TH19961B - An emitter tube driver device with gamma correction. - Google Patents

Abstract

Amplifier (60) that will generate an amplified image signal in response to the signal. Picture input The current detector on which the cathode (Q3) will be connected to its output. It extends to the cathode of the fluorescent ray tube (20) and it creates an output current (IK) that is proportional to the current at the cathode of the fluorescent ray tube. The feedback path (82) supplies part of the measured cathode current generated by the cathode current probe to the circuit point (65 or 63) located in the amplifier. To obtain a signal to adjust the accuracy of gamma rays To an image created by a fluorescent ray tube. In use according to one model, the cathode current It is divided to produce a gamma-modulated portion of the fluorescent ray tube. And the part that controls the automatic fluorescence ray tube (AKB) bias.

Claims (3)

1. A device for driving a luminescent ray tube (20) with a cathode (K1) containing an amplifier (60) containing a transistor (Q1). Such transistors (Q1) have a base pole. For receiving picture input signals. With an emitter terminal connected to the point where the reference voltage is Through the first resistor (62) and there is a collector terminal connected through the load impedance section (Q2,68), including the second resistor (68) to the voltage source. High electricity The load impedance (Q2, 68) is said to cause the linearly magnified image output signal to rise on the collector terminal. Of the aforementioned transistor (Q1). The aforementioned cathode (K1) is connected to the said load impedance section (Q2,68) for generating A picture that represents the input signal of such picture. And is characterized by Electrical circuit section (Q3,82) to supply a specified portion of the current at the cathode (lk) taken by the aforementioned cathode (K1) of the aforementioned (20) cathode ( 65 or 63) located in such an expander (60) so that a specified portion of the current through which the aforementioned cathode (lk) passes through it. The first resistor is at the point where there is a reference voltage. 2. The equipment specified in Clause 1, having characteristics that The circuit consists of a buffer amplifier (70) connected between The impedance of such load And the aforementioned cathode And the third resistor (82) connected between the current output of the buffered amplifier and the said circuit point (65 or 63) located in the amplifier. 3.The equipment as specified in Clause 1 has characteristics that The circuit consists of a PNP transistor (Q3) with a terminal emitter. Is with the aforementioned cathode (K1) of the aforementioned radiant tube. This will have the base terminal connected to the load impedance section (Q2,68) of the said amplifier (60) and the collector terminal connected to the first resistor (62) as follows: say