Liquid Crystal Display Data Driver Zigzag Switching
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Solution Overview
Problem
Liquid crystal displays require a large number of data lines and associated integrated circuits, leading to increased processing time, fabrication costs, and higher power consumption due to the dot inversion driving method.
Innovation Solution
A liquid crystal display employing a data driver using a column inversion method with a zigzag pattern of switching parts to reduce the number of data lines by half, allowing each data line to drive adjacent liquid crystal cells, and applying video signals with alternating polarities to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dot inversion driving method is used to maintain picture quality, then power consumption increases, but if a column inversion method is used to reduce power consumption, then picture quality deteriorates
Solution Approach 1:
The patent divides the liquid crystal display panel into multiple zones along the gate line direction, with each zone having its own switching part. This segmentation allows different inversion methods to be applied to different zones simultaneously, enabling the system to achieve both power savings and picture quality maintenance through localized control strategies
Solution Approach 2:
The patent dynamically switches between dot inversion and column inversion methods for different zones along the gate line. By making the inversion method dynamic and zone-dependent rather than uniform across the entire display, the system can optimize both power consumption and picture quality adaptively
2Reliability
If multiple data lines are used to drive liquid crystal cells, then picture quality improves, but fabrication costs and device complexity increase
Solution Approach 1:
The patent makes each data line universal by enabling it to drive multiple liquid crystal cells through different switching parts along the gate line direction. Instead of requiring dedicated data lines for each cell, a single data line can serve multiple cells by being selectively connected through the zigzag arrangement of switching parts, thereby reducing the total number of data lines while maintaining full display functionality
Solution Approach 2:
The patent introduces a temporal dimension to the data line usage by implementing time-multiplexed driving. Data lines are reused across different time periods (horizontal periods) to drive different sets of liquid crystal cells, effectively reducing the spatial number of data lines needed while maintaining complete coverage of the display panel
3Reliability
If multiple data lines are used to drive liquid crystal cells, then picture quality improves, but processing time increases
Solution Approach 1:
The patent implements periodic action by cycling through different zones and data line assignments in a systematic sequence. The gate driver sequentially activates different switching parts in a periodic manner, allowing the same data lines to be reused across multiple horizontal periods in an organized pattern, thereby reducing the overall processing time compared to using dedicated data lines for each cell
Data Source
AI summary
A LCD is adapted to reduce the number of data lines and drive circuits. The LCD can be driven in a dot inversion manner, using a data driver employing column inversion. A gate driver sequentially supplies first and second gate signals to gate lines. First and second switching parts are located in an ith horizontal line and supply video signals from data lines to LC cells by the control of an ith gate line. Third switching parts supply video signals to the cells located in the horizontal line, and are connected to the same data line as the second switching part, and are controlled by the ith and an i−1th gate lines. Fourth switching parts supply video signals to the cells located in the horizontal line and are connected to the same data line as the first switching part, and are controlled by the ith and i−1th gate lines.