LCD Microcontroller Remapping for Multi-Package Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in accommodating microcontroller IC chips with varying package types and I/O pad layouts, which can result in differing distributions of bonded and unbonded segment terminals, making it difficult to efficiently drive liquid crystal displays (LCDs) without causing electrophoresis effects from direct current.
Innovation Solution
A microcontroller with a remapping unit that generates logical mapping signals and maps them to physical segment terminal drivers based on specific package types, ensuring correct voltage application and disconnecting unused terminals to prevent DC voltage application, thereby maintaining the LCD's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same microcontroller IC chip is used with multiple package types having different I/O pad layouts, then the versatility and adaptability of the microcontroller is improved, but the complexity of mapping logical segment terminals to physical segment terminals increases
Solution Approach 1:
The patent introduces a remapping unit as an intermediary component between the LCD controller and the driver circuit. This remapping unit receives logical segment terminal signals from the LCD controller and remaps them to the appropriate physical segment terminals based on the detected package type. The remapping unit acts as a mediator that translates between the uniform logical interface and the varying physical interfaces of different package types, thereby resolving the mapping complexity while maintaining versatility.
Solution Approach 2:
The patent implements dynamic remapping capability where the mapping configuration can be changed based on the detected package type. The system dynamically adjusts the mapping between logical and physical segment terminals by detecting which package type is being used and activating the corresponding mapping configuration in the remapping unit. This dynamic adaptation allows the same microcontroller to work with multiple package types without requiring hardwired fixed mappings.
2Ease of manufacture
If segment terminals are continuously bonded in all packages, then the ease of manufacture is improved, but the reliability of LCD operation deteriorates due to DC voltage application causing electrophoresis effects
Solution Approach 1:
The patent implements periodic action by enabling only the segment terminals that are actually bonded and in use, while disabling those that are not bonded. The system periodically evaluates which segment terminals should be active based on the package type detection and remapping configuration, thereby preventing DC voltage application to unbonded terminals while maintaining continuous operation of bonded terminals. This selective enabling/disabling mechanism ensures reliability by avoiding electrophoresis effects on unused terminals.
Solution Approach 2:
The patent applies local quality by treating different segment terminals differently based on their bonding status and package type. Instead of uniformly enabling all segment terminals, the system applies different enabling/disabling states to different terminals according to their specific configuration in each package type. The remapping unit configures each segment terminal driver individually, enabling only those terminals that are physically bonded and disabling others, thereby maintaining reliability while allowing manufacturing flexibility.
3Adaptability or versatility
If the distribution of bonded and unbonded segment terminals varies by package type, then the adaptability to different packages is improved, but the difficulty of detecting and measuring the correct terminal configuration increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple mapping configurations in the remapping unit, each corresponding to a different package type. Before actual operation, the system detects which package type is being used and selects the appropriate pre-configured mapping. This preliminary preparation of multiple mapping options eliminates the need for complex real-time detection and configuration, as the correct mapping is already prepared and ready for selection based on simple package type identification.
Data Source
AI summary
A microcontroller for controlling a liquid crystal display (LCD) is mountable in any one of multiple package types. The microcontroller includes a LCD controller to generate logical mapping signals indicative of voltages to be applied to segment terminals of a LCD glass. A driver circuit drives the segment terminals selectively. A remapping unit receives the logical mapping signals from the LCD controller and maps the logical mapping signals, for each of the package types, to physical segment terminal drivers in the driver circuit based on a distribution of I/O terminals that are bonded for each package type when that package type is used with the LCD glass.