Touchscreen Module Calibration via Display EDID Memory
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The calibration of touchscreen modules, especially when installed in new terminals, is inefficient and time-consuming due to variations between modules, and existing solutions requiring special non-volatile memory may not be compatible with all hardware and software configurations.
Innovation Solution
Storing calibration parameters in non-volatile memory associated with the display, using an Extended Display Identification Data (EDID) structure, where the calibration data is stored in a memory portion invisible to the display controller, allowing for pre-manufactured calibration parameters to be read directly without altering the touch panel controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If calibration parameters are stored in a special non-volatile memory associated with the touch panel, then calibration can be performed automatically without manual intervention, but compatibility with existing hardware and software is reduced
Solution Approach 1:
The patent applies universality by using the display's existing non-volatile memory (designed for EDID storage) to also store touch panel calibration parameters. This allows the same memory component to serve multiple functions: storing display identification data and storing calibration parameters, thereby avoiding the need for special dedicated memory while achieving automatic calibration.
Solution Approach 2:
The patent merges the calibration parameter storage function with the display's existing non-volatile memory system. By combining these functions in a single memory component, the invention eliminates the need for separate special memory hardware while maintaining automatic calibration capability and ensuring compatibility with existing display drivers and hardware.
2Adaptability or versatility
If manual calibration is performed for each new touchscreen module installation, then compatibility with existing systems is maintained, but installation time and efficiency are reduced
Solution Approach 1:
The patent applies preliminary action by pre-storing calibration parameters in the display's non-volatile memory during manufacturing. This allows the touchscreen module to be ready for immediate use upon installation without requiring time-consuming manual calibration procedures, while the parameters are automatically retrieved by the system.
3Adaptability or versatility
If calibration parameters are stored in display-associated non-volatile memory, then compatibility with existing hardware and software is maintained, but the memory must be extended beyond standard EDID capacity
Solution Approach 1:
The patent applies dimensionality change by utilizing the extension block feature of the EDID data structure. The extension flag, normally used to indicate additional display capability data, is repurposed to indicate the presence of calibration parameters. This allows the system to access calibration data in an extended memory region without requiring fundamentally new memory hardware or complex addressing schemes.
Data Source
AI summary
A touchscreen module comprises a display for presenting information to a user of the touchscreen module; a touch panel mounted in overlapping relationship with the display; a touch panel controller coupled to the touch panel for detecting a point on the touch panel touched by the user; and non-volatile memory associated with the display. The non-volatile memory includes a first memory portion for storing information relating to the display, and a second memory portion for storing calibration data relating to the touch panel, thereby enabling calibration data to be retrieved from the touchscreen module when the touchscreen module is installed in a terminal.