Claims
- 1. A method for adjusting an overall luminosity of at least a part of a screen comprising cells arranged in rows and columns and configured to display half tones, comprising the steps of:applying to a first row a semi-selective operation followed by a selective operation, said selective operation being delayed from said semi-selective operation by a weighted delay time having a duration equal to a time interval between said application of said semi-selective operation and a next subsequent semi-selective operation multiplied by a factor k, said factor being chosen between 0 and 1 and being adjustable to the desired luminosity, and repeating said applying step non-periodically to said first row, in order to display an image with half tones, the duration of a first weighted delay time between a first selective operation and a first semi-selective operation being different from the duration of a second weighted delay time between a second selective operation and a second semi-selective operation for a same value of said factor.
- 2. The method of claim 1, further comprising the step of:interleaving said applying step and said repeating step for said first row with corresponding applying steps and repeating steps for at least a second row of said rows.
- 3. The method of claim 2, wherein said applying step comprises:applying said semi-selective operation which is from a first group of sub-scans; and applying said selective operation which is from a second group of sub-scans, wherein said first group of sub-scans and said second group of sub-scans are applied to all of said rows of said at least part of a screen in an ordered way.
- 4. The method of claim 3, wherein said interleaving step comprises:applying to a n order row a first sub-scan taken from the first group, applying to a m order row a second sub-scan taken from the second group, where m is different than n, applying to a p order row a third sub-scan taken from the first group, where p is different than n; applying to a q order row a fourth sub-scan taken from the second group, where q is different than m; applying to additional rows in a similar pattern each of the other remaining sub-scans from the first group and the second group until all of the sub-scans have been taken; and repeating said steps of applying to a n, m, p, q, and additional order rows for corresponding n+1, m+1, p+1, q+1 and further additional rows in a similar manner until each of the sub-scans has been applied to corresponding rows of said part of the screen at least once.
- 5. The method of claim 1, wherein said applying step comprises:applying said selective operation to record a bit value on one of the cells; and applying said semi-selective operation to erase one of the cells.
- 6. The method of claim 1, wherein said applying step comprises:applying said semi-selective operation to record a bit value on one of the cells; and applying said selective operation to erase one of the cells.
- 7. The method of claim 1, wherein said applying step comprises applying said semi-selective operation and said selective operation to a first row of a plasma panel.
- 8. The method of claim 1, wherein said applying step comprises applying the semi-selective operation and the selective operation to a first row of a liquid crystal display.
- 9. An adjustable half-tone display system comprising:a bistable matrix screen having rows and columns; a first addressing device connected to said rows; a second addressing device connected to said columns; a control and synchronization device connected between the first addressing device and the second addressing device; a first generator which sequentially generates a selective operation; and a second generator which sequentially generates a semi-selective operation and a next subsequent semi-selective operation, wherein said first and second addressing devices, said control and synchronization device, and said first and second generators are configured to apply to a first row of said matrix screen the semi-selective operation followed by said selective operation, delayed the operation by a weighted delay time having a duration equal to the time interval between application of the semi-selective operation and the next subsequent semi-selective operation, multiplied by a factor k, chosen between 0 and 1 and adjustable to a desired luminosity, and configured to repeatedly apply other semi-selective operations and selective operations non-periodically to said row in order to display an image with half-tones, wherein the duration of a first weighted delay time between a first selective operation and a first semi-selective operation being different from the duration of a second weighted delay time between a second selective operation and a second semi-selective operation for a same value of said factor.
- 10. The adjustable half-tone display system of claim 9 wherein:said first generator comprises a read-only memory; and said second generator comprises a read-only memory.
- 11. The adjustable half-tone display system of claim 9 wherein:said first generator comprises a memory element which stores a first sequence; and said second generator comprises a memory element which stores a second sequence.
- 12. The adjustable half-tone display system of claim 9 further comprising:an overall user-actuated luminosity control device connected to at least one of said first generator and said second generator.
- 13. The adjustable half-tone display system of claim 12, wherein said overall luminosity control device comprises a selector switch.
Priority Claims (1)
Number |
Date |
Country |
Kind |
93 14522 |
Dec 1993 |
FR |
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Parent Case Info
This application is a Continuation of application Ser. No. 08/348,122, filed Nov. 28, 1994, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0 457 638 A1 |
Nov 1991 |
EP |
0 549 275 A1 |
Jun 1993 |
EP |
Non-Patent Literature Citations (1)
Entry |
English Abstract of Japanese Patent No. 4248588, Sep. 4, 1992. |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/348122 |
Nov 1994 |
US |
Child |
08/927668 |
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US |