CN105741747A - Method for improving PDP image gray level quality and reducing display power consumption - Google Patents

Abstract

The present invention discloses a method for improving PDP image gray level quality and reducing display power consumption. Through adoption of an APL (Average Power Level), the method for improving PDP image gray level quality and reducing display power consumption is able to solve the influences on stability and reliability of a device and a power supply caused by unbalanced power consumption change in the PDP dynamic image by a maintenance pulse adjusting method, and is able to dynamically improve the contrast and the brightness of the frame and lift the quality of the frame aiming at a dark frame.

Description

A kind of method promoting PDP image gray-scale level quality and reduction display power consumption

Technical field

The present invention relates to PDP (plasma) actuation techniques, especially relate to a kind of PDP image gray-scale level increased quality method.

Background technology

Driving principle according to PDP screen, maintains pulse accumulation light pulse thus showing picture.APL (AveragePowerLevel) automated power controlling curve is that the quantization that pixel pulse power is controlled shows, can be seen that, PDP screen is when showing low gray scale image, it is maximum that APL maintains number of pulses, particularly in high weight subfield part, there is substantial amounts of maintenance umber of pulse, but these subfields all do not need luminescence, thus result in the switching power loss of derailing switch time PDP screen drives, namely add the PDP screen power consumption when showing gray scale image.

In PDP display process, the GTG of image corrects the core methed being to improve image quality.At present, the image gray-scale level of PDP corrects the problem that main Research Emphasis exists two aspects: can one be when carrying out dynamic image GTG and correcting, guarantee the reliability and stability of working power；Can two be when tableaux GTG is corrected, guarantee input gray level and actual displayed effect always, it does not have gray-scale inversion phenomenon occurs.

Summary of the invention

It is an object of the invention to be adjusted for the APL calculation controlled, guarantee power good and the copper wire of high-contrast display effect can be realized, adopt PDP brightness calculation formula that all for PDP luminous factors are carried out overall consideration, it is ensured that the image gray-scale level that each APL point is corresponding is linear.

It is another object of the present invention to, obtain APL numerical value by scanning, carry out drives and reduce the power consumption when showing low gray scale image of PDP screen.

For achieving the above object, the present invention adopts the following technical scheme that

A kind of method promoting PDP image gray-scale level quality and reduction display power consumption, comprises the following steps: the scanning PDP screen sub-field code when showing low gray scale image successively, generates the subfield map coding schedule of correspondence；

By PDP screen show low gray scale image time APL tables of data be multiplied with corresponding position in above-mentioned sub-field code table, obtain new APL tables of data, the new value in APL tables of data be respective pixel show time pulse data value；

When PDP shows image, the applying of dark picture is maintained umber of pulse and realizes the contrast enhancing of picture by increase, reduces the stability that bright picture applying maintenance umber of pulse realizes picture power consumption；

Technology is carried out by the various luminescence phenomenons produced in the reset in adjustment PDP display process, addressing, maintenance process, count each gray level actual displayed brightness to adjust the mapping relations of each subfield, carrying out maintaining the subfield distribution of umber of pulse by the luminosity statistics after adjusting, GTG adjustment is to realize the linear transformation of GTG in each APL situation；

The data value statistics of described APL adopts equation below:

$\mathrm{APL}\left(I(x,y)\right)=\frac{1}{C\×L}\underset{x,y}{\mathrm{\Σ}}I(x,y)$

Wherein: x is Image display position abscissa；Y is Image display position vertical coordinate；(x, y) for the brightness of this position epigraph for l；C is the columns of whole picture；L is the line number of whole picture.

In technique scheme, the APL value of described PDP screen display diagram picture is between 0～1023.

In technique scheme, described APL value is changed from the interval between 221～1000.

In technique scheme, described APL value from 221 change to 1000 time, brightness flop amplitude be incremented by is not more than 60cd/m²。

In technique scheme, the value of described APL needs dynamic statistics according to frame to carry out maintaining pulse adjustment.

In technique scheme, the curve representation formula of described APL is:

$\left\{\begin{array}{c}\mathrm{Snum}=4.02\&times;{10}^{-6}\&times;{\mathrm{Gray}}^3-7.12\&times;{10}^{-3}\&times;{\mathrm{Gray}}^2+\\ \begin{array}{cc}2.499\&times;\mathrm{Gray}+830.78,& \mathrm{Gray}\&GreaterEqual;400\end{array}\\ \begin{array}{cc}\mathrm{Snum}=1020,& \mathrm{Gray}<400\end{array}\end{array}\right.$

Wherein: Snum represents that pulse maintains number；Gray represents input gray grade.

In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:

By reduce PDP screen show low gray scale image time corresponding A PL data mark table in useless maintenance umber of pulse, it is achieved reduce PDP screen show low gray scale image power consumption purpose；

Undertaken maintaining pulse adjusting method by APL and solve the unbalanced impact that device and the stability of power supply, reliability are produced of change of power consumption during PDP dynamic image shows, being simultaneous for dark picture again can the dynamically contrast of improving picture and brightness, the quality of improving picture.

Accompanying drawing explanation

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 is that APL controls lower intrinsic brilliance and input gray level inter-stage change curve；

Fig. 2 maintains pulse to distribute result of calculation table by subfield.

Detailed description of the invention

Thinking according to the present invention, PDP screen detects the sub-field code table when showing low gray scale image from right to left line by line, produce corresponding subfield map coding schedule, specific algorithm is: when detect be 0 value time, then the numerical value of the corresponding positions in sub-field code ground chart is set to 0, when detect be 1 value time, then stop the detection of one's own profession, and by sub-field code ground chart in corresponding positions and one's own profession in this later numerical value put 1, circulate with this, until completing the detection of all row of sub-field code table, and form corresponding sub-field code ground chart.

By PDP screen show low gray scale image time tables of data be multiplied with corresponding position in sub-field code table obtained above, obtain new APL tables of data, the numerical value in this new APL tables of data be respective pixel show time pulse data value.

It is driven according to above-mentioned APL tables of data.

If the numerical value in the APL tables of data calculated is 0, and calculate that to obtain corresponding positions that numerical value in APL tables of data is 0 can value be non-zero other any fixed values, to ensure the stability of drive circuit.

PDP screen show image time be divided into lines, arrange be driven display, APL tables of data set forth in the present invention is the maintenance umber of pulse table on row cutting, sub-field code table is the coding schedule that row driving carries out for unit going into operation, sub-field code ground chart is then after the method for the employing present invention, with the coding schedule that sub-field code table has mapping relations.

The contrast of PDP and the raising of brightness mainly dynamically maintain umber of pulse and control, namely according to above-mentioned statistical result, apply more maintenance umber of pulse to strengthen to the contrast realizing picture when dark picture, apply less maintenance umber of pulse when bright picture to realize the stability of picture power consumption.

The APL Data-Statistics formula of display image is:

$\mathrm{APL}\left(I(x,y)\right)=\frac{1}{C\&times;L}\underset{x,y}{\mathrm{\&Sigma;}}I(x,y)$

Wherein: x is Image display position abscissa；Y is Image display position vertical coordinate；(x, y) for the brightness of this position epigraph for l；C is the columns of whole picture；L is the line number of whole picture.

The APL value of the entire image on PDP screen is defined as the interval of 0～1023, APL from 221 to 1000 display interval change time, although APL grade changes to 1000 from 221, but during the actual whole whole audience intrinsic brilliance amplitude of variation be incremented by be not more than 60cd/m².And PDP module power consumption is closely related with display brightness, when brightness flop is little, the power consumption of module is held essentially constant, and can well control PDP power supply module by this method so that output change is relatively stable.

The method carrying out maintaining pulse adjustment according to APL can solve the unbalanced impact that device and the stability of power supply, reliability are produced of change of power consumption during PDP dynamic image shows, being simultaneous for dark picture again can the dynamically contrast of improving picture and brightness, improving picture quality.

According to APL add up company control maintain umber of pulse number, company can adopt the various ways such as index variation, multinomial change to realize.Actual debugging process finding, the use of APL needs dynamic statistics according to frame to carry out maintaining pulse adjustment, if company's application well can not will result in the power when display dynamic menu control instability with screen cooperation, there is scintillation in whole picture.The dynamic image stability of screen and the change of power adopt following APL curve:

$\left\{\begin{array}{c}\mathrm{Snum}=4.02\&times;{10}^{-6}\&times;{\mathrm{Gray}}^3-7.12\&times;{10}^{-3}\&times;{\mathrm{Gray}}^2+\\ \begin{array}{cc}2.499\&times;\mathrm{Gray}+830.78,& \mathrm{Gray}\&GreaterEqual;400\end{array}\\ \begin{array}{cc}\mathrm{Snum}=1020,& \mathrm{Gray}<400\end{array}\end{array}\right.$

Wherein: Snum represents that pulse maintains number；Gray represents input gray grade.

Above-mentioned formula needs the adjustment doing on coefficient for different screens, realizes consistent display quality by the adjustment of coefficient.As it is shown in figure 1, by real data it can be seen that output valve corresponding to input image lightness is smoother, because luminosity determines the power supply power consumption of PDP, therefore adopt this maintenance pulse change relation to may insure that the output ratio of power supply is more uniform.

After the maintenance pulse being obtained whole image by the calculating of APL, choose one group of 10 subfield that can reduce dynamic false contour of image and maintain pulse distribution scheme: 1:2:3:6:11:19:29:40:54:90.See maintaining pulse distribution in the table in Fig. 2 according to weight.

According to adjacent pictures various flicker problem in the handover the maintenance pulse mode of each APL done on the basis of the above and repeatedly adjust.Can be implemented in after being adjusted by practical application under same APL between each GTG excessively steadily, stereovision overbalance.

The APL of PDP adjusts can dynamically improve dark picture image contrast, realize the steady output of bright picture power supply, realize the dynamic lifting of each two field picture image quality, but APL curve cannot realize the linear ratio relation between actual displayed gray level and input gray grade in same frame picture, consequently, it is possible to there is gray-scale inversion phenomenon.

In order to solve this reversal development, image must be carried out the rectification of gray-scale inversion, the method corrected is calculated mainly by the various luminescence phenomenons produced in the reset in PDP display process, searching, maintenance process, count each gray level actual displayed brightness to adjust the mapping relations of each subfield, undertaken maintaining distributing by subfield of umber of pulse by the luminosity statistics after adjusting, GTG adjusts to realize the linear transformation of GTG in each concrete APL situation, to being calculated as follows of the actual luminance of GTG:

L_u=L_pri+L_add-L_num×Num(Sus)

Wherein: Lpri is reset brightness；Ladd is addressing brightness；Lnum is for maintaining brightness；Num (Sus) is for maintaining number.

When GTG adjusts, utilize above formula to carry out front and back gray level output brightness ratio after calculating gray-scale value relatively, in time exporting brightness correspondence and be unsatisfactory for input gray grade brightness increment relation, think that this sub-field code exists gray-scale inversion problem and needs to be adjusted.After being adjusted, the gray-scale inversion problem of whole screen will eliminate, and picture quality is greatly improved.

The invention is not limited in aforesaid detailed description of the invention.The present invention expands to any new feature disclosed in this manual or any new combination, and the step of the arbitrary new method disclosed or process or any new combination.

Claims (6)

1. one kind promotes PDP image gray-scale level quality and the method reducing display power consumption, it is characterised in that comprise the following steps:

The scanning PDP screen sub-field code when showing low gray scale image, generates corresponding subfield map coding schedule successively；

By PDP screen show low gray scale image time APL tables of data be multiplied with corresponding position in above-mentioned sub-field code table, obtain new APL tables of data, the new value in APL tables of data be respective pixel show time pulse data value；

When PDP shows image, the applying of dark picture is maintained umber of pulse and realizes the contrast enhancing of picture by increase, reduces the stability that bright picture applying maintenance umber of pulse realizes picture power consumption；

It is calculated by the various luminescence phenomenons produced in the reset in adjustment PDP display process, addressing, maintenance process, count each gray level actual displayed brightness to adjust the mapping relations of each subfield, carrying out maintaining the subfield distribution of umber of pulse by the luminosity statistics after adjusting, GTG adjustment is to realize the linear transformation of GTG in each APL situation；

The data value statistics of described APL adopts equation below:

$\mathrm{APL}\left(l(x,y)\right)=\frac{1}{C\&times;L}\underset{x,y}{\mathrm{\&Sigma;}}l(x,y)$

Wherein: x is Image display position abscissa；Y is Image display position vertical coordinate；(x, y) for the brightness of this position epigraph for l；C is the columns of whole picture；L is the line number of whole picture.

2. a kind of method promoting PDP image gray-scale level quality and reduction display power consumption according to claim 1, it is characterised in that the APL value of described PDP screen display diagram picture is between 0～1023.

3. a kind of method promoting PDP image gray-scale level quality and reduction display power consumption according to claim 2, it is characterised in that described APL value is changed from the interval between 221～1000.

4. according to claim 3 a kind of promote PDP image gray-scale level quality and the method reducing display power consumption, it is characterised in that described APL value from 221 change to 1000 time, brightness flop amplitude is incremental is not more than 60cd/m²。

5. a kind of method promoting PDP image gray-scale level quality and reduction display power consumption according to claim 1, it is characterised in that the value of described APL needs dynamic statistics according to frame to carry out maintenance pulse adjustment.

6. a kind of method promoting PDP image gray-scale level quality and reduction display power consumption according to claim 5, it is characterised in that the curve representation formula of described APL is:

$\left\{\begin{array}{cc}\mathrm{Snum}=4.02\&times;{10}^{-6}\&times;{\mathrm{Gray}}^3-7.12\&times;{10}^{-3}\&times;{\mathrm{Gray}}^2+& \\ 2.499\&times;\mathrm{Gray}+830.78,& \mathrm{Gray}\&GreaterEqual;400\\ \mathrm{Snum}=1020,& \mathrm{Gray}<400\end{array}\right.$

Wherein: Snum represents that pulse maintains number；Gray represents input gray grade.