CN102237067A - Display device driving circuit and display device - Google Patents
Display device driving circuit and display device Download PDFInfo
- Publication number
- CN102237067A CN102237067A CN2010101650634A CN201010165063A CN102237067A CN 102237067 A CN102237067 A CN 102237067A CN 2010101650634 A CN2010101650634 A CN 2010101650634A CN 201010165063 A CN201010165063 A CN 201010165063A CN 102237067 A CN102237067 A CN 102237067A
- Authority
- CN
- China
- Prior art keywords
- circuit
- video data
- mentioned
- compressibility
- display device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a display device driving circuit and a display device. The display device driving circuit (101) comprises a display data compression circuit (109), a recording circuit (110), a display data expansion circuit (111) and output circuits (112 and 113). A compression ratio setting circuit (107) is arranged in the display device driving circuit; the display data compression circuit has a function of compressing display data according to a compression ratio set in the compression ratio setting circuit; therefore, on the premise that a display image is low in image quality degradation even the compression ratio is increased, the compression ratio is increased so as to reduce the power consumption; furthermore, on the premise that the display image is high in image quality degradation when the compression ratio is increased, the compression ratio is reduced to guarantee that the image quality is high after the data is expanded.
Description
Technical field
The present invention relates to the compression treatment technology of video data, relate in particular to the technology that can effectively be applicable to display device drive circuit and display device.
Background technology
In recent years, in mobile devices such as mobile phone, the height of display panel becomes more meticulous developed, and VGA and then HD image quality show on the resolution of display panel is becoming main flow.When plate hight becomes more meticulous face to face, the power consumption that display data transmissions produces will increase.For this reason, adopted built-in frame memory in driver, transmitting and displaying data when image change are only cut down the mode of power consumption thus.But because height becomes more meticulous, frame memory increases, and becomes problem owing to read the power consumption increase that produces from frame memory.
About the increase of above-mentioned frame memory, for example shown in patent documentation 1 and the patent documentation 2 like that, proposed in drive circuit for display, to cut down data volume by the compression video data, reduce the technology of frame memory size thus.Can will be suppressed to less from the power consumption that reading of frame memory produces by the data volume of cutting down frame memory.
[patent documentation 1]: TOHKEMY 2007-108439 communique
[patent documentation 2]: TOHKEMY 2006-338028 communique
Summary of the invention
The present inventor studies above-mentioned prior art, has found following variety of issue.
(1) video data is compressed to the size of the frame memory of preparing in the driving circuit and stores, and carries out the data expansion and show on display device when showing.Shown in above-mentioned prior art like that, in general, (make the size decreases of the frame memory after the compression) when compressibility is big, deterioration will take place in the image quality of the display image after the data expansion.The relation of image quality of the display image after compressibility and the expansion is according to display image and different.In general, even consecutive image or change level and smooth compressibilitys such as natural image and increase, the image quality deterioration is also less.Have such user interface image in more thin edge etc. and compare with consecutive image etc., even identical compressibility, it is big that the image quality deterioration also becomes.Therefore, when with identical compressibility all images being compressed, in having the user interface image at more thin edge, it is big that the image quality deterioration becomes.In addition, when showing consecutive image or changing level and smooth natural image etc., can not increase the rate of subduing of power consumption.
(2) display frame of mobile phone etc. is divided into tiny zone and shows, have the zone that shows electric wave situation and icon constantly etc. all the time and, show the zone of natural image, dynamic image etc.As described above,, when therefore compressing video data, in user interface image, will produce the image quality deterioration, and power consumption can not reduce a lot in natural image with identical compressibility because its characteristic of user interface image and natural image is different.
(3) along with height becomes more meticulous, the power consumption that relates to the display data transmissions between CPU and display device drive circuit becomes big problem.And in recent years, owing to high performance touch-screen etc. occurs, also become big from display frame to the request of the data of CPU transmission touch information etc., the transmitted data amount of the bus between CPU and display device drive circuit increases.
When video data being compressed, will produce the image quality deterioration in the user interface image (4) because its characteristic of user interface image and natural image that shows is different, so with identical compression algorithm in mobile phone etc.
(5) CPU of mobile phone etc. has a large amount of processing, therefore is difficult to judge compressibility and set by each display image.
The object of the present invention is to provide a kind of technology, even under the situation that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
Other purposes of the present invention are to provide a kind of video data compression-expansion technique, showing in the display device and display device drive circuit of different types of image by each zone, even under the situation of the viewing area that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the viewing area of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
Other purposes of the present invention are to provide a kind of technology, subdue the power consumption that bus consumed between CPU and display device drive circuit, reduce the required ratio of display data transmissions of this bus, even under the situation that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
Other purposes of the present invention are to provide a kind of video data compression-expansion technique, showing in the display device and display device drive circuit of different types of image by each zone, by using different algorithms to carry out the compression of video data, can guarantee the sufficient image quality after data are expanded by each zone.
Other purposes of the present invention are to provide a kind of technology, in display device and display device drive circuit, the image quality deterioration becomes big display image when increasing the also little display image of compressibility image quality deterioration and increasing compressibility even automatically differentiate, can be by each display image change compressibility.
Above-mentioned purpose and new feature record and the accompanying drawing by this instructions with other of the present invention will be able to clearly.
Be simply described as follows representative invention among the disclosed invention of the application.
For achieving the above object, the compressibility initialization circuit of the compressibility that can set video data is set in display device drive circuit, is provided with the function of video data being compressed according to the compressibility of compressibility initialization circuit setting in the video data compressor circuit.
For achieving the above object, the viewing area is divided into a plurality of, viewing area initialization circuit that the position of viewing area is set is set and by the compressibility initialization circuit of each viewing area, making can be by each viewing area setting compressibility.
For achieving the above object, the compress mode initialization circuit that can set the compress mode corresponding with the viewing area is set,, switches compress mode and carry out the compression of above-mentioned video data according to the setting value of above-mentioned compress mode initialization circuit and the display position of video data.
For achieving the above object, have following circuit in the above-mentioned display device drive circuit, this circuit can have the step that quantizes with quantization parameter at least in compression step, upgrade the setting value of above-mentioned compressibility initialization circuit according to the size of above-mentioned quantization parameter.
For achieving the above object, the compressibility initialization circuit of the compressibility that can set above-mentioned video data is set in CPU, the function of compressing video data according to the compressibility of setting in the compressibility initialization circuit is set in the video data compressor circuit, and the video data that has carried out compression in above-mentioned video data compressor circuit is transferred to the video data expanded circuit by writing circuit.
Be simply described as follows the resulting effect of representative solution in the disclosed invention of the application.
Promptly, a kind of technology can be provided, even under the situation that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
A kind of video data compression-expansion technique can be provided, when showing different types of image by each zone, even under the situation of the viewing area that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the viewing area of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
A kind of technology can be provided, subdue the power consumption that bus consumes, reduce the required ratio of display data transmissions of this bus, even under the situation that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
A kind of video data compression-expansion technique can be provided, showing in the display device and display device drive circuit of different types of image by each zone, by using different algorithms to carry out the compression of video data, can guarantee the sufficient image quality after data are expanded by each zone.
A kind of technology can be provided, and in display device and display device drive circuit, the image quality deterioration becomes big display image when increasing the also little display image of compressibility image quality deterioration and increasing compressibility even automatically differentiate, can be by each display image change compressibility.
Description of drawings
Fig. 1 is the figure of frame structure of the display device of expression embodiment of the present invention 1.
Fig. 2 is the figure of the frame structure of the general video data compressor circuit of expression.
Fig. 3 is the figure of frame structure of the video data compressor circuit of expression embodiment of the present invention 1.
Fig. 4 is the figure of frame structure of the video data expanded circuit of expression embodiment of the present invention 1.
Fig. 5 is that the figure of pattern is cut apart in the viewing area in the display device of expression embodiment of the present invention 2.
Fig. 6 is the figure of frame structure of the display device of expression embodiment of the present invention 2.
Fig. 7 is the figure of frame structure of the video data compressor circuit of expression embodiment of the present invention 2.
Fig. 8 is the figure of frame structure of the video data expanded circuit of expression embodiment of the present invention 2.
Fig. 9 is the figure of frame structure of the display device of expression embodiment of the present invention 3.
Figure 10 is the figure of frame structure of the display device of expression embodiment of the present invention 4.
Figure 11 is the figure of the detailed frame structure of the BTC compress mode circuit of expression embodiment of the present invention 4.
Figure 12 is the figure of notion of BTC compression algorithm of the BTC compress mode circuit of expression embodiment of the present invention 4.
Figure 13 is the figure of frame structure of the video data compressor circuit of expression embodiment of the present invention 4.
Figure 14 is the figure of frame structure of the video data expanded circuit of expression embodiment of the present invention 4.
Label declaration
100: display device; 101: display device drive circuit; 102:CPU;
103: storer; 104: internal bus; 105: display panel;
106: input/output interface circuit; 107: the compressibility set-up register;
108: input buffer; 109: the video data compressor circuit;
110: frame memory; 111: the video data expanded circuit;
112: output buffer; The 113:DA converter;
201: the color space transformation circuit; 202: orthogonal intersection inverter;
203: sample circuit; 204: entropy coding circuit;
205: storer writes control circuit;
301: the long predictor circuit of coding; 302: the long decision-making circuit of target code;
303: the quantization parameter decision-making circuit;
401: storer is read control circuit; 402: contrary entropy coding circuit;
403: inverse quantization circuit; 404: inverse orthogonal transform circuit;
405: contrary color space transformation circuit;
501: the display image of display device; 502: the user interface image viewing area;
503: the natural image viewing area; 504: the user interface image viewing area;
601: first area compressibility set-up register;
602: second area compressibility set-up register;
603: the viewing area set-up register;
604: first area upper left X setting coordinate register;
605: first area upper left Y setting coordinate register;
606: bottom right, first area X setting coordinate register;
607: bottom right, first area Y setting coordinate register;
608: the timing generative circuit;
The 701:X coordinate counter; The 702:Y coordinate counter;
703: the region decision circuit; 704: selector switch;
The 801:X coordinate counter; The 802:Y coordinate counter;
803: the region decision circuit; 804: selector switch;
901: the video data compressor circuit; 902: the compressibility set-up register;
1001: compact model switches register;
1002: send the solicited status register once more;
1101: the blocking circuit; 1102: typical value is extracted circuit;
1103: the pixel distributor circuit;
1201: the pixel value of the R before the compression; 1202,1203: typical value;
1204: the pixel value that is compressed into 1 R;
1205: the pixel value of the R after the expansion;
1301:BTC mode compressor circuit;
1302: the orthogonal transformation compressor circuit; The 1303:AND circuit;
1304: selector switch; 1305: quantization parameter mean value calculation circuit;
1401:BTC mode expanded circuit; 1402: the orthogonal transformation expanded circuit;
The 1403:AND circuit; 1404: selector switch.
Embodiment
1. representational embodiment
The summary of the representational embodiment of invention disclosed among the application at first, is described.In the summary description of representational embodiment, the special case that only comprised in the notion of the inscape of its representative of illustration of the reference marks of the accompanying drawing of bracket and reference in addition.
(1) display device drive circuit (101) that relates to of representational embodiment of the present invention comprising: video data compressor circuit (109), can compress the data volume of subduing above-mentioned video data by the video data to image; Writing circuit (110) can be stored the video data that has been carried out compression by above-mentioned video data compressor circuit; Video data expanded circuit (111) is expanded the video data of reading from above-mentioned writing circuit; And output circuit (112,113), can will carry out the video data of expansion in above-mentioned video data expanded circuit exports to display part, above-mentioned display device drive circuit also comprises the compressibility initialization circuit (107) of the compressibility that can set above-mentioned video data, and above-mentioned video data compressor circuit has the function of above-mentioned video data being compressed according to the compressibility of being set by above-mentioned compressibility initialization circuit.
According to said structure, even under the situation that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and the image quality deterioration becomes under the situation of big display image when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
(2) in above-mentioned (1), above-mentioned display device drive circuit also comprises the viewing area initialization circuit (107) that can set a plurality of viewing areas, above-mentioned compressibility initialization circuit has the function that can set the compressibility corresponding with above-mentioned viewing area, above-mentioned video data compressor circuit has according to the setting value of above-mentioned viewing area initialization circuit and the display position of video data, switches compressibility and the function of carrying out the compression of above-mentioned video data.Thus, showing in the display device and display device drive circuit of different types of image by each zone, even under the situation of the viewing area that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the viewing area of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
(3) in above-mentioned (2), above-mentioned display device drive circuit also comprises the compress mode initialization circuit (1001) that can set the compress mode corresponding with above-mentioned viewing area, above-mentioned video data compressor circuit is according to the setting value of above-mentioned compress mode initialization circuit and the display position of video data, switches compress mode and carries out the compression of above-mentioned video data.Thus, subdue the power consumption that bus consumes, reduce the required ratio of display data transmissions of this bus, even under the situation that increases the also little display image of compressibility image quality deterioration, can improve compressibility and subdue power consumption, and under the situation of the display image that the change of image quality deterioration is big when increasing compressibility, can reduce compressibility, guarantee the sufficient image quality after data are expanded.
(4) in above-mentioned (1), above-mentioned display device drive circuit also comprises following circuit (1305): this circuit has the step that quantizes with quantization parameter at least in compression step, upgrades the setting value of above-mentioned compressibility initialization circuit according to the size of above-mentioned quantization parameter.Thus, in the display device and display device drive circuit of pressing the different types of image of each zone demonstration, use different algorithms and carry out the compression of video data, can guarantee the sufficient image quality after data are expanded thus by each zone.
(5) display device (100), comprise display device drive circuit (101) and display part (105), wherein, this display device drive circuit (101) comprising: the CPU (102) that possesses the video data compressor circuit (901) of the data volume that can compress the video data of image and subdue above-mentioned video data, can store the writing circuit (110) of the video data that has carried out compression, the video data expanded circuit (111) that the video data of reading from above-mentioned writing circuit is expanded, and the output circuit (112 that can export the video data that in above-mentioned video data expanded circuit, has carried out expansion, 113); Above-mentioned CPU (102) comprises the compressibility initialization circuit (902) of the compressibility that can set above-mentioned video data, above-mentioned video data compressor circuit has the function of above-mentioned video data being compressed according to the compressibility of being set by above-mentioned compressibility initialization circuit, and the video data that has carried out compression in above-mentioned data compression circuit is transferred to above-mentioned video data expanded circuit by above-mentioned writing circuit.
According to said structure, in display device and display device drive circuit, the image quality deterioration becomes big display image when increasing the also little display image of compressibility image quality deterioration and increasing compressibility even automatically differentiate, can be by each display image change compressibility.
2. the explanation of embodiment
Then, be described in further detail embodiment.
At the whole accompanying drawings that are used for illustrating embodiment,, and omit its explanation repeatedly in principle with part mark prosign.
In general, when the view data of compression rest image, there are two as representational compression method.At first, first method is to use the method for orthogonal transformation and entropy coding, compresses according to block scheme shown in Figure 2.Another kind method is to be called as BTC (Blocktruncation coding: method block truncation coding).Each method of following simple declaration.
At first, the use orthogonal transformation method shown in Figure 2 and the method for entropy coding are described.In Fig. 2, the 201st, carry out the piece of color space transformation.In general, the display device drive circuit of liquid crystal driver etc. is accepted display image with rgb format from CPU.Therefore the RGB form and aspect are to repeat more form in color space, repeat less color space between general operation parameter when compression is handled.For example propose to have the color space of various compression usefulness such as YUV, YCbCr, YCoCg.Therefore the kind of the color space that compresses does not influence the application, uses that color space can arbitrarily.In color space transformation circuit 201, the RGB data conversion become the compression color space data.
The 202nd, orthogonal intersection inverter.Display image is divided into the piece of 4 pixels * 4 pixels, 8 pixels * 8 pixels, 16 pixels * 16 pixels etc. in orthogonal intersection inverter, carries out computing with orthogonal transform matrix, the color data that will spatially dispose is divided into low-frequency component and radio-frequency component thus.Radio-frequency component generally becomes less value, utilizes this situation to carry out data compression.As orthogonal transformation, the Wavelet of the DCT that Hadamard transform (Hadamard transform) is arranged, in MPEG, JPEG etc., use, use in JPEG2000 etc. etc.In addition, the size of the orthogonal matrix of orthogonal transformation also is various matrixes such as 4 * 4,8 * 8,16 * 16.The kind of these orthogonal transformations can be used kind arbitrarily to not influence of the present invention.
The 203rd, sample circuit.The value that will obtain by orthogonal transformation is divided by constant, thereby the value of making diminishes.This constant is called quantization parameter.
The 204th, entropy coding circuit.Entropy coding is the coded system that is distributed into the different coding of code length according to the probability of occurrence of numerical value.In general, the probability that radio-frequency component is obtained 0,1 equivalent less value is very big, therefore carries out entropy coding, by with probability of occurrence the highest 0 be assigned as 1 coding, therefore can cut down data volume and compress.As entropy coding, Huffman (Huffman) coding, Exp-Golomb coding etc. are arranged.The kind of these entropy codings does not influence the present invention, thereby can use any coding.
The 205th, storer writes controll block.In this piece,, carry out data compression thus by with record in the coded set of variable-length and in storer.
Then, with reference to Figure 11, Figure 12 BTC is described.In BTC, with 4 * 4,8 * 8 equidimensions display image is carried out blocking, and compress.At first as shown in Figure 11, in blocking circuit 1101, display image is carried out blocking.For example can consider to be divided into the piece of 4 pixels * 4 pixels.For example in certain piece, the R value of getting in the rgb signal is 1201 such values.Extract in the circuit 1102 in typical value, extract typical value.The extracting method of typical value proposes to have various extracting method.Following method is for example arranged: as threshold value, the mean value of the mean value of value that will be bigger than threshold value and the value littler than threshold value extracts as typical value with the mean value of piece integral body.Like this, extract typical value 1202 and typical value 1203.For example, the typical value with this moment is taken as 16 and 227.In pixel distributor circuit 1103, the mean value of integral body as threshold value, shown in 1204, is assigned as 0 or 1 with the value of the R of each pixel.Data for G, B are carried out conversion similarly.For example each pixel value of R with 8 situations about showing under, by carrying out such conversion, two typical values are 8 * 2=16 position, each pixel is distributed into 16, therefore can show 32 after the compression.Be 8 * 16=128 position before the compression, therefore can be compressed to 1/4.During expansion, shown in 1205,0 or 1 value of each pixel is replaced with typical value.Thus, compress with BTC.By increasing the number of typical value, the image quality after the expansion is improved, and compressibility reduces.
The compression algorithm of general rest image has such two kinds.In general, the compression method of combination orthogonal transformation and entropy coding is suitable for that the display image inward flange is less, the image of display image smooth change.In addition, BTC is suitable for the less image of number of colors (color category).
[embodiment 1]
Then, describe embodiment 1 in detail.Fig. 1 is the block scheme of the display device of embodiments of the present invention 1.The 100th, the display device of mobile phone etc., the 101st, the display device drive circuit of liquid crystal driver etc., the 102nd, the CPU (central processing unit) of display device integral body such as control mobile phone, the 103rd, the storer of storage video data etc., the 104th, internal bus, the 105th, the display panel that shows by display device drive circuit 101 drivings.Display panel can be any panel so long as display panels such as liquid crystal panel, organic EL (Electro-Luminescence) panel, PDP (PlasmaDisplay Panel), FED (Field Emission Display) panel, electronic paper get final product.
106 comprise the unshowned registers group that is used for being undertaken by CPU102 the setting of various patterns, and are the input/output interface circuits from CPU102 or storer 103 reception video datas.The 107th, a register in the registers group that has in this input/output interface circuit is the compressibility set-up register of the compressibility of the video data that uses in the video data compressor circuit that illustrates after being set in.The 108th, input buffer.In general, from the transmission of the video data of CPU is that a behavior unit with horizontal direction transmits, piece with 4 * 4,8 * 8,16 * 16 etc. in orthogonal transformation is that unit transmits, and therefore need hold the input buffers of 4 * 2 row, 8 * 2 row or 16 * 2 row in advance.The 109th, the video data compressor circuit.In this block scheme, the data after the compression video data also will compress write in the frame memory 110.
The 111st, the video data expanded circuit, to the carrying out of from frame memory, reading the video data of compression expand, and transfer to output buffer 112.Usually the expansion of data be with the unit of orthogonal transformation promptly the piece of 4 pixels * 4 pixels, 8 pixels * 8 pixels, 16 pixels * 16 pixels etc. be that unit carries out, therefore wait accumulates the data of delegation and exports to DA (digital simulation) converter 113 in output buffer 112, and to display panel 105 outputs.At this, under the situation of the control device drive unit of the panel of controlling with aanalogvoltage for liquid crystal panel etc., be DA converter 113, but also can consider the display panel of current drives, pulsed drive etc.DA converter 113 changes according to the type of drive of display panel 105, to convert the piece of circuit function of the mode that can drive display panel to just passable so long as have digital value with display pixel, the circuit block of DA converter 113 changes to the circuit block with other functions, to the present invention also not influence.
Then, describe circuit structure in the video data compressor circuit 109 in detail with reference to Fig. 3.The video data compressor circuit 109 of Fig. 3 is to use the compression method of orthogonal transformation and entropy coding, and it is identical with circuit shown in Figure 2 that color space transformation circuit 201, orthogonal intersection inverter 202, sample circuit 203, entropy coding circuit 204, storer write control circuit 205.Video data compressor circuit 109 is compared with compressor circuit shown in Figure 2, has the long fallout predictor 301 of coding, the long decision-making circuit 302 of target code, quantization parameter decision-making circuit 303.The long decision-making circuit 302 of target code is the preceding data volumes of compression that multiply by an amount with (setting value of 1-compressibility set-up register 107), calculates the long circuit of coding of an amount that becomes target.The long fallout predictor 301 of encoding is circuit that the coding of an amount behind the entropy coding when calculating with the data of predetermined a plurality of quantization parameters after divided by orthogonal transformation, corresponding with separately quantization parameter is grown.Quantization parameter decision-making circuit 303 is according to the output of the long fallout predictor 301 of coding, the output that selection does not exceed the long decision-making circuit 302 of target code is among the long coding length of target code, long with minimum quantization parameter corresponding codes, and exports the circuit of its quantization parameter.The quantization parameter that is used in decision in the quantization parameter decision-making circuit 303 carries out division arithmetic in sample circuit 203, and quantizes.Quantization parameter is generally in entropy coding is stored in storer.
By constituting compressor circuit like this, can carry out the compression of video data with the compressibility of in the compressibility set-up register, setting.
Then, describe circuit structure in the video data expanded circuit 111 in detail with reference to Fig. 4.Read control part 401 at storer, multiply by data volume before the compression of an amount with (setting value of 1-compressibility set-up register 107), to calculate the coding of an amount long, reads the data of growing for the coding that the video data decoding of an amount is calculated.Then, entropy coding is transformed into the numeric data of fixed length in contrary entropy coding circuit 402, in inverse quantization circuit 403, the numeric data of exporting with contrary entropy coding circuit 402 multiply by quantization parameter and carries out re-quantization.In inverse orthogonal transform circuit 404, multiply by the inverse matrix of orthogonal matrix, in contrary color space transformation circuit 405, become the RGB color space with colour space transformation from data compression.By being made as this structure, can expand the video data that has carried out compression with the compressibility of in the compressibility set-up register, setting.
By being made as this structure, can be in present embodiment 1 with the corresponding compressibility write store of setting with CPU of compressibility.For example, CPU shows on display panel 105 when the image taken with digital camera etc. has the image of smoothness properties, by setting the value of compressibility set-up register 107 bigger, can increase compressibility, reduction writes the data volume of frame memory, thereby reduces power consumption.In addition, under the situation of dynamic images such as display video image, for dynamic image, the image quality deterioration is so not eye-catching, therefore sets the value of compressibility set-up register 107 bigger, thereby can increase compressibility, reduction writes the data volume of frame memory, reduces power consumption.
On the contrary, on display panel 105, show when UI image etc. has the image at a lot of trickle edges, set the value of compressibility set-up register 107 less, and increase the data volume that writes frame memory.Can prevent the image quality deterioration thus, make image quality after the expansion remain on certain more than.
This compressibility set-up register might not be set numerical value.For example also compressibility can be defined as a plurality of fixed values, for example one of them be made as the UI pattern, another is set at dynamic image, natural image pattern.
[embodiment 2]
Then, with reference to Fig. 5, Fig. 6, Fig. 7, Fig. 8 embodiment 2 is described.
Different being that present embodiment 2 and embodiment 1 are bigger is divided into a plurality of zones with the viewing area, can be by each zone change compressibility.
In general, the display frame 501 of mobile phone etc. be divided into as shown in Figure 5 natural image standby picture 503 and, constantly, UI (user interface) image display area 502,504 of arranging such as various icons.
Fig. 6 is the block diagram of the display device of embodiment 2.The display device 100 of embodiment 2 has viewing area set-up register 603, and having first area compressibility set-up register 601 and the second area compressibility set-up register 602 that in compressibility set-up register 107, can set compressibility by each zone, these block diagrams with the display device 100 of embodiment 1 are different.Viewing area set-up register 603 comprises first area upper left X setting coordinate register 604, first area upper left Y setting coordinate register 605, bottom right, first area X setting coordinate register 606 and bottom right, first area Y setting coordinate register 607, can set first area and other viewing areas (second area).
Fig. 7 is the detailed diagram of the data compression circuit of embodiment 2.701, the 702nd, counter, it represents X coordinate, the Y coordinate of the display position of the current video data that is compressing respectively.Counter 701,702 is by being reset by the frame start signal that generates in the timing generative circuit 608, and when the compression processing of a piece finished, counter 701 was only counted the size of the directions X of piece.When the processing of delegation finished, counter 702 was only counted the size of Y direction.The 703rd, comparer, count value 701 first area upper left X setting coordinate register more than 604, bottom right, first area X setting coordinate register below 606 and 702 count value at first area upper left Y setting coordinate register more than 605 and under the situation of bottom right, first area Y setting coordinate register below 607, the output expression is the first area signal of first area, output second area signal under situation in addition.Selector switch 704 is output as under the situation of first area signal at comparer 703, value to the long decision-making circuit 302 output first area compressibility set-up registers 601 of target code, be output as at comparer 703 under the situation of second area signal, to the value of the long decision-making circuit 302 output second area compressibility set-up registers 602 of target code.
Fig. 8 is the detailed diagram of the data expanded circuit of embodiment 3.801, the 802nd, counter, the 803rd, comparer, 801 count value first area upper left X setting coordinate register more than 604, bottom right, first area X setting coordinate register below 606 and 802 count value at first area upper left Y setting coordinate register more than 605 and under the situation of bottom right, first area Y setting coordinate register below 607, the output expression is the first area signal of first area, output second area signal under situation in addition.Selector switch 804 is output as under the situation of first area signal at comparer 803, read the value of control circuit 401 output first area compressibility set-up registers 601 to storer, be output as at comparer 803 under the situation of second area signal, read the value of control circuit 401 output second area compressibility set-up registers 602 to storer.Thus,, also can read the data volume corresponding, carry out correct expansion with compressibility even compressibility changes in the way of frame.
In Fig. 5, if zone 503 is the first area, the top-left coordinates of setting regions 503 and bottom right coordinate in viewing area set-up register 603, in first area compressibility set-up register 601 since be natural image therefore setting than higher compressibility, in second area compressibility set-up register 602 owing to be the therefore lower compressibility of setting of UI image, image quality after the expansion more than can in all zones, keeping necessarily thus, and can improve compressibility about regional 503 parts, therefore can suppress power consumption lower.
[embodiment 3]
Then, with reference to Fig. 9 embodiment 3 is described.
Different being that present embodiment 3 and embodiment 1 and embodiment 2 are bigger, video data compressor circuit 901 is arranged in the CPU102.
Video data compressor circuit 901 is the identical circuit of video data compressor circuit 107 functions with embodiment 1.According to the setting value of the compressibility set-up register 902 in the CPU102, carry out the compression of display image, and transmit to display device drive circuit 101 via internal bus 104.Video data can directly transmit to display device drive circuit 101 from CPU102.Also can will carry out once transmitting to display device drive circuit 101 from storer 103 again after the data storage of compression from CPU102 to storer 103 transmission.CPU102 will be set in the value in the compressibility set-up register 902 when compression, be set in when showing in the compressibility set-up register 107 in the display device drive circuit 101.Possess compressor circuit in CPU one side like this, and carry out the transmission of packed data, can significantly subdue the switching times of internal bus thus, reduce power consumption.In addition, owing to can shorten the service time of bus, thereby have the such advantage of data transmission that can be distributed to other functions such as touch-screen excess time.
[embodiment 4]
Then, with reference to Figure 10, Figure 13 and Figure 14 embodiment 4 is described.
Different being that present embodiment 4 and embodiment 1, embodiment 2 and embodiment 3 are bigger can be switched the compress mode this point and can automatically switch the compressibility this point of image according to the impairment grade of the image after the video data expansion according to display image.
In Figure 10, the 1001st, the compact model in zone 2 shown in Figure 5 (zone 502 and zone 504) switches register.In more image such as such UI image such as regional 2 grades, inferior in the situation that number of colors is less, good than under combination orthogonal transformation and the entropy coding mode of the image quality after the expansion under the BTC mode sometimes.According to the design of display image, CPU102 switches setting BTC pattern in the register 1001 at compact model, can select the compression method of BTC mode as zone 2 thus.
Figure 13, Figure 14 are the video data compressor circuit 109 of expression present embodiment 4, the detailed diagram of video data expanded circuit 111.
Among Figure 13, the 1301st, BTC mode compressor circuit, and have the function of circuit block shown in Figure 11.Orthogonal transformation compressor circuit 1302 is the circuit that compress with the combination of orthogonal transformation and entropy coding, except video data compressor circuit 109 and automatic compressibility function this point with embodiment 2, all is identical circuit.
In Figure 13, region decision circuit 703 output second area signals, when in compact model switching register 1001, being set at the BTC pattern, AND circuit 1303 output BTC patterns.When not setting the BTC pattern when region decision circuit 703 is exported the second area signals or in compact model switching register 1001, AND circuit 1303 becomes non-BTC pattern.Selector switch 1304 is exported the output of BTC mode compressor circuit 1301 when AND circuit 1303 is the BTC pattern.Output at AND circuit 1303 output orthogonal conversion compressor circuit 1302 when being non-BTC pattern.By carrying out work like this, can compress second area in the BTC mode.
The 1305th, quantization parameter mean value calculation circuit.In general, when the data compression mode of using based on the combination of orthogonal transformation and entropy coding, quantization parameter is big more, and the error of the data after initial data and the expansion is big more, produces the deterioration of image quality more.Can think that the mean value of the quantization parameter of calculating in quantization parameter mean value calculation circuit 1305 is big more, the image quality after the video data expansion is given birth to deterioration all the more.Therefore, when the mean value of the quantization parameter of calculating in quantization parameter mean value calculation circuit 1305 is bigger than certain value, deduct certain value the setting value of compressibility set-up register 601, and send request once more to sending solicited status register 1002 output video datas once more from regional 1.Like this, the video data that can will transmit once more reduces certain compressibility and compresses again, thereby can automatically keep certain image quality.
On the contrary, the mean value of the quantization parameter of calculating in quantization parameter mean value calculation circuit 1305 can be considered than certain value hour, even further compression also can keep certain above image quality.Therefore, the mean value of the quantization parameter of calculating in quantization parameter mean value calculation circuit 1305 is than certain value hour, add certain value on the setting value of compressibility set-up register 601, send request once more to sending solicited status register 1002 output video datas once more regional 1.Like this, energy will transmit the video data certain compressibility of raising of coming once more and compress again, reads needed power consumption thereby can subdue from frame memory.
In Figure 14, the 1401st, BTC mode expanded circuit, and have the function that generates growth data 1205 according to the typical value shown in Figure 12 1202,1203, pixel value 1204.Orthogonal transformation expanded circuit 1402 is the circuit that compress with the combination of orthogonal transformation and entropy coding, and is identical with the video data expanded circuit 111 of embodiment 2.
In general, under the situation that rest image shows, read-around number more than writing indegree, even therefore send for several times from CPU, does not have significant impact to power consumption overwhelmingly again yet.Like this, can automatically keep certain image quality, thereby power consumption can be controlled to minimum.
Under the situation of dynamic image, not to send once more by CPU, but can be by sending the video data of next frame, the compressibility that will change with the mean value of the quantization parameter of calculating in the quantization parameter mean value calculation circuit 1305 of former frame is used as the compressibility of next frame.In dynamic image, being correlated with of interframe is bigger, therefore by controlling compressibility like this, can automatically keep certain image quality, thereby power consumption can be controlled to minimum.
Below understand the invention of making by the inventor specifically, but the present invention is not limited thereto, and need not superfluous words, in the scope that does not break away from its main idea various changes can be arranged.
The present invention for example can be applicable to display device and display device drive circuits such as the LCD, OLED display of mobile phone, mobile game machine etc.
Claims (5)
1. display device drive circuit comprises:
The video data compressor circuit can compress the data volume of subduing above-mentioned video data by the video data to image;
Writing circuit can be stored the video data that has been carried out compression by above-mentioned video data compressor circuit;
The video data expanded circuit is expanded the video data of reading from above-mentioned writing circuit; And
Output circuit can carry out the video data of expanding by above-mentioned video data expanded circuit to display part output,
Above-mentioned display device drive circuit is characterised in that,
Above-mentioned display device drive circuit also comprises: can set the compressibility initialization circuit of the compressibility of above-mentioned video data, above-mentioned video data compressor circuit has: the function of compressing above-mentioned video data according to the compressibility of being set by above-mentioned compressibility initialization circuit.
2. display device drive circuit according to claim 1 is characterized in that,
Above-mentioned display device drive circuit also comprises: can set the viewing area initialization circuit of a plurality of viewing areas,
Above-mentioned compressibility initialization circuit has: can set the function of the compressibility corresponding with above-mentioned viewing area,
Above-mentioned video data compressor circuit has following function: according to the setting value of above-mentioned viewing area initialization circuit and the display position of video data, switch compressibility and carry out the compression of above-mentioned video data.
3. display device drive circuit according to claim 2 is characterized in that,
Above-mentioned display device drive circuit also comprises: can set the compress mode initialization circuit of the compress mode corresponding with above-mentioned viewing area,
Above-mentioned video data compressor circuit switches compress mode and carries out the compression of above-mentioned video data according to the setting value of above-mentioned compress mode initialization circuit and the display position of video data.
4. display device drive circuit according to claim 1 is characterized in that,
Above-mentioned display device drive circuit also comprises: have the step that quantizes with quantization parameter at least in compression step, and can upgrade the circuit of the setting value of above-mentioned compressibility initialization circuit according to the size of above-mentioned quantization parameter.
5. a display device comprises display device drive circuit and display part, wherein,
Above-mentioned display device drive circuit comprises: possess and can subdue the CPU of video data compressor circuit of the data volume of above-mentioned video data by the video data of compressed image; Can store the writing circuit of the video data that has carried out compression; The video data expanded circuit that the video data of reading from above-mentioned writing circuit is expanded; And can export the output circuit that has carried out the video data of expansion by above-mentioned video data expanded circuit,
Above-mentioned display part can show the video data that is output by above-mentioned output circuit,
Above-mentioned display device is characterised in that,
Above-mentioned CPU comprises: can set the compressibility initialization circuit of the compressibility of above-mentioned video data,
Above-mentioned video data compressor circuit has: according to the function of compressing above-mentioned video data by the compressibility of above-mentioned compressibility initialization circuit setting,
The video data that has been carried out compression by above-mentioned video data compressor circuit is transferred to above-mentioned video data expanded circuit by above-mentioned writing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101650634A CN102237067A (en) | 2010-04-20 | 2010-04-20 | Display device driving circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101650634A CN102237067A (en) | 2010-04-20 | 2010-04-20 | Display device driving circuit and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102237067A true CN102237067A (en) | 2011-11-09 |
Family
ID=44887658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101650634A Pending CN102237067A (en) | 2010-04-20 | 2010-04-20 | Display device driving circuit and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102237067A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05328328A (en) * | 1992-05-25 | 1993-12-10 | Sanyo Electric Co Ltd | Image transmission system |
| US20040066393A1 (en) * | 2002-10-03 | 2004-04-08 | International Business Machines Corporation | Method and apparatus for implementing enlarged virtual screen using dynamic zone-compression of screen content |
| JP2006267172A (en) * | 2005-03-22 | 2006-10-05 | Kawasaki Microelectronics Kk | Image display device and image data correction circuit |
| CN101425277A (en) * | 2007-10-31 | 2009-05-06 | 恩益禧电子股份有限公司 | Liquid crystal display, LCD driver, and operating method of LCD driver |
-
2010
- 2010-04-20 CN CN2010101650634A patent/CN102237067A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05328328A (en) * | 1992-05-25 | 1993-12-10 | Sanyo Electric Co Ltd | Image transmission system |
| US20040066393A1 (en) * | 2002-10-03 | 2004-04-08 | International Business Machines Corporation | Method and apparatus for implementing enlarged virtual screen using dynamic zone-compression of screen content |
| JP2006267172A (en) * | 2005-03-22 | 2006-10-05 | Kawasaki Microelectronics Kk | Image display device and image data correction circuit |
| CN101425277A (en) * | 2007-10-31 | 2009-05-06 | 恩益禧电子股份有限公司 | Liquid crystal display, LCD driver, and operating method of LCD driver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102163416B (en) | Display driving circuit | |
| JP3620521B2 (en) | Image processing apparatus, image transmission apparatus, image receiving apparatus, and image processing method | |
| CN101552916B (en) | DMA transfer method, device and DMA controller for YUV video data | |
| CN105191304B (en) | Image encoding method and device and relevant picture decoding method and device according to pixel data execution position flat scanning coding | |
| CN101425277B (en) | Liquid crystal display, LCD driver, and operating method of lcd driver | |
| CN105100814B (en) | Image coding and decoding method and device | |
| CN101540903B (en) | Method of rate control, video frame encoder and frame compression system thereof | |
| CN103391442A (en) | Rapid video image transmission compression algorithm based on regional division and difference comparison | |
| CN101127907A (en) | Method, medium, and system compressing and/or reconstructing image information with low complexity | |
| CN104769642A (en) | Method and apparatus for reducing digital video image data | |
| CN103609117A (en) | Method and device for encoding and decoding an image | |
| CN103152573A (en) | Method and system for transmitting image frame between mobile terminal and intelligent television set | |
| CN106815875A (en) | The coding of information bitmap, coding/decoding method and device | |
| CN103873805A (en) | Image display apparatus and method | |
| CN110704146A (en) | Focus management method applied to electronic equipment and electronic equipment | |
| CN102271251B (en) | Lossless image compression method | |
| US6584229B1 (en) | Macroblock-based object-oriented coding method of image sequence having a stationary background | |
| EP3635953B1 (en) | Electronic device for high-speed compression processing of feature map of cnn utilizing system and controlling method thereof | |
| US20080181509A1 (en) | Method and Apparatus for a Fast Graphic Rendering Realization Methodology Using Programmable Sprite Control | |
| CN102237067A (en) | Display device driving circuit and display device | |
| KR102401851B1 (en) | Method of compressing image and display apparatus for performing the same | |
| US20050162509A1 (en) | Mobile terminal apparatus and its information displaying method | |
| US20110242112A1 (en) | Display device and driving circuit thereof | |
| CN104966484A (en) | Display panel and driving method thereof | |
| CN114301983A (en) | Method and system for compressing bytes of electronic ink screen picture, electronic equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111109 |