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Vertical deflection circuit and colour display tube

A vertical deflection and kinescope technology, applied in color TV, color TV parts, TV and other directions, can solve the problems of increased scanning line density and slow deflection speed, and achieve the effect of reducing the vertical deflection circuit

Inactive Publication Date: 2006-08-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the vertical deflection voltage supplied to the vertical deflection system cannot follow the impedance change of the vertical deflection system relative to the deflection current, and the deflection speed in the vertical direction becomes slow near the center of the vertical direction of the color picture tube display surface.
Therefore, near the center of the vertical direction of the display surface, the density of the scanning lines in the vertical direction becomes high, and there is a problem that a band-shaped white part in the horizontal direction can be seen.

Method used

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  • Vertical deflection circuit and colour display tube
  • Vertical deflection circuit and colour display tube
  • Vertical deflection circuit and colour display tube

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0024] Such as figure 1 As shown, the vertical deflection circuit of the present invention includes a vertical deflection system 3 and a vertical linear correction circuit 1 . The vertical deflection yoke 3 includes a vertical deflection coil 60 , vertical coma correction coils 209 a , 209 b , 209 c , 209 d and correction coils 210 a , 210 b , and a convergence correction circuit 2 . Convergence correction circuit 2 is a circuit that utilizes the switching action of diodes 203, 204, 206, 207. Figure 4 The circuit of the conventional example shown has the same configuration, so description thereof will be omitted. The vertical linear correction circuit 1 is a part constituting the features of the present invention. When the electron beams are bombarded near the center of the display surface of the color picture tube (not shown in the figure), that is to say, when the current value of the vertical deflection current is A device that reduces the impedance of the vertical defle...

no. 2 example

[0037] image 3 Indicates the main part of this embodiment. image 3 The circuit is figure 1 A modified example of the middle vertical linearity correction circuit 1. The difference from the first embodiment is that the resistor 103 of the vertical linearity correction circuit 1 is replaced with a variable resistor 105 . Note that since the basic operation of the vertical deflection circuit of this embodiment is the same as that of the first embodiment, detailed description thereof will be omitted.

[0038] According to the vertical deflection circuit of this embodiment, by adjusting the resistance value of the variable resistor 105 while visually viewing the display surface of the color picture tube, the horizontal direction appearing in the central portion of the color picture tube display surface can be brought to a horizontal direction. The white part of the shape is suppressed to a minimum.

[0039] In addition, in the case of deviations in the manufacture of the ver...

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PUM

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Abstract

A vertical deflection circuit for a color picture tube apparatus comprises a vertical deflection yoke and a vertical linearity correction circuit connected to the vertical deflection yoke. The vertical deflection yoke has a vertical deflection coil, a convergence correction circuit using a diode as a switch, and a vertical coma aberration correction coil. An impedance of the vertical linearity correction circuit varies within a range where a vertical deflection current is in the vicinity of 0 A so as to reduce an impedance of the vertical deflection circuit.

Description

technical field [0001] This invention relates to vertical deflection circuits for use in color picture tube devices such as television sets and display monitors. Background technique [0002] In the one-line color picture tube used in TV sets and display monitors, etc., if the center axis of the vertical deflection magnetic field and the center axis of the color picture tube are misaligned, and the vertical deflection magnetic field and the color picture tube If the rotation is misaligned, misconvergence will occur at the upper and lower parts of the display surface (fluorescent screen surface) of the color picture tube, respectively. [0003] As a method of correcting such misconvergence separately at the upper and lower portions of the display surface, JP-A-8-102270 discloses that two auxiliary coils are provided on the electron gun side at the rear of the deflection yoke, and that diodes are used in the coils. The bridge circuit flows a correction current through a conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/28H04N3/23G09G1/04H04N3/16H04N3/22H04N3/233H04N5/68
CPCG09G1/04G09G2320/02H04N3/233H04N5/68H04N9/28
Inventor 内田由纪夫岩本智昭
Owner PANASONIC CORP