CN1750090A

CN1750090A - Method for improving dark field image quality of color plasma display screen

Info

Publication number: CN1750090A
Application number: CNA2005100961743A
Authority: CN
Inventors: 王付生
Original assignee: Irico Group Electronics Co Ltd
Current assignee: Sichuan Sterope Orion Display Co., Ltd.
Priority date: 2005-10-14
Filing date: 2005-10-14
Publication date: 2006-03-22

Abstract

The method of improving dark field image quality of color plasma display screen includes the following steps: A. detecting input image data with the detector and judging whether the highest one or two bits of the image data in the whole screen are 0; B. for the image of the all-0 or dark image frame, feeding the image data from the detector to the searcher to alter the code of the low grey level image according to the stored inverse gamma converted code and feeding the converted data to the controller; and feeding the image data from the detector to the pulse controller to alter the weight of the sub-field and feeding the altered data to the controller; and C. feeding the image data to the XY driver and the A driver to drive the plasma display screen with the controller, based on the code of the searcher and sub-field weight pulse data of the pulse controller and in proper data format.

Description

A kind of method that improves dark field image quality of color plasma display screen

Technical field.

The present invention relates to a kind of method of improving image quality of color plasma display panel, particularly a kind of method that improves dark field image quality of color plasma display screen.

Background technology:

AC PDP[AC plasma display screen] principle that shows is to adopt how sub-field technology to realize multi-grey level, one two field picture is divided into a plurality of sons field to be realized, different son fields have different weights, the son field of different weights can realize that by sub combination to different weights many grades gray scale of image shows corresponding to different luminance weights.Shu Ru signal gray-scale value is with the linear (see figure 1) of the brightness of display image like this, the principle of AC PDP display image is different from CRT, the brightness that CRT shows is the non-linear (see figure 2) that concerns with the signal value that receives, because the vision signal of transmission is at CRT at present, for the effect that can show on AC PDP equates with CRT, need be proofreaied and correct by the digital signal that the analog signal conversion of importing becomes, this process is commonly referred to anti-gamma conversion.

When carrying out anti-gamma conversion, the low gray level of details in a play not acted out on stage, but told through dialogues can be less, cause the expressive force of image when low gray scale not strong (as shown in Figure 3), for example, when details in a play not acted out on stage, but told through dialogues, should show by 10 gray levels, but only also have three gray levels when carrying out anti-gamma conversion, cause this width of cloth image can only be by three gray level expressings when details in a play not acted out on stage, but told through dialogues, the image level sense be not strong.Though the existing method that has some to strengthen low gray scale expressive force, such as son increasing pulse number and method that adopts error diffusion or the like in low weight, but these methods cause the contrast of entire image to descend easily, or might when hanging down gray scale, brightness surpass high grade grey level, easily cause the distortion of image.

Summary of the invention:

The purpose of this invention is to provide the stereovision of a kind of AC of improvement PDP image when details in a play not acted out on stage, but told through dialogues, remedy the not strong shortcoming of details in a play not acted out on stage, but told through dialogues image expressive force, improve the method for the quality of image.

For achieving the above object, the present invention takes following technical scheme to be achieved:

The principle of the inventive method is to utilize different anti-gamma transformation curves, adopts how sub-field technology to realize that the multi-grayscale of image shows.By detection to incoming video signal, if full-screen image is dark image, be that one or two big son field of weight do not need to light, then the full frame like this image that is in low gray level is handled, the luminous weight that changes its son field is improved the quality of display image, strengthens the expressive force when hanging down gray level.

The present invention comprises the steps: for the method that improves the full frame dark field image quality of AC PDP

A) detect the view data of importing by detecting device earlier, directly judge the highest or two of input image data, judge whether this or two all be zero for full frame input data;

B) data as if input all are zero in the above-mentioned steps, the image that this frame then is described is dark image, to finger, the coding schedule of finger after according to the anti-gamma conversion of its storage changes the coding of low grayscale image to detecting device with data delivery, and gives controller with the data after the conversion; Meanwhile, also will deliver to the weight that impulse controller changes the son field from the data that detecting device comes out, the data delivery after the change is to controller;

C) controller to be fit to the data layout of plasma panel, is given XY driver and A driver according to a son weight pulse data output of the coding of finger and impulse controller respectively, drives plasma panel.

Described finger is a coding schedule after the anti-gamma conversion of storage, and it changes low gray level coding according to different anti-gamma curves; Described impulse controller is the controller of son weight of remapping, and the pulse data table of two kinds of different weights is arranged in this controller, selects the weight of which son to work according to detector result; Impulse controller changes a son weight by changing or keeping umber of pulse and realize.

The advantage of the inventive method is, because the son weight in the different grey-scale section of correspondence is different during anti-gamma conversion, utilize a coding schedule after the anti-gamma conversion of storage, the coding mode that changes the son field comes a corresponding new son weight ratio, make less weight is arranged when hanging down gray level, different low gray level differentiation can be come out like this, thus the stereovision of image when having improved details in a play not acted out on stage, but told through dialogues.Detect the expressive force of revising darkfield image by such judgement, the quality of image can access bigger enhancing.

Description of drawings:

When Fig. 1 was the CRT display image, the input signal gray-scale value was with the graph of a relation of brightness value.

When Fig. 2 was the PDP display image, the gray-scale value of input signal was with the graph of a relation of brightness value.

Fig. 3 is that gray-scale value after the anti-gamma conversion is with the graph of a relation of brightness value.

Fig. 4 is the step block diagram of the inventive method.

Fig. 5 is the graph of a relation of the inventive method anti-gamma conversion gray level and coding.

Embodiment

The present invention is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 4, a kind of method that improves the full frame dark field image quality of AC PDP comprises the following steps:

A) detect the view data of importing by detecting device 100 earlier, directly judge the highest or two of input image data, judge whether this or two all be zero for full frame input data;

B) data as if input all are zero in the above-mentioned steps, the image that this frame then is described is low grayscale image, detecting device 100 arrives finger 200 with data delivery, make the decision of searching which coding schedule, promptly select which map table to work according to the testing result of detecting device 100, allow data export, and give controller 400 data after the conversion; Meanwhile, also to deliver to impulse controller 300 from the data that detecting device 100 comes out, if the low image of gray level, impulse controller 300 will change a son weight (pulse data table that two kinds of different weights are arranged in the impulse controller 300, select the weight of which son field to work according to the testing result of detecting device 100), the data delivery after the change is to controller 400.

C) controller 400 to be fit to the data layout of plasma panel, is given XY driver 500 and A driver 600 according to a son weight pulse data output of the coding of finger 200 and impulse controller 300 respectively, drives plasma panel 700.

Above-mentioned impulse controller 300 a change weight are kept umber of pulse by variation and are realized.

Finger 200 is coding schedules after the anti-gamma conversion of storage, the son weight in the different grey-scale section of correspondence is different during anti-gamma conversion, low gray level (be exactly high one or two of view data be 0 gray scale, to 8 bit images, below 00111111 gray scale can be by the calculating of low gray scale) time less weight is arranged, different low gray level differentiation can be come out like this.A concrete embodiment is, the image that one frame is 8 is with 8 sub, the weight ratio of son field is 1: 2:: 4: 8: 16: 32: 64: 128, then when the high grade grey level that detects image is 00111111, weight of latter two high son just becomes 0.25 and 0.5, at this moment the coding mode that also needs to change the son field comes a corresponding new son weight ratio, if the highest gray level is 11111111, then need not change current weight ratio.

According to top described, the change of low gray level coding is to get according to different anti-gamma curves, because when hanging down gray level, can know by the characteristic of anti-gamma curve, low gray scale is not easy difference and comes, at this moment to launch the curve of low gray level, promptly not according to 1: 2: 4: 8: 16: 32: 64: 128 such proportion, but according to 0.25: 0.5: 1: 2: 4: 8: encode at 16: 32, so just can branch away low gray level with different code areas, as shown in the table:

As shown in Figure 5, the gray level of gray level below 10 can only be come out with a kind of code identification when anti-gamma curve II, anti-gamma curve I then can also indicate gray level 5, and gray level just can have two code identifications below 10 like this, has increased the coding of low gray level thus.

Claims

1. method that improves dark field image quality of color plasma display screen, it is characterized in that: it comprises the steps:

A) detect the view data of importing by detecting device (100) earlier, directly judge the highest or two of input image data, judge whether this or two all be zero for full frame input data;

B) data as if input all are zero in the above-mentioned steps, the image that this frame then is described is low grayscale image, detecting device (100) arrives finger (200) with data delivery, the coding schedule of finger (200) after according to the anti-gamma conversion of its storage changes the coding of low grayscale image, and gives controller (400) with the data after the conversion; Meanwhile, also will deliver to the weight that impulse controller (300) changes the son field from the data that detecting device (100) comes out, the data delivery after the change is to controller (400);

C) controller (400]) to be fit to the data layout of plasma panel, is given XY driver (500) respectively and A driver (600) drives plasma panel (700) according to a son weight pulse data output of the coded data of finger (200) and impulse controller (300).

2. the method for raising dark field image quality of color plasma display screen according to claim 1, it is characterized in that, the low grayscale image coding of described change obtains according to anti-gamma curve, its method is, the anti-gamma curve of low gray level is launched, promptly not according to 1: 2: 4: 8: 16: 32: 64: 128 a son weight ratio, but by 0.25: 0.5: 1: 2: 4: 8: a son weight of 16: 32 is recently encoded, and was as shown in the table:

3. the method for raising dark field image quality of color plasma display screen according to claim 1, it is characterized in that, the described weight that changes the son field, its method is, when detecting device (100)] when the high grade grey level that detects image is 00111111, will change weight of latter two high son into 0.25 and 0.5; When the gray level that detects image is 11111111, then needn't change current weight ratio, promptly to the high grade grey level image, a son weight ratio is 1: 2: 4: 8: 16: 32: 64: 128.

4. the method for raising dark field image quality of color plasma display screen according to claim 1 is characterized in that, described impulse controller [300] changes a son weight by changing or keeping umber of pulse and realize.