LED Flash Color Temperature Matching for Camera Ambience
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Solution Overview
Problem
Standard xenon flashes and current LED flashes do not match ambient light temperatures, leading to inaccurate color compensation in digital camera images, as they are not designed to work in conjunction with the camera's automatic color correction algorithms when both ambient light and flash contribute to illumination.
Innovation Solution
Customization of LED flashes using blue LED dies with varying red and green phosphor layers or quantum dots to match specific ambient light settings programmed into the camera, ensuring the flash light characteristics align with the camera's color compensation algorithms, thereby enhancing image color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a standard LED flash with fixed color temperature is used, then the flash provides sufficient illumination, but the color temperature does not match the ambient light causing inaccurate color compensation
Solution Approach 1:
The patent implements dynamic color temperature adjustment by controlling the intensity ratios of multiple LEDs with different color temperatures (warm white, neutral white, cool white) based on detected ambient light conditions. This allows the flash to adapt its spectral characteristics to match various ambient lighting scenarios, resolving the contradiction between providing sufficient illumination and achieving accurate color compensation.
Solution Approach 2:
The system changes the operational parameters of the flash by adjusting the drive currents to individual LEDs with different color temperatures. By varying the intensity contribution of each LED type according to the ambient light color temperature, the system transforms the flash output to match the ambient lighting conditions, thereby achieving both adequate illumination and accurate color representation.
2Manufacturing precision
If multiple LEDs with different color temperatures are used to match ambient light, then color accuracy improves, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by integrating multiple LEDs with different color temperatures into a single flash assembly that can adapt to various ambient lighting conditions. This universal design allows the same flash unit to serve multiple purposes: providing illumination across different environments while maintaining color accuracy, thereby managing complexity through functional integration rather than requiring separate flash units for each lighting condition.
Solution Approach 2:
The system employs self-service through automatic ambient light detection and autonomous adjustment of LED intensities. The camera's image processing unit detects the ambient light color temperature and automatically controls the relative intensities of the different colored LEDs without requiring manual intervention, thus managing the increased device complexity through automated control mechanisms.
3Productivity
If the flash dominates the ambient light, then the camera applies flash compensation algorithm, but the colors are not true when both flash and ambient light contribute significantly
Solution Approach 1:
The patent dynamically adjusts the flash output characteristics to match the ambient light color temperature, creating a more balanced illumination scenario. This dynamic adaptation allows the camera to more accurately determine the relative contributions of ambient light and flash, enabling more precise selection and application of color compensation algorithms, thereby improving color accuracy without sacrificing processing efficiency.
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 customized LED flashes effectively brighten ambient light and optimize color compensation algorithms, resulting in truer and more accurate color representation in photographs, particularly under incandescent, daylight, and fluorescent lighting conditions.
Implementation Method 1
LEDs are becoming increasingly popular for use as a flash for small cameras
Implementation Method 2
a standard blue LED die covered with a YAG phosphor, where the yellow-green light emitted by the YAG phosphor is combined with the blue LED light leaking through the phosphor layer to produce a white light
Data Source
AI summary
A white light LED flash (53) for a digital camera (50) is described that uses a blue light LED die (22) in conjunction with red and green phosphor or quantum dot material (40) over the LED die. The phosphor or quantum dot characteristics are selected so that the white light substantially matches an ambient light setting in the camera, such as the incandescent ambient light setting. Therefore, when a flash picture is taken under incandescent ambient light, and the flash emits the same type of light as the incandescent light, the flash will effectively brighten the incandescent light. The camera's color compensation algorithm (71) associated with incandescent light illumination is then applied to the photograph and works optimally since the object is only illuminated by incandescent light. This concept is expanded to LED flashes that emulate other types of ambient light having associated color compensation algorithms programmed into the camera.