gate drive circuits in the prior art are provided with only one drive mode. The bidirectional scanning gate drive circuit includes an input part, a control part, and an output part. Signals enter the control part from the input part and then enter the output part or signals enter the control part from the output part and then enter the input part, so as to realize driving of a horizontal scanning line in an Nth stage.