Display Driving IC Multiplexer Reduces Transmission Lines
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Solution Overview
Problem
Conventional display driving ICs face challenges in reducing the number of transmission lines for gray-scale data, which limits the integration and size reduction of LCD devices due to increased wiring space and power consumption.
Innovation Solution
The implementation of a display driving IC with multiplexers and demultiplexers that time-divide and sequentially transmit M-bit gray-scale data through L transmission lines, where L is less than M, allowing for reduced wiring requirements and improved integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If M-bit gray-scale data is transmitted in parallel through M transmission lines, then data transmission speed is improved, but the number of transmission lines increases leading to larger wiring space and increased chip height
Solution Approach 1:
The patent applies periodic action by sequentially transmitting M-bit gray-scale data through L transmission lines over multiple time periods. Instead of parallel transmission requiring M lines simultaneously, the system transmits data bits sequentially across L lines in a time-multiplexed manner, reducing the spatial wiring requirements while maintaining complete data transmission capability
Solution Approach 2:
The patent transitions from spatial parallel transmission (M lines simultaneously) to temporal sequential transmission (L lines over time). By adding the time dimension to the transmission process, the system reduces the number of simultaneous transmission lines needed, effectively converting a spatial problem into a temporal solution
2Area of stationary object
If the number of transmission lines is reduced to L lines where L < M, then wiring space and chip height are reduced, but data transmission complexity increases due to the need for multiplexing and demultiplexing
Solution Approach 1:
The patent introduces multiplexers and demultiplexers as intermediary devices that manage the conversion between parallel and serial transmission formats. These intermediaries handle the complexity of time-multiplexed data transmission, allowing the reduction of transmission lines from M to L while maintaining data integrity through controlled sequential access and proper signal reconstruction
Solution Approach 2:
The patent changes the transmission parameters by switching from parallel transmission mode to serial time-multiplexed mode. By altering the temporal and spatial distribution of data bits across transmission lines, the system reduces the number of required lines while managing complexity through parameter-controlled sequential transmission and reception protocols
3Ease of manufacture
If parallel transmission of M-bit gray-scale data is used, then manufacturing simplicity is maintained, but power consumption increases due to simultaneous signal transmission on multiple lines
Solution Approach 1:
The patent reduces power consumption by implementing periodic action where only L transmission lines are actively driven at any given time period, compared to driving all M lines simultaneously in parallel transmission. This time-multiplexed approach distributes the power load across multiple time slots, reducing peak and average power consumption while maintaining complete data transmission capability
Data Source
AI summary
A display driving integrated circuit (IC) capable of reducing the number of transmission lines for transmitting gray-scale data from a memory. The display driving IC receives M-bit gray-scale data to represent the gray scale of one pixel and drives a panel including a plurality of pixels. The display driving IC includes a memory storing gray-scale data representing the gray scales of the plurality of pixels, a source driver receiving the gray-scale data from the memory through transmission lines and transmitting the received gray-scale data to the panel, and at least one multiplexer to transmit the M-bit gray-scale data representing the gray scale of one pixel through L transmission lines, wherein the value of L is smaller than the value of M.