Display Calibration via Sequential Pixel Illumination
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Solution Overview
Problem
Measuring and calibrating high-resolution electronic visual displays is impractical due to the need for expensive, high-resolution imaging devices and additional equipment for aligning and moving cameras, which can lead to mismatches and discontinuities in measurement.
Innovation Solution
A method and system that use a pattern generator to illuminate only a subset of pixels or subpixels, allowing a lower-resolution imaging device to measure and calibrate the display by shifting patterns until all pixels are measured, eliminating the need for expensive equipment and reducing measurement mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-resolution imaging device is used to measure individual pixels, then measurement precision is improved, but device cost and complexity increase
Solution Approach 1:
The display is divided into multiple sections, and each section is measured separately using a lower-resolution imaging device. The measurement patterns are selectively displayed to illuminate only specific sections at a time, allowing accurate measurement of individual pixels without requiring a high-resolution device capable of capturing the entire display simultaneously.
Solution Approach 2:
The measurement approach transitions from spatial resolution (using a high-resolution device to capture all pixels at once) to temporal sequencing (using a lower-resolution device to measure sections sequentially over time). This dimensional shift allows accurate pixel measurement while reducing device complexity.
2Area of stationary object
If additional equipment is used for aligning and moving cameras, then measurement coverage is improved, but device complexity and alignment time increase
Solution Approach 1:
The display itself serves as the measurement tool by selectively illuminating different sections through programmed patterns. This eliminates the need for external equipment to physically move or reposition cameras, as the display's own pixel control capability is used to present different measurement targets to the stationary imaging device.
Solution Approach 2:
The imaging device performs multiple measurement functions by capturing different sections at different times. A single stationary device replaces what would otherwise require multiple devices or a complex moving system, as it can measure any section of the display through sequential pattern display.
3Productivity
If the entire display is measured at once, then productivity is improved, but measurement precision decreases due to mismatches and discontinuities
Solution Approach 1:
The display measurement is segmented into multiple sections measured sequentially rather than captured simultaneously. Each section receives focused measurement attention with appropriate lighting patterns, ensuring high precision for each segment while the overall process maintains reasonable productivity through automated sequential measurement.
Solution Approach 2:
The sequential measurement process maintains continuous useful action by immediately transitioning from one section measurement to the next without interruption. The automated pattern display and sequential capture ensure that the measurement process flows continuously, minimizing idle time and maintaining productivity despite the segmented approach.
Data Source
AI summary
The present disclosure relates to methods and systems for measuring and correcting electronic visual displays. A method in accordance with one embodiment of the present technology includes generating a series of patterns for illuminating proper subsets of the light emitting elements of the display, such as regular grids of nonadjacent activated light emitting elements with the elements in between deactivated. For each generated pattern, an imaging device captures information about the activated light emitting elements. A computing device analyzes the captured information, comparing the output of the activated light emitting elements to target output values, and determines correction factors to calibrate the display to better achieve the target output values. In some embodiments, the correction factors may be uploaded to firmware controlling the display or used to process images to be shown on the display.