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Display tube device with enhanced resolution ratio

A color picture tube and control device technology, applied in the direction of electrode device and related components, using cathode camera tube image reproducer, image communication, etc., can solve unrealistic problems

Inactive Publication Date: 2006-01-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, since a high voltage of hundreds to thousands of V needs to be applied to the auxiliary electrode, changing the intensity of the pre-focus lens in order to display images with high-definition brightness changes requires high-speed (several megahertz to tens of MHz) changes. High voltage amplifier circuit is unrealistic after all

Method used

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  • Display tube device with enhanced resolution ratio
  • Display tube device with enhanced resolution ratio
  • Display tube device with enhanced resolution ratio

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no. 1 example

[0044] figure 2 It is a diagram of a longitudinal section including a tube axis Z of a picture tube device according to an embodiment of the present invention. figure 2 Among them, the picture tube device 2 includes a glass envelope formed by joining a front panel 22 and a funnel 25, and the in-line electron gun 20 is disposed inside a neck portion 25a of the funnel 25. The screen size is 76cm, and the deflection angle is 106 degrees.

[0045] The inside of the front panel 22 is coated with red, green and blue phosphors to form a phosphor screen 24 . The electron beam 21 emitted from the electron gun 20 is deflected by the deflection yoke 26 installed outside the funnel 25, the color is selected by the shadow mask 23, and then irradiated on the phosphor screen 24 to make the phosphor emit light.

[0046] [2] Structure of electron gun 20

[0047] image 3 It is an external perspective view showing the structure of the electron gun 20 of this embodiment, and a part of the ...

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Abstract

A CRT device with an electron gun provided therein includes control means for controlling voltages applied to a cathode and a control electrode constituting the electron gun. The control means exerts control on each electrode voltage so that the difference between the cutoff voltage of the cathode and the voltage of the control electrode is greater when the luminance level of a luminance signal separated from picture signal is higher, thereby minimizing a spot diameter.

Description

Background of the invention [0001] This invention relates to picture tube devices used in computer monitors and television receivers, and more particularly to techniques for improving resolution. [0002] related technology [0003] The kinescope device used in computer monitors and television receivers uses an electron gun to irradiate electron beams onto a phosphor screen, causing phosphors to emit light to display images. The smaller the size of the spot (hereinafter referred to as "spot diameter") of light emitted by the phosphor screen by the electron beam, the higher the resolution is obtained. [0004] figure 1 It is a general cross-sectional view schematically showing the conventional structure of an electron gun. figure 1 Among them, the electron gun 1 is composed of a cathode 10 , a control electrode 11 , an accelerating electrode 12 , a converging electrode 13 and a final accelerating electrode 14 . Electrons emitted from the cathode 10 are accelerated by the ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/48H04N5/63H01J29/52H04N5/68H04N9/28
CPCH04N5/68H04N9/28H01J29/52
Inventor 山内真英太田和纪助野雅彦井东崇志
Owner PANASONIC CORP