Luminance Measurement Using N-Times Pixel Interval Scaling
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Solution Overview
Problem
The accuracy of luminance measurement in display panels decreases due to the aperture ratio of the image sensor camera, leading to measurement errors, especially when using cameras with aperture ratios lower than 100%, which are not suitable for high-definition displays.
Innovation Solution
A method involving an optical lens and image sensor with light receiving elements arranged at regular intervals, where the image intervals of pixels are set N times larger than the light receiving pixel intervals, allowing for accurate luminance measurement using a display pattern where only specific pixels produce luminescence, reducing errors caused by adjacent pixel luminescence and varying measurement conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an image sensor with aperture ratio lower than 100% is used for measurement, then the device complexity is reduced and ease of operation is improved, but the measurement precision deteriorates due to aperture ratio variations
Solution Approach 1:
The patent divides the measurement process into multiple discrete steps: (1) setting the display pattern with specific pixel arrangements, (2) adjusting distances to achieve N-times interval multiplication, and (3) calculating cumulative sums with exclusion criteria. This segmentation allows each step to be optimized independently, enabling accurate measurement even with imperfect aperture ratios.
Solution Approach 2:
The patent changes the spatial parameter by adjusting distances between the display panel, optical lens, and image sensor to set image intervals to N times the light receiving element intervals. This parameter adjustment creates a measurement geometry that compensates for aperture ratio variations, allowing accurate luminance measurement with non-ideal sensors.
2Device complexity
If cumulative sum of all light receiving elements in measurement region is calculated, then the measurement process is simplified, but measurement precision deteriorates due to inclusion of adjacent pixel luminescence and black stripe portions
Solution Approach 1:
The patent extracts and excludes specific portions from the cumulative sum calculation: (1) luminance values from light receiving elements corresponding to black stripe portions, and (2) luminance values from elements that would capture adjacent pixel luminescence. This extraction of harmful components maintains measurement simplicity while improving accuracy.
Solution Approach 2:
The patent applies different treatment to different regions of the measurement data: certain light receiving elements have their luminance values excluded while others are included in the cumulative sum. This local differentiation allows the measurement to account for the specific spatial arrangement of pixels and black stripes, improving precision without significantly increasing complexity.
3Measurement precision
If distances between display panel, image sensor, and optical lens are adjusted to set image intervals N times larger than light receiving element intervals, then measurement precision is improved, but the ease of operation deteriorates due to complex distance adjustment
Solution Approach 1:
The patent performs preliminary distance adjustment to establish the N-times interval relationship before actual luminance measurement. This preliminary action creates a stable measurement geometry that simplifies subsequent measurements, as the critical spatial relationship is established once and maintained throughout the measurement process.
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 method enables accurate luminance measurement of each pixel by eliminating measurement errors caused by aperture ratio variations, even with image sensors having aperture ratios lower than 100%, ensuring consistent measurement conditions across the light receiving elements.
Implementation Method 1
adjusting distances between the light-emitting display panel, the image sensor, and the optical lens by setting intervals of images of the entire pixels to be N times as large as intervals of the light receiving pixels, where N is a natural number, the images being to be formed on a light receiving surface of the image sensor through the optical lens
Implementation Method 2
measuring the luminance of the predetermined pixels that produce the luminescence, using the light receiving elements
Data Source
AI summary
Disclosed is a method for measuring luminance of each of entire pixels two-dimensionally arranged in a light-emitting display panel at regular intervals, using an image sensor in which light receiving elements are two-dimensionally arranged at regular intervals, the method including: providing an optical lens between the light-emitting display panel and the image sensor, and adjusting distances between the light-emitting display panel, the image sensor, and the optical lens by setting intervals of images of the entire pixels to be N times as large as intervals of the light receiving pixels, where N is a natural number, the images being to be formed on a light receiving surface of the image sensor through the optical lens; displaying, on the light-emitting display panel, a display pattern in which predetermined pixels from among the entire pixels produce a luminescence; and measuring the luminance of the predetermined pixels, using the light receiving elements.