CS205684B1 - Connection for the display projection - Google Patents

Description

CZECHOSLOVAK SOCIALIST REPUBLIC (19) DESCRIPTION OF THE INVENTION JUMŠKÉM certificate 205684 íllj (Bij (51) Int. Cl.3 H 01 J 37/28 (22) Registered 23 01 79 (21) (PV 498-79) (40) Published 29 08 80 BACKGROUND (45) Published 29 07 83 A DISCUSSIONS (75).,.

The inventor HLADIL KAREL mg., BRNO (54) Soldering for display 1

BACKGROUND OF THE INVENTION The present invention relates to a display connection display while displaying an object with a display. Ymodulation or combined intensity and Y modulation on the monitor screen. The wiring is primarily intended for scanning electron microscopes. '

Mqderní. . The scanning electron microscopes are equipped with so-called Y modulation, which does not modulate the image signal from the detectors to the electron beam in the monitor screen intensively, but causes additional deflection in the axis direction. Y. This method of modulation is not shown dis-play, since the letters and numbers are not readily readable by the Ymodulation and act non-aesthetically.

These prior art drawbacks are avoided by engaging the display display with simultaneous display of the object by means of Y modulation or combined intense and Y modulation on the screen monitor, the principle of which is that the video amplifier coupled to the ground terminal is connected via a switch to either a display terminal or a full video signal terminal. wherein the video amplifier output is coupled to a cathode or a Wehnelt screen cylinder whose vertical deflection coils are coupled to outputs of a deflection amplifier coupled to a ground terminal whose input is a common node coupled via a first resistor with a vertical deflection terminal and a third and second resistances and, over the first contact of the second switch with the terminal, a complete video signal and, secondly, with a correction 2 circuit connected to the ground terminal, the short circuit of the keying pulses is connected to the base resistor by the collector connected to the other at with a resistor and an emitter connected to a ground terminal with which the other contact of the second switch is still connected.

The main advantage of the described connection is that it allows the object to be displayed with Y modulation or a combined intensity and Y modulation of the present intensive display of the display without distortion. The connection is simple and does not require adjustment.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in more detail by the accompanying drawing, wherein an exemplary embodiment is shown. In the circuit shown in Fig. 1, the input of the video amplifier 11 is connected via the first contact of the first switch 10 to the terminal 1 for displaying the modulation or via the second contact of the first switch 10 to the terminal 3 for the complete video signal, with the combined Y modulation with intense modulation. The signal from terminal 3 for the complete video signal is fed through the first contact of the second switch 15 and through the second and third resistors 6 and 7 to a common node with one end correction circuit 9 by the input of the deflector 12 and the first resistor 5 which is connected by the terminal 2 of the vertical deflection. In the common node, the complete picture signal is mixed with the saw voltage for vertical deflection. Correction circuit 9 is a composite of members with a voltage-dependent resistance and serves 20 5 8 4

Claims (1)

205684 to correct geometric distortion caused by nonlinear deflection of the electron beam in the monitor screen. The outputs of the current deflection amplifier 12 are connected to the vertical deflection coils 13 of the screen 14, the cathode or Wehnelt roller of the screen 14 being connected to the output of the video amplifier 11. A collector of transistor 8 is connected between the second and third resistors 6 and 7, the base of which is connected to the terminal 4 The emitter of transistor 8 and ground terminals of correction circuit 9 of video amplifier 11 of deflector 12 and second contact of switch 15 are coupled to ground terminal. The wiring in FIG. 1 operates as follows: The deflection voltage of the bias 2 of vertical deflection is fed through the first resistor 5 to a common node where it mixes with the signal going through the first contact of the second switch 15 and the second and third resistors 6a 7 of the complete video signal terminal 3. The mixed signal amplified by the correction circuit 9 is amplified by the current deflection of the by the amplifier 12 and brought to the vertical deflection coil 13 of the screen 14. The horizontal deflection coils of the screen 14 are fed with a current-corrected sawtooth with a line frequency. The input of the video amplifier 11 is modulated via the first contact of the first switch 10 to the terminal 1 for the display, where the duration of the video modulation is DC voltage corresponding to the white level for the duration of the display is the voltage level corresponding to the black level. by means of Y modulation or combined intense and Y modulation on the monitor screen, characterized in that the video amplifier (connected to the ground terminal is connected via the input via a switch (10) either to the display terminal (1) or with the terminal (3) a complete video signal, the output of the vi-de-amplifier (11) being connected to the cathode or a Wehnelt cylinder of the screen (14) whose vertical deflection coils (13) are connected to the outputs of the deflection amplifier (12) connected to it is interrupted by pulses for display white balance characters, in which case we receive a white black light Black markings displayed on a white background are obtained when the display 1 for the display remains voltage-level for the duration of the display, interrupted by pulses for display characters with a black level. in that the transistor 8 is converted to a saturated state from terminal 4 by the key pulse. On the screen, we receive an object image with a Y modulation and an intensity modulation display. Combine the video input amplifier 11 with the three-way switch 10 to receive the complete video signal, obtaining a combined intensity and Y modulation image and displaying again with intensive modulation. The complete video signal also contains, in addition to the image signal, pulses for display, blanking and possibly synchronization pulses. Typically, only the intensely modulated image can be retained by switching the second switch 15 to a second contact connected to the ground terminal, thereby turning off Y modulation. A similar result can be obtained by leaving transistor 8 in a saturated state or by shorting it with a switch 16. Typically, blanking line and frame pulses are included in the complete video signal, and are fed simultaneously with the display signal to terminal 1, or can be fed separately to video amplifiers 11, optionally directly to a Wehnelt cylinder or cathode of the screen. DISCLOSURE OF THE INVENTION is a ground terminal whose input is common to one another via a first resistor (5) with a vertical deflection terminal (2) and a second resistor (7 and Θ) and a first terminal of the second switch (15) with a clamp. (3) a complete video signal and, on the other hand, a correction circuit (9) connected to the ground terminal, while the keying terminal (4) is coupled to the base of the transistor (8) by the collector connected to the second and third resistors (6 and 7) and the emitter connected with a ground terminal with which the second contact of the second switch (15) is still connected. 1 drawing 7