CN101645256A - Generator of overdrive lookup table of liquid crystal display device and generating method thereof - Google Patents
Generator of overdrive lookup table of liquid crystal display device and generating method thereof Download PDFInfo
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Abstract
The invention relates to a generator of an overdrive lookup table of a liquid crystal display device and a generating method thereof. The generating method comprises the following steps: firstly, a plurality of initial overdrive grey-scale values in an initial overdrive lookup table are respectively subtracted a plurality of specific grey-scale values of current frame information, the absolute value is selected to acquire an absolute difference overdrive lookup table; secondly, according to a specific grey-scale range, the absolute difference overdrive lookup table is divided into a pluralityof blocks to be encoded; and thirdly, numerical values in the blocks to be encoded are encoded to acquire a plurality of encoded blocks correspondingly, so that a target overdrive lookup table of theencoded blocks is acquired. The encoded blocks are provided with a plurality of encoding values respectively, and the total bit of the encoding values stored in the target overdrive lookup table is less than the total bit of the initial overdrive grey-scale values. The generated overdrive lookup table occupies less storage space, and has the initial overdrive lookup table used for storing a plurality of initial overdrive grey-scale values.
Description
Technical field
The present invention relates to a kind of generator and production method thereof of look-up table of display device, and particularly relevant for a kind of generator and production method thereof of over-driving look-up table of liquid crystal indicator.
Background technology
In many flat-panel screens, (Liquid Crystal Display LCD) becomes the main flow in market now because of having plurality of advantages to liquid crystal indicator.Yet liquid crystal indicator is hiding because of the too late problem that causes poor display of liquid crystal molecule reaction velocity.In order to promote the reaction velocity of liquid crystal molecule, (overdrive, OD) technology is suggested a kind of overdriving.This technology is to see through an overdrive circuit (overdrive circuit) to provide the general high overdrive voltage (overdrive voltage) of driving voltage to improve the reaction velocity of liquid crystal molecule, makes display frame reach desirable brightness.On the practice, overdrive voltage can see through will adjacent two drawing frame data picture data (for example luma data) be sent to a driving look-up table (overdrive table, OD table) with the action of tabling look-up, and carry out interpolative operation according to checking result and obtain.
Particularly, as the block schematic diagram of a kind of traditional overdrive circuit that Figure 1A illustrated.Overdrive circuit 100 comprises a sorting unit (sort) 110, a plurality of over-driving look-up table 102a, 102b, 102c, 102d and an interpolation (Interpolation) unit 120, and wherein over-driving look-up table 102a, 102b, 102c, 102d are coupled between sorting unit 110 and the interpolation unit 120.
In general, with regard to the liquid crystal indicator of display frame that GTG value 0～255 is provided, over-driving look-up table 102a, 102b, 102c, 102d take the complexion of the over-driving look-up table 102 that illustrates as Figure 1B usually.Wherein, 16 specific grey-scale values of 16 specific grey-scale values of picture frame data and a last drawing frame data can correspondence go out 256 GTG values of overdriving at present, and these 16 specific grey-scale values are respectively 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224 and 240.
Please be simultaneously with reference to Figure 1A and Figure 1B, at first, sorting unit 110 receives on one a drawing frame data and present both picture data F of drawing frame data
N-1And F
n(for example luma data), and sort out a highest byte (Most Significant Byte, MSB) the data F of a drawing frame data
N-1, MSB, a present highest byte data F of drawing frame data
N, MSB, a last drawing frame data a lowest byte (Least Significant Byte, LSB) data F
N-1, LSBAn and lowest byte data F of present drawing frame data
N, LSBFour data.
Continue it, with a last drawing frame data and present both highest byte data F of drawing frame data
N-1, MSBAnd F
N, MSBBe sent among over-driving look-up table 102a, 102b, 102c, the 102d, with the action of tabling look-up.Afterwards, the data that over-driving look-up table 102a, 102b, 102c, 102d are exported can be sent to interpolation unit 120, and interpolation unit 120 just can carry out the GTG value of overdriving that interpolative operation was handled in the hope of interpolation.
By Figure 1B as can be known, the maximal value in these GTG values of overdriving is 250, and it occupies the storage area of 8 (bit).Yet, have 256 GTG values of overdriving in the over-driving look-up table 102, thereby overdrive technique must spend the high cost beginning a large amount of storage areas can be provided.
Summary of the invention
The invention provides a kind of generator and production method thereof of over-driving look-up table of liquid crystal indicator, the over-driving look-up table that it produced occupies less storage space.
The present invention proposes a kind of production method of over-driving look-up table (OD table) of liquid crystal indicator, wherein liquid crystal indicator has in order to storing an initial over-driving look-up table of a plurality of GTG values of initially overdriving, and the production method of the over-driving look-up table of liquid crystal indicator of the present invention comprises the following steps.At first, a plurality of specific grey-scale values numerical value afterwards that the GTG value of initially overdriving is deducted a present picture frame data takes absolute value again, to obtain an absolute difference (absolute difference) over-driving look-up table.Then, according to a specific grey-scale range, the absolute difference over-driving look-up table is divided into a plurality of blocks to be encoded.Afterwards, the numerical value for the treatment of in the encoded block is encoded, and obtains a plurality of encoded block with correspondence, so obtains to have those target over-driving look-up tables of encoded block.These encoded block have a plurality of encoded radios respectively, and the total bit of the stored encoded radio of target over-driving look-up table is less than the total bit of the GTG value of initially overdriving.
The present invention proposes a kind of generator of over-driving look-up table of liquid crystal indicator in addition, and wherein liquid crystal indicator has in order to store an initial over-driving look-up table of a plurality of GTG values of initially overdriving.The generator of the over-driving look-up table of liquid crystal indicator of the present invention comprises an absolute difference arithmetic element and a block coding unit, and wherein the block coding unit couples the absolute difference arithmetic element.The absolute difference arithmetic element numerical value that the GTG value deducts after a plurality of specific grey-scale values of a present picture frame data of will initially overdriving takes absolute value again, to obtain an absolute difference over-driving look-up table.The block coding unit is according to a specific grey-scale range, the absolute difference over-driving look-up table is divided into a plurality of blocks to be encoded, and the numerical value for the treatment of in the encoded block is encoded, obtain a plurality of encoded block with correspondence, so obtain to have these target over-driving look-up tables of encoded block.In addition, these encoded block have a plurality of encoded radios respectively, and the total bit of the stored encoded radio of target over-driving look-up table is less than the total bit of the GTG value of initially overdriving.
In an embodiment of the production method of the over-driving look-up table of liquid crystal indicator of the present invention and generator, the corresponding relation of a plurality of specific grey-scale values of a drawing frame data on the specific grey-scale value and of the present drawing frame data of GTG value representation of initially overdriving.
In an embodiment of the production method of the over-driving look-up table of liquid crystal indicator of the present invention and generator, at present the number of a plurality of specific grey-scale values of a drawing frame data is all N on the specific grey-scale value and of drawing frame data, the number of the GTG value of so initially overdriving be N square.In one embodiment, the number of block to be encoded be N square the factor.
In an embodiment of the production method of the over-driving look-up table of liquid crystal indicator of the present invention and generator, the step that the GTG value of initially overdriving is deducted the specific grey-scale value of present drawing frame data comprises: the GTG value of initially overdriving of i row is deducted i specific grey-scale value of present picture frame data, and wherein i is a positive integer.
In an embodiment of the production method of the over-driving look-up table of liquid crystal indicator of the present invention and generator, the block coding unit is set at a maximal value identification code with the maximal value in each block to be encoded, and the minimum value in each block to be encoded is set at a minimum value identification code, and the numerical value that the maximal value in each block to be encoded is deducted minimum value is set at a difference identification code according to this, and a difference identification code in each block to be encoded and a reference value are set at a pattern-recognition sign indicating number according to this.In one embodiment, when the block coding unit was more judged difference identification code in each block to be encoded smaller or equal to reference value, the pattern-recognition sign indicating number that the block coding unit is produced was 0; And when the block coding unit was more judged difference identification code in each block to be encoded greater than reference value, the pattern-recognition sign indicating number that the block coding unit is produced was 1.
In an embodiment of the production method of the over-driving look-up table of liquid crystal indicator of the present invention and generator, in each block to be encoded, when the pattern-recognition sign indicating number is 0, the block coding unit more deducts the minimum value identification code respectively with the numerical value in the block to be encoded, to obtain the encoded radio in the corresponding encoded block.Otherwise in each block to be encoded, when the pattern-recognition sign indicating number was 1, the block coding unit more deducted the numerical value in the block to be encoded respectively minimum value identification code numerical value afterwards again divided by 2, to obtain the encoded radio in the corresponding encoded block.In one embodiment, in each block to be encoded, when the pattern-recognition sign indicating number was 0, the block coding unit more deducted the minimum value identification code respectively with the numerical value in the block to be encoded, to obtain the encoded radio in the corresponding encoded block.Otherwise, in each block to be encoded, when the pattern-recognition sign indicating number was 1, the block coding unit carried out an integer computing divided by 2 earlier after more the numerical value in the block to be encoded being deducted the minimum value identification code respectively again, to obtain the encoded radio in the corresponding encoded block.In one embodiment, to carry out the method for integer computing can be unconditionally to cast out in the block coding unit.
In an embodiment of the production method of the over-driving look-up table of liquid crystal indicator of the present invention and generator, the generator of the over-driving look-up table of liquid crystal indicator more comprises a block decoding unit.The block decoding unit couples the block coding unit, and the block decoding unit is more deciphered encoded radio.In one embodiment, in the encoded block, block decoding unit judgment model identification code is 0 o'clock at each, and block decoding unit each encoded radio in the encoded block adds the minimum value identification code; Otherwise in the encoded block, block decoding unit judgment model identification code is 1 o'clock at each, and the block decoding unit numerical value that multiply by after 2 of each encoded radio in the encoded block adds the minimum value identification code more respectively.
Based on above-mentioned, the generator of the over-driving look-up table of liquid crystal indicator of the present invention and production method thereof can be encoded to the GTG value of initially overdriving in the initial over-driving look-up table, to produce the less target over-driving look-up table in storage area.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Figure 1A illustrates a kind of block schematic diagram of traditional overdrive circuit.
Figure 1B illustrates a kind of traditional over-driving look-up table.
Fig. 2 illustrates the block schematic diagram of generator of over-driving look-up table of the liquid crystal indicator of one embodiment of the invention.
Fig. 3 A illustrates the difference over-driving look-up table of one embodiment of the invention.
Fig. 3 B illustrates the absolute difference over-driving look-up table of one embodiment of the invention.
Fig. 3 C illustrates the absolute difference over-driving look-up table that is divided into a plurality of blocks to be encoded of one embodiment of the invention.
Fig. 3 D illustrates maximal value identification code, minimum value identification code, difference identification code and the pattern-recognition sign indicating number in each block to be encoded of one embodiment of the invention.
Fig. 3 E illustrates the block to be encoded under a kind of pattern-recognition sign indicating number of one embodiment of the invention and both graphs of a relation of encoded block.
Fig. 3 F illustrates the block to be encoded under another kind of pattern-recognition sign indicating number of one embodiment of the invention and both graphs of a relation of encoded block.
Fig. 4 illustrates the block schematic diagram of a kind of overdrive circuit of one embodiment of the invention.
Fig. 5 illustrates the production method process flow diagram of over-driving look-up table of the liquid crystal indicator of one embodiment of the invention.
[primary clustering symbol description]
100,400: overdrive circuit
102,102a, 102b, 102c, 102d: over-driving look-up table
110,410: sorting unit
120,420: interpolation unit
202,402a, 402b, 402c, 402d: target over-driving look-up table
210: the generator of over-driving look-up table
212: the absolute difference arithmetic element
214: the block coding unit
216,416: the block decoding unit
302: the difference over-driving look-up table
304: the absolute difference over-driving look-up table
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P: block to be encoded
F
N-1, F
n, F
N-1, MSB, F
N, MSB, F
N-1, LSB, F
N, LSB: picture data
S501, S503, S505: step
α, β: encoded block
Embodiment
Fig. 2 illustrates the block schematic diagram of generator of over-driving look-up table of the liquid crystal indicator of one embodiment of the invention.Please refer to Fig. 2, the generator 210 of the over-driving look-up table of the liquid crystal indicator of present embodiment (not illustrating) comprises an absolute difference arithmetic element 212 and a block coding unit 214, and wherein block coding unit 214 couples absolute difference arithmetic element 212.
In the present embodiment, the generator 210 of over-driving look-up table can carry out computing to a plurality of GTG values of initially overdriving stored in the initial over-driving look-up table (OD table), to produce a target over-driving look-up table 202 of less figure place.For convenience of description, the greyscale resolution of present embodiment hypothesis liquid crystal indicator is 8, that is liquid crystal indicator comes show image with 0～255 GTG, and the initial over-driving look-up table of the hypothesis present embodiment over-driving look-up table 102 that for example adopts Figure 1B and illustrated, that is present embodiment adopts the corresponding relation of present picture frame data in the prior art and last both specific grey-scale values of a drawing frame data as the GTG value of initially overdriving.Further say, the present picture frame data of present embodiment and a last picture frame data all have 16 specific grey-scale values (for example 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224 and 240), thus the number of the corresponding GTG value of initially overdriving that goes out be 256 (promptly 16 square).
What pay special attention to is that above-mentioned setting value is not that the user can change according to actual demand in order to qualification the present invention.Next, illustrate the generator and the production method thereof of the over-driving look-up table of present embodiment, but the present invention is not illustrated as all of the embodiments of the present invention below not limiting.
First embodiment
In the present embodiment, absolute difference arithmetic element 212 is at first carried out computing to the GTG value of initially overdriving in the initial over-driving look-up table (for example over-driving look-up table 102 of Figure 1B), and further this initial over-driving look-up table is converted to an absolute difference (absolute difference) over-driving look-up table.
Particularly, the absolute difference arithmetic element 212 GTG value correspondence of will initially overdriving deducts the specific grey-scale value of present drawing frame data, wherein the present embodiment mode of utilizing the GTG value of initially overdriving of i row to deduct i specific grey-scale value of present drawing frame data is reached this action, and i is a positive integer.That is to say, shown in Figure 1B, first is listed as the specific grey-scale value (for example being 0) that the GTG value (for example being all 0) of initially overdriving deducts first row, the GTG value and secondary series is initially overdrived (for example 18,16,16,16,16,16,16,16,16,16,16,16,16,16,16 and 16) deduct the specific grey-scale value (for example being 16) of secondary series, and the 3rd row GTG value (for example 34 of initially overdriving, 34,32,32,32,32,32,32,32,32,32,32,32,32,30 and 26) deduct tertial specific grey-scale value (for example being 32), the numerical operation of all the other row by that analogy.So, can obtain difference (difference) over-driving look-up table 302 that illustrated as Fig. 3 A.
Hold above-mentionedly, because that the online numerical value in diagonal angle among Figure 1B and the specific grey-scale of drawing frame data at present are worth is identical, thereby the online GTG value in the diagonal angle among Fig. 3 A is all 0.In addition, in Fig. 3 A, the right side of the numerical value that the diagonal angle is online has negative, and the left side of the online numerical value in diagonal angle is all positive number.Present embodiment further takes absolute value to the numerical value in the difference over-driving look-up table 302 of Fig. 3 A, to obtain the absolute difference over-driving look-up table 304 that Fig. 3 B is illustrated.In brief, absolute difference over-driving look-up table 304 stores the numerical value more than or equal to 0.
Next, block coding unit 214 is divided into a plurality of blocks to be encoded with the absolute difference over-driving look-up table 304 of Fig. 3 B, for example 16 block A to be encoded, B, C, D, E, F, G, H, I, J, K, L, M, N, O and P being illustrated of Fig. 3 C.In the present embodiment, above-mentioned block A～P to be encoded is for example divided according to a specific grey-scale range in block coding unit 214, wherein specific grey-scale range for example is that 16 specific grey- scale values 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224 and 240 are divided into four parts, that is is divided into (0,16,32,48), (64,80,96,112), (128,144,160,176) and (192,208,224,240) four parts.
Need to prove that the number of the block A～P to be encoded of present embodiment (promptly 16) just is the factor of the number of the GTG value of initially overdriving (promptly 256), thereby the numerical value of each block A～P to be encoded with same number, but the invention is not restricted to this.That is to say that it is unique dividing mode that the present invention does not limit above-mentioned dividing mode, and the actual division mode should be decided on the demand of product.
In the present embodiment, the existence of block A～P to be encoded can be used to the corresponding encoded block (being detailed later) that produces in the subsequent step, and wherein the encoded radio (being detailed later) in the encoded block can see through block coding unit 214 and treats numerical value among encoded block A～P respectively and encode and form.
Specifically, block coding unit 214 is set at a maximal value identification code with the maximal value among each block A～P to be encoded.In other words, respectively according to the maximal value among block A to be encoded, B, C, D, E, F, G, H, I, J, K, L, M, N, O and the P, can correspondence setting out the maximal value identification code is 8,35,49,44,2,10,49,34,6,16,17,32,14,47,59 and 56.
On the other hand, block coding unit 214 more can be set at a minimum value identification code with the minimum value among each block A～P to be encoded.Meaning promptly, respectively according to the minimum value among block A to be encoded, B, C, D, E, F, G, H, I, J, K, L, M, N, O and the P, can correspondence setting out the minimum value identification code is 0,2,23,10,0,0,5,10,0,3,0,8,0,12,10 and 0.
In addition, the maximal value in each block to be encoded can be deducted the setting value of minimum value again be a difference identification code in block coding unit 214.In other words, deduct the difference of minimum value respectively according to maximal value among block A to be encoded, B, C, D, E, F, G, H, I, J, K, L, M, N, O and the P, can correspondence setting out the difference identification code is 8,33,26,34,2,10,44,24,6,13,17,24,14,35,49 and 56.
In addition, in each block to be encoded, block coding unit 214 also can compare a difference identification code and a reference value, and sets out a pattern-recognition sign indicating number according to comparative result.More particularly, present embodiment hypothetical reference value is 31, and the comparative result of hypothesis difference identification code and reference value 31 is: when block coding unit 214 was judged the difference identification code greater than reference value 31, the mode value identification code that block coding unit 214 is produced was 1; Otherwise when block coding unit 214 was judged the difference identification code smaller or equal to reference value 31, the mode value identification code that block coding unit 214 is produced was 0.So, after above-mentioned difference identification code 8,33,26,34,2,10,44,24,6,13,17,24,14,35,49 and 56 made comparisons with reference value 31 respectively, can correspondence trying to achieve the mode value identification code was 0,1,0,1,0,0,1,0,0,0,0,0,0,1,1 and 1.
Based on above-mentioned, the maximal value identification code of present embodiment, minimum value identification code, difference identification code and pattern-recognition sign indicating number are roughly set and are finished, shown in Fig. 3 D.
Please be simultaneously with reference to Fig. 3 C and Fig. 3 D, with regard to block A to be encoded, C, E, F, H, I, J, K, L and M that the pattern-recognition sign indicating number is 0, the mode of encoding in block coding unit 214 is: the numerical value among block A to be encoded, C, E, F, H, I, J, K, L and the M is deducted its pairing minimum value identification code 0,23,0,0,10,0,3,0,8 and 0 respectively, to obtain each encoded radio in the corresponding encoded block.
With block A to be encoded is example, and block coding unit 214 is with district to be encoded
Numerical value among the piece A
All deduct after the minimum value identification code 0, the encoded radio that just can try to achieve among the encoded block α is
As figure
Shown in the 3E.So, can analogize and learn that all the other pattern-recognition sign indicating numbers are the coding method of 0 block C to be encoded, E, F, H, I, J, K, L and M, do not add narration at this.
On the other hand, referring again to Fig. 3 C and Fig. 3 D, with regard to block B to be encoded, D, G, N, O and P that the pattern-recognition sign indicating number is 1, the mode of encoding in block coding unit 214 is: the numerical value among block B to be encoded, D, G, N, O and the P is deducted respectively after its pairing minimum value identification code 2,10,5,12,10 and 0, again divided by 2, to obtain each encoded radio in the corresponding encoded block.
With block B to be encoded is example, and block coding unit 214 is with district to be encoded
Numerical value among the piece B
All deduct after the minimum value identification code 2, can try to achieve earlier
Then these numerical value are all again divided by 2, and the encoded radio that just can obtain among the encoded block β is
Shown in Fig. 3 F.Special one what carry is that present embodiment is to adopt an integer computing of unconditional casting out to carry out above-mentioned division arithmetic at this.Therefore, when all the other pattern-recognition sign indicating numbers are 1 block D to be encoded, G, N, O and P when encoding, if be not integer through the numerical value after the division arithmetic, the integer that makes in the mode of unconditionally casting out equally then.Yet the present invention is as limit, in the application of actual product, also may use round up, the mode of unimpeded access or other integer encodes.
Thus, by above-mentioned 16 the target over-driving look-up table 202 (being illustrated in Fig. 2) that constituted of encoded block (for example α, β etc.) just can obtain.So far, the production method of the over-driving look-up table of present embodiment is roughly finished.
Please continue with reference to Fig. 2, target over-driving look-up table 202 is stored in the internal memory usually.In the present embodiment, store any the required figure place of encoded block (for example α or β) be: store an encoded radio with 5, one of them has 16 encoded radios in the encoded block, and with 8 storage minimum value identification codes, and with 1 storage mode identification code.So, can calculate encoded block (for example α or β) (i.e. storage area of 5 * 16+8+1=89) that only needs 89.
Yet, compared to the preceding initial over-driving look-up table (being the over-driving look-up table 102 of the disclosed Figure 1B of prior art) of encoding as yet, its each GTG value of initially overdriving occupies 8 storage area, thereby 16 GTG values of initially overdriving occupy 128 storage area altogether.Hence one can see that, and the total bit of the encoded radio that the target over-driving look-up table of present embodiment 202 is stored can be less than the total bit of the GTG value of initially overdriving, thereby the occupied storage area of present embodiment is less.This measure can reduce the layout size of overdrive circuit, and then reduces cost.
In the application of actual product, a block decoding unit 216 that is coupled to block coding unit 214 also can be set in the generator 210 of over-driving look-up table, further stored data of encoded block (for example α, β etc.) are deciphered, as shown in Figure 2.
Specifically, block decoding unit 216 can be obtained each stored 16 encoded radios, minimum value identification code and pattern-recognition sign indicating number in the encoded block (for example α, β etc.) from target over-driving look-up table 202, with the action of deciphering.In the present embodiment, if block decoding unit 216 judges that the pattern-recognition sign indicating number of encoded block (for example α) is 0, then Yi Ma method be utilize block decoding unit 216 16 encoded radios in the encoded block (for example α) add the minimum value identification code; Otherwise, if block decoding unit 216 judges that the pattern-recognition sign indicating number of encoded block (for example β) is 1, then Yi Ma method be utilize block decoding unit 216 the numerical value that multiply by earlier respectively after 2 of 16 encoded radios in the encoded block (for example β) add the minimum value identification code more respectively.
Based on above-mentioned notion, in the overdrive circuit 400 that the generator 210 of the over-driving look-up table of present embodiment can be applicable to illustrate as Fig. 4.Furthermore, the overdrive circuit 400 of this enforcement comprises a sorting unit (sort) 410, a plurality of target over-driving look-up table 402a, 402b, 402c, 402d, a block decoding unit 416 and an interpolation (Interpolation) unit 420, wherein sorting unit 410 is coupled to target over-driving look-up table 402a, 402b, 402c, 402d, and block decoding unit 416 is coupled between over-driving look-up table 402a, 402b, 402c, 402d and the interpolation unit 420.
Hold above-mentionedly, sorting unit 410 receives last drawing frame data and both picture data F of drawing frame data at present
N-1And F
n(for example luma data), and sort out the highest byte data F of a drawing frame data
N-1, MSB, at present highest byte (Most Significant Byte, MSB) the data F of drawing frame data
N, MSB, a last drawing frame data lowest byte (LeastSignificant Byte, LSB) data F
N-1, LSBAnd the lowest byte data F of present drawing frame data
N, LSBFour data.Then, present embodiment is with a last drawing frame data and present both highest byte data F of drawing frame data
N-1, MSBAnd F
N, MSBBe sent to target over-driving look-up table 402a, 402b, 402c, 402d, with the action of tabling look-up; On the other hand, F
N-1, LSBAnd F
N, LSBTwo data then are sent to interpolation unit 420 and carry out interpolative operation.Subsequently, block decoding unit 416 can be obtained corresponding codes value, minimum value identification code and pattern-recognition sign indicating number from target over-driving look-up table 402a, 402b, 402c, 402d respectively, with the action of deciphering.Afterwards, the data that block decoding unit 416 is exported are sent to interpolation unit 420, try to achieve the GTG value of handling through interpolation of overdriving in order to interpolation unit 420 carries out interpolative operation.
Yet, but the decoding of the decoding action reference block decoding unit 216 that block decoding unit 416 is carried out action, and the interpolative operation that interpolation unit 420 is carried out not is the technology emphasis that present embodiment institute desire is set forth, thereby do not add to give unnecessary details at this.
Second embodiment
The narration of first embodiment is put in order, and the present invention provides a kind of production method of over-driving look-up table of liquid crystal indicator in addition, for example the production method process flow diagram of the over-driving look-up table of the liquid crystal indicator that Fig. 5 illustrated.Wherein, the liquid crystal indicator of present embodiment (not illustrating) has in order to store an initial over-driving look-up table of a plurality of GTG values of initially overdriving.
Please refer to Fig. 5, at first, in step S501, the specific grey-scale value numerical value afterwards that the GTG value of initially overdriving is deducted present drawing frame data takes absolute value again, to obtain an absolute difference over-driving look-up table.
Then, in step S503,, the absolute difference over-driving look-up table is divided into a plurality of blocks to be encoded according to a specific grey-scale range.
Afterwards, in step S505, the numerical value for the treatment of in the encoded block is encoded, and obtains a plurality of encoded block with correspondence, and further obtain to have these target over-driving look-up tables of encoded block, wherein these encoded block have a plurality of encoded radios respectively.In the present embodiment, the total bit of the stored encoded radio of target over-driving look-up table is less than the total bit of the GTG value of initially overdriving.
All the other details and advantage as for the production method of the over-driving look-up table of the liquid crystal indicator of present embodiment have been included among above-mentioned first embodiment, so do not add tired stating at this.
In sum, the generator of the over-driving look-up table of liquid crystal indicator of the present invention and production method thereof can make conventional art need use the situation of a large amount of storage areas to obtain significantly to improve, and then reduce the layout size of overdrive circuit and reduce cost of products.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (20)
1. the production method of the over-driving look-up table of a liquid crystal indicator, it is characterized in that: described liquid crystal indicator has in order to store an initial over-driving look-up table of a plurality of GTG values of initially overdriving, and wherein the production method of the over-driving look-up table of this liquid crystal indicator comprises:
The a plurality of specific grey-scale values that those GTG values of initially overdriving deducted a present picture frame data take absolute value afterwards again, to obtain an absolute difference over-driving look-up table;
According to a specific grey-scale range, this absolute difference over-driving look-up table is divided into a plurality of blocks to be encoded; And
Numerical value in those blocks to be encoded is encoded, obtain a plurality of encoded block with correspondence, so obtain to have those target over-driving look-up tables of encoded block, wherein those encoded block have a plurality of encoded radios respectively, and the total bit of stored those encoded radios of this target over-driving look-up table is less than the total bit of those GTG values of initially overdriving.
2. the production method of the over-driving look-up table of liquid crystal indicator according to claim 1 is characterized in that: the corresponding relation of a plurality of specific grey-scale values of a drawing frame data on those specific grey-scale values and one of those these present picture frame data of GTG value representation of initially overdriving wherein.
3. the production method of the over-driving look-up table of liquid crystal indicator according to claim 1, it is characterized in that: wherein the number of a plurality of specific grey-scale values of a drawing frame data is all N on those specific grey-scale values and one of this present drawing frame data, so the number of those GTG values of initially overdriving be N square; Wherein the number of those blocks to be encoded be N square the factor.
4. the production method of the over-driving look-up table of liquid crystal indicator according to claim 1, it is characterized in that: the GTG value of wherein " those initially being overdrived deducts those specific grey-scale values of this present picture frame data " step comprise:
Those GTG values of initially overdriving of i row are deducted i specific grey-scale value of this present picture frame data, and wherein i is a positive integer.
5. the production method of the over-driving look-up table of liquid crystal indicator according to claim 1 is characterized in that: wherein " numerical value in those blocks to be encoded is encoded, obtain those encoded block with correspondence " step comprise:
Maximal value in each block to be encoded is set at a maximal value identification code;
Minimum value in each block to be encoded is set at a minimum value identification code;
This maximal value in each block to be encoded is deducted the numerical value of this minimum value, and be set at a difference identification code according to this; And
This a difference identification code and a reference value in each block to be encoded are compared, and be set at a pattern-recognition sign indicating number according to this.
6. the production method of the over-driving look-up table of liquid crystal indicator according to claim 5 is characterized in that: wherein " numerical value in those blocks to be encoded is encoded, obtain those encoded block with correspondence " step more comprise:
In each block to be encoded, when this difference identification code during smaller or equal to this reference value, this pattern-recognition sign indicating number is 0; And
In each block to be encoded, when this difference identification code during greater than this reference value, this pattern-recognition sign indicating number is 1.
7. the production method of the over-driving look-up table of liquid crystal indicator according to claim 6 wherein " is encoded to the numerical value in those blocks to be encoded, obtains those encoded block with correspondence " step more comprise:
In each block to be encoded, when this pattern-recognition sign indicating number is 0, the numerical value in this block to be encoded is deducted this minimum value identification code respectively, so obtain those encoded radios in the corresponding encoded block; And
In each block to be encoded, when this pattern-recognition sign indicating number is 1, the numerical value in this block to be encoded is deducted this minimum value identification code respectively afterwards again divided by 2, so obtain those encoded radios in the corresponding encoded block.
8. the production method of the over-driving look-up table of liquid crystal indicator according to claim 6 is characterized in that: wherein " numerical value in those blocks to be encoded is encoded, obtain those encoded block with correspondence " step more comprise:
In each block to be encoded, when this pattern-recognition sign indicating number is 0, the numerical value in this block to be encoded is deducted this minimum value identification code respectively, so obtain those encoded radios in the corresponding encoded block; And
In each block to be encoded, when this pattern-recognition sign indicating number is 1, the numerical value in this block to be encoded is deducted this minimum value identification code respectively carry out an integer computing again divided by 2 earlier afterwards, so obtain those encoded radios in the corresponding encoded block; The method of wherein carrying out described integer computing comprises unconditionally to be cast out.
9. the production method of the over-driving look-up table of liquid crystal indicator according to claim 7 is characterized in that: more comprise:
Those encoded radios are deciphered.
10. the production method of the over-driving look-up table of liquid crystal indicator according to claim 9 is characterized in that: wherein " those encoded radios are deciphered " step comprise:
At each in the encoded block, when this pattern-recognition sign indicating number is 0, with this those encoded radios in the encoded block add this minimum value identification code; And
At each in the encoded block, when this pattern-recognition sign indicating number is 1, with this numerical value that multiply by after 2 of those encoded radios in the encoded block add this minimum value identification code more respectively.
11. the generator of the over-driving look-up table of a liquid crystal indicator, it is characterized in that: described liquid crystal indicator has in order to store an initial over-driving look-up table of a plurality of GTG values of initially overdriving, and wherein the generator of the over-driving look-up table of this liquid crystal indicator comprises:
One absolute difference arithmetic element, a plurality of specific grey-scale values that those GTG values of initially overdriving deducted a present picture frame data take absolute value afterwards again, to obtain an absolute difference over-driving look-up table; And
One block coding unit, couple this absolute difference arithmetic element, wherein this block coding unit is according to a specific grey-scale range, so that this absolute difference over-driving look-up table is divided into a plurality of blocks to be encoded, and the numerical value in those blocks to be encoded is encoded, obtain a plurality of encoded block with correspondence, so obtain to have those target over-driving look-up tables of encoded block
Wherein, those encoded block have a plurality of encoded radios respectively, and the total bit of stored those encoded radios of this target over-driving look-up table is less than the total bit of those GTG values of initially overdriving.
12. the generator of the over-driving look-up table of liquid crystal indicator according to claim 11 is characterized in that: the corresponding relation of a plurality of specific grey-scale values of a drawing frame data on those specific grey-scale values and one of those these present picture frame data of GTG value representation of initially overdriving wherein.
13. the generator of the over-driving look-up table of liquid crystal indicator according to claim 11, it is characterized in that: wherein the number of a plurality of specific grey-scale values of a drawing frame data is all N on those specific grey-scale values and one of this present drawing frame data, so the number of those GTG values of initially overdriving is squares 16. generators as the over-driving look-up table of liquid crystal indicator as described in the 15th of the claim of N; Wherein the number of those blocks to be encoded be N square the factor.
14. the generator of the over-driving look-up table of liquid crystal indicator according to claim 11, it is characterized in that: wherein the action that those GTG values of initially overdriving are deducted those specific grey-scale values of this present picture frame data of this absolute difference arithmetic element is to take this absolute difference arithmetic element that those GTG values of initially overdriving of i row are deducted i specific grey-scale value of this present picture frame data, and i is a positive integer.
15. the generator of the over-driving look-up table of liquid crystal indicator according to claim 11, it is characterized in that: wherein this block coding unit is set at a maximal value identification code with the maximal value in each block to be encoded, again the minimum value in each block to be encoded is set at a minimum value identification code, the setting value that also this maximal value in each block to be encoded is deducted this minimum value is a difference identification code, and the comparative result after also this difference identification code in each block to be encoded and a reference value being compared is set at a pattern-recognition sign indicating number.
16. the generator of the over-driving look-up table of liquid crystal indicator according to claim 15, it is characterized in that: when wherein this block coding unit judges goes out this difference identification code in each block to be encoded smaller or equal to this reference value, this pattern-recognition sign indicating number that this block coding unit is produced is 0, and when this block coding unit judges went out this difference identification code in each block to be encoded greater than this reference value, this pattern-recognition sign indicating number that this block coding unit is produced was 1.
17. the generator of the over-driving look-up table of liquid crystal indicator according to claim 16, it is characterized in that: wherein in each block to be encoded, when this pattern-recognition sign indicating number is 0, the numerical value of this block coding unit in more will this block to be encoded deducts this minimum value identification code respectively, to obtain those encoded radios in the corresponding encoded block, when this pattern-recognition sign indicating number is 1, the numerical value of this block coding unit in more will this block to be encoded deducts respectively after this minimum value identification code again divided by 2, to obtain those encoded radios in the corresponding encoded block.
18. the generator of the over-driving look-up table of liquid crystal indicator according to claim 16, it is characterized in that: wherein in each block to be encoded, when this pattern-recognition sign indicating number is 0, the numerical value of this block coding unit in more will this block to be encoded deducts this minimum value identification code respectively, to obtain those encoded radios in the corresponding encoded block, when this pattern-recognition sign indicating number is 1, the numerical value of this block coding unit in more will this block to be encoded carries out an integer computing divided by 2 earlier after deducting this minimum value identification code respectively again, to obtain those encoded radios in the corresponding encoded block; Wherein,
The method of carrying out described integer computing comprises unconditionally to be cast out.
19. the generator of the over-driving look-up table of liquid crystal indicator according to claim 17 is characterized in that: more comprise:
One block decoding unit couples this block coding unit, and wherein this block decoding unit is deciphered those encoded radios.
20. the generator of the over-driving look-up table of liquid crystal indicator according to claim 19, it is characterized in that: wherein at each in the encoded block, this block decoding unit judges that this pattern-recognition sign indicating number is at 0 o'clock, this block decoding unit with this those encoded radios in the encoded block add this minimum value identification code, this block decoding unit judges that this pattern-recognition sign indicating number is at 1 o'clock, this block decoding unit with this numerical value that multiply by after 2 of those encoded radios in the encoded block add this minimum value identification code more respectively.
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