Optical Touch Panel Dynamic Light Intensity Control
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Solution Overview
Problem
Optical touch panels with scanning functionality require high light intensity for clear image acquisition, leading to excessive power consumption and user discomfort due to harsh visible light emission, especially in portable devices.
Innovation Solution
The optical touch panel incorporates a light source unit that selectively emits at two different intensities based on operation modes, switching from a lower intensity touch control mode to a higher intensity scan mode, and automatically adjusts based on detected shadows or user input, thereby reducing power usage and ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light source emits high intensity light for scan function, then clear object image can be obtained, but power consumption increases and user comfort decreases
Solution Approach 1:
The patent implements dynamic light intensity adjustment by switching between first light intensity (lower) for touch control mode and second light intensity (higher) for scan mode. The light source intensity is not fixed but adapts to the current operational mode, resolving the contradiction between maintaining clear image quality and reducing power consumption.
Solution Approach 2:
The patent changes the physical parameter of light intensity based on operational requirements. By adjusting the light intensity parameter from high to low depending on whether the system is in scan mode or touch control mode, the patent achieves both clear imaging when needed and power savings when not needed.
2Productivity
If the light source emits high intensity visible light, then scan function can be performed, but user comfort decreases due to harsh light
Solution Approach 1:
The system dynamically adjusts light intensity based on operational mode. During touch control mode, the light source emits at lower intensity to avoid user discomfort, while switching to higher intensity only when scan function is actively required, thus balancing productivity and user comfort.
Solution Approach 2:
The light source operates periodically at high intensity only during scan operations rather than continuously. This periodic activation ensures scan function capability is maintained when needed while minimizing exposure to harsh light, thereby reducing user discomfort during non-scan periods.
3Reliability
If the light source maintains high intensity continuously, then scan function is always available, but power consumption increases affecting device usage time
Solution Approach 1:
The patent implements dynamic light intensity control where the light source switches between first light intensity (lower) and second light intensity (higher) based on the current mode. This ensures scan function availability when needed while minimizing power consumption during touch control mode, thereby extending device usage time.
Solution Approach 2:
The light intensity parameter is changed from continuously high to mode-dependent (low during touch control, high during scan). This parameter adjustment maintains scan function reliability when required while significantly reducing overall power consumption to extend battery life and device usage time.
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 reduces power consumption by minimizing light intensity in scan mode, prolongs device usage time, and mitigates user discomfort by adjusting light emission according to operational needs, ensuring efficient energy use and user comfort.
Implementation Method 1
a light source unit (22) for emitting light having a first light intensity or a second light intensity selectively
Implementation Method 2
the light emitted by the light source is blocked at the region where the object is placed, wherein part of the light is reflected by the object and then enters the light detector. The touch panel is capable to realize the object existing in which part of the region by sensing the reflected light.
Data Source
AI summary
An optical touch panel includes a light source unit and a processing unit, wherein the processing unit is for executing a brightness control method. The brightness control method includes steps below. The light source unit emits at a first intensity in a touch control mode. Responding to a switching condition, the touch panel is switched into a scan mode, and the light source unit emits at a second intensity in the scan mode.