CN103685865A - Image motion state detection method for LCD (Liquid Crystal Display) driving chip - Google Patents
Image motion state detection method for LCD (Liquid Crystal Display) driving chip Download PDFInfo
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- CN103685865A CN103685865A CN201310718668.5A CN201310718668A CN103685865A CN 103685865 A CN103685865 A CN 103685865A CN 201310718668 A CN201310718668 A CN 201310718668A CN 103685865 A CN103685865 A CN 103685865A
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Abstract
The invention provides an image motion state detection method for an LCD (Liquid Crystal Display) driving chip, wherein a current image to be detected is divided into a plurality of continuous frame images. The method comprises the following steps: setting a CRC (Cyclic Redundancy Check) code value of the previous frame image of the current frame image to be a preset definite quantity; reading the data of the current frame image; calculating the CRC code value of the current frame image; judging whether the CRC code value of the current frame image is equal to the CRC code value of the previous frame image; if yes, judging the current image is a still image; if not, judging the current image is a moving image; updating the CRC code value of the previous frame image into the CRC code value of the current frame image; judging whether the image display is ended; if the image display is not ended, carrying out the second step after the first step is returned, and circulating; if the image display is ended, ending the whole procedure. The method enables the LCD driving chip to detect the motion state at the displayed image, and lays a foundation for realizing low power consumption characteristic and some image processing functions.
Description
Technical field
The present invention relates to image analysis technology and circuit is realized field, specifically, the present invention relates to a kind of image motion condition detection method that drives chip for LCD.
Background technology
Along with the fast development of electronics, the communication technology, the various mobile terminals with LCD display (as mobile phone, panel computer, e-book etc.) are progressively universal, and the size of the LCD display of using is also increasing, and resolution is more and more higher.In this case, the power consumption of LCD display is also increasing, has occupied the sizable proportion of Overall Power Consumption.Therefore, reduction LCD display power consumption is significant for the application of mobile terminal.
Because the power consumption of LCD display is mainly from back lighting, a common method that reduces LCD display power consumption is to reduce backlight illumination.And decline because backlight illumination reduces for the display brightness of image is unlikely to, can be by suitably increasing digitized color of image value (as rgb value).Certainly, this image processing operations can reduce image displaying quality.It is larger that color of image value increases multiple, and image displaying quality declines more.
In the method for above-mentioned reduction LCD display power consumption, when choosing color of image value multiple can be increased, generally to consider the kinetic characteristic of consecutive image.When the consecutive image showing is rest image, because human eye is high to the sensitiveness of rest image display quality, color of image value increases multiple should get smaller value.And when consecutive image is moving image, because human eye is relatively low to the sensitiveness of moving image display quality, color of image value increases the desirable higher value of multiple, thereby obtain better power savings.As can be seen here, consecutive image kinetic characteristic is differentiated and will be contributed to further to reduce the power consumption of LCD display system.
LCD display system for mobile terminal is broadly divided into graphic process unit (GPU) 101, LCD drives chip 102 and LCD display 103 3 parts (as shown in Figure 1).LCD drives chip 102 to play function served as bridge between GPU101 and LCD display 103.It receives on the one hand from the data image signal of GPU101 and display control signal, and output pixel drive voltage signal and line scanning control signal, to LCD display 103, realize the correct demonstration of image on the other hand.In LCD display system, the differentiation of consecutive image kinetic characteristic is generally driven in chip 102 and carried out at LCD.
In the prior art early stage with GRAM(the random asccess memory for memory image) LCD drive chip (as shown in Figure 2), consecutive image kinetic characteristic is differentiated and is easy to realization.This LCD drives chip to comprise GRAM201, pixel drive voltage produces circuit 202 and line scanning control signal generation circuit 203.Because GRAM201 can store demonstration image, GPU(is not shown) must to LCD, not drive chip to transmit view data by the scanning frequency of LCD display (not shown).Only have when display image content changes, GPU just can refresh the data of storing in GRAM201.Therefore, LCD drives chip to need only according to GPU the write control signal to GRAM201, and can differentiate GPU and have or not the write activity to GRAM201, thus the motion state of judgement image.When LCD drives chip detection, to GPU, GRAM201 is had to write control signal, can judge that GPU has carried out the write operation to GRAM201, thereby can conclude that demonstration image is moving image.Otherwise, can conclude and show that image is rest image.
And along with LCD display resolution is more and more higher, LCD drives the GRAM capacity in chip increasing, cause LCD to drive chip cost to rise more.In order to reduce LCD, drive the cost of chip, in the situation that GPU performance improves constantly, people drive chip at the LCD progressively releasing without GRAM.At LCD by without GRAM, drive in the display system that chip forms, GPU is frame rate by take the scanning frequency of LCD display, to LCD, drives chip to transmit view data.In this case, LCD drives chip not have the LCD of GRAM to drive chip by detecting the write control signal of GRAM, to differentiate the motion state that shows image like that by image-tape.The method that is original differentiation consecutive image motion state is no longer applicable, and must seek new detection method.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of in the LCD driving chip without GRAM, by calculating, shows that the judgement of image C RC code shows the detection method of image motion state.The method is not only convenient to circuit and is realized, and effectively.
For solving the problems of the technologies described above, the invention provides a kind of image motion condition detection method that drives chip for LCD, present image to be detected is divided into continuous a plurality of two field pictures, and described detection method comprises step:
S1: " the CRC code value of previous frame image " that current frame image is set be one default quantitatively;
S2: the data that read described current frame image;
S3: calculate described " the CRC code value of current frame image ";
S4: judgement described " the CRC code value of current frame image " whether equal described " the CRC code value of previous frame image " (in detection algorithm, need constantly relatively be the CRC code value of two consecutive frame images, and default be only quantitatively the initial value of " the CRC code value of previous frame image "); If both equate, enter following step S5; If both are unequal, enter following step S6;
S5: judge that described present image is as rest image;
S6: judge that described present image is as moving image;
S7: described " the CRC code value of previous frame image " is updated to described " the CRC code value of current frame image "; And
S8: judge whether image demonstration finishes; If described image shows, do not finish, after returning to step S501, execution step S502, circulates with this; If described image shows, finish, whole flow process finishes.
Alternatively, described CRC code is CRC-8 type code, CRC-10 type code, CRC-12 type code or CRC-16 type code.
Alternatively, the arbitrary value that the described default pattern that quantitatively can get current described CRC code allows.
Alternatively, described presetting is quantitatively 0.
Alternatively, described LCD drives in chip and does not have the random asccess memory (GRAM) for memory image.
Alternatively, to drive chip be for the LCD display system of mobile terminal for described LCD.
Alternatively, except described LCD drives chip, described LCD display system also comprises:
Graphic process unit, drives chip to be connected with described LCD, for data image signal being sent to described LCD drive chip, and and described LCD drive between chip and receive and dispatch display control signal;
LCD display, drives chip to be connected with described LCD, for receiving pixel drive voltage signal and line scanning control signal, realizes the correct demonstration of image.
Alternatively, described mobile terminal comprises mobile phone, panel computer, e-book and personal digital assistant.
Compared with prior art, the present invention has the following advantages:
The present invention makes LCD drive chip, and especially the LCD without GRAM drives chip to possess the ability that detects shown image motion state of living in, for LCD drives chip to realize low-power consumption characteristic, lays a good foundation with some image processing function.
Detection method of the present invention not only circuit realizes simply, and respond well, has good market application foreground.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage become more obvious by the description by below in conjunction with drawings and Examples, wherein:
Fig. 1 is the modular structure figure of a kind of LCD display system for mobile terminal of the prior art;
Fig. 2 be of the prior art a kind of with GRAM(the random asccess memory for memory image) LCD drive the internal module structure chart of chip;
Fig. 3 is the computational process schematic diagram that the image motion condition detection method for LCD driving chip of one embodiment of the invention represents every frame image data CRC code;
Fig. 4 is the computational process schematic diagram of the selected CRC code of the image motion condition detection method for LCD driving chip of one embodiment of the invention;
Fig. 5 is the operational flowchart of the image motion condition detection method for LCD driving chip of one embodiment of the invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth in the following description more details so that fully understand the present invention; but the present invention obviously can implement with the multiple alternate manner that is different from this description; those skilled in the art can do similar popularization, deduction according to practical situations without prejudice to intension of the present invention in the situation that, therefore should be with content constraints protection scope of the present invention of this specific embodiment.
Paper is ABC and the invention thinking of the present invention of CRC code once: CRC code (cyclic redundancy check (CRC) code) is a kind of check code with very strong error detecing capability, it at first in digital communication system for data check.At data sending terminal, first the CRC code of the data that send is calculated, and along with data are sent to receiving terminal together.Receiving terminal receives after transmission data, according to calculating CRC code with the identical mode of transmitting terminal.After all data receivers complete, compare the CRC code of transmitting terminal and receiving terminal.If the two difference, can conclude that data make a mistake in transmitting procedure.If the two is identical, can in transmitting procedure, not make a mistake with sizable probability decision data.According to same reason, at the LCD without GRAM, drive in chip, can to front and back two frame image datas, by identical mode, calculate crc value respectively.If the crc value of front and back two two field pictures is different, this two frame image data necessarily there are differences, and can assert that this two two field picture is moving image; If the crc value of front and back two two field pictures is identical, can judge that this two frame image data is identical with sizable probability, this two two field picture is rest image.
The operation that utilizes CRC code to carry out image motion condition discrimination can, in LCD drives chip, realize with circuit form.Fig. 3 has represented the computational process of every frame image data CRC code.Wherein, the object of view data serialization operation is in a certain order by the pixel sequence of entire image, and serialized data to be sent into CRC code calculation circuit one by one and do the calculation of CRC yardage, generation CRC code.For example, establishing image pixel is the capable c row of r, and single pixel is expressed as P
i,j(1≤i≤r, 1≤j≤c), we can sort to pixel according to mode line by line so, that is: P
1,1p
1,2p
1, cp
2,1p
2,2p
2, cp
r, 1p
r, 2p
r,c.The pixel coming above is first carried out the calculation of CRC yardage, carries out the calculation of CRC yardage after coming pixel below.In each pixel, the value of each color component also needs to be arranged in a certain order bit sequence.For example, if three color component value of a pixel (length is 8-bit) are respectively: R=143(10001111B), G=51(00110011B), B=160(10100000B), we can be converted to bit sequence 100011110011001110100000 by color component value according to the sequencing of R, G, B.Bit is above introduced into CRC code calculation circuit, enters CRC code calculation circuit after bit below.
CRC pattern can be chosen the CRC code (as CRC-8, CRC-10, CRC-12, CRC-16 etc.) of all lengths that has become international standard.For example, we can choose a kind of CRC-8 type code that code length is shorter, realization is easier, and its generator polynomial is: X
8+ X
2+ X+1.Correspondingly, CRC Calculative Process can be expressed as Fig. 4.In Fig. 4, ⊕ is that mould 2 adds operator.Before calculating starts, make K switch in off-state.When all Bit datas of image are sent into CRC code calculation circuit, and after having calculated, the K that closes a switch, the value of output bit register, R
7r
6r
5r
4r
3r
2r
1r
0(R
7～R
0be data significance bit, R
7for MSB(highest significant position), R
0for LSB(least significant bit)) be the CRC code (binary form) of entire image data.
CRC code calculated example: establishing image resolution ratio is 128 * 128, every pixel 24 bits, and every pixel rgb value is (255,255,255).According to above-mentioned selected data serialization method and CRC pattern, calculating this image C RC code is 00001111B(0FH).If this image the first row first row pixel is modified to (0,255,255), other pixel color value do not become, and CRC code becomes 00100100B(24H).
Fig. 5 is the operational flowchart of the image motion condition detection method for LCD driving chip of one embodiment of the invention.As shown in Figure 5, this detection method comprises:
Execution step S501, arranges " previous frame image C RC code value " variable CRC_last_frame=0;
Execution step S502, reads current frame image data;
Execution step S503, calculates " current frame image CRC code value " CRC_current_frame;
Execution step S504, judgement " current frame image CRC code value " CRC_current_frame whether equal to need in " previous frame image C RC code value " variable CRC_last_frame(detection algorithm constantly relatively be the CRC code value of two consecutive frame images, and default be only quantitatively the initial value of " the CRC code value of previous frame image "); If " current frame image CRC code value " CRC_current_frame equals " previous frame image C RC code value " variable CRC_last_frame, enter step S505; If " current frame image CRC code value " CRC_current_frame is not equal to " previous frame image C RC code value " variable CRC_last_frame, enter step S506;
Execution step S505, judges that present image is as rest image;
Execution step S506, judges that present image is as moving image;
Execution step S507, upgrades " previous frame image C RC code value " variable CRC_last_frame=" current frame image CRC code value " CRC_current_frame;
Execution step S508, judges whether image demonstration finishes; If image shows, do not finish, after flow process returns to step S501, wait for an opportunity to perform step S502; If image shows, finish, whole flow process finishes.
It may be noted that " previous frame image C RC code value " variable CRC_last_frame can be set to the arbitrary value that CRC pattern allows in execution step S501.For example, for CRC-8 type code, CRC_last_frame can be set to 0～255 arbitrary integer.For easy meter, CRC_last_frame=0 can be set.Under above-mentioned setting, the first two field picture generally can be judged as moving image.This does not hinder application of the present invention.
In sum, the detection method aim of image motion state of the present invention is after often reading in the image that a frame is new, using it as current frame image, and calculates its CRC code value.Then the CRC code value of the CRC code value of current frame image and previous frame image is compared.If the two is equal, can judge that this two frame image data is identical, current frame image is rest image; If the two is unequal, can judge that this two frame image data is variant, current frame image is moving image.Should particularly point out, exist in theory two width view data variant, but the equal situation of the two CRC code, this will cause moving image to be judged as the mistake of rest image.Because this mistake only affects the power saving effect of the LCD display of mobile terminal, and the probability occurring is very low, so it does not affect practical character of the present invention.
The present invention makes LCD drive chip, and especially the LCD without GRAM drives chip to possess the ability that detects shown image motion state of living in, for LCD drives chip to realize low-power consumption characteristic, lays a good foundation with some image processing function.
Detection method of the present invention not only circuit realizes simply, and respond well, has good market application foreground.
Although the present invention with preferred embodiment openly as above, it is not for limiting the present invention, and any those skilled in the art without departing from the spirit and scope of the present invention, can make possible change and modification.Therefore, every content that does not depart from technical solution of the present invention, any modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, within all falling into the protection range that the claims in the present invention define.
Claims (8)
1. for LCD, drive an image motion condition detection method for chip, present image to be detected is divided into continuous a plurality of two field pictures, and described detection method comprises step:
S1: " the CRC code value of previous frame image " that current frame image is set be one default quantitatively;
S2: the data that read described current frame image;
S3: calculate described " the CRC code value of current frame image ";
S4: whether judgement described " the CRC code value of current frame image " equals described " the CRC code value of previous frame image "; If both equate, enter following step S5; If both are unequal, enter following step S6;
S5: judge that described present image is as rest image;
S6: judge that described present image is as moving image;
S7: described " the CRC code value of previous frame image " is updated to described " the CRC code value of current frame image "; And
S8: judge whether image demonstration finishes; If described image shows, do not finish, after returning to step S501, execution step S502, circulates with this; If described image shows, finish, whole flow process finishes.
2. image motion condition detection method according to claim 1, is characterized in that, described CRC code is CRC-8 type code, CRC-10 type code, CRC-12 type code or CRC-16 type code.
3. image motion condition detection method according to claim 2, is characterized in that, the arbitrary value that the described default pattern that quantitatively can get current described CRC code allows.
4. image motion condition detection method according to claim 3, is characterized in that, described presetting is quantitatively 0.
5. image motion condition detection method according to claim 1, is characterized in that, described LCD drives in chip and do not have the random asccess memory (GRAM) for memory image.
6. image motion condition detection method according to claim 5, is characterized in that, it is for the LCD display system of mobile terminal that described LCD drives chip.
7. image motion condition detection method according to claim 6, is characterized in that, except described LCD drives chip, described LCD display system also comprises:
Graphic process unit, drives chip to be connected with described LCD, for data image signal being sent to described LCD drive chip, and and described LCD drive between chip and receive and dispatch display control signal;
LCD display, drives chip to be connected with described LCD, for receiving pixel drive voltage signal and line scanning control signal, realizes the correct demonstration of image.
8. image motion condition detection method according to claim 7, is characterized in that, described mobile terminal comprises mobile phone, panel computer, e-book and personal digital assistant.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667690A (en) * | 2004-03-10 | 2005-09-14 | 恩益禧电子股份有限公司 | Display device, display-device driver circuit, and method of driving display device |
| WO2006131700A1 (en) * | 2005-06-08 | 2006-12-14 | British Telecommunications Public Limited Company | Video coding |
| CN101038721A (en) * | 2006-03-16 | 2007-09-19 | 乐金电子（南京）等离子有限公司 | Image processing arrangement and method for plasma display screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667690A (en) * | 2004-03-10 | 2005-09-14 | 恩益禧电子股份有限公司 | Display device, display-device driver circuit, and method of driving display device |
| WO2006131700A1 (en) * | 2005-06-08 | 2006-12-14 | British Telecommunications Public Limited Company | Video coding |
| CN101038721A (en) * | 2006-03-16 | 2007-09-19 | 乐金电子（南京）等离子有限公司 | Image processing arrangement and method for plasma display screen |
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Application publication date: 20140326 |