Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-05-09
1998-03-10
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 94, 345103, G09G 336
Patent
active
057266735
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to systems for displaying a pattern on a liquid crystal for a laser marker and more particularly, to a system for performing predetermined control over switching of display to attain high speed marking.
BACKGROUND ART
For a technique for applying liquid crystal made from so-called high polymer compound to a mask for a laser marker, the applicant of the present application has already filed patent applications (Japanese Patent Application No. 3-224916, etc.).
In such a high polymer compound type liquid crystal, when it is desired to switch the display screen of the liquid crystal, i.e., a marking pattern, this is attained, for the purpose of preventing from an after-image at the time of the switching of display, by performing such non-display processing that grounds row and column electrodes provided for the respective pixels of the liquid crystal and then by applying predetermined voltages to the row and column electrodes. In this case, ones of the pixels subjected to no application of such voltages are put in their laser-beam scattering state while the other pixels subjected to the application of the voltages are put in their laser-beam transmission state.
However, the above display switching operation is not instantaneously carried out and requires a time of about 60 msec. Accordingly, during this display switching time, the liquid crystal is put in its non-display state and the marking is not performed, hence this time period becomes a wasteful time in operation. In addition, such switching of the display screen is generally continually done and pattern marking operation is often continuously done. In this case, since the above switching time is required whenever the pattern is changed, such switching time is accumulated for each pattern change to reach a lot of loss time when viewed from the entire operation, which hinders realization of high-speed marking.
An invention for realizing high-speed marking is disclosed, for example, in Japanese Patent Application Laid-Open Publication No. 2-268988, in which the display surface of a liquid crystal mask for a laser marker is divided into 2 upper and lower sections so that, when scanning for the upper half is completed and then scanning starts for the lower half, rewriting is carried out for a marking pattern of the upper half.
This invention, however, fails to positively describe such processing as to put only the upper half display in its non-display state during the display switching operation of the upper half display. Therefore, when the invention is applied to a laser marker with use of the aforementioned high polymer compound type liquid crystal as it is, this disadvantageously involves generation of an after-image.
When analyzed, the liquid crystal switching time is roughly divided into a time necessary for extinguishing the pattern being displayed and a time necessary for activating a new display pattern. Between these times, the displayed-pattern extinguishment time, which depends on the composition material, structure, etc. of the liquid crystal mask, cannot be easily shortened.
For this reason, for the purpose of realizing high-speed marking, when the marking operation is started before the liquid crystal display appears, irregularities take place in the marking on a workpiece. Accordingly, there has been a limit in realizing higher-speed marking while maintaining the marking quality.
In view of such circumstances as mentioned above, it is a first object of the present invention to realize high-speed marking for a laser marker with use of, in particular, a high polymer compound type liquid crystal while preventing generation of an after-image.
A second object of the present invention is to attain high-speed marking while maintaining the marking quality.
DISCLOSURE OF THE INVENTION
In accordance with a first invention of the present invention, there is provided a liquid crystal display for a laser marker wherein row and column electrodes are provided for each of pixels of a liquid crystal, the ro
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patent: 4679043 (1987-07-01), Morokawa
patent: 4778260 (1988-10-01), Okada et al.
patent: 5363117 (1994-11-01), Matsuura et al.
patent: 5432461 (1995-07-01), Henley
patent: 5473339 (1995-12-01), Kanatani et al.
Mori Akira
Saito Yoshinori
Tsuda Yukihiro
Hjerpe Richard
Kabushiki Kaisha Komatsu Seisakusho
Kim Juliana S.
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