Touch Input Device Using Ambient-Adaptive Infrared Detection
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting touch inputs, particularly when using passive styluses, and in adapting image display to varying environmental lighting conditions.
Innovation Solution
A touch input device that includes a code detector emitting and receiving infrared light to detect code patterns on a display panel, with a code processor modulating emission control signals based on external light characteristics to enhance touch detection and image display adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive stylus is used for touch input, then the device structure is simpler and cost is reduced, but touch detection precision deteriorates
Solution Approach 1:
The patent introduces an active stylus as an intermediary device that contains infrared LEDs and a sensor. The stylus actively emits infrared light and detects reflected light from the display panel, serving as a mediator between the user and the display system. This active intermediary overcomes the limitations of passive styluses by providing its own light source and detection capability, thereby improving touch detection precision while maintaining relative structural simplicity.
Solution Approach 2:
The patent replaces mechanical/optical reflection-based passive stylus detection with an active optical system using infrared LEDs and sensors. Instead of relying on passive light reflection from the display panel, the system uses active infrared illumination and detection, substituting the passive mechanical/optical system with an active electronic-optical system that provides superior detection precision.
2Measurement precision
If infrared light emission intensity is increased to improve code detection, then detection precision is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic control of infrared LED emission intensity based on ambient light conditions. The controller adjusts the emission intensity of the infrared LEDs according to the detected ambient light level, making the system adaptive rather than static. This dynamic adjustment allows the system to use higher intensity only when necessary (in dark environments), thereby improving code detection precision while minimizing energy consumption in normal lighting conditions.
Solution Approach 2:
The patent changes the emission parameter (intensity) of the infrared LEDs based on ambient light conditions. By monitoring ambient light levels and adjusting the infrared LED current accordingly, the system optimizes the balance between detection precision and energy consumption, using higher intensity only when ambient light is insufficient.
3Illumination intensity
If display brightness is increased to improve visibility in bright environments, then display clarity is improved, but power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors ambient light conditions and adjusts the display panel brightness accordingly. When ambient light is high, the display brightness is increased to maintain visibility; when ambient light is low, brightness is reduced. This closed-loop feedback system optimizes the balance between display clarity and power consumption, ensuring the display adapts to environmental conditions rather than operating at fixed brightness levels.
Solution Approach 2:
The display brightness is made dynamic rather than static, automatically adjusting to ambient light conditions. The system transitions from a fixed brightness state to an adaptive brightness state that responds to environmental changes, optimizing both visibility and power consumption based on real-time conditions.
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
Improves touch input precision and dynamic image brightness adjustment in response to environmental lighting changes, enhancing user interaction and display clarity.
Implementation Method 1
a code detector emitting infrared light and receiving infrared light reflected from a display panel to detect code patterns of the display panel
Data Source
AI summary
A touch input device includes a communication module receiving external light characteristic information. A code detector emits infrared light and receives infrared light reflected from a display panel to detect code patterns of the display panel. A light emitting driver controls an infrared light emission operation of the code detector. A code processor modulates an emission control signal so that an infrared light emission characteristic of the code detector is changed according to a change in the external light characteristic information and controls driving of the light emitting driver.