Optical Touch Input Device Dynamic Infrared Light Output Control
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Solution Overview
Problem
Infrared type touchscreens consume unnecessary power and reduce the lifespan of light emitting sources due to continuous lighting, even when no touch input is detected, leading to increased power consumption and decreased accuracy over time.
Innovation Solution
An optical touch input device with infrared light emitting elements that adjust their optical output based on touch presence, switching to a low power mode when no touch is detected, using a light emission control unit to manage the infrared light emitting elements and reduce power consumption during non-touch periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrared light emitting sources continuously emit light to ensure touch detection accuracy, then touch detection reliability is improved, but power consumption increases and lifespan is reduced
Solution Approach 1:
The patent implements dynamic optical output adjustment where the infrared light emitting sources continuously emit light during touch operations to ensure detection accuracy, but reduce optical output during non-touch periods to minimize power consumption. This dynamic switching between high and low power modes resolves the contradiction between maintaining reliability and reducing energy usage.
Solution Approach 2:
The patent changes the operational parameters of the infrared light emitting sources by adjusting optical output levels based on touch detection state. A touch operation unit determines whether a touch is occurring and controls the light emitting sources to operate at full power during touch and reduced power during non-touch, thereby optimizing the balance between detection accuracy and power consumption.
2Reliability
If infrared light emitting sources continuously emit light, then touch detection function is maintained, but lifespan of light emitting sources is shortened
Solution Approach 1:
The patent implements periodic operation of the infrared light emitting sources by alternating between continuous emission during touch operations and reduced emission during non-touch periods. This periodic action pattern maintains the necessary touch detection function while significantly reducing cumulative operating hours and extending the lifespan of the light emitting sources.
3Use of energy by moving object
If infrared light emitting sources reduce optical output during non-touch, then power consumption is reduced, but touch detection accuracy may be affected
Solution Approach 1:
The patent employs a touch operation unit that continuously monitors the detection state and provides feedback control to the infrared light emitting sources. When a touch operation is detected, the system immediately restores full optical output to ensure accurate detection. This feedback mechanism ensures that reduced power consumption during non-touch does not compromise detection accuracy when needed.
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
Minimizes power consumption and extends the lifespan of light emitting sources while maintaining touch detection accuracy by reducing optical output during non-touch periods, thereby optimizing power usage and performance.
Implementation Method 1
a plurality of infrared light emitting elements disposed on two adjacent sides of the display panel
Implementation Method 2
a lens unit disposed on the remaining two adjacent sides of the display panel and reflecting light emitted from the plurality of infrared light emitting elements
Implementation Method 3
a light receiving unit disposed on the two adjacent sides of the display panel, and a touch control unit including a touch coordinate calculation unit to calculate a set of coordinates of a touch point according to data regarding light received by the light receiving unit
Data Source
AI summary
Disclosed are an optical touch input device which divisionally adjusts optical output of a light emitting unit before and during a touch operation to reduce power consumption, and a driving method thereof, the optical touch input device includes a display panel, a plurality of infrared light emitting elements disposed on two adjacent sides of the display panel, a lens unit disposed on the remaining two adjacent sides of the display panel and reflecting light emitted from the infrared light emitting elements, a light receiving unit disposed on the two adjacent sides of the display panel, and a touch control unit including a touch coordinate calculation unit to calculate a set of coordinates of a touch point and a light emission control unit to divide optical outputs of the infrared light emitting elements into optical output during touch and optical output during non-touch and to lower the optical output during non-touch.