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Cathode ray tube display device and cathode ray tube display method

A cathode ray tube and display device technology, which is applied in the direction of cathode ray tube indicator, cathode ray tube/electron beam tube, electrode device and related components, etc., and can solve the problems such as the darkening of the cathode ray tube screen

Inactive Publication Date: 2005-10-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since the electrons passing between the anode 2 and the cathode 7 decrease, the screen of the cathode ray tube becomes dark.

Method used

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  • Cathode ray tube display device and cathode ray tube display method
  • Cathode ray tube display device and cathode ray tube display method
  • Cathode ray tube display device and cathode ray tube display method

Examples

Experimental program
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Effect test

Embodiment 2

[0047] In Embodiment 1, the Gm electrode voltage control circuit 12 is configured such that the time data at which the change in the distance between the cathode 7 and the Gm electrode 4 becomes saturated, that is, the predetermined time t, is set in advance, based on the elapsed time measured by the time measurement circuit 11. Whether the output becomes a predetermined time t to control the applied voltage to the Gm electrode 4, so as to eliminate the change of the electron beam current due to the change of the interval between the cathode 7 and the Gm electrode 4, but in Embodiment 2, as image 3 As shown, the average electron beam current flowing from the anode 2 to the cathode 7 is detected to control the Gm electrode voltage source 10 to adjust the Gm electrode voltage.

[0048] In the detection of the electron beam current, it is configured that a resistor connected in series with the coil of the flyback transformer 8 is arranged in the electron beam current detection ci...

Embodiment 3

[0057] Figure 5 It is a block diagram showing the structure of the cathode ray tube display device of the third embodiment. In the figure, 14 is the filament for heating the cathode 7; 15 is the filament voltage source, which applies voltage to the filament 14 and applies information to the output voltage of the Gm electrode voltage control circuit 12. The Gm electrode voltage control circuit 12 detects whether the filament voltage is supplied, and controls the Gm electrode voltage source 10 to adjust the Gm electrode voltage after the filament voltage is supplied.

[0058] That is, in Figure 11 (a) When the filament voltage is supplied in such a time relationship, after the time t2 from turning on the power to supplying the filament voltage has elapsed, the temperature of the electron gun 20 rises after the supply of the filament voltage {refer to Figure 11 (b)}, so the Gm electrode voltage control circuit 12 controls so that the output of the Gm electrode voltage source...

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PUM

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Abstract

To solve the problem accompanying the temperature of an electron gun 20 being raised and an internal between a Gm electrode 4 and a cathode 7 is broadened by temperature, a potential change similar to the case where a Gm electrode voltage is lowered is generated, then the quantity of electrons which pass is decreased, where upon a stream of a cathode-ray tube becomes dark, when the cathode voltage is constant. A Gm electrode voltage control circuit 12 is provided to the Gm electrode voltage source for control an applied voltage to the Gm electrode 4 by time information from a time-measuring circuit 11 such that the change of the interval between the cathode 7 and the Gm electrode 4 is corrected during a period of time between the time the voltage is applied to each electrode of a Hi-Gm tube 1 and the time the charge of a size of the interval between the cathode 7 and the Gm electrode 4 is saturated.

Description

technical field [0001] The present invention relates to a cathode ray tube display device and a cathode ray tube display method using a cathode ray tube including an electron gun provided with a Gm electrode for modulation. Background technique [0002] Figure 7 It is an explanatory cross-sectional view showing enlarged the vicinity of the cathode of the electron gun in the cathode ray tube (hereinafter referred to as "Hi-Gm tube") described in JP-A-11-224618. In the figure, 7 is the cathode, 6 is the G1 electrode that extracts electrons from the cathode 7, 5 is the G2 electrode that extracts electrons from the cathode 7, 3 is the G3 electrode that extracts electrons from the cathode 7, and 16 is the electron emission that is arranged on the surface of the cathode substance. In addition, 4 is a Gm electrode for modulation which is provided between the G2 electrode 5 and the G3 electrode 3 and which can modulate the flow of electrons generated by the electrons emitted from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/59G09G1/00H01J29/48H01J29/50H04N3/18H04N5/68
CPCH01J29/484H01J29/503H04N3/18
Inventor 瓶子晃永安井裕信
Owner MITSUBISHI ELECTRIC CORP