US 7,023,406 B1 · Method and apparatus for enhancing peak luminance on plasma display panel

Abstract

To provide a plasma display device which implements a peak luminance higher than prior art, reduces the power dissipation, improves the smoothness of gradation display, and conducts clear display suitable especially for TV display. By setting a plurality of APL levels according to the average value of the scene brightness, and by shortening a sustaining pulse period and increasing the number of sustaining pulses of each sub-field in APL levels having small APL, the peak luminance is raised. Further, by making the sustaining pulse period long in APL levels having large APL requiring large discharge light emission power, the light emission efficiency is improved and the maximum power dissipation is reduced. The luminance distribution in the scene when the APL level is small is detected. On the basis of that information, setting of the number of sustaining pulses and the sustaining pulse period is changed in the same APL level. As a result, the peak luminance is increased, and the gradation smoothness in the dark scene is improved.

Claims34

Dependent claims

A peak luminance enhance (PLE) method for plasma display panel, which comprises the steps of:

determining a plurality of luminance levels (LLs), according to pixel data of a scene to be displayed;
determining a number of sustaining discharge (SD) pulses for each of said LLs;
determining a period of said SD pulses in case where said LL is lower than a predetermined value to be shorter than that of said SD pulses in case where said LL is greater than the predetermined value.

A peak luminance enhancement (PLE) apparatus for a plasma display panel, wherein an average picture level (APL)of a displayed picture is detected, and a period of sustaining discharge (SD) pulse is determined on the basis of said APL, which comprises:

a data processing means for processing digital RGB signal;
a sub-field selection means for selecting sub-fields on the basis of the output from said data processing means;
an APL detection means for detecting said APL on the basis of said digital RGB signal and for determining a plurality of luminance levels (LLs) for each of said sub-fields;
an SD pulse period setting means for setting up periods of said SD pulse for each of said sub-fields on the basis of the output from said APL detection means;
and
an SD pulse number setting means for setting up numbers for each of said sub-fields on the basis of the output from said APL detection means,
wherein:
said numbers of SD pulses are determined for each of said LLs, and
said period of said SD pulses in case where said LLs is lower than a predetermined value is shorter than a period of said SD pulses in case where said LL is greater than the predetermined value;
and
two or more values are determined as said predetermined value.

8 more elements

Dependencies are inferred from the claim text.

Method and apparatus for enhancing peak luminance on plasma display panel

Life of this patent

Method and apparatus for enhancing peak luminance on plasma display panel

Life of this patent

Abstract

Claims34