Wall Keypad Reflector Layout for Hidden Ambient Light Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wall-mounted keypads struggle with distinguishing actively selected buttons from unselected buttons due to ambient light, and aesthetic solutions like lens-based light detectors are unappealing.
Innovation Solution
A control device with a light detector circuit housed inside, using a photodiode to measure ambient light levels, and a reflector to focus light onto the detector, adjusting backlight intensity based on measured light levels to enhance button visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a lens-based light detector is installed on the faceplate to measure ambient light, then the light detection function is achieved, but the aesthetic appearance deteriorates
Solution Approach 1:
The light detector is extracted from the faceplate and relocated to the interior of the control device. The aperture in the lower wall allows light to enter the interior where the detector is positioned, separating the detection function from the aesthetic faceplate surface.
Solution Approach 2:
A reflector is introduced as an intermediary component to redirect light from the aperture to the light detector. The reflector ensures that light entering through the hidden aperture is properly directed onto the detector while keeping the detector itself hidden from external view.
2Illumination intensity
If backlight intensity is increased to improve button visibility in ambient light, then button distinction improves, but energy consumption increases
Solution Approach 1:
The backlight intensity is made dynamic rather than static. The control device automatically adjusts the backlight intensity based on the ambient light level detected by the light detector, increasing brightness in dark environments and decreasing it in bright environments to optimize both visibility and energy efficiency.
Solution Approach 2:
A feedback loop is established where the light detector continuously monitors ambient light conditions and provides information to the control circuit, which then adjusts the backlight intensity accordingly. This closed-loop system ensures optimal button visibility while minimizing energy consumption.
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 button distinction and aesthetic appeal by dynamically adjusting backlight intensity based on ambient light conditions, ensuring clear button selection even in varying lighting environments.
Implementation Method 1
The light detector circuit may be, for example, a photodiode
Implementation Method 2
The reflector may include a reflective surface that is configured to direct ambient light onto a light-receiving surface of the light detector circuit
Data Source
AI summary
A wall-mounted keypad may include a light detector circuit located inside the keypad that is configured to measure an ambient light level in a space. The light detector circuit may receive ambient light through an aperture that is hidden from view by the keypad. The keypad may include a reflector for directing ambient light onto the light detector circuit. The keypad may include an enclosure that houses the light detector circuit. The enclosure may define a recess that exposes at least a portion of the light detector circuit. The enclosure may include a reflector that may focus ambient light received through the aperture onto the light detector circuit. The keypad may include a control circuit that may be configured to illuminate the indicia of respective buttons of the control device in response to actuations of the one or more buttons, in accordance with the measured ambient light level.