Dynamic color temperature and color deviation calibration...

Details Dynamic color temperature and color deviation calibration... Dynamic color temperature and color deviation calibration...

2001-05-18

2002-08-27

Phan, Tho (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169400, C348S674000

Reexamination Certificate

active

06441563

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to plasma display panels (PDPs) and more particularly to a dynamic color temperature and color deviation calibration method for improving image quality shown on PDP.
BACKGROUND OF THE INVENTION
A manufacturing process of a conventional alternating current discharge type plasma display panel (PDP)
10
is shown in FIG.
1
. First, two different activation layers are formed on glass substrates
11
and
12
respectively. Then seal the peripheries of the glass substrates together. A mixed gas consisting of helium (He), neon (Ne), and xenon (Xe) (or argon (Ar)) having a predetermined mixing volume ratio is stored in a discharge space formed in between the glass substrates. A front plate
11
is defined as one that facing viewers. A plurality of parallel spaced transparent electrodes
111
, a plurality of parallel spaced bus electrodes
112
, a dielectric layer
113
, and a protective layer
114
are formed from the front plate
11
inwardly. From a corresponding rear plate
12
inwardly, a plurality of parallel spaced data electrodes
121
, a dielectric layer
124
, a plurality of parallel spaced ribs
122
, and a uniform phosphor layer
123
are formed. When a voltage is applied on electrodes
111
,
112
, and
121
, dielectric layers
113
and
124
will discharge in discharge cell
13
formed by adjacent spaced ribs
122
. As a result, a ray having a desired color is emitted from phosphor layer
123
.
The emissivity of a phosphor layer
123
is varied as panel temperature or operating frequency of PDP changes. Accordingly, as referring to
FIGS. 2
,
3
and
4
color temperature change and color deviation are occurred on panel of PDP
10
, resulting in a poor image quality shown on panel. Above operating frequency is defined as discharge number per unit time occurred on a discharge cell
13
. The higher the discharge number the higher the operating frequency will be. As shown in
FIG. 2
, the higher the operating frequency the lower the emissivity of phosphor layer
123
will be. This condition is even worse in a green phosphor layer
123
. Hence, undesired color temperature change and color deviation are occurred on the conventional PDP as panel temperature and operating frequency increase. This in turn renders an unacceptable image quality.
SUMMARY OF THE INVENTION
It is thus an object of the present invention to provide a dynamic calibration method implemented on a plasma display panel (PDP), the method comprising the steps of: (a) utilizing laws of color matching for calculating an emissivity change of a pixel of the PDP in response to a brightness change of one of red, green, and blue lights emitted by a corresponding one of red, green and blue discharge cells of the PDP through a numeric operation; (b) dynamically adjusting brightness of one of the emitted red, green, and blue lights by increasing or decreasing strength of input video signal of each of the discharge cells; and (c) eliminating a color temperature and a color deviation of the PDP due to an emissivity change. The invention can render an image having an optimum color purity and color temperature by eliminating adverse effects on PDP due to emissivity change.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 6018361 (2000-01-01), Fujii et al.
patent: 6184849 (2001-02-01), Stoller

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