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| Thin buzzer |
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| Picture processing method for correcting distorted pictures and apparatus for executing this method |
| A first object of the present invention, therefore, is to provide a picture processing method for ... |
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| Sound mixing system for film sound editing |
| AND OBJECTS An object of this invention is the provision of a new and novel sound mixing system for ... |
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| Method and apparatus for pre-compensation in an optical disc |
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Autoconvergence of a cathode ray tube using a semiconductor detector
| Details |
Inventors: Culter, Robert G.;
Assignee: Tektronix, Inc. (Beaverton, OR)
Primary Examiner: Blum; Theodore M.
Assistant Examiner:
Attorney, Agent or Firm: Winkelman; John D., Smith; Joseph H.
A CRT calibration system is provided having a CRT with a display screen, an electron gun system, and a plurality of feedback elements. Each feedback element has an active area disposed proximately to the display screen at a preselected location such that an electron beam from the electron gun system can strike at least a portion of the active area. In response to being struck by electrons, each feedback element provides a feedback signal related to the area of the portion struck. The system also includes a detector system for detecting each feedback signal, and an integrating analog-to-analog converter which, in response, provides a digital signal related to the portion of the active area struck and thereby to the position of the electron beam relative to the particular feedback element interrogated. Also included is a control system for directing the electron beam to strike a sequence of portions of the active area for each feedback element, thereby evoking a corresponding sequence of feedback signals for each feedback element and a corresponding sequence of digital signals, enabling the control system to determine the location of each feedback element. |
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DETAILED DESCRIPTION In accordance with preferred embodiments of the invention, a CRT calibration system is provided having a CRT with a display screen, an electron gun system, and a plurality of feedback elements.
Each feedback element has an active area disposed proximately to the display screen at a preselected location such that an electron beam from the electron gun system can strike at least a portion of the active area.
Although the system has a plurality of feedback elements, for the purposes of discussion, the calibration apparatus will be discussed in terms of a single exemplary feedback element, since, generally, only one feedback element is interrogated at a time.
In response to being struck by electrons, the feedback element provides a feedback signal related to the area of the portion struck.
The system also includes a detector system for detecting the feedback signal and for providing a useful input signal level, hereinafter called a second signal, to an integrating analog-to-digital converter.
In response, the converter provides a digital signal related to the position of the active area struck which can be correlated with the position of the electron beam relative to the feedback element.
Also included is a control system for directing the electron beam to strike a sequence of portions of the active area of the feedback element, thereby evoking a corresponding sequence of feedback signals, a corresponding sequence of second signals, and a corresponding sequence of digital signals, for determining the location of the feedback element based on the sequence of digital signals.
In a peferred mode, the CRT includes a shadow mask interposed between the display screen and the electron gun system, with the feedback means located on the gun-side surface of the shadow mask and constructed of a phosphorescent material.
Although the feedback elements may assume several different configurations, a particularly useful configuration is one where the active area is made up of two disjointed legs of a right triangle, with a first leg oriented vertically and a second leg inclined at an angle relative to the horizontal
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