Test or calibration of displayed greyscales
First Claim
1. A system for testing a display, comprising a test generator arranged to display a series of test patterns, each at a different luminance or colour, and with a predetermined minimum difference of luminance or colour from their background, each pattern being unpredictable to a user, and having a test evaluator arranged to determine and record if the user has correctly identified each of the patterns, wherein the test generator is arranged to display alongside each displayed test pattern a selection of candidate patterns for the user to choose a matching pattern.
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Abstract
Testing a display involves display of a series of test patterns, each at a different luminance or color, and with a predetermined minimum difference of luminance or color from their background, each pattern being unpredictable to a user, and determining if the user has correctly identified the patterns. This can enable a more objective test without needing external measuring equipment. Calibrating the display involves determining an output luminance level by detecting a minimal difference of drive signal to give a just noticeable output luminance difference at a given high luminance drive level, and determining an absolute luminance of the given high input luminance level from the minimal difference and from a predetermined human characteristic of visibility threshold of luminance changes. This can avoid the need for an external or internal sensor. This can be useful during conformance checks or during calibration of the display for example.
41 Citations
11 Claims
- 1. A system for testing a display, comprising a test generator arranged to display a series of test patterns, each at a different luminance or colour, and with a predetermined minimum difference of luminance or colour from their background, each pattern being unpredictable to a user, and having a test evaluator arranged to determine and record if the user has correctly identified each of the patterns, wherein the test generator is arranged to display alongside each displayed test pattern a selection of candidate patterns for the user to choose a matching pattern.
- 10. A method of testing a display comprising the steps of displaying a series of test patterns, each at a different luminance or colour, and with a predetermined minimum difference of luminance or colour from their background, each pattern being unpredictable to a user, and determining and recording if the user has correctly identified each of the patterns, wherein displaying the series of test patterns includes displaying alongside each displayed test pattern a selection of candidate patterns for the user to choose a matching pattern.
Specification