Vehicular Lamp Sequential Winker Control Asymmetric Timing
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Solution Overview
Problem
Conventional vehicular turn signal lamps using sequential blink control methods often result in a poor impression of direction indication due to the speed of widening the lights-out area and repetition period of lighting control.
Innovation Solution
A lighting control device and method that prolongs the rise time of light-emitting parts from zero to full illumination and shortens the fall time from full to zero illumination, allowing for a longer lights-out state duration, enhancing the impression of direction indication by sequentially turning off light-emitting parts with a predetermined time difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential blink control is used to turn off light-emitting parts quickly, then the lighting cycle period is shortened and productivity is improved, but the impression of direction indication deteriorates
Solution Approach 1:
The patent applies dynamics by making the light emission characteristics change over time within each lighting cycle. Specifically, the rise time (turn-on duration) is set longer than the fall time (turn-off duration), creating a dynamic temporal pattern that enhances perceptibility. This dynamic timing adjustment allows the system to maintain clear direction indication while operating at higher cycling speeds.
Solution Approach 2:
The patent changes the temporal parameters of light emission by setting the rise time (e.g., 50-200ms) to be longer than the fall time (e.g., 10-50ms). This parameter adjustment creates an asymmetric light transition pattern that improves the visual impression of light movement. By optimizing these time parameters, the system achieves better direction indication without requiring slower cycling.
2Speed
If the lights-out area is widened quickly from inner side to outer side, then the sequential blink speed is increased, but the movement of light impression deteriorates
Solution Approach 1:
The patent applies dynamics by implementing asymmetric temporal characteristics for light transitions. The rise time (turn-on duration) is deliberately set longer than the fall time (turn-off duration), creating a dynamic pattern where light appears to gradually emerge and quickly disappear. This dynamic timing relationship enhances the perceptibility of light movement even when the sequential blink progresses rapidly across multiple light-emitting parts.
Solution Approach 2:
The patent applies preliminary action by ensuring that each light-emitting part completes its full rise time (gradual turn-on) before the next part begins its illumination sequence. This preliminary completion of the lighting phase ensures that the human eye can perceive the light emergence and movement, even as the overall sequential pattern moves quickly across the lamp structure.
Data Source
AI summary
A vehicular lamp can enhance the impression of the direction indication due to the movement of light when performing sequential winker controls by sequentially turning off a plurality of light-emitting parts. A lighting control device for performing lighting control of the vehicular lamp including the plurality of light-emitting parts, includes processor circuitry configured to perform controls to repeat a lighting cycle including turning on the plurality of light-emitting parts and maintaining a lighting state of all the light-emitting parts, and then sequentially turning off the light-emitting parts in a predetermined direction with a time difference and maintaining a lights-out state of all the light-emitting parts in such a manner that a rise time from the lights-out state to the lighting state during energizing the light-emitting parts is made longer than a fall time from when the lighting state to the lights-out state during deenergizing the light-emitting parts.