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Plasma display device

A display device, plasma technology, applied in static indicators, instruments, etc., can solve the problems of difficult output voltage, constant, etc.

Inactive Publication Date: 2007-07-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since the power supply device described in Patent Document 1 detects a change in the output voltage and then performs control to restore the original voltage, it is difficult to keep the output voltage constant when the discharge current changes rapidly.

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Experimental program
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Embodiment approach 1

[0043] FIG. 1 is an exploded perspective view showing the structure of a PDP 1 used in a plasma display device according to Embodiment 1 of the present invention. The PDP 1 has a front substrate 2 and a rear substrate 3 disposed opposite to each other. On the front glass plate 4 of the front substrate 2 viewed from the side of the front substrate 2, the scan electrodes 5 and the sustain electrodes 6 are formed in a plurality of pairs parallel to each other. Furthermore, dielectric layer 7 is formed to cover scan electrode 5 and sustain electrode 6 , and protective layer 8 is formed to cover dielectric layer 7 . A plurality of data electrodes 10 are formed parallel to each other on rear glass plate 9 of rear substrate 3 , and dielectric layer 11 is formed so as to cover data electrodes 10 . Further, phosphor layer 13 is formed on the surface of dielectric layer 11 and the side surfaces of barrier ribs 12 . Furthermore, discharge gas is enclosed in discharge space 14 sandwiche...

Embodiment approach 2

[0073] 10 is a circuit diagram of a power supply unit for supplying a discharge current in the plasma display device according to Embodiment 2 of the present invention. In Embodiment 2, a DC-DC converter 141 capable of controlling the power supply amount based on the first current control signal Cont and the second current control signal Vadj is used as the power supply means.

[0074] In FIG. 10 , a triangular wave generator 142 generates a triangular wave voltage with a constant cycle, and the generated triangular wave voltage becomes a triangular wave voltage Trw with a set bias in a bias control circuit 143 and is input to a comparator 144 . The bias value of the triangular wave voltage Trw is determined by the second current control signal Vadj. Furthermore, the comparator 144 compares the voltage of the first current control signal Cont with the triangular wave voltage Trw, and outputs a PWM (PULSE WIDTH MODULATION) signal Cmp.

[0075] When the voltage of Vadj is const...

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Abstract

In a plasma display device, a lighting percentage is calculated from a video signal inputted into the plasma display device, and such an output current of a DC-DC converter (140) as is equal to the discharge current for a maintenance period corresponding to that lighting percentage is fed in synchronism with the generation timing of the discharge current. With this configuration, a maintenance pulse voltage can be kept constant even if the discharge current for the maintenance period of each subfield abruptly varies.

Description

technical field [0001] The present invention relates to a plasma display device known as a large-screen, thin and light display device. Background technique [0002] In recent years, large-scale image display devices such as plasma display devices are spreading. Such a large-scale image display device can clearly express even the subtle parts of the image, but on the contrary, the image disorder caused by the unstable voltage of the power supply is also relatively obvious. In order to prevent such damage, it is important to keep the output voltage of the power supply unit of the image display device constant. [0003] A plasma display device displays images using a plurality of discharge cells provided in a plasma display panel (hereinafter, simply referred to as "PDP"). The discharge current of the PDP at this time largely depends on the gray scale value of the displayed image. Furthermore, when the grayscale value increases, the discharge current of the PDP increases, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/28G09G3/20G09G3/288
Inventor 池田敏山田义则足达克己西谷干彦后藤真志
Owner PANASONIC CORP