| (19) |
 |
|
(11) |
EP 0 463 787 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
05.02.1992 Bulletin 1992/06 |
| (43) |
Date of publication A2: |
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02.01.1992 Bulletin 1992/01 |
| (22) |
Date of filing: 18.06.1991 |
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| (84) |
Designated Contracting States: |
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DE FR GB IT NL |
| (30) |
Priority: |
22.06.1990 GB 9013914
|
| (71) |
Applicant: TANTARA TEK LIMITED |
|
Watford WD1 7LA (GB) |
|
| (72) |
Inventor: |
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- Evans, Brian T.
Watford WD1 7LA (GB)
|
| (74) |
Representative: Robinson, John Stuart et al |
|
MARKS & CLERK,
Alpha Tower,
Suffolk Street Queensway
Birmingham, B1 1TT
Birmingham, B1 1TT (GB) |
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| |
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(57) s7 . A visual display has a flicker frequency which is higher than a critical flicker
fusion frequency for central vision so that, when viewed directly, no flicker is discernable.
The flicker frequency is less than a critical flicker fusion frequency for peripheral
vision so that flicker is at least subliminally apparent in the peripheral vision
in order to attract attention to the display. A suitable flicker frequency for many
purposes is 75 Hz.