Light Pointing Device Clock-Synchronized Flashing for Power Reduction
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Solution Overview
Problem
Traditional touch panels in mobile devices face challenges with power consumption when using auxiliary light sources or light pens, which affects their operational duration due to high power usage.
Innovation Solution
A light pointing device with a signal receiving interface and a light emitting component that generates an intermittent flashing light source, synchronized with the system signal's reference clock cycle, reducing power consumption by only illuminating during effective sensing times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light pen uses continuous illumination to ensure proper operation under any environment, then the touch panel can recognize the actual input location accurately, but the power consumption increases significantly
Solution Approach 1:
The light pen emits light periodically at the same frequency as the display refresh rate, synchronized with the display panel's scanning process. This allows the display panel to detect light touch signals during specific time windows when the light pen is illuminated, while the light pen remains off during other periods to conserve power.
Solution Approach 2:
The system synchronizes the light pen activation with the display panel's scanning cycles in advance. The light pen is activated only during the periods when the display panel is actively scanning and sensing, ensuring that touch signals are detected during effective sensing windows without requiring continuous illumination.
2Ease of operation
If the light pen illuminates continuously to maintain visibility and responsiveness, then the user interface remains responsive at all times, but the operational duration of mobile devices decreases
Solution Approach 1:
The light pen operates in periodic pulses synchronized with the display refresh cycle, remaining inactive during non-sensing periods. This maintains interface responsiveness during active scanning windows while extending battery life by eliminating unnecessary continuous illumination.
3Adaptability or versatility
If the light pen is activated to provide excess light for touch detection, then the touch panel can operate in low light environments, but the power consumption of the mobile device increases
Solution Approach 1:
The light pen provides illumination only during display refresh cycles when the display panel is actively sensing touch input. This synchronized periodic operation enables the system to adapt to various lighting environments while minimizing power consumption by activating the light pen only when sensing occurs.
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
This approach significantly reduces power consumption, extending the operational period of the light pointing device by ensuring the light is only on when needed, thereby improving battery life in mobile applications.
Implementation Method 1
a light emitting component for generating an intermittent flashing light source, wherein the intermittence cycle of the flashing light source is synchronized with the reference clock cycle of the system signal
Data Source
AI summary
A light pointing device employed in an input apparatus comprises a signal receiving interface and a light emitting component. The signal receiving interface is used to receive a system signal from the input apparatus. The light emitting component can generate a flashing light source whose intermittence cycle is synchronized with the reference clock cycle of the system signal. Furthermore, the ratio of the intermittence cycle of the flashing light source to the reference clock cycle of the system signal is a natural number.