LCD Module Enable Signal Setup Time Adjustment
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Solution Overview
Problem
Image forming apparatuses, such as multifunction devices, often experience data breakdown on their displays due to overheating from nearby heat sources or latent heat from printed paper, and incorrect timing of control signals during LCD module replacement.
Innovation Solution
Incorporating a microcomputer with a data transceiver, comparator, enable signal adjuster, and scaler to adjust the setup time of enable signals by comparing written and read data, ensuring synchronization and preventing data breakdown by extending the basic setup time as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the LCD module is located near heat sources or above paper discharge portion, then the device can be compact and functional, but data displayed on the display may be broken due to overheating and latent heat
Solution Approach 1:
The patent applies preliminary action by adjusting the setup time of the enable signal before data transmission to the LCD module. The microcomputer extends the setup time of the enable signal that latches data in the LCD module's storage unit, ensuring data is properly captured before thermal conditions can cause corruption. This preventive timing adjustment occurs continuously or periodically to maintain display reliability despite thermal stress from nearby heat sources and paper discharge.
2Ease of repair
If the LCD module is replaced, then the device can be maintained or upgraded, but broken data may be displayed due to incorrect timing of control signals
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the setup time parameter of the enable signal based on operating conditions. The microcomputer monitors data integrity by comparing transmitted data with data read back from the LCD module's storage unit, and when discrepancies are detected or after LCD replacement, it extends the setup time parameter to ensure proper data latching. This adaptive parameter adjustment maintains compatibility and reliability across different LCD modules and operating temperatures.
3Manufacturing precision
If the setup time of enable signal is extended, then data transmission accuracy is improved, but the response time and productivity of the display system decreases
Solution Approach 1:
The patent applies partial or excessive action by extending the setup time of the enable signal only when necessary to ensure data integrity. The microcomputer monitors data transmission by comparing written data with read-back data from the LCD module's storage unit, and only extends the setup time when discrepancies are detected or when thermal conditions suggest potential data corruption. This selective extension maintains display update speed during normal operation while ensuring accuracy when problems occur.
Data Source
AI summary
An image forming apparatus and a method of controlling the same which may prevent brokenness of data displayed on a display are provided. The image forming apparatus performs a read operation on data previously stored at a specific address of a storage unit of an LCD module or on data stored through a write operation. The image forming apparatus compares data acquired through the read operation and known data. If the data acquired through the read operation and the known data are different, the image forming apparatus adjusts a setup time of an enable signal to prevent brokenness of data due to incorrect timing of the enable signal.