Backlight Legend Brightness Measurement Using Uniform Illumination
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Solution Overview
Problem
Current brightness measuring methods for devices with backlight fail to accurately assess the brightness of legends due to non-uniform illumination, leading to incorrect calculations as pixels with lower brightness are misclassified as background, resulting in overestimation of total brightness.
Innovation Solution
A method and system that utilize a controlling device to capture base and comparison images, where a uniform light source is used initially to identify the legend pattern, followed by backlight illumination to calculate the brightness values of overlapping pixels, ensuring accurate measurement by differentiating legend and background pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the current brightness measuring method is used (photographing the illuminated legend and dividing based on pixel brightness and threshold), then the measurement process is simple, but the measurement precision deteriorates because pixels with lower brightness are misclassified as background, leading to overestimation of total brightness
Solution Approach 1:
The patent applies preliminary action by first capturing a base image with uniform illumination to identify the complete legend pattern before measuring brightness under backlight. This preliminary step establishes the true legend boundaries, preventing misclassification of dim pixels as background during subsequent brightness measurement. The base image serves as a reference map that guides accurate pixel selection in the comparison image.
2Measurement precision
If a uniform light source is introduced to capture a base image for pattern identification, then the measurement precision improves, but the device complexity increases due to additional light source and measurement steps
Solution Approach 1:
The uniform light source serves multiple functions: it illuminates the legend for pattern identification, provides reference brightness levels, and enables the capturing of the base image that defines legend boundaries. This multi-functionality justifies the addition of the light source, as it performs several critical tasks rather than adding complexity for a single purpose.
3Measurement precision
If the base image method is used to identify complete legend pattern, then the brightness measurement accuracy improves, but the measurement time increases due to additional image capture and processing steps
Solution Approach 1:
The patent extracts the legend pattern identification step from the brightness measurement process by using a separate base image captured under uniform illumination. This extraction allows the two functions (pattern identification and brightness measurement) to be performed independently and efficiently, rather than trying to accomplish both simultaneously in a single complex operation.
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
This approach allows for precise measurement of backlight brightness, avoiding overestimation and providing correct brightness evaluation, even under non-uniform illumination conditions, thus aiding in improving device structure design and backlight module performance.
Implementation Method 1
turning on a uniform light source external to the DUT so as to illuminate the DUT
Implementation Method 2
turning on a backlight source of the DUT, so as to let the backlight source illuminate the legend of the DUT
Data Source
AI summary
A brightness measuring method of device with backlight is performed by a controlling device, for measuring legends of backlight provided by a backlight module of a device under test (DUT). The method includes turning on a uniform light source external to the DUT for illuminating the DUT; capturing and receiving an image of the DUT illuminated with uniform light as a base image; identifying a complete pattern of a to-be-measured legend in the base image; turning off the uniform light source and turning on the backlight of the DUT so as to illuminate the legend of DUT; capturing and receiving an image of the DUT illuminated with backlight as a comparison image, wherein the scope of the comparison image overlaps the scope of the base image; and calculating brightness values of a plurality of pixels in the comparison image whose positions overlap the positions of the complete pattern.