LUMINANCE MEASURING DEVICE FOR LIQUID CRYSTAL DISPLAY

• US 20030184738A1
• Filed: 03/31/2003
• Published: 10/02/2003
• Est. Priority Date: 03/29/2002
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Yamaguchi, Akira
• Granted Patent: US 6,657,712 B2
• Time in Patent Office: Days
• US Class Current: 356/213
• CPC Class Codes: G01J 1/0271 Housings; Attachments or accessories for photometers
• CPC Class Codes: G01J 1/32 adapted for automatic variation of the measured or reference value regulation of light intensity G05D25/00
• CPC Class Codes: G02F 1/1309 Repairing; Testing
• CPC Class Codes: H04N 17/04 for receivers

Abstract

A luminance measuring device for a LCD includes a photometric unit having a contact type luminance meter, a light shielding cushion member surrounding a vicinity of a light receiving portion of the contact type luminance meter and a holding unit for fixing the contact type luminance meter to the LCD a converting unit for converting a first luminance measurement result by the contact type luminance meter into a second luminance measurement result corresponding to a telescopic luminance meter and a processing unit for conducting conversion processing using the converting unit to a luminance measurement result of the LCD by the photometric unit.

Claims

1. A luminance measuring device for a liquid crystal display comprising:

photometric means including;

a contact type luminance meter;

a light shielding cushion member surrounding a vicinity of a light receiving portion of the contact type luminance meter; and

holding means for fixing the contact type luminance meter to the liquid crystal display such that the light shielding cushion member lightly presses onto a display surface of the liquid crystal display and a relationship between an orientation of a light receiving portion of the contact type luminance meter and an orientation of the liquid crystal display is kept constant;

converting means for converting a first luminance measurement result by the contact type luminance meter into a second luminance measurement result corresponding to a telescopic luminance meter, said converting means previously being prepared from the first luminance measurement result by the contact type luminance meter and the second luminance measurement result by the telescopic luminance meter; and

processing means for conducting conversion processing using the converting means to a luminance measurement result of the liquid crystal display by the photometric means.

2. The luminance measuring device according to claim 1, wherein said converting means is set for each kind of liquid crystal display, and said processing means selects said converting means corresponding to one kind of liquid crystal display as a measurement subject and conducts said conversion processing.