LCD Demultiplexer Signal Path Minimization
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Solution Overview
Problem
As liquid crystal display (LCD) devices increase in size, the number of data lines and output channels in the data driver also increases, leading to a problem of enlarged size and complexity.
Innovation Solution
The LCD device incorporates a demultiplexer that connects multiple data lines to a single signal line, reducing the number of output channels by one-third, and minimizes the length of demultiplex signal lines to reduce signal load and prevent deterioration, thereby reducing the size of the data driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the liquid crystal panel becomes larger, then the display area increases, but the number of data lines and output channels increases leading to enlarged data driver size
Solution Approach 1:
The patent applies segmentation by dividing the data transmission function into two parts: a data driver that generates data voltages for only one line (reducing its complexity), and a demultiplexer that distributes these voltages to multiple data lines. This segmentation allows the data driver to remain compact while still supporting large display panels with many data lines.
Solution Approach 2:
The demultiplexer serves as an intermediary component between the data driver and the multiple data lines. It receives data voltages from the data driver and sequentially distributes them to the appropriate data lines, thereby reducing the number of output channels required in the data driver while maintaining full functionality for large displays.
2Device complexity
If the number of output channels is reduced, then the data driver size decreases, but the signal path length may increase causing signal deterioration
Solution Approach 1:
The patent implements preliminary action by having the data driver generate and hold data voltages ready before they are needed by multiple data lines. The demultiplexer then sequentially distributes these pre-generated voltages to the appropriate lines at the correct timing, ensuring signal integrity is maintained despite the reduced number of output channels.
Data Source
AI summary
The LCD device allows the three demultiplex signal lines to connect the center portion of the data driver with the center portion of the demultiplexer.