Closed-Loop Data Lines for LCD Drive IC Reduction
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Solution Overview
Problem
The high cost and increased load of data lines and drive ICs in active matrix liquid crystal display devices, particularly as resolution increases or panel size grows, necessitate a reduction in the number of data lines and drive ICs while maintaining efficient operation.
Innovation Solution
The implementation of a closed-loop data line structure with zigzag patterned gate lines and switch devices that supply data voltage to odd- and even-numbered pixel rows through synchronized scan pulses, reducing the number of data drive ICs and load on data lines by connecting data lines at top and bottom ends and using storage capacitors to maintain pixel voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of data lines and drive ICs is increased to support higher resolution and larger panel size, then the display quality and coverage are improved, but the cost and device complexity increase
Solution Approach 1:
Adjacent data lines are electrically connected to form closed loops, merging multiple data lines into a single functional unit. This allows one data drive IC to control multiple data lines, reducing the total number of drive ICs needed while maintaining full display coverage
Solution Approach 2:
Each data line in a closed loop can serve multiple pixel rows sequentially through time-division multiplexing. The same data line structure serves both adjacent pixel rows, making the data line system multi-functional and reducing the overall number of data lines required
2Device complexity
If the number of data lines is reduced to lower cost and complexity, then the device becomes more economical, but the electrical resistance and load on remaining data lines increase
Solution Approach 1:
Scan pulses are applied periodically to gate lines in alternating patterns to sequentially activate TFTs in different pixel rows. This periodic gating allows the same data line to serve multiple rows at different time periods, reducing data line count while maintaining voltage stability through time-division multiplexing
Solution Approach 2:
Storage capacitors are pre-connected to pixel electrodes during the programming phase, storing the data voltage before the pixel is read. This preliminary voltage storage compensates for any voltage drop in the data line, ensuring stable voltage delivery even with reduced data line count
Data Source
AI summary
A liquid crystal display device and driving method is provided. The liquid crystal display device includes a first data line to which a data voltage is supplied and a second data line separated from the first data line with a pixel row therebetween and connected to the first data line in top and bottom ends. A first gate line crosses the first and second data lines. A second gate line crosses the first and second data lines. A first switch device is operable to supply the data voltage from the first data line to a pixel electrode of an odd-numbered pixel row in response to the first scan pulse. A second switch device is operable to supply the data voltage from the second data line to a pixel electrode of an even-numbered pixel row in response to the second scan pulse.