Liquid Crystal Display Data Line Arrangement for Source Drive Reduction
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Solution Overview
Problem
Liquid crystal display devices face increased costs and complexity due to the high number of source drive integrated circuits and large-sized PCBs and FPCs, which also result in low picture quality caused by electric coupling between data lines and common electrodes.
Innovation Solution
The liquid crystal display device arranges data lines along the short-axis direction and gate lines along the long-axis direction, with a common gate line used by two sub-pixels, and forms the common voltage line parallel to the data lines to prevent voltage changes, reducing the number of source drive integrated circuits and simplifying the PCB and FPC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data lines are arranged along the long-axis direction to increase the number of data lines for higher resolution, then the resolution is improved, but the number of source drive integrated circuits and the size of PCBs and FPCs increase
Solution Approach 1:
The patent merges the functions of multiple source drive integrated circuits into a single chip by integrating multiple data driving circuits. Each data driving circuit drives a specific number of data lines (e.g., 1024 data lines driven by one source drive IC), eliminating the need for multiple separate source drive integrated circuits while maintaining the ability to drive high-resolution displays.
Solution Approach 2:
The source drive integrated circuit is designed with multi-functionality to drive a large number of data lines through internal multiplexing and scanning mechanisms. The single source drive IC can sequentially drive multiple data lines by dividing them into groups and using time-division multiplexing, allowing one chip to perform the function of multiple chips.
2Measurement precision
If data lines are arranged along the long-axis direction to increase the number of data lines for higher resolution, then the resolution is improved, but the size of PCBs and FPCs increases
Solution Approach 1:
The patent combines multiple data driving circuits into a single source drive integrated circuit, which significantly reduces the number of external connections required to PCBs and FPCs. By integrating multiple driving functions into one chip with a reduced pin count, the overall size of the PCB and FPC can be minimized while still supporting high-resolution displays.
Solution Approach 2:
The patent transitions from a spatial arrangement requiring multiple separate chips to a temporal arrangement where a single chip sequentially drives multiple data lines through time-division multiplexing. This dimensional change from space to time allows reduction in PCB and FPC size while maintaining the ability to drive high-resolution displays.
3Device complexity
If common electrode crosses data lines to simplify structure, then the structure is simplified, but voltage changes occur causing low picture quality
Solution Approach 1:
The patent extracts the common electrode from its traditional position that crosses data lines and relocates it to run parallel to the data lines. This separation eliminates the harmful electric coupling between the common electrode and data lines, preventing voltage changes that would degrade picture quality while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a voltage holding capacitor as an intermediary element connected between the common electrode and the data line. This capacitor acts as a buffer to prevent voltage changes on the common electrode caused by capacitive coupling with data lines, thereby maintaining stable picture quality while allowing the simplified crossed structure.
Data Source
AI summary
A liquid crystal display device and a method of driving the same is disclosed, which can decrease the number of source drive integrated circuits ICs used to supply data, and can also decrease a flexible printed circuit and a printed circuit board to supply signals to the source drive integrated circuits ICs in size. The liquid crystal display device comprises a liquid crystal panel including a plurality of data lines formed along a long-axis direction of substrate, and a plurality of gate lines formed along a short-axis direction of substrate, wherein each gate line is orthogonal to each data line; a data driving circuit to supply data voltages to the data lines; a gate driving circuit to supply scan pulses to the gate lines; and a timing controller to supply digital video data to the data driving circuit, and to control the data driving circuit and the gate driving circuit.