Source Driver Circuit Time-Division Multiplexing Layout Area
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Solution Overview
Problem
Conventional source driver circuits for liquid crystal displays require a large circuit layout area due to the high number of transmission channels needed to transmit pixel data, leading to increased size and power loss in devices like mobile phones with wide viewing angle displays.
Innovation Solution
The source driver circuit employs a time-sharing and multiplex data transmitting method using digital-to-analog converting units and sampling-transmitting units with sub-latch units and transmission channel sets, where pixel data is sampled and outputted in sequential periods, reducing the number of required transmission channels by sharing channels among sub-latch units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional source driver circuits use separate transmission channels for each pixel data bit, then data transmission reliability is improved, but circuit layout area increases significantly
Solution Approach 1:
The patent merges multiple transmission channels into a single shared transmission channel by using time-division multiplexing. Different sub-latch units transmit their data sequentially through the same channel at different time slots, thereby reducing the total number of transmission channels required while maintaining data integrity
Solution Approach 2:
The patent implements periodic action by dividing the transmission cycle into multiple time slots, where each sub-latch unit is assigned specific time slots for data transmission. This periodic time-division approach allows multiple units to share a single channel systematically, reducing circuit area while ensuring reliable periodic data delivery
2Measurement precision
If the number of transmission channels is increased to handle high-resolution pixel data, then image quality is improved, but power loss increases
Solution Approach 1:
Multiple transmission channels are merged into one shared channel through time-division multiplexing, reducing the total number of active channels simultaneously. This consolidation reduces power consumption while still supporting high-resolution pixel data transmission by utilizing the single channel across different time periods
3Speed
If more transmission channels are used to transmit pixel data simultaneously, then data transmission speed is improved, but device size increases
Solution Approach 1:
The patent uses periodic time-division multiplexing where data transmission occurs in sequential time slots rather than simultaneously. This approach maintains effective data transmission speed by ensuring continuous data flow through the single channel while avoiding the need for multiple parallel channels that would increase device size
Data Source
AI summary
A source driver circuit includes several sampling-transmitting units each including a first sub-latch unit, a second sub-latch unit and a transmission channel set. In a first period, the first sub-latch unit samples first pixel data. In a second period, the second sub-latch unit samples second pixel data. The transmission channel set electrically couples the first sub-latch unit and the second sub-latch unit to a corresponding digital-to-analog converting unit. In the second period, the first sub-latch unit outputs the first pixel data to the corresponding digital-to-analog converting unit via the transmission channel set. In a third period, the second sub-latch unit outputs the second pixel data to the corresponding digital-to-analog converting unit via the transmission channel set.