Touch Panel Control Device Signal Segmentation
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Solution Overview
Problem
Touch panels with increased digital signal bit length lead to decreased processing speed, unnecessary power consumption, and imprecise touch position calculations due to changes in wiring resistances, especially in display function-equipped coordinate input devices and mobile telephones.
Innovation Solution
A touch panel control device that converts digital signals from touch panels with higher bit lengths to shorter bit lengths, allowing for reduced processing requirements and precise touch position calculation, while also implementing measures to prevent accidental mode transitions and optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel resolution is increased to provide higher coordinate precision, then the bit length of the digital signal increases, but the processing speed of the touch panel control device decreases
Solution Approach 1:
The patent divides the 10-bit digital signal into two separate 5-bit signals, each representing one coordinate axis. This segmentation allows the system to process coordinates in smaller chunks, maintaining high resolution while reducing the computational burden on the control device, thereby preserving processing speed despite high coordinate precision requirements
Solution Approach 2:
The patent transforms the problem from processing a single 10-bit signal to processing two separate 5-bit signals in parallel. This dimensional change in data structure allows the system to achieve the same coordinate precision while reducing the complexity of individual processing operations, thus maintaining processing speed
2Ease of operation
If the display function is continuously operated to provide user interface functionality, then the user experience is maintained, but the power consumption increases
Solution Approach 1:
The patent implements dynamic switching between normal operation mode and low power consumption mode based on user interaction detection. The system adapts its operational state in real-time, maintaining full functionality when needed and reducing power consumption during idle periods, thus balancing user interface functionality with power efficiency
Solution Approach 2:
The patent changes the operational parameters of the display function by switching between different modes (normal and low power). This parameter change allows the system to maintain user interface functionality when required while significantly reducing power consumption during idle periods, effectively resolving the contradiction between functionality and energy usage
3Loss of energy
If the low power consumption mode is activated to reduce energy usage, then the power consumption decreases, but the processing speed and responsiveness may be affected
Solution Approach 1:
The patent uses periodic detection of user-specified operations to determine when to switch between operational modes. This periodic monitoring ensures that the system remains responsive to user input while spending most time in the lower power consumption state, thus minimizing energy loss without significantly impacting overall responsiveness
4Speed
If the digital signal bit length is reduced to improve processing speed, then the processing speed increases, but the coordinate resolution decreases
Solution Approach 1:
The patent segments the high-resolution coordinate data into multiple lower-resolution components that can be processed independently and more quickly. By dividing the 10-bit signal into two 5-bit signals, the system achieves faster processing while maintaining the ability to represent high-resolution coordinates through the combination of segmented data
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances processing speed, reduces power consumption, and improves touch position accuracy by converting digital signals and controlling device modes based on user input, thereby addressing the issues of increased bit length and power wastage.
Implementation Method 1
an analog resistive touch panel has two resistive films for respectively detecting an X-axis position and a Y-axis position, and detects a touch position by means of resistance division of the resistive films for the X axis and the Y axis
Data Source
AI summary
In order to restrict a decrease in processing speed due to an increase in bit length of a digital signal, a mobile telephone (1001) receives an input of a digital signal having a predetermined bit length indicating a coordinate of a user-specified position on an input surface of a touch panel (1300) in a predetermined resolution from the touch panel (1300) and converts the received digital signal into a digital signal having a bit length shorter than the predetermined bit length indicating the coordinate of the user-specified position on the input surface in a resolution lower than the predetermined resolution. The digital signal after conversion is used for a process of acquiring the user-specified position.