Display Panel Luminance Measurement Using Segmented Camera Capture
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Solution Overview
Problem
Measuring and compensating the light emission status of large display panels is challenging due to their size, making it difficult to capture a complete image in a single frame, which affects the accuracy of luminance measurement and leads to issues like image sticking in OLED displays.
Innovation Solution
A method using a camera with a smaller shooting range that divides the display panel into smaller regions, captures recognition pattern and single-color images, modifies the shots to account for angle errors and relative distances, and combines them to generate a whole single-color shot, allowing for compensation of light emission status by adjusting current to pixels based on luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a camera is used to capture the entire display panel in a single frame, then the measurement process is simple and fast, but the camera shooting range must be larger than the display panel size, which increases device cost and complexity
Solution Approach 1:
The display panel is divided into multiple divided regions, each smaller than the camera's shooting range. The camera captures images of each divided region separately, and the system synthesizes these partial images to generate a complete luminance map of the entire display panel. This segmentation approach allows using a camera with limited shooting range while still measuring the entire large display panel.
2Device complexity
If the display panel is divided into multiple regions and captured separately, then the camera shooting range requirement is reduced, but the measurement process becomes more complex and time-consuming
Solution Approach 1:
Recognition patterns are displayed on each divided region before capturing single-color images. These recognition patterns contain positioning information that enables the system to pre-determine the location and orientation of each captured image. This preliminary action of displaying recognition patterns simplifies the subsequent image synthesis process by providing automatic alignment references, reducing the overall process complexity despite multiple capture steps.
Solution Approach 2:
The system uses the recognition patterns captured in each divided region to provide feedback for adjusting and synthesizing the complete luminance map. The positioning information from recognition patterns feeds back into the image synthesis algorithm, enabling automatic alignment and stitching of multiple captured regions without manual intervention, thereby reducing process complexity.
3Measurement precision
If recognition patterns are used for positioning and alignment, then the accuracy of luminance measurement is improved, but the measurement process requires additional steps and time
Solution Approach 1:
The recognition pattern capture and single-color image capture are merged into a unified measurement process. The recognition patterns are displayed temporarily to establish positioning and alignment, then the same camera captures both the recognition patterns and the actual luminance data in a coordinated sequence. This merging allows the positioning information and luminance measurement to be obtained together, reducing the total time compared to separate operations.
Data Source
AI summary
A method of measuring light emission of a display panel and a method of compensating light emission of a display panel are disclosed. In one aspect the method of measuring light emission includes setting a location of a camera such that a imaging range area of the camera includes a first divided region among a plurality of divided regions, wherein the display panel is larger than the imaging range area of the camera and includes the divided regions, and wherein each of the divided regions is smaller than the imaging range area; first displaying a recognition pattern image on the first divided region. The method also includes shooting the first divided region by the camera so as to generate a recognition pattern shot; second displaying a single-color image on the first divided region.