CN101751908B - 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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- CN101751908B CN101751908B CN2008101794493A CN200810179449A CN101751908B CN 101751908 B CN101751908 B CN 101751908B CN 2008101794493 A CN2008101794493 A CN 2008101794493A CN 200810179449 A CN200810179449 A CN 200810179449A CN 101751908 B CN101751908 B CN 101751908B
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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 walks to the 1st capable the 1st of the above-mentioned storer of depositing to M pixel data correspondence of M walks to the capable storage area of M; In above-mentioned image, the 1st walks to the corresponding in regular turn capable storage area of capable storage area to the N of the M+1 that deposits above-mentioned storer of N pixel data of the capable M+1 pen to the of M; When reading the capable pixel data of the i that is stored in the above-mentioned image in the above-mentioned storer, the data read that the capable storage area of k in the above-mentioned storer is stored is deposited the position to the 1st of shift register to M, wherein, the capable storage area of k in the above-mentioned storer stores capable N the pixel data of M+1 pen to the of i in the above-mentioned image; Deposit the position for M+1 to N that capable N the view data of M+1 pen to the of i that is stored in the above-mentioned image of above-mentioned shift register is displaced to above-mentioned shift register; And the data read of the capable storage area of i 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, the k that is stored in above-mentioned storer when capable X the pixel data of M+1 pen to the of i is capable, and when the k+1 that N pixel data of X+1 pen to that i is capable is stored in above-mentioned storer respectively was capable, the method comprised the following steps: that also the data read that the capable storage area of k in the above-mentioned storer is stored deposits the position to the 1st of shift register to M; Deposit the position for M+1 to X that capable X the view data of M+1 pen to the of i that is stored in the above-mentioned image of above-mentioned shift register is displaced to above-mentioned shift register; The data read that the capable storage area of k+1 in the above-mentioned storer is stored is deposited the position to the 1st of shift register to M; And capable N the view data of X+1 pen to the of i that will be stored in the above-mentioned image of above-mentioned shift register X+1 of being displaced to above-mentioned shift register deposits the position to N, 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 storage area of the i row 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, will have the 1st the walking to the 1st capable the 1st of the storer of depositing of M and walk to the capable storage area of M of image of N * M pixel data to M pixel data correspondence; And the 1st in the image walked to the corresponding in regular turn capable storage area of capable storage area to the N of the M+1 that deposits storer of N pixel data of the capable M+1 pen to the of M.During the capable driving of the i in the stage of driving, the data read that the capable storage area of k in the storer is stored is deposited the position to the 1st of shift register to M, wherein, the capable storage area of k in the above-mentioned storer stores N pixel data of M+1 pen to that i is capable in the above-mentioned image; Deposit the position for M+1 to N that capable N the view data of M+1 pen to the of i that is stored in shift register is displaced to described shift register; The data read of the capable storage area of i 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 capable pixel of i of the panel of the described N of having * M pixel, 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 stored 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 the source electrode driver of 12:1, 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 preceding 240 pixels that adopt each row, is stored in each row storage location of frame memory 102 correspondences.Just 240 pixels in the front that the i of view data is capable i of being stored in frame memory 102 is capable.At this moment, each row of view data also has 80 pixels not store as yet.Next, remaining 80 pixels of each row of view data are stored in the 241st of frame memory 102 in regular turn and walk 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 walks to the 1st the capable capable storage area of storage area to the M to the 1st row that is stored into described storer of M pixel data correspondence of M;
In described image, the 1st walks to the corresponding in regular turn capable capable storage area of storage area to the N of the M+1 that is stored into described storer of N pixel data of the capable M+1 pen to the of M;
When reading the capable pixel data of the i that is stored in the described image in the described storer, may further comprise the steps:
The data read that the capable storage area of k in the described storer is stored is deposited the position to the 1st of shift register to M, wherein, the capable storage area of k in the above-mentioned storer stores capable N the pixel data of M+1 pen to the of i in the described image;
Deposit the position for M+1 to N that capable N the view data of M+1 pen to the of i that is stored in the described image of described shift register is displaced to described shift register; And
The data read of the capable storage area of j in the storer is deposited the position to the 1st to M of described shift register,
Wherein, N, M, i, k, j are natural number, and N＞M, 0＜i＜=N, M＜k＜=N, j＜M.
2. frame memory access method as claimed in claim 1, it is characterized in that, the k that is stored in described storer when capable X the pixel data of M+1 pen to the of i is capable, and when the k+1 that N pixel data of X+1 pen to that i is capable is stored in described storer respectively is capable, also comprise the following steps:
The data read that the capable storage area of k in the described storer is stored is deposited the position to the 1st of shift register to M;
Deposit the position for M+1 to X that capable X the view data of M+1 pen to the of i that is stored in the described image of described shift register is displaced to described shift register;
The data read that the capable storage area of k+1 in the described storer is stored is deposited the position to the 1st of shift register to M; And
Deposit the position for X+1 to N that capable N the view data of X+1 pen to the of i that is stored in the described image of described shift register is displaced to described shift register,
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 storage area of the i row 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 walks to the 1st capable the 1st of the storer of depositing to M pixel data correspondence of M walks to the capable storage area of M; And
In image, the 1st walks to the corresponding in regular turn capable storage area of capable storage area to the N of the M+1 that deposits storer of N pixel data of the capable M+1 pen to the of M;
During the capable driving of the i in the stage of driving,
The data read that the capable storage area of k in the storer is stored is deposited the position to the 1st of shift register to M, and wherein, the capable storage area of k in the above-mentioned storer stores N pixel data of M+1 pen to that i is capable in the above-mentioned image;
Deposit the position for M+1 to N that capable N the view data of M+1 pen to the of i that is stored in described shift register is displaced to described shift register;
The data read of the capable storage area of j 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 in regular turn so that described these driving circuits drive the capable pixel of i of the panel of the described N of having * M pixel,
Wherein, N, M, i, k, j are natural number, and N＞M, 0＜i＜=N, M＜k＜=N, j＜M.
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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| 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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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0474366A2 (en) * | 1990-08-06 | 1992-03-11 | Texas Instruments Incorporated | Graphics display system including a video random access memory with a split serial register and a run counter |
| CN1402205A (en) * | 2001-08-24 | 2003-03-12 | 夏普株式会社 | Display controller, display control method and picture display system |
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- 2008-11-28 CN CN2008101794493A patent/CN101751908B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0474366A2 (en) * | 1990-08-06 | 1992-03-11 | Texas Instruments Incorporated | Graphics display system including a video random access memory with a split serial register and a run counter |
| CN1402205A (en) * | 2001-08-24 | 2003-03-12 | 夏普株式会社 | Display controller, display control method and picture display system |
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