LCD Driving Circuit Controller Multiplexer Integration
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Solution Overview
Problem
Conventional liquid crystal display (LCD) driving circuits require multiplexers for each channel, increasing the size of the semiconductor chip due to the need for separate polarity control and data exchange mechanisms.
Innovation Solution
Integrating multiplexers into the controller, allowing data exchange based on a polarity control signal before storage in latches, and synchronizing this signal with a load signal to determine output polarity, thereby eliminating the need for multiplexers at each channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiplexers are provided to respective channels for data exchange based on polarity control signal, then data exchange and polarity control can be performed, but the size of channel region and semiconductor chip increases
Solution Approach 1:
The patent merges the multiplexer functionality from individual channels into a single shared multiplexer located in the controller. Instead of having separate multiplexers in each channel, the controller's multiplexer centrally manages data exchange for all channels based on the polarity control signal, thereby reducing the overall chip area while maintaining the data exchange capability.
Solution Approach 2:
The controller is designed with universal functionality to handle polarity control and data exchange for all channels through a single multiplexer. This multi-functional approach allows the same hardware component to serve multiple channels, eliminating the need for dedicated multiplexers in each channel and reducing chip size.
2Area of stationary object
If multiplexers are integrated to controller, then chip size is reduced, but data exchange timing and polarity control synchronization become more complex
Solution Approach 1:
The controller performs preliminary actions by generating the polarity control signal in advance and using it to control the shared multiplexer before data is distributed to channels. This advance control simplifies the timing requirements compared to having each channel independently manage its own multiplexer, as the controller centralizes the decision-making logic.
Solution Approach 2:
The controller acts as an intermediary between the polarity control signal source and the channel data paths. By introducing the controller as a central mediating component with a shared multiplexer, the system manages the complexity of synchronization centrally rather than distributing complexity across multiple channels, making the overall control logic more manageable.
Data Source
AI summary
A liquid crystal display driving circuit and method. A data register block of a controller applies in advance a polarity control signal to data before the data are stored in latches of a data driver, exchanges the data, and then stores the exchanged data in the latches. Thereby, it is possible to provide multiplexers, which are otherwise required for respective channels, to one controller and to decrease the size of a chip.