Planar Camera Flash Layout for Softer Shadows in Low Light
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Solution Overview
Problem
Smaller camera flashes cast sharper shadows due to linear or point-like light sources, causing issues in photography, especially when capturing human faces in dark environments.
Innovation Solution
A light-emitting device with a planar light source configuration that includes a switching circuit for pulsed constant current, a light-emitting panel, and a driver circuit to output control pulse signals, allowing for a constant current pulse with a duration between 1 millisecond and 1000 milliseconds, and a flexible substrate for a curved housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of the flash is reduced for easy portability, then the device becomes smaller and lighter, but the light source becomes more linear or point-like which casts sharper shadows
Solution Approach 1:
The flash unit transitions from a conventional point-like or linear light source to a planar light source that emits light from a two-dimensional surface. This dimensional change allows the flash to maintain a compact form factor while providing area light characteristics that soften shadows, as the light originates from multiple points across a plane rather than a single point or line.
Solution Approach 2:
The planar light source is composed of multiple light-emitting elements arranged in a matrix pattern across the flash surface. Each element contributes to the overall light output, and their distributed arrangement creates area light effects that reduce shadow sharpness while maintaining a compact device size.
2Volume of moving object
If the flash size is reduced, then portability improves, but the light-emitting portion becomes linear or point-like causing sharper shadows
Solution Approach 1:
The flash unit transitions from a conventional point-like or linear light source to a planar light source that emits light from a two-dimensional surface. This dimensional change allows the flash to maintain a compact form factor while providing area light characteristics that soften shadows, as the light originates from multiple points across a plane rather than a single point or line.
3Object-affected harmful factors
If a planar light source is used to reduce shadows, then shadow quality improves, but the device complexity increases
Solution Approach 1:
The planar light source is constructed using flexible substrate materials that allow the light-emitting elements to be mounted on a thin, adaptable surface. This approach simplifies the overall device structure compared to rigid assemblies, as the flexible substrate can conform to different form factors and integrates easily with the camera housing.
Solution Approach 2:
Multiple light-emitting elements are integrated into a unified planar structure that functions as a single area light source. The control circuitry manages all elements collectively through pulse width modulation, combining their output to create the desired lighting effect while simplifying the control architecture compared to individually addressing each element.
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 provides a small, shadow-free light-emitting device that can be easily carried and used in various designs, offering high luminance and efficient heat dissipation, suitable for photography applications.
Implementation Method 1
Research and development have been extensively conducted on light-emitting elements using organic electroluminescence (EL)
Data Source
AI summary
A small light-emitting device is provided. A light-emitting device which is less likely to produce a shadow is provided. A structure including a switching circuit for supplying a pulsed constant current and a light-emitting panel supplied with the pulsed constant current has been conceived.