Electronic Timepiece Light Emitting Section Gradual Brightening Control
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Solution Overview
Problem
Conventional electronic timepieces with high-brightness light emitting elements cause user discomfort due to sudden light dazzling in dark environments, as they do not gradually adjust light emission to prevent eye strain.
Innovation Solution
An electronic timepiece with a light emitting control system that gradually increases the light emission to a peak value over a predetermined brightening time and then decreases it to turn off, using Pulse Width Modulation (PWM) control to manage the light emitting element's power supply, ensuring a gentle and effective illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-brightness light emitting elements are used to improve visibility, then illumination intensity is improved, but user comfort deteriorates due to sudden light dazzling
Solution Approach 1:
The light emitting element's output is made dynamic by gradually increasing brightness from low to high levels over time, rather than switching abruptly. The control section adjusts the light emitting amount in steps during a predetermined period, allowing the eye to adapt progressively to the illumination level, thus eliminating sudden dazzling while achieving full brightness for good visibility.
Solution Approach 2:
The system performs preliminary action by pre-warming the light output before reaching full intensity. The control section increases the light emitting amount gradually in advance, allowing the user's eyes to adapt to the increasing brightness before peak illumination is achieved, preventing discomfort from sudden light exposure.
2Speed
If light emitting amount is increased rapidly to improve response speed, then illumination speed is improved, but user comfort deteriorates due to eye strain
Solution Approach 1:
The light output is made dynamic through controlled gradual increase rather than abrupt switching. The control section manages the light emitting element to increase brightness progressively within a predetermined time frame, balancing speed with comfort by preventing sudden changes that cause eye strain while still providing timely illumination.
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
The solution reduces user discomfort by preventing sudden light dazzling, providing gentle and effective illumination while maintaining good visibility, even with higher maximum light emitting amounts, without requiring additional hardware configurations, thus reducing manufacturing costs.
Implementation Method 1
a light emitting element 55a (light emitting section) which illuminates the hands and face 3 from a lateral side
Data Source
AI summary
An electronic timepiece includes a display section which displays time information and a light emitting section which illuminates a display surface of the display section by emitting light. A light emitting control section performs control to turn on the light emitting section by gradually increasing a light emitting amount of the light emitting section to a peak value in a predetermined brightening time according to a predetermined light emitting condition.