CN101751908A - Frame memory access method and the display drive thereof - Google Patents
Frame memory access method and the display drive thereof Download PDFInfo
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- CN101751908A CN101751908A CN200810179449A CN200810179449A CN101751908A CN 101751908 A CN101751908 A CN 101751908A CN 200810179449 A CN200810179449 A CN 200810179449A CN 200810179449 A CN200810179449 A CN 200810179449A CN 101751908 A CN101751908 A CN 101751908A
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Abstract
The invention relates to a frame memory access method and the display drive thereof. The frame memory access method is a data moving method and enables the display drive integrated circuit of a built-in portrait style frame memory to be also applied to the landscape mode. The principle of the method lies in that data on the portrait style frame memory is read for a plurality of times to a shift register and the data is moved on the shift register to be placed on a correct data latch to combine the data into complete scanning line data so that the portrait style display drive integrated circuit can drive the landscape mode panel.
Description
Technical field
The invention relates to a kind of technology of display driver, and particularly can be used to vertically show and horizontal frame memory access method and the drive device for display that shows relevant for a kind of.
Background technology
Along with the progress of science and technology, mobile phone is also more and more universal, and its function is also more and more.Because mobile phone has begun to have the service of Digital Television at present.In order to meet the specification of Digital Television, mobile phone was the panel that adopts vertical display mode (Portrait mode) in the past, must change the panel of horizontal display mode (Landscape mode) into.
Be efficent use of resources, the design of a display drive integrated circult can be a target can be applied in many different panels usually.With same resolution 320 * 240 (Quarter Video Graphics Array, QVGA) panel is an example, and the challenge that panel derived that same integrated circuit is applied in vertical display mode (Portrait mode) and horizontal display mode (Landscape mode) is how effectively to use the embedded frame memory of integrated circuit (frame memory).Vertically display mode and the horizontal needed frame memory of display mode is big or small identical, but in frame on the quantity of needed sweep trace and every the sweep trace needed pixel quantity different.Vertically the QVGA panel of display mode needs 320 sweep traces, needs 240 pixels on every sweep trace.Laterally the QVGA panel of display mode then is to need 240 sweep traces, but needs 320 pixels on every sweep trace.
Frame memory, based on display drive integrated circult framework, its design can cooperate the demand of the resolution (Resolution) of panel.If the panel of a QVGA needs 320 sweep traces of vertical display mode, and every sweep trace needs 240 pixels, then frame memory then can be designed to have 320 character lines (word line), and each bar character line has 240 * 24 bit lines (bit lines).
Yet, if the display drive integrated circult of above-mentioned vertical display mode will be applied in the panel of horizontal display mode, every character line of the frame memory that it is inner (word line) is with 80 pixel of less than, though the size requirement of total frame memory is identical, but required pixel quantity difference on every sweep trace results in the aforementioned display device drive integrated circult and can't be applied in the panel of horizontal display mode and the panel of vertical display mode simultaneously.
Summary of the invention
In view of this, a purpose of the present invention is exactly at the display driver that a kind of frame memory access method is provided and uses described frame memory access method.
For reaching above-mentioned or other purposes, the present invention proposes a kind of frame memory access method, the method is in order to an image with N * M pixel data, be stored in a storer with M * N storage area, the method comprises the following steps: that with in the above-mentioned image the 1st row to the 1st the 1st of the above-mentioned storer of depositing to M pixel data correspondence of M row is listed as to M row storage area; In above-mentioned image, the 1st row are to the corresponding in regular turn N row storage area, M+1 row storage area to the of depositing above-mentioned storer of N pixel data of M+1 pen to the of M row; When reading the pixel data of the i row that are stored in the above-mentioned image in the above-mentioned storer, the data read that k row storage area in the above-mentioned storer is stored is deposited the position to the 1st of shift register to M, wherein, the k row storage area in the above-mentioned storer stores N pixel data of M+1 pen to the of the i row in the above-mentioned image; N the view data of M+1 pen to the of i row that is stored in the above-mentioned image of above-mentioned shift register is displaced to M+1 to N of above-mentioned shift register deposits the position; And the data read of the i row storage area in the above-mentioned storer deposited the position to the 1st to M of above-mentioned shift register, and wherein, N, M, i, k is natural number, and N＞M, 0＜i＜=N, M＜k＜=N.
According to the described frame memory access method of preferred embodiment of the present invention, be stored in the k row of above-mentioned storer when X pixel data of M+1 pen to the of i row, and when N pixel data of X+1 pen to the of i row is stored in the k+1 row of above-mentioned storer respectively, the method also comprise the following steps: the data read that the k row storage area in the above-mentioned storer is stored to the 1st of shift register to the individual position of depositing of M; X the view data of M+1 pen to the of i row that is stored in the above-mentioned image of above-mentioned shift register is displaced to M+1 to X of above-mentioned shift register deposits the position; The data read that k+1 row storage area in the above-mentioned storer is stored is deposited the position to the 1st of shift register to M; And N the view data of X+1 pen to the of i row that will be stored in the above-mentioned image of above-mentioned shift register be displaced to X+1 to N of above-mentioned shift register and deposit the position, and wherein X is a natural number, and M＜X＜=N.
The present invention proposes a kind of drive device for display in addition, is applicable to drive the panel that a panel or with N * M pixel has M * N pixel, and described drive device for display comprises: a storer, a shift register and one drive circuit.Above-mentioned storer has M * N storage area.Shift register has N register circuit, and wherein, i register circuit couples the capable storage area of i of above-mentioned storer.The input end of i driving circuit couples i register circuit of shift register, and the deposit position of each described these register circuit with a correspondence.When drive device for display in order to drive the panel of the described N of having * M pixel, the driving stage of this drive device for display comprises storage stage and driving stage.When storage stage, the 1st row to the 1st the 1st of the storer of depositing to M pixel data correspondence that M is listed as that will have the image of N * M pixel data is listed as to M row storage area; And with the 1st in image row to the corresponding in regular turn N row storage area, M+1 row storage area to the of depositing storer of N pixel data of M+1 pen to the of M row.During the driving of the i in the stage of driving row, the data read that k row storage area in the storer is stored is deposited the position to the 1st of shift register to M, wherein, the k row storage area in the above-mentioned storer stores N pixel data of M+1 pen to the of i row in the above-mentioned image; M+1 that N the view data of M+1 pen to that is stored in the i row of shift register is displaced to described shift register to the individual position of depositing of N; The data read of the i row storage area in the storer is deposited the position to the 1st to M of shift register; And read the stored data of described these registers so that described these driving circuits drive the pixel that the i of the panel of the described N of having * M pixel is listed as, and wherein, N, M, i, k is natural number, and N＞M, 0＜i＜=N, M＜k＜=N.
The present invention is to propose the method (data moving method) that a kind of data are moved, and makes the built-in display drive integrated circult that is used for vertical frame memory (portrait style frame memory) that shows also can be applied in horizontal display mode.The spirit of the method is that frame memory by repeatedly reading above-mentioned vertical demonstration is to shift register, and data are moved on shift register, be placed into correct data latches (data latch), being combined into complete scan-line data, and send pixel-driving circuit to.Therefore, the display drive integrated circult that vertically shows is driven the panel of horizontal demonstration.
Description of drawings
Fig. 1 is the circuit block diagram of the drive device for display that illustrates according to the embodiment of the invention.
Fig. 2 A is the arrangement plan that is used for illustrating the frame memory 102 of the above embodiment of the present invention.
Fig. 2 B is used for illustrating how the frame memory 102 of the above embodiment of the present invention stores the synoptic diagram of the image of resolution 320 * 240 (laterally display mode).
Fig. 3 A to Fig. 3 D is used for illustrating how the above embodiment of the present invention reads the synoptic diagram of the image of the resolution 320 * 240 (laterally display mode) that is stored in frame memory 102.
Fig. 4 A to Fig. 4 F is used for illustrating how the above embodiment of the present invention reads the synoptic diagram of the image of the resolution 864 * 480 (laterally display mode) that is stored in frame memory 102.
Drawing reference numeral
101: driving circuit
102: storer
103: shift register
DA[01] to DA[80]: digital analog converter
Mux[01] to mux[80]: multiplexer
L[01] to L[80]: data latches
S[01] to S[80]: 80 groups of shift register
Line[1] to line[863]: the storage row of frame memory
301 to 304,401 to 409: the divided block of shift register
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
In order to allow circuit of display driving can be used in the panel of vertical display mode and horizontal display mode, the design of the frame memory of circuit of display driving of the present invention is to adopt the frame memory that vertically shows.For spirit of the present invention is described, below be example with QVGA, described frame memory has 320 character lines (word line), and each bar character line has 240 * 24 bit lines (bit lines).
Fig. 1 is the circuit block diagram of the drive device for display that illustrates according to the embodiment of the invention.Please refer to Fig. 1, this drive device for display comprises one drive circuit 101, a storer 102 and a shift register 103, wherein, driving circuit comprises a plurality of digital analog converter DA[01] to DA[80], a plurality of multiplexer mux[01] to mux[80] and a plurality of data latches L[01] to L[80], shift register 103 comprises a plurality of register circuits, if store a pixel with a register circuit, then each register circuit need store 3 sub-pixels altogether.Because each sub-pixel is 8 positions, so each register circuit has 3 * 8.In addition, in this embodiment, the register circuit of shift register is divided into 80 S[01 of group] to S[80], each group has 12 * 8.
For the two kinds of resolutions of (vertically display modes) and 320 * 240 (laterally display modes) that can be compatible to 240 * 320 simultaneously, be to adopt the employed pixel-driving circuits of 240 * 320 resolutions at the pixel-driving circuit of this circuit of display driving 101.In this embodiment, be to give an example with the configuration of 12: 1 source electrode driver, in order to want to drive 320 pixels (each pixel has 3 sub-pixel R, G, B), 80 passage DA[01 must be arranged] to DA[80], in other words, be exactly always have 80 analog-digital converter DA[01] to DA[80].
In addition, in the present embodiment, storer 102 is the frame memories that adopt vertical display mode (Portrait style).In other words, this frame memory 102 has 320 character lines (word line), respectively corresponding 320 sweep traces.On each bar character line, have 240 * 24 bit lines, the individual pixel of respectively corresponding 240 * 3 (R, G, B).More specifically, among this embodiment, additionally how shift register 103, and the storage area of this shift register 103 has 320 * 24 positions (320 * 3 sub-pixels, 8 of each sub-pixels) altogether.The 1st to the 60th passage DA[01] to DA[60] be each row that corresponds to 240 pixels and frame memory 102.Reach horizontal display mode and need other 20 passage DA[61] to DA[80] with the demonstration demand of corresponding the 241st pixel to 320 pixel.
Fig. 2 A is the arrangement plan that is used for illustrating the frame memory 102 of the above embodiment of the present invention.Fig. 2 B is used for illustrating how the frame memory 102 of the above embodiment of the present invention stores the synoptic diagram of the image of resolution 320 * 240 (laterally display mode).Please refer to Fig. 2 A and Fig. 2 B, because that the image of resolution 320 * 240 and the size of data of the image of resolution 240 * 320 come down to is identical, so frame memory 102 definitely can store.But,, will cause data to be taken out being difficult for and cause the circuit efficiency of operating not good if the mode that stores is to adopt under the situation about arbitrarily storing.At this embodiment, the method for store images data in frame memory 102 is to adopt preceding 240 pixels of each row, is stored in each row storage location of frame memory 102 correspondences.Just 240 pixels in front of the i of view data row are stored in the i row of frame memory 102.At this moment, each row of view data also have 80 pixels not store as yet.Next, remaining 80 pixels of each row of view data are stored in the 241st row of frame memory 102 in regular turn to the 320th row line[239] to line[319].The purpose of this kind storing mode and advantage will after illustrate among the embodiment.
Fig. 3 A to Fig. 3 D is used for illustrating how the above embodiment of the present invention reads the synoptic diagram of the image of the resolution 320 * 240 (laterally display mode) that is stored in frame memory 102.Please refer to Fig. 3 A, in Fig. 3 A, shift register 103 is divided into 4 blocks 301 to 304, and the data of block 301 to 303 can be moved to block 304 respectively.Next, please refer to Fig. 3 B, suppose the data that will take out article one sweep trace this moment, be stored in Line[240] data can be removed earlier, and deposit the block 301 to 303 of shift register 103.Next, please refer to Fig. 3 C, the data of the block 301 of shift register 103 are moved to the block 304 of shift register 103.Next, please refer to Fig. 3 D, take out have Line[0] data, and cover the block 301 to 303 of shift register 103, afterwards, driving circuit 101 just can carry out driving to the display panel of horizontal display mode according to its predetermined driving running program.
Though the foregoing description is with 320 * 240 and 240 * 320 resolutions as an example, yet the present invention does not limit and is applied in above-mentioned resolution, below again for an embodiment so that those skilled in the art can use the present invention widely.Fig. 4 A to Fig. 4 F is used for illustrating how the above embodiment of the present invention reads the synoptic diagram of the image of the resolution 864 * 480 (laterally display mode) that is stored in frame memory 102.In this embodiment, laterally display mode is 864 * 480 be example, and the frame memory 102 that this embodiment provided then is the frame memory that cooperates (vertical display mode) resolution 480 * 864.Please refer to Fig. 4 A, in this embodiment, shift register 103 is divided into 9 blocks 401 to 409, and the data of block 401 to 405 can be moved to block 406 to 409 respectively.
Next, please refer to Fig. 4 B, suppose the data that will take out the second sweep trace this moment, be stored in Line[480] data can be removed earlier, and deposit the block 401 to 405 of shift register 103.Next, please refer to Fig. 4 C, the data of the block 405 of shift register 103 are moved to the block 406 of shift register 103.Next, please refer to Fig. 4 D, have Line[481] data be removed, and cover the block 401 to 405 of shift register 103.Next, please refer to Fig. 4 E, the data of the block 401 to 403 of shift register 103 are moved to the block 407 to 409 of shift register 103 respectively.Afterwards, driving circuit 101 just can carry out driving to the display panel of horizontal display mode according to its predetermined driving running program.
In sum, the present invention is to propose the method that a kind of data are moved, and makes the built-in display drive integrated circult that is used for vertical frame memory (portrait style frame memory) that shows also can be applied in horizontal display mode.The spirit of the method is that frame memory by repeatedly reading above-mentioned vertical demonstration is to shift register, and data are moved on shift register, be placed into correct data latches, being combined into complete scan-line data, and send pixel-driving circuit to.Therefore, the display drive integrated circult that vertically shows is driven the panel of horizontal demonstration.
The specific embodiment that is proposed in the detailed description of preferred embodiment is only in order to convenient explanation technology contents of the present invention, but not with narrow sense of the present invention be limited to the foregoing description, in the situation that does not exceed spirit of the present invention and following claim, the many variations of being done is implemented, and all belongs to scope of the present invention.Therefore protection scope of the present invention is when being as the criterion with claim institute confining spectrum.
Claims (4)
1. a frame memory access method is characterized in that, described frame memory access method is in order to an image with N * M pixel data, is stored in a storer with M * N storage area, and described frame memory access method comprises:
In described image, the 1st row are to the 1st storage area to storage area to the M row of the 1st row that are stored into described storer of M pixel data correspondence of M row;
In described image, the 1st row are to the storage area of storage area to the N row of the corresponding in regular turn M+1 row that are stored into described storer of N pixel data of M+1 pen to the of M row;
When reading the pixel data of the i row that are stored in the described image in the described storer, may further comprise the steps:
The data read that k row storage area in the described storer is stored is deposited the position to the 1st of shift register to M, wherein, the k row storage area in the above-mentioned storer stores N pixel data of M+1 pen to the of the i row in the described image;
N the view data of M+1 pen to the of i row that is stored in the described image of described shift register is displaced to M+1 to N of described shift register deposits the position; And
The data read of the i row storage area in the storer is deposited the position to the 1st to M of described shift register,
Wherein, N, M, i, k is natural number, and N＞M, 0＜i＜=N, M＜k＜=N.
2. frame memory access method as claimed in claim 1, it is characterized in that, be stored in the k row of described storer when X pixel data of M+1 pen to the of i row, and when N pixel data of X+1 pen to the of i row is stored in the k+1 row of described storer respectively, also comprise the following steps:
The data read that k row storage area in the described storer is stored is deposited the position to the 1st of shift register to M;
X the view data of M+1 pen to the of i row that is stored in the described image of described shift register is displaced to M+1 to X of described shift register deposits the position;
The data read that k+1 row storage area in the described storer is stored is deposited the position to the 1st of shift register to M; And
N the view data of X+1 pen to the of i row that is stored in the described image of described shift register is displaced to X+1 to N of described shift register deposits the position,
Wherein, X is a natural number, and M＜X＜=N.
3. a drive device for display is characterized in that, described drive device for display is applicable to and drives the panel that a panel or with N * M pixel has M * N pixel that described drive device for display comprises:
One storer has M * N storage area;
One shift register has N register circuit, and wherein, i register circuit couples the capable storage area of i of described storer;
One drive circuit, wherein, the input end of i driving circuit couples i register circuit of described shift register, and each described these register circuit has the position of depositing of a correspondence,
Wherein, when described drive device for display in order to drive the panel of the described N of having * M pixel, the driving stage of described drive device for display comprises storage stage and driving stage,
Wherein, when storage stage,
The image that will have N * M pixel data, the 1st row to the 1st the 1st of the storer of depositing to M pixel data correspondence of M row is listed as to M row storage area; And
In image, the 1st row are to the corresponding in regular turn N row storage area, M+1 row storage area to the of depositing storer of N pixel data of M+1 pen to the of M row;
During the driving of the i in the stage of driving row,
The data read that k row storage area in the storer is stored is deposited the position to the 1st of shift register to M, and wherein, the k row storage area in the above-mentioned storer stores N pixel data of M+1 pen to the of i row in the above-mentioned image;
M+1 that N the view data of M+1 pen to that is stored in the i row of described shift register is displaced to described shift register to the individual position of depositing of N;
The data read of the i row storage area in the storer is deposited the position to the 1st to M of described shift register; And
Read the stored data of described these registers so that described these driving circuits drive the pixel that the i of the panel of the described N of having * M pixel is listed as,
Wherein, N, M, i, k is natural number, and N＞M, 0＜i＜=N, M＜k＜=N.
4. drive device for display as claimed in claim 3, it is characterized in that, each described these pixel data has p sub-pixel, each sub-pixel has the q position, described these register circuits of described shift register are divided into a plurality of groups of depositing, each group has p * q * r position, and described driving circuit comprises:
N/r p * q * r bit data latch, corresponding described these that couple are deposited group;
N/r p * q * r be to the q multiplexer, corresponding described these the p * q * r bit data latch that couples; And
N/ (the individual q of p * r) position analog-digital converter, corresponding couples described these p * q * r to the q multiplexer,
Wherein, p, q, r are natural number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101794493A CN101751908B (en) | 2008-11-28 | 2008-11-28 | Frame memory access method and the display drive thereof |
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| CN2008101794493A CN101751908B (en) | 2008-11-28 | 2008-11-28 | Frame memory access method and the display drive thereof |
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| CN101751908A true CN101751908A (en) | 2010-06-23 |
| CN101751908B CN101751908B (en) | 2011-12-14 |
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| JPH06102842A (en) * | 1990-08-06 | 1994-04-15 | Texas Instr Inc <Ti> | Graphic display system including video random access memory having divided serial register and operation counter |
| JP2003066938A (en) * | 2001-08-24 | 2003-03-05 | Sharp Corp | Display controller, display control method and image display system |
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