Method and apparatus for testing color sequential, near-to-the-eye, and similar display devices
First Claim
1. An apparatus for testing a liquid crystal display (LCD) device, comprising:
- a light emitting device (LED) arranged to side-illuminate the LCD device such that a gradient of light is produced across the LCD device;
a camera device arranged to capture an image of the LCD device that is positioned axially from the device such that a portion of the gradient of light reflected from the LCD device is received by the camera device; and
a controller configured to analyze a set of criteria applied to the image of the LCD device according to a test sequence, and determine whether the LCD device meets the set of criteria.
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Abstract
A test method and apparatus for liquid crystal display (LCD) devices, and in particular LCoS (liquid crystal on silicon) display devices, to achieve a pass/fail determination based upon user-defined tolerances of the LCD devices. The test apparatus side-illuminates the LCD device to provide reliable pixel defect detection and uniformity measurement. The test method is adaptable for LCD devices that have light emitting devices (LEDs) integrated into the LCD or separated from the LCD. The side-illumination provides a gradient of brightness that is further discernable into red, green, and blue colors. A monochromatic image can be driven by the LEDs using one of two drive schemes. The first drive scheme illuminates a single color according to a monochrome test mode. The second drive scheme drive a white image with a single LED illuminated such that a monochromatic image results. A module can reorder the testing according to the rate of failures for each test.
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Citations
30 Claims
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1. An apparatus for testing a liquid crystal display (LCD) device, comprising:
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a light emitting device (LED) arranged to side-illuminate the LCD device such that a gradient of light is produced across the LCD device;
a camera device arranged to capture an image of the LCD device that is positioned axially from the device such that a portion of the gradient of light reflected from the LCD device is received by the camera device; and
a controller configured to analyze a set of criteria applied to the image of the LCD device according to a test sequence, and determine whether the LCD device meets the set of criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30)
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14. A method of achieving a pass/fail determination for a liquid crystal display (LCD) according to a set of predetermined characteristics, comprising:
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side-illuminating the LCD using a package of light emitting devices (LEDs) wherein each LED has a different color;
capturing an image of the LCD with a camera device wherein the captured image corresponds to light reflected from the LCD in response to the side-illumination;
analyzing the image of the LCD according to the set of predetermined characteristics; and
producing the pass/fail determination in response to the analysis of the image of the LCD.
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25. An apparatus for producing a pass/fail determination for a liquid crystal display (LCD) according to user-defined tolerances, comprising:
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a means for side-illuminating the LCD is arranged to side-illuminate the LCD using a package of light emitting devices (LEDs) wherein each LED has a different color;
a means for capturing an image of the LCD is arranged to capture an image of the LCD with a camera device wherein the image corresponds to light reflected from the LCD in response to the side-illumination;
a means for analyzing the image of the LCD is arranged to analyze the image of the LCD according to the set of predetermined characteristics; and
a means for producing the pass/fail determination is arranged to produce the pass/fail determination in response to the analysis of the image of the LCD.
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Specification