Display screen inspecting apparatus

Details Display screen inspecting apparatus Display screen inspecting apparatus

1992-06-23

1994-03-08

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345DIG4, 348 92, G09G 336

Patent

active

052931781

ABSTRACT:
A display screen inspecting apparatus is for inspecting a display screen of a liquid crystal display having image density which changes in proportion to change of a driving voltage applied to the display screen. A driving voltage changing device changes the driving voltage to actuate the display screen, an image pick-up device picks up an image of a displaying state of the display screen driven with different driving voltages, a storage device stores image data related to the image density of images picked up by the image pick-up device when different driving voltages are applied to the display screen, an image density ratio operating/storing device determines and stores a ratio of the image density of the images stored by the storage device, and a deciding device decides whether the display screen is acceptable or unacceptable on the basis of change of the image density ratio.

REFERENCES:
patent: 4734688 (1988-03-01), Adams
patent: 4870357 (1989-09-01), Young et al.
patent: 5081687 (1992-01-01), Henley et al.
patent: 5136373 (1992-08-01), Kamiya et al.

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