Luminance Measurement for Display Panels Using Segmented Imaging
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Solution Overview
Problem
Existing luminance measurement methods for display panels are inaccurate due to overlapping pixel images on the camera's imaging surface caused by lens aberration and other factors, which complicates the measurement of pixel luminance and subsequent image quality adjustment.
Innovation Solution
A method and device that calculate central and peripheral exposure factors by imaging each pixel to ensure they do not overlap, allowing for accurate luminance measurement and correction data generation to address luminance unevenness in display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all pixels are imaged simultaneously using a camera, then the measurement process is efficient and fast, but pixel images overlap due to lens aberration making accurate luminance measurement impossible
Solution Approach 1:
The patent divides the imaging process into two distinct phases: first imaging all pixels simultaneously to capture the display panel's overall luminance characteristics, then separately imaging individual pixels to obtain precise luminance data for each pixel position. This segmentation allows the system to benefit from both the efficiency of bulk imaging and the precision of individual pixel measurement, resolving the contradiction between measurement speed and accuracy.
Solution Approach 2:
The patent performs preliminary imaging of all pixels simultaneously to establish a reference map of pixel positions and their corresponding picture elements on the imaging surface. This preliminary action enables the subsequent individual pixel imaging to be more efficient and accurate, as the system already knows where each pixel's image should fall on the sensor, allowing for precise luminance measurement even when some overlap occurs.
2Loss of information
If pixel images are imaged to cover multiple picture elements, then the luminance distribution across the pixel can be captured, but adjacent pixel images overlap making it difficult to isolate individual pixel luminance
Solution Approach 1:
The patent segments the luminance measurement process into two components: a wide-field measurement that captures luminance distribution across multiple picture elements for each pixel, and a targeted measurement that isolates individual pixel images. By combining these segmented measurements with computational processing, the system recovers both the luminance distribution information and precise individual pixel luminance values, even when images overlap.
Solution Approach 2:
The patent introduces computational processing as an intermediary between the imaging process and the final luminance measurement. The system uses algorithms to separate overlapping pixel images, remove the influence of adjacent pixels, and reconstruct accurate luminance values for each pixel. This computational intermediary enables the system to extract precise measurements from overlapping images that would otherwise be unusable.
3Device complexity
If correction data is generated based on overlapping pixel images, then the process is simpler and faster, but the correction accuracy deteriorates due to adjacent pixel interference
Solution Approach 1:
The patent segments the correction data generation process into distinct stages: first generating correction data from the simultaneous imaging of all pixels to address overall luminance uniformity, then generating additional correction data from individual pixel imaging to address precise pixel-level variations. This segmented approach maintains relative simplicity while significantly improving correction accuracy by eliminating adjacent pixel interference through separate measurement passes.
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
Enables precise measurement and correction of luminance unevenness in display panels, even when pixel images overlap, thereby improving image quality by generating accurate correction data for display panels.
Implementation Method 1
a camera provided with a solid-state image sensor
Data Source
AI summary
Provided is a luminance measurement method for accurately measuring luminance of each pixel even if pixel images of a display panel overlap each other on an imaging surface of a camera. A central exposure factor indicating luminance of the central part of the pixel image is calculated on the basis of an output of a picture element corresponding to the central part. A peripheral exposure factor indicating luminance of the peripheral part of the pixel image is calculated on the basis of an output of picture elements corresponding to the peripheral part of the pixel image is calculated, all pixels of the display panel are sorted into a plurality of groups, sequentially turned on one group after another, and imaged by the camera, and the luminance of all the pixels of the display panel is calculated based on this imaged image, the central exposure factor, and the peripheral exposure factor.