CN100371970C - Adaptive high contrast drive control device and method for plasma display panel - Google Patents
Adaptive high contrast drive control device and method for plasma display panel Download PDFInfo
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Abstract
The present invention discloses a self-adaptive high contrast drive control device and a method of a plasma display, which dynamically regulates a subfield display mode of a next frame image according to the brightness levels of a plurality of input frame images. The self-adaptive high contrast drive control device has a self-adaptive high contrast drive function and comprises a subfield number, a maintaining pulse number and the distribution intensity of inclined wave wiping and removing pulses. Besides, logic control waveshapes are generated by the methods of looking up a meter and controlling time delay, and the present invention can be conveniently and directly applied to an AC PDP control system as an embedding type system so as to realize image display and control functions of suppressing dynamic false contour phenomenon and strengthening image contrast. The device of the present invention realizes the complicated high contrast self-adaptive control function by using few logic resources and uses a segment type parameterized waveshape state storage structure to make control waveshape design flexible and simple. The present invention has positive significance for effectively shortening the development cycle of the waveshape design of the AC PDP control system and reducing development cost.
Description
Technical field
The present invention relates to a kind of AC PDP control method and device that the self-adaptation high-contrast drives function that have, belong to logic control field in the gas discharge technology, particularly relate to a kind of device and method that produces the drive waveforms of corresponding high-contrast by the statistical picture average brightness level.
Background technology
AC plasma display (AC Plasma Display Panel is hereinafter to be referred as AC PDP) utilizes gas discharge to realize that image shows in giant-screen flat pannel display field huge competitive power is arranged.At present, ACPDP generally adopts how sub-field technology to realize that the multi-grayscale of image shows, being about to a two field picture is divided into a plurality of sons and shows, 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 (corresponding in the circuit realization is the number of times of keeping discharge pulse).
Adopting sub-field technology to realize in the display device of multi-grayscale, the brightness and contrast of raising display image is the very important problem that people improve the plasma display image quality.Propose at present several different methods and improved the brightness and contrast that image shows.As the ALIS driving method (Alternate Lighting of Surfaces method) that FHP company proposes, this method has also improved brightness when promoting clearness.NEC, three magnitude companies adopt peak brightness Enhancement Method (Peak LuminanceEnhancement is called for short PLE) to be used for improving contrast.PANASONIC adopts adaption brightness control technology (Adaptive Brightness Intensify is called for short Plasma AI) to improve peak brightness and contrast.Wherein, adaption brightness control method is adjusted sub-number of fields and sub-field pulse number according to the luminance level of image itself, is reducing aspect dynamic false contours and the increase image demonstration contrast remarkable advantages is arranged.
Based on a son separation display technique, the ultimate principle of adaption brightness control is: the luminance level of some two field pictures of statistics front, to this luminance level divided rank; When statistics picture average brightness level is low, reduces the sub-number of fields order of present frame, and then can increase the led pulse sum; This moment, so dynamic false contour is not obvious, the increase of led pulse sum can also strengthen the contrast of image because average brightness level is lower.On the contrary, when statistics picture average brightness level is higher, increase the sub-number of fields order of present frame; Sub-number of fields order increases, and owing to the time of initial period, address period and erasing period in every son field is all constant, will inevitably reduce the T.T. of the phase of keeping, and then reduce total umber of pulse of keeping, and the brightness of image level of present frame is decreased.Simultaneously, the increase of sub-number of fields purpose makes weight uniform distribution of each son under the same grayscale grade, thereby dynamic false contour is effectively suppressed.
In AC PDP display device field, adaption brightness control method mainly realizes by producing the logical controlling waveform.Traditional adaption brightness control method is divided into several grades with the brightness of image complanation, and each grade is corresponding to a kind of sub-field mode, and the logical control waveform data storage of every kind of sub-field mode is in a look-up table; Determine the sub-field mode of current frame image by the luminance level statistics of the some two field pictures in front, select a corresponding Wave data look-up table then, obtain the logical controlling waveform.Like this, a plurality of look-up tables will inevitably take a lot of logical resources, and design or also very complicated when revising waveform.
Simultaneously, in traditional adaption brightness control method, the most significant digit of the Wave data in the Wave data look-up table (referring to binary number here) is set at waveform state delay sign, is the time-delay of waveform state or waveform state in order to judge this Wave data.Like this, must add more corresponding modules in the waveform address generation module judges and handles Wave data.This is also very unfavorable to design and modification logical control waveform.
In addition, in traditional adaption brightness control method, preparatory stage, address period in the son, the waveform status data of keeping phase, erasing period are storages continuously, middle not at interval; In design, if increase or reduce one or several logical control waveform status data, then the sequence number of all waveform status data in back all needs to adjust.Be unfavorable for so very much design fast and adjust logical control waveform.
Simultaneously, the brightness that reduces display screen backgrounds light can effectively improve contrast, generally adopts the oblique wave pulse to replace big erasing pulse on the scan electrode, thereby improves contrast.Traditional adaption brightness control method is not still controlled the quantity and the distribution of oblique wave erasing pulse, so can not further improve contrast by controlling sub-number of fields and keeping the brightness that umber of pulse improves display image mid point bright area.
Summary of the invention
The objective of the invention is to propose a kind of a kind of plasma display self-adaptation high-contrast driving control device and method that the self-adaptation high-contrast drives function that have, these apparatus and method are dynamically adjusted a son display mode of next frame image according to the luminance level of some two field pictures of input, comprise sub-number of fields, keep the distribution density of umber of pulse and oblique wave erasing pulse, and produce logical control waveform by the method for tabling look-up and control time-delay, can be applied directly in the AC PDP control system as embedded system easily, realize having the image presentation control function that suppresses dynamic false contour and strengthen picture contrast.
To achieve these goals, the technical solution used in the present invention is: a kind of plasma display self-adaptation high-contrast driving control device is characterized in that this device comprises:
A brightness of image statistical module A, this module comprises a counting module, four 8 bit shift register and totalizers of connecting step by step mutually; Counting module is connected with the first order 8 bit shift register, and four 8 bit shift register of connecting step by step mutually are connected with totalizer respectively;
A logical control waveform address generating module B, this module is corresponding with sub-field wave shape attitude data look-up table E, be used for producing preparatory stage, address period respectively, keep the control signal waveform in phase and each stage of erasing period, keep the recurrent pulses of phase thereby produce; Simultaneously, this module determines whether waveform transformation to next waveform state according to the output of waveform state time delay expansion judge module;
A control waveform pattern look-up table D is used to store the different wave pattern-coding of each son field;
Umber of pulse look-up table E is kept in a son field, and the difference that is used to store under the various sub-field modes is kept umber of pulse, here corresponding the and brightness of image level code of sub-field mode;
A sub-field wave shape attitude data look-up table F, each different conditions that is used for the stored logic control waveform, this table is stored in different physical address sections respectively according to preparatory stage, address period, the waveform state of keeping phase and erasing period four-stage, leave certain space between each section, use when revising the waveform state for future;
A waveform state delay look-up table G is used to store the delay data of each different wave state, and is corresponding one by one with the data among the sub-field wave shape attitude data look-up table F;
A waveform state time delay expansion judge module C, this module produces waveform state time delay expansion judgement signal according to the output of waveform state delay look-up table;
Brightness of image statistical module A is connected with logical control waveform address generating module B, logical control waveform address generating module B keeps umber of pulse look-up table E with waveform state time delay expansion judge module C, control waveform pattern look-up table D, Zi Chang respectively, sub-field wave shape attitude data look-up table F, waveform state delay look-up table G are communicated with, wherein waveform state time delay expansion judge module C is connected with waveform state delay look-up table G, and data are exported by sub-field wave shape attitude data look-up table F.
Adopt the plasma display self-adaptation high-contrast drive controlling method of said apparatus, dynamically adjust a son display mode of next frame image according to the luminance level of some two field pictures of importing, comprise sub-number of fields, keep the distribution density of umber of pulse and oblique wave erasing pulse, the mode of employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, and with in each waveform state data storage to a look-up table; Produce logical control waveform by the method for tabling look-up and control time-delay, the status data of control waveform and corresponding delay data separate storage.
The device of this aspect can adopt the fpga chip of low side to realize, only need join a simple printed circuit board (PCB), the program storage that fpga chip is supporting, and several interface components and parts and corresponding VHDL language program can realize.
Device of the present invention uses considerably less logical resource can realize complicated high-contrast adaptive control function, and has adopted sectional type, parameterized waveform state storage organization, makes control waveform flexible design, simple.Adopt the present invention for the construction cycle that shortens the design of AC PDP control waveform, effectively reducing cost of development all has positive meaning.
Description of drawings
Fig. 1 is a composition module relationship block diagram of the present invention, A presentation video brightness statistic wherein, B presentation logic control waveform address generating module, C represents waveform state time delay expansion judge module, D represents control waveform pattern look-up table, E represents that the umber of pulse look-up table is kept in the son field, F represents sub-field wave shape attitude data look-up table, and G represents waveform state delay look-up table.
Fig. 2 is the inner structure block diagram of brightness of image statistical module;
Fig. 3 is the counting module structured flowchart in the brightness of image statistical module;
Fig. 4 is the data store organisation synoptic diagram in the sub-field wave shape attitude data look-up table, horizontal ordinate express time wherein, and ordinate is represented the address of look-up table;
The embodiment that provides below in conjunction with accompanying drawing and inventor is described in further detail the present invention.
Embodiment
A kind of plasma display self-adaptation high-contrast driving control device of the present invention as shown in Figure 1, this device comprises:
A brightness of image statistical module A, its inner structure as shown in Figure 2.Comprising a counting module Counter, four 8 bit shift register Dff, a totalizer.Counting module Counter counts high two of all sub-pixels in every frame image signal, and carries out the weighted sum computing, exports 8 counting structures; Four shift register Dff carry out cascade, are shifted at the falling edge of field sync signal; Totalizer ADDer carries out the arithmetic mean computing to the output of four Dff, obtains the statistics of brightness of image statistical module A, i.e. the brightness of image level code.
Wherein, the inner structure of counting module Counter as shown in Figure 3.The resolution of supposing image is m*n, and the brightness of 1 two field picture is divided into L luminance level, and then counter CountH and CountL are set to N system counter and 2N system counter respectively, N=mn/L here, and its carry output is as the counting clock of counter CountS.Counter CountS is set to the L+1 system, and its output is given totalizer ADDer and carried out additive operation.The coding of the luminance level of the output of the totalizer ADDer current frame image that to be exactly this module estimate according to 1 frame image data.
A logical control waveform address generating module B, this module is corresponding with sub-field wave shape attitude data look-up table, be provided with preparatory stage, address period respectively, keep the start address and the end address marking signal of phase and erasing period, according to these signs, produce the control signal waveform in each stage respectively.This module reads sub the data of keeping in the umber of pulse look-up table according to brightness of image level code signal, keeps the recurrent pulses of phase thereby produce.Simultaneously, this module determines whether waveform transformation to next waveform state according to the output of waveform state time delay expansion judge module.
A control waveform pattern look-up table D stores the different wave pattern-coding of each son field.The logical control waveform address generating module reads waveform pattern according to the statistics of brightness of image statistical module at the place that begins of each son field, determines whether this child field produces erasing period, preparatory stage, address period and keep the waveform of phase.
Umber of pulse look-up table E is kept in a son field, and the difference of storing under the various sub-field modes is kept umber of pulse, here corresponding the and brightness of image level code of sub-field mode.
A sub-field wave shape attitude data look-up table F, each different conditions of stored logic control waveform, the output of this look-up table also is the output of native system.As shown in Figure 4, this table is stored in different physical address sections respectively according to preparatory stage, address period, the waveform state of keeping phase and erasing period four-stage, leaves certain space between each section, uses when revising the waveform state in the future.
A waveform state delay look-up table G stores the delay data of each different wave state, and is corresponding one by one with the data in the sub-field wave shape attitude data look-up table.
A waveform state time delay expansion judge module C judges signal according to the output generation waveform state time delay expansion of waveform state delay look-up table.
A system program config memory, the back that powers on is given the system loads program automatically.
Brightness of image statistical module A is connected with logical control waveform address generating module B, logical control waveform address generating module B keeps umber of pulse look-up table E with waveform state time delay expansion judge module C, control waveform pattern look-up table D, Zi Chang respectively, sub-field wave shape attitude data look-up table F, waveform state delay look-up table G are communicated with, wherein waveform state time delay expansion judge module C is connected with waveform state delay look-up table G, and data are exported by sub-field wave shape attitude data look-up table F.
The plasma display self-adaptation high-contrast drive controlling method of device, dynamically adjust a son display mode of next frame image according to the luminance level of some two field pictures of importing, comprise sub-number of fields, keep the distribution density of umber of pulse and oblique wave erasing pulse, the mode of employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, and with in each waveform state data storage to a look-up table; Produce logical control waveform by the method for tabling look-up and control time-delay, the status data of control waveform and corresponding delay data separate storage.
The method that the statistics of display image luminance level is taked is: by the brightness of image statistical module all sub-pixels in the luminance level signal of some two field pictures are added up, and carry out the weighted sum computing, estimate the luminance level of next frame image and provide corresponding brightness of image level code with this.
The mode of employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, be with in each waveform state data storage to a look-up table, adopt a logical control waveform address generating module that this look-up table is carried out addressing, export each logical control waveform state.
The mode of employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, be with preparatory stage, address period, keep the logical control waveform state storage of phase and erasing period in four of a look-up table different segmentations, and the address of each section does not have overlapping, and is simultaneously discontinuous yet.
The logical control waveform address generating module is used for producing the look-up table address of keeping umber of pulse according to the statistics of brightness of image statistical module; Spread signal according to the value of keeping the umber of pulse look-up table and waveform state time delay expansion judge module produces the logical control waveform address.
Suppose that each pixel of image is made up of R, G, three sub-pixels of B, each sub-pixel is represented by 8 bits, can the gray-scale displayed grade be 256, and resolution is m*n; The luminance level of supposing 1 two field picture is divided into 64 grades.So, can realize 64 kinds of sub-field modes, promptly can realize the conversion of 8 seed number of fields, every seed number of fields correspondence is respectively kept umber of pulse for 8 kinds.But the luminance level of considering real image changes slower, so it is just enough that the luminance level of 1 two field picture is divided into 32 grades.
The principle of key diagram image brightness statistical module at first.For an eight-digit binary number, its highest two have accounted for 75% weight, so R, G, B high two are added up the luminance level of token image substantially just, and relatively simple for structure, structure as shown in Figure 2.CountH and CountL are respectively the up counter (N=mn/64 here) of N system and 2N system, and the carry end is as the counting input of back counter CountS.With R7 is example, is ' 1 ' when counter CountH detects R7 during at rising edge clock, CountH counting then, otherwise do not count; When CountH count down to N, its output carry end c was become ' 1 ' by ' 0 '; Counter CountS detects the carry end c of CountH when rising edge clock, then count when detecting c for ' 1 ', otherwise do not count; Like this, the count value among the CountS just can be represented the luminance level of R7.Because the difference of weight, CountH is a N system counter, and CountL is the 2N system; So the count results addition of 6 CountS just obtains corresponding brightness of image level.
Be that core illustrates the whole system operation principle with logical control waveform address generating module (abbreviation address generating module) below, as shown in Figure 1.Address generating module is started working at the rising edge of field sync signal, produces initial address, i.e. preparatory stage start address is as Fig. 4; Simultaneously, read the waveform pattern coding of this child field at this place, address.The waveform coding table is set to 6, represents respectively whether erasing period, preparatory stage 1, preparatory stage 2, address period, the phase of keeping occur in the son field, and " 1 " expression occurs, and " 0 " expression does not occur for high 5; Lowest order represents whether this child field is last height field in, the son field that " 1 " expression is last, and " 0 " expression is not last height field.When carrying out the beginning of certain waveform phase, program judges corresponding zone bit, if " 1 " then order execution produces corresponding waveform, if " 0 " then jumps to the starting position of next waveform phase.
Program is before address period finishes, and address generating module is kept the umber of pulse of keeping that reads this child field the umber of pulse look-up table according to the statistics of brightness of image statistical module from the son field, as the counting initial value of being kept pulse the phase of keeping; After address period finished, address generating module jumped to the address and keeps the phase start address; Because keeping the characteristics of phase is that an irregular broad pulse is respectively arranged in front and back, middle some pulses are recurrent pulses, so waveform is divided into three sections storages; Equally, after the phase of keeping finishes, the control waveform address that produces erasing period.The control waveform data are exported by sub-field wave shape attitude data look-up table, and wherein the time-delay length of each waveform state is then represented by corresponding value in the waveform state delay look-up table.Waveform state time delay expansion judge module carries out subtraction counting to this value, and when counting was 0, the output time-delay finished to judge that signal ext_end is 1, and address generating module is just to allow to produce next control waveform address at 1 o'clock at this signal only.
Wherein, statistical module averages luminance level statistics to 16 field picture data, and statistics is used for selecting corresponding sub-number of fields and keeping umber of pulse on the one hand, makes sub-number of fields and keep umber of pulse and change along with the variation of statistics.When the brightness of image level is low, adopt less sub-number of fields and the bigger umber of pulse of keeping, can improve the peak brightness of image like this; When the brightness of image level is higher, adopt more sub-number of fields and the less umber of pulse of keeping, like this power of Xiao Haoing just can appropriate balance some, the while can reduce the dynamic false contour of luminance level easy appearance when higher.On the other hand, statistics is used for selecting the distribution pattern of big erasing pulse in 16, and is as shown in table 1.
Wipe the distributed wave table greatly in the table 1:16 two field picture waveform;
When the brightness of image level is low, adopt less big wiping rapid pulse to dash, can reduce the not brightness of viewing area like this, thereby improve contrast; During such as full frame black, adopt 8 equally distributed big erasing pulses in 16, adopt 15 big erasing pulses in 16 during full frame white, when the intermediate luminance level, adopt 9～14 equally distributed big erasing pulses respectively in 16.
Like this, by identical control method, as long as the data of adjusting among look-up table D, E, F, the G just can produce logical control waveform desirable, that have the adaption brightness control function.
Claims (7)
1. plasma display self-adaptation high-contrast driving control device is characterized in that this device comprises:
A brightness of image statistical module (A), this module comprise a counting module, four 8 bit shift register and totalizers of connecting step by step mutually; Counting module is connected with the first order 8 bit shift register, and four 8 bit shift register of connecting step by step mutually are connected with totalizer respectively;
Individual logical control waveform address generating module (B), this module is corresponding with sub-field wave shape attitude data look-up table (E), be used for producing preparatory stage, address period respectively, keep the control signal waveform in phase and each stage of erasing period, keep the recurrent pulses of phase thereby produce; Simultaneously, this module determines whether waveform transformation to next waveform state according to the output of waveform state time delay expansion judge module;
A control waveform pattern look-up table (D) is used to store the different wave pattern-coding of each son field;
Umber of pulse look-up table (E) is kept in a son field, and the difference that is used to store under the various sub-field modes is kept umber of pulse, here corresponding the and brightness of image level code of sub-field mode;
A sub-field wave shape attitude data look-up table (F), each different conditions that is used for the stored logic control waveform, this table is stored in different physical address sections respectively according to preparatory stage, address period, the waveform state of keeping phase and erasing period four-stage, leave certain space between each section, use when revising the waveform state for future;
A waveform state delay look-up table (G) is used to store the delay data of each different wave state, and is corresponding one by one with the data among the sub-field wave shape attitude data look-up table F;
A waveform state time delay expansion judge module (C), this module produces waveform state time delay expansion judgement signal according to the output of waveform state delay look-up table;
Brightness of image statistical module (A) is connected with logical control waveform address generating module (B), logical control waveform address generating module (B) is kept umber of pulse look-up table (E), sub-field wave shape attitude data look-up table F, waveform state delay look-up table (G) with waveform state time delay expansion judge module (C), control waveform pattern look-up table (D), son field respectively and is communicated with, wherein waveform state time delay expansion judge module (C) is connected with waveform state delay look-up table (G), and data are exported by sub-field wave shape attitude data look-up table (F).
2. device as claimed in claim 1 is characterized in that, described counting module is counted high two of all sub-pixels in every frame image signal, and carries out the weighted sum computing, exports 8 counting structures; Four shift registers are shifted at the falling edge of field sync signal; Totalizer (A) is carried out the arithmetic mean computing to the output of four shift registers, obtains the statistics of brightness of image statistical module (A).
3. device as claimed in claim 1 is characterized in that, described counting module is divided into N system counter and 2N system counter.
4. plasma display self-adaptation high-contrast drive controlling method, it is characterized in that, this method adopts the described device of claim 1, dynamically adjust a son display mode of next frame image according to the luminance level of some two field pictures of importing, comprise sub-number of fields, keep the distribution density of umber of pulse and oblique wave erasing pulse, the mode of employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, and with in each waveform state data storage to a look-up table; Produce logical control waveform by the method for tabling look-up and control time-delay, the status data of control waveform and corresponding delay data separate storage.
5. method as claimed in claim 4, it is characterized in that, the mode of said employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, be with in each waveform state data storage to a look-up table, adopt a logical control waveform address generating module that this look-up table is carried out addressing, export each logical control waveform state.
6. as claim 4 or 5 described methods, it is characterized in that, the mode of said employing segmentation is stored preparatory stage, address period in the son field respectively, is kept the logical control waveform state of phase and erasing period, be with preparatory stage, address period, keep the logical control waveform state storage of phase and erasing period in four of a look-up table different segmentations, and the address of each section does not have overlapping, and is simultaneously discontinuous yet.
7. method as claimed in claim 5 is characterized in that: said logical control waveform address generating module is used for producing the look-up table address of keeping umber of pulse according to the statistics of brightness of image statistical module; Spread signal according to the value of keeping the umber of pulse look-up table and waveform state time delay expansion judge module produces the logical control waveform address.
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| CN1375814A (en) * | 2001-03-15 | 2002-10-23 | 三星电子株式会社 | Liquid-crystal display with self-adaptive brightness intensifying device function and its driving method |
| JP2004117484A (en) * | 2002-09-24 | 2004-04-15 | Matsushita Electric Ind Co Ltd | Video signal processing circuit |
| JP2004348119A (en) * | 2003-04-28 | 2004-12-09 | Matsushita Electric Ind Co Ltd | Gray scale display device |
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| CN1375814A (en) * | 2001-03-15 | 2002-10-23 | 三星电子株式会社 | Liquid-crystal display with self-adaptive brightness intensifying device function and its driving method |
| JP2004117484A (en) * | 2002-09-24 | 2004-04-15 | Matsushita Electric Ind Co Ltd | Video signal processing circuit |
| JP2004348119A (en) * | 2003-04-28 | 2004-12-09 | Matsushita Electric Ind Co Ltd | Gray scale display device |
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Effective date of registration: 20070720 Address after: 621000, No. 35 Mian Xing Dong Road, hi tech Zone, Sichuan, Mianyang Applicant after: Sichuan Sterope Orion Display Co., Ltd. Address before: 712021 No. 1 Rainbow Road, Shaanxi, Xianyang Applicant before: IRICO Group Electronics Co., Ltd. |
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