Liquid Crystal Display Data Line Reduction via Time-Division Multiplexing
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) require a large number of data drivers and integrated circuits to drive the increasing resolution, leading to higher manufacturing costs and longer process times due to the need for multiple data lines.
Innovation Solution
The implementation of a liquid crystal display device with a reduced number of data lines by using a horizontal two-dot inversion system, where first and second liquid crystal cells are alternately driven with pixel signals of the same polarity, shared between adjacent data lines, reducing the number of data lines and data drivers required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to drive higher resolution liquid crystal cells, then the display resolution is improved, but the number of data drivers and integrated circuits increases, leading to higher manufacturing costs and longer process times
Solution Approach 1:
The patent merges the function of multiple data lines into a single data line by time-division multiplexing. First and second liquid crystal cells that would traditionally require separate data lines are driven alternately through a single data line using different time periods, thereby reducing the number of data drivers needed while maintaining the ability to drive high-resolution displays
Solution Approach 2:
The patent implements periodic action by alternately driving first and second liquid crystal cells in different time periods. During a first time period, the first liquid crystal cell is driven; during a second time period, the second liquid crystal cell is driven. This periodic time-division approach allows a single data line to serve multiple cells that would otherwise require dedicated data lines
2Device complexity
If the number of data lines is reduced to lower manufacturing costs, then the number of data drivers is reduced, but the ability to drive high-resolution liquid crystal cells is compromised
Solution Approach 1:
The patent uses periodic time-division multiplexing to allow a single data line to carry signals for multiple liquid crystal cells at different time periods. This maintains display resolution capability while reducing the physical number of data lines required
Solution Approach 2:
The patent introduces dynamic control through additional control lines (first and second control lines) that dynamically switch which liquid crystal cell is active during each time period. This dynamic switching enables a static reduction in data line count while maintaining the functional capability to address multiple cells
3Illumination intensity
If more data drivers are used to maintain signal integrity across more data lines, then the light transmittance control is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple data driver functions into a single data driver by implementing time-division multiplexing. The single driver alternately drives multiple liquid crystal cells during different time periods, eliminating the need for multiple expensive data drivers while maintaining adequate light transmittance control through the dynamic switching mechanism
Solution Approach 2:
The patent makes a single data line and data driver universal by enabling them to serve multiple liquid crystal cells through time-division multiplexing. The same data line and driver are reused for different cells at different time periods, reducing component count and manufacturing cost while maintaining functional capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the number of data lines and data drivers by half, lowering manufacturing costs while maintaining effective light transmittance and minimizing crosstalk, thereby improving the efficiency and cost-effectiveness of the LCD.
Implementation Method 1
a liquid crystal display (LCD) controls the light transmittance of liquid crystal using an electric field, to thereby display a picture
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel having a plurality of data lines; a plurality of gate lines crossing the data lines; first and second control lines parallel to the gate lines; first liquid crystal cells provided at one side of the data lines, respectively; second liquid crystal cells provided at another side of the data lines, respectively; a first switching part that drives the first liquid crystal cells, the first switching part being controlled by the first control line and the gate line; a second switching part that drives the second liquid crystal cells, the second switching part being controlled by the second control line and the gate line; and a liquid crystal display panel driver that supplies pixel voltage signals having the same polarity to the first and second liquid crystal cells positioned between adjacent i-numbered data lines and (i+1)-numbered data lines.