Time-Division Multiplexing Source Driver for LCD Layout Optimization
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Solution Overview
Problem
Conventional source drivers for liquid crystal display devices require a large number of transmission lines, leading to increased layout area and power consumption due to excessive coupling parasitic capacitors.
Innovation Solution
A time-division multiplexing source driver is implemented, utilizing multiple memory cells and control signals to share output transmission lines, allowing data sampling and transmission in alternating time periods, thereby reducing the number of required transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional source driver circuits with separate sampling and holding latch circuits are used, then data sampling and holding functions are achieved, but the number of transmission lines increases leading to larger layout area and higher power consumption
Solution Approach 1:
The patent combines the sampling latch circuit and holding latch circuit into a single integrated circuit block. The memory cells perform both sampling and holding functions sequentially within the same physical structure, eliminating the need for separate transmission lines for each function. This merging reduces the total number of transmission lines from 18 to 6, directly addressing the layout area problem while maintaining data sampling and holding capabilities.
Solution Approach 2:
The patent implements time-division multiplexing where memory cells alternately perform sampling and holding operations in different time periods. During the first time period, memory cells sample data; during the second time period, they hold and output the sampled data. This periodic action allows a single set of memory cells to fulfill both sampling and holding functions that previously required separate circuits and transmission lines, thereby reducing the layout area.
2Productivity
If conventional source driver circuits with multiple transmission lines are used, then data transmission is achieved, but excessive transmission lines create more coupling parasitic capacitors resulting in extra power consumption
Solution Approach 1:
The patent merges multiple transmission lines into a smaller number of shared transmission lines. Instead of having separate transmission lines for sampling data and holding data (18 lines total), the invention uses time-division multiplexing to share 6 transmission lines between both functions. This reduction in the number of transmission lines directly reduces the total parasitic capacitance, thereby lowering power consumption while maintaining full data transmission capability.
Solution Approach 2:
The patent uses periodic time-division multiplexing to alternate between sampling operations and holding/output operations. During the sampling phase, transmission lines carry sampled data; during the holding phase, the same lines carry held data to the output. This periodic reuse of transmission lines reduces the total number of lines required, which in turn reduces coupling parasitic capacitors and power consumption.
Data Source
AI summary
A data driver for time-division multiplexing includes a first memory cell set having first memory cells, a second memory cell set having second memory cells, and a plurality of output lines. Each first memory cell is used for generating a first data signal in response to a first sampling control signal, and for outputting the first data signal in response to a first transmitting control signal. Each second memory cell is used for generating a second data signal in response to a second sampling control signal, and for outputting the second data signal in response to a second transmitting control signal. During a first line time period, the first sampling control signal is triggered while the second transmitting control signal is triggered. During a second line time period, the first transmitting control signal is triggered while the second sampling control signal is triggered.