SU1285629A1 - Device for automatic control of white balance in colour picture tube - Google Patents

Abstract

The invention relates to television. The functionality of the device is enhanced by automatically adjusting the white balance in color picture tubes with planar spotlights. The device contains a color kinescope 1 with electronic spotlights R, G and B, each of which contains a cathode 2, a modulator 3 and an accelerating electrode 4, as well as a test signal introduction unit, 5, three adjustable amplifiers (V) 6.7 and 8, two keys (K) 9 and 11, a source of positive bias (P1C) 10, a beam current detector 12, a switch 13, three memory blocks (PSU) 14, 15 and 16 and a control unit 17. When arriving at inputs Y 6,7 and 8, the signals R, G, and B, corresponding to the storyline, are processed in the corresponding channel and along; E; there are 2 electronic searchlights R, G, and B on the cathodes kinescope 1. The control pulse closes K 11 and the voltage from Ш1С 10 is applied. to the modulator 3 of the corresponding electronic searchlight. In this case, using K 9 removes the voltage from the electrode 4. The cathode 2 current is connected to the circuit of the modulator 3, measured by the detector 12 and through the switch 13 enters the input power supply .14, 15 or 16, which generates an error signal. strengthening the corresponding (Y) 6.7 or 8. The goal is achieved by the introduction of K 9 and 11 and IPS 10. 2 Il. (L 1C OS ate P5 tv5; o SSff- n Yl /

Description

The invention relates to the production of communications equipment, in particular television, and can be used in color information display devices, for example, in video monitoring devices, color displays, color television receivers.

The purpose of the invention is to expand the functional capabilities of the device by automatically adjusting the white balance in color kinescopes with g-channary arrangement of searchlights.

Figure 1 shows a structural electrical circuit of an automatic

White balance adjustments in the color kinescope; 2 shows timing diagrams for the operation of the device.

The device for automatic white balance adjustment in a color kinescope contains a kinescope 1 with cathodes 2, modulators R, G, B 3, accelerating el | electrode 4, test signal input unit 5, adjustable amplifiers 678 of R, G, B signals, respectively, second switch 9, positive bias source 10, first switch 11, beam current detector 12, switch 13, R, G, B memory blocks 14-16, control block 17.

The device works as follows.

During the forward frame sweep, unit 5 is entered and the test signal is locked by the absence of control pulses from control unit 17 and R, G, B signals corresponding to the scene are received at the input of adjustable amplifiers 6-8, after processing in the corresponding channel these signals are sent to the corresponding cathodes 2 electronic searchlights R, G, B kinescope 1.

The modulators 3 electrons of the searchlights are connected by direct current and connected to the common wire by means of the first switch 11, and a positive voltage of 800-1000 V is applied to the accelerating electrode 4.

A control damping pulse (OIG, fig.2a) and lowercase damping pulses (SGI, fig.25) are fed to the input of the control unit-17.

The optimal time interval for generating control signals is the period from 22 to 24 lines during the operation of the OIG, since it is this interval that is intended for shaping.

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test signals inside the page. The control unit 17 generates control pulses with the second key 9 (FIG. 2b), the control pulses - with the introduction unit 5 (FIGS. 22,}, e) and the switch 13 in such a way that during the introduction of the test signal into the signal processing channel R (FIG. 221) The meter 12 is connected by the switch 13 to the memory block 14 of the current value of the beam of the electronic spotlight R. The control of the block 5 and the switch 13 during the measurement of the currents of the electronic spotlights G and B (FIG. 2, e) is similar.

At the same time, the control unit 17 generates (Fig. 2g) control pulses of the first key 11. In the absence of these pulses, the modulators 3 of the electronic projectors of the kinescope 1 are connected to a common wire. When pulses are delivered from the control unit 14, the modulators of 3 electronic projectors are connected via a detector 12 to a positive bias source 10 to close the cathode currents of the 2 electronic projectors to the modulators 3 and measure them.

The test video signal generated in the control block 17 (Fig. 2) is fed to the control input of the block 5 and on arrival at the first control input of the control pulse block 5 (Fig. 2), the test video signal is fed to the input of the adjustable amplifier 6 of the R signal and from its output - to the cathode 2 of the electronic searchlight R.

The control pulse (Fig. 2 closes the first switch 11 and the voltage from the source 10 is applied to the modulator 3 of the electronic searchlight R, while the positive voltage from the accelerating electrode 4 of the electronic searchlight is removed by the second switch 9.

Thus, the current of the cathode 2 of the electronic illuminator R is shorted to the circuit of the modulator 3, measured by the detector 12 and from the output of the switch 13 arrives at the input of the memory block 14 of the current value of the beam of the electronic illuminator R (Fig. 2i). Similarly, the measured currents of the cathodes 2 of the electronic projectors G and B are received at the inputs of the memory blocks 15 and 16 (Fig. 2K, L). The signal from the output of the memory block 14 is the error control signal

(Fig. 21M) gain of adjustable amplifier 6 of signal R.

The generation of error signals (Fig. 2n, P), the gain factors of the amplifiers 7 and 8 of the G and B signals, are similar.

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An automatic white balance adjustment device in a color kinescope containing an adjustable signal amplifier R, an adjustable signal amplifier G, an adjustable signal amplifier B, the information inputs of which are connected to the corresponding outputs of the test signal introduction unit, the inputs of the R, G signals of which B are respectively first the second and third inputs of the device, and the first second, third inputs, and. - also the control input of the test signal injection unit is connected respectively to the first, second, third and fourth outputs of the control unit, the switch j is the first, second and third control inputs of which are connected respectively to the fifth, sixth and seventh outputs of the control unit, moreover, the switch input is connected with the output of the beam current detector, and the first, second and third outputs of the switch are connected respectively 5

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with the inputs of the signal storage unit R, the signal storage unit C and the signal storage unit B, whose outputs are connected respectively to the control inputs of adjustable amplifiers of the R, G and B signals, characterized in that, in order to expand the functionality of the device by providing automatic white balance adjustment in a color kinescope with a planar arrangement of spotlights, a first key, a source of positive bias, a second key are entered into it, the R, G, B modulators of the color kinescope are interconnected, and the signal The primary input and control input of the first switch are connected respectively to the output of the beam current detector and the eighth output of the control unit; the second input and output of the first switch are connected respectively to the common wire and R, G, B modulators of the color kinescope; the output of the positive offset source is connected to the input the beam current detector, the control input of the second switch is connected to the ninth output of the control unit, the output of the second switch is connected to the accelerating electrode of the color kinescope, and the input is the power input of the accelerating electrode Foot kinetics. Osprey, and the outputs of the adjustable amplifiers R, G and B are connected respectively to the cathodes R, G and B of the color kinescope.

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Claims (1)

The claims ¹⁰ A device for automatically adjusting the white balance in a color tube, comprising an adjustable signal amplifier R, an adjustable signal amplifier G, an adjustable signal amplifier B, the information inputs of which are connected to the corresponding outputs of the test signal input unit, the input signals of R, G, B of which are respectively the first, 20 the second and third inputs of the device, and the first, second, third inputs, a. 'also the control input of the test signal input unit is connected respectively to the first, second, third and fourth outputs of the control unit, the switch, the first, second and third control inputs of which are connected. respectively, with the fifth, sixth and seventh outputs of the control unit, wherein the signal input of the switch is connected to the output of the beam current detector, and the first, second and third outputs of the switch are connected respectively to the inputs of the signal memory block R, the signal memory block G and the signal memory block B the outputs of which are connected respectively to the control inputs of adjustable signal amplifiers R, G and B, characterized in that, in order to expand the functionality of the device by providing automatic adjustment of white balance in a kinescope with a planar arrangement of searchlights, the first key, a source of positive bias, the second key are inserted into it, the modulators R, G, B of the color tube are connected to each other, and the signal input and control input of the first key are connected respectively to the output of the beam current detector and the eighth output of the control unit, the second input and output of the first key are connected respectively to a common wire and color tube modulators R, G, B, the output of the positive bias source is connected to the input of the beam current detector, the control input the second key is connected to the ninth output of the control unit. the output of the second key is connected to the accelerating electrode of the color tube, and the input is the power input of the accelerating electrode of the color tube, and the outputs of the adjustable signal amplifiers R, G and B are connected respectively to the cathodes R, G and B of the color tube.