TWI413082B - Generator and generating method thereof for overdrive table of liquid crystal display apparatus - Google Patents

Abstract

A generator and a generating method thereof for an overdrive table of a liquid crystal display apparatus are provided. The generating method includes the following the descriptions. Firstly, respectively subtract specific gray-level values of a present frame data from original overdrive gray-level values of an original overdrive lookup table, and then calculate an absolute so that an absolute difference overdrive table is obtained. Afterwards, the absolute difference overdrive table is divided into standby code blocks according to a specific gray-level region. Next, values of the standby code blocks are encoded to correspondingly obtain coded blocks, such that a target overdrive lookup table having the coded blocks is obtained. The coded blocks respectively have coding values, and total bit counts of the coding values stored in the target overdrive lookup table is less than total bit counts of the original overdrive gray-level values.

Description

Generator for overdrive lookup table of liquid crystal display device and its generator law

The present invention relates to a generator for a look-up table of a display device and a method for producing the same, and more particularly to a generator for an overdrive look-up table of a liquid crystal display device and a method for generating the same.

Among many flat panel displays, liquid crystal displays (LCDs) have become the mainstream of today's market due to their many advantages. However, the liquid crystal display device has a problem that the display is poor due to the inconsistent reaction speed of the liquid crystal molecules. In order to increase the reaction speed of liquid crystal molecules, an overdrive (OD) technique has been proposed. This technology improves the reaction speed of liquid crystal molecules by providing an overdrive voltage higher than the general driving voltage through an overdrive circuit, so that the display screen achieves the desired brightness. In practice, the overdrive voltage can be transmitted to an overdrive table (OD table) by performing image data (for example, grayscale data) of two adjacent frames to perform a table lookup operation, and based on the result of the lookup table. Insert the operation to get.

Specifically, a block diagram of a conventional overdrive circuit as illustrated in FIG. 1A. The overdrive circuit 100 includes a sorter 110, a plurality of overdrive lookup tables 102a, 102b, 102c, 102d and an interpolation unit 120, wherein the overdrive lookup tables 102a, 102b, 102c, 102d are coupled Between the sequencer 110 and the interpolation unit 120.

In general, it provides a liquid crystal display with a grayscale value of 0~255. For the display device, the overdrive lookup tables 102a, 102b, 102c, 102d typically take the appearance of the overdrive lookup table 102 as depicted in FIG. 1B. The 16 specific grayscale values of the current frame data and the 16 specific grayscale values of the previous frame data correspond to 256 overdrive grayscale values, and the 16 specific grayscale values are respectively 0. 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, and 240.

Referring to FIG. 1A and FIG. 1B simultaneously, first, the sequencer 110 receives the picture data F _n-1 and F _n (for example, gray scale data) of both the previous frame data and the current frame data, and classifies them. The Most Significant Byte (MSB) data of the previous frame data F _{n-1, MSB} , the highest byte data of the current frame data F _{n, MSB} , the previous frame data A Least Significant Byte (LSB) data F _{n-1, LSB} and a minimum byte data of the current frame data F _{n, LSB} four data.

Then, the highest byte data F _{n-1, MSB} and F _{n, MSB} of the previous frame data and the current frame data are transferred to the overdrive lookup tables 102a, 102b, 102c, 102d to Perform the action of checking the table. Thereafter, the data output by the overdrive lookup tables 102a, 102b, 102c, 102d is transferred to the interpolation unit 120, and the interpolation unit 120 can perform an interpolation operation to obtain the interpolation processed overdrive grayscale values.

As can be seen from FIG. 1B, the maximum of these overdrive grayscale values is 250, which occupies an 8-bit storage space. However, there are a total of 256 overdrive grayscale values in the overdrive lookup table 102, so overdrive technology must provide a significant amount of storage space at a very high cost.

The invention provides a generator for an overdrive lookup table of a liquid crystal display device and a method for generating the same, which generate an overdrive lookup table occupying less storage space.

The present invention provides a method for generating an overdrive lookup table (OD table) of a liquid crystal display device, wherein the liquid crystal display device has an initial overdrive lookup table for storing a plurality of initial overdrive gray scale values, and the liquid crystal display of the present invention The method of generating the overdrive lookup table of the device includes the following steps. First, the initial overdrive grayscale value is subtracted from the value of a plurality of specific grayscale values of the current frame data and then the absolute value is taken to obtain an absolute difference overdrive lookup table. Then, the absolute difference overdrive lookup table is divided into a plurality of blocks to be coded according to a specific gray scale range. Thereafter, the values in the coded block are encoded to correspondingly obtain a plurality of coded blocks, thus obtaining a target overdrive lookup table having the coded blocks. The coded blocks each have a plurality of coded values, and the total number of bits of the coded value stored in the target overdrive lookup table is less than the total number of bits of the initial overdrive grayscale value.

The present invention further provides a generator for an overdrive lookup table of a liquid crystal display device, wherein the liquid crystal display device has an initial overdrive lookup table for storing a plurality of initial overdrive grayscale values. The generator of the overdrive lookup table of the liquid crystal display device of the present invention comprises an absolute difference operation unit and a block coding unit, wherein the block coding unit is coupled to the absolute difference operation unit. The absolute difference operation unit subtracts the value of the initial overdrive grayscale value from a plurality of specific grayscale values of the current frame data and then takes the absolute value to obtain a absolute value. Over-drive lookup table for difference. The block coding unit divides the absolute difference overdrive lookup table into a plurality of blocks to be coded according to a specific gray scale range, and encodes the values in the code block to obtain a plurality of coded blocks. A target overdrive lookup table with these coded blocks is thus obtained. In addition, the coded blocks respectively have a plurality of coded values, and the total number of bits of the coded values stored in the target overdrive lookup table is less than the total number of bits of the initial overdrive grayscale value.

In an embodiment of the method and generator for generating an overdrive lookup table of the liquid crystal display device of the present invention, the initial overdrive grayscale value indicates a specific grayscale value of the current frame data and a plurality of previous frame data. The correspondence of specific grayscale values.

In an embodiment of the method and generator for generating an overdrive lookup table of the liquid crystal display device of the present invention, a specific grayscale value of the current frame material and a plurality of specific grayscale values of a previous frame data are used. The number is N, so the number of initial overdrive grayscale values is the square of N. In an embodiment, the number of blocks to be coded is a factor of the square of N.

Example display apparatus method for generating overdrive lookup table generator with the present invention is a liquid crystal, the initial step of subtracting the overdrive grayscale value of the grayscale values specified current frame of information comprising: the i-th row The initial overdrive grayscale value minus the ith specific grayscale value of the current frame data, where i is a positive integer.

In an embodiment of the method and generator for generating an overdrive lookup table of the liquid crystal display device of the present invention, the block coding unit sets a maximum value in each block to be encoded as a maximum value identification code, and Each to be coded A minimum value in the block is set to a minimum value identification code, and the maximum value in each block to be coded is subtracted from the value of the minimum value to be set as a difference identification code, and each code is to be encoded. The difference identification code in the block is compared with a reference value to be set as a pattern identification code. In an embodiment, when the block coding unit further determines that the difference identification code in each block to be coded is less than or equal to the reference value, the mode identification code generated by the block coding unit is 0; and the block coding unit further When it is determined that the difference identification code in each block to be coded is greater than the reference value, the pattern identification code generated by the block coding unit is 1.

In an embodiment of the method and the generator for generating an overdrive lookup table of the liquid crystal display device of the present invention, in each block to be coded, when the mode identification code is 0, the block coding unit is further to be coded. The values in the block are respectively subtracted from the minimum value identification code to obtain the coded values in the corresponding coded block. On the other hand, in each block to be coded, when the mode identification code is 1, the block coding unit further subtracts the value after the minimum value identification code from the value in the block to be coded, and divides by 2 to obtain a corresponding value. The encoded value in the coded block. In an embodiment, in each block to be encoded, when the mode identification code is 0, the block coding unit further subtracts the minimum value identification code from the value in the block to be coded to obtain the corresponding coded code. The encoded value in the block. On the other hand, in each block to be coded, when the mode identification code is 1, the block coding unit further subtracts the minimum value identification code from the value in the block to be coded, and then divides by 2 to perform an integer operation. To obtain the encoded value in the corresponding coded block. In an embodiment, the method in which the block coding unit performs the integer operation may be unconditionally rounded off.

Producer of overdrive lookup table of liquid crystal display device of the present invention In an embodiment of the method and the generator, the generator of the overdrive lookup table of the liquid crystal display device further includes a block decoding unit. The block decoding unit is coupled to the block coding unit, and the block decoding unit further decodes the coded value. In an embodiment, in each coded block, when the block decoding unit determines that the mode identification code is 0, the block decoding unit adds the minimum value identification code to each coded value in the coded block; In each coded block, when the block decoding unit determines that the mode identification code is 1, the block decoding unit multiplies the respective code values in the coded block by the value after 2 and adds the minimum value identification code, respectively.

Based on the above, the generator of the overdrive lookup table of the liquid crystal display device of the present invention and the method for generating the same can encode the initial overdrive grayscale value in the initial overdrive lookup table to generate a target overdrive lookup with less storage space. table.

The above described features and advantages of the present invention will be more apparent from the following description.

2 is a block diagram showing a generator of an overdrive lookup table of a liquid crystal display device according to an embodiment of the present invention. Referring to FIG. 2, the generator 210 of the overdrive lookup table of the liquid crystal display device (not shown) of the present embodiment includes an absolute difference operation unit 212 and a block coding unit 214, wherein the block coding unit 214 is coupled. Absolute difference operation unit 212.

In this embodiment, the generator 210 that overdrives the lookup table can store a plurality of initial overdrives stored in an initial overdrive lookup table (OD table). The grayscale values are computed to produce a target overdrive lookup table 202 with fewer bits. For convenience of description, the present embodiment assumes that the gray scale resolution of the liquid crystal display device is 8 bits, that is, the liquid crystal display device displays the image with a gray scale of 0 to 255, and assumes that the initial overdrive lookup table of the embodiment is used, for example. The overdrive lookup table 102 is illustrated in FIG. 1B, that is, the correspondence between the specific grayscale values of the current frame data and the previous frame data in the prior art is used as the initial overdrive grayscale value. . Furthermore, the current frame data and the previous frame data of the embodiment have 16 specific grayscale values (for example, 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, and 240), and thus the number of initial overdrive grayscale values corresponding to is 256 (i.e., the square of 16).

It is to be noted that the above-mentioned set values are not intended to limit the present invention, and the user may change it according to actual needs. Next, the generator of the overdrive lookup table of the present embodiment and the method of generating the same are exemplified, but the present invention is not limited to the following description of all the embodiments of the present invention.

First embodiment

In the present embodiment, the absolute difference operation unit 212 first operates on the initial overdrive grayscale value in the initial overdrive lookup table (eg, the overdrive lookup table 102 of FIG. 1B), and further initializes the initial overdrive lookup table. Converted to an absolute difference overdrive lookup table.

Specifically, the absolute difference operation unit 212 subtracts the initial overdrive grayscale value from the specific grayscale value of the current frame data, wherein the embodiment uses the initial overdrive grayscale value of the i-th column minus the current frame. The action is achieved by the way of the i- th specific grayscale value of the data, i being a positive integer. That is, as shown in FIG. 1B, the first column initial overdrive grayscale values (eg, both are 0) minus the specific grayscale values of the first column (eg, 0), and the second column initial overdrive grayscale Values (eg, 18, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, and 16) are subtracted from the specific grayscale value of the second column (for example, 16) And the third column of initial overdrive grayscale values (eg, 34, 34, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 30, and 26) minus the third column The specific grayscale value (for example, 32), and so on, the numerical operations of the remaining columns. In this way, a difference overdrive lookup table 302 as illustrated in FIG. 3A can be obtained.

In view of the above, since the value on the diagonal line in FIG. 1B is the same as the specific gray scale value of the current frame data, the gray scale values on the diagonal line in FIG. 3A are both zero. Further, in FIG. 3A, the right side of the value on the diagonal has a negative number, and the left side of the value on the diagonal line is a positive number. This embodiment further takes the absolute value of the value in the difference overdrive lookup table 302 of FIG. 3A to obtain the absolute difference overdrive lookup table 304 illustrated in FIG. 3B. In short, the absolute difference overdrive lookup table 304 stores values greater than or equal to zero.

Next, the block coding unit 214 divides the absolute difference overdrive lookup table 304 of FIG. 3B into a plurality of blocks to be coded, for example, 16 blocks to be coded A, B, C, D, as illustrated in FIG. 3C. E, F, G, H, I, J, K, L, M, N, O, and P. In this embodiment, the block coding unit 214 divides the to-be-coded blocks A to P according to a specific gray-scale range, for example, the specific gray-scale range is, for example, 16 specific gray-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, equally divided into [0, 16, 32, 48], [64, 80, 96 , 112], [128, 144, 160, 176] and [192, 208, 224, 240] four parts.

It should be noted that the number of blocks A to P to be coded in the embodiment (ie, 16) is just the factor of the number of initial overdrive grayscale values (ie, 256), and thus each block to be coded A ~P has the same number of values, but the invention is not limited thereto. That is to say, the present invention does not limit the above division manner to a unique division manner, and the actual division manner should be determined according to the needs of the product.

In this embodiment, the existence of the blocks to be coded A to P can be used to generate the coded block in the subsequent step (detailed later), wherein the coded value in the coded block (detailed later) can be The block coding unit 214 codes the values in the code blocks A to P, respectively.

In detail, the block encoding unit 214 sets a maximum value of each of the blocks A to P to be encoded as a maximum value identification code. In other words, according to the maximum values of the blocks A, B, C, D, E, F, G, H, I, J, K, L, M, N, O and P to be coded, respectively, the corresponding settings can be made. The maximum value identification codes are 8, 35, 49, 44, 2, 10, 49, 34, 6, 16, 17, 32, 14, 47, 59 and 56.

On the other hand, the block coding unit 214 can further set a minimum value of each of the blocks A to P to be encoded as a minimum value identification code. That is, according to the minimum values of the blocks A, B, C, D, E, F, G, H, I, J, K, L, M, N, O and P to be coded, respectively, the minimum setting can be correspondingly set. Value recognition The codes are 0, 2, 23, 10, 0, 0, 5, 10, 0, 3, 0, 8, 0, 12, 10 and 0.

In addition to this, the block coding unit 214 may further set the value of the maximum value in each block to be coded to the minimum value as a difference identification code. In other words, the difference between the minimum values of the blocks A, B, C, D, E, F, G, H, I, J, K, L, M, N, O and P is subtracted from the maximum value, The difference identification codes can be set to 8, 33, 26, 34, 2, 10, 44, 24, 6, 13, 17, 24, 14, 35, 49 and 56.

In addition, in each block to be coded, the block coding unit 214 may further compare the difference identification code with a reference value, and set a pattern identification code according to the comparison result. More specifically, the present embodiment assumes that the reference value is 31, and assumes that the comparison result of the difference identification code and the reference value 31 is: when the block coding unit 214 determines that the difference identification code is larger than the reference value 31, the block coding The mode value identification code generated by the unit 214 is 1; otherwise, when the block coding unit 214 determines that the difference identification code is less than or equal to the reference value 31, the mode value identification code generated by the block coding unit 214 is 0. Therefore, after comparing the difference identification codes 8, 33, 26, 34, 2, 10, 44, 24, 6, 13, 17, 24, 14, 35, 49, and 56 with the reference value 31, respectively, The mode value identification codes are 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, and 1.

Based on the above, the maximum value identification code, the minimum value identification code, the difference identification code, and the pattern identification code of the present embodiment have been substantially set, as shown in FIG. 3D.

Please refer to FIG. 3C and FIG. 3D simultaneously, and the mode identification code is 0. For the coding blocks A, C, E, F, H, I, J, K, L and M, the block coding unit 214 performs coding in the following manner: the blocks to be coded A, C, E, F, H The values in I, J, K, L, and M are respectively subtracted from their corresponding minimum identification codes 0, 23, 0, 0, 10, 0, 3, 0, 8, and 0 to obtain the corresponding encoded code. Each encoded value in the block.

Taking the block A to be coded as an example, the block coding unit 214 will calculate the value in the block A to be coded. After subtracting the minimum value identification code 0, the code value in the coded block α can be obtained. As shown in Figure 3E. In this way, the encoding method of the blocks C, E, F, H, I, J, K, L, and M to be coded with the remaining pattern identification code 0 can be analogized, and will not be described here.

On the other hand, referring to FIG. 3C and FIG. 3D, for the blocks B, D, G, N, O and P to be coded with the pattern identifier of 1, the block coding unit 214 performs encoding as follows: The values in the blocks B, D, G, N, O, and P to be coded are respectively subtracted from the corresponding minimum value identification codes 2, 10, 5, 12, 10, and 0, and then divided by 2 to obtain a correspondence. Each encoded value in the coded block.

Taking the block B to be coded as an example, the block coding unit 214 will calculate the value in the block B to be coded. After subtracting the minimum identification code 2, you can get it first. Then, after dividing these values by 2, the encoded value in the encoded block β can be obtained. As shown in Figure 3F. It is particularly mentioned here that this embodiment uses an integer operation of the unconditional rounding method to perform the above division operation. Therefore, when the remaining blocks D, G, N, O and P with the pattern identifier of 1 are encoded, if the value after the division is not an integer, the integer is also unconditionally rounded off. However, the present invention is not limited thereto, and in actual application, it is also possible to perform coding using rounding, unconditional entry, or other integerization.

In this way, the target overdrive lookup table 202 (shown in FIG. 2) composed of the above 16 coded blocks (eg, α, β, etc.) can be obtained. So far, the generation method of the overdrive lookup table of the present embodiment has been substantially completed.

With continued reference to FIG. 2, the target overdrive lookup table 202 is typically stored in memory. In this embodiment, the number of bits required to store any one of the coded blocks (eg, α or β) is: store an encoded value in 5 bits, There are 16 coded values in one of the coded blocks, and the minimum value identification code is stored in 8 bits, and the pattern identification code is stored in 1 bit. Thus, it can be calculated that only one 89 (i.e., 5 x 16 + 8 + 1 = 89) bits of storage space is required for an encoded block (e.g., alpha or beta).

However, compared to the initial overdrive lookup table before the encoding (ie, the overdrive lookup table 102 of FIG. 1B disclosed in the prior art), each of the initial overdrive grayscale values occupies an 8-bit storage space, thus 16 The initial overdrive grayscale values occupy a total of 128 bits of storage space. Therefore, the total number of bits of the coded value stored in the target overdrive lookup table 202 of the embodiment may be less than the total number of bits of the initial overdrive grayscale value, so that the storage space occupied by the embodiment is small. . This reduces the size of the overdrive circuit and reduces the cost.

In the application of the actual product, a block decoding unit 216 coupled to the block coding unit 214 may also be disposed in the generator 210 of the overdrive lookup table to further encode the coded blocks (eg, α, β, etc.). The stored data is decoded as shown in Figure 2.

In detail, the block decoding unit 216 can obtain 16 code values, a minimum value identification code, and a pattern identification code stored in each coded block (eg, α, β, etc.) from the target overdrive lookup table 202 to The action of decoding. In this embodiment, if the block decoding unit 216 determines that the mode identification code of the coded block (e.g., α) is 0, the decoding method is performed by the block decoding unit 216 in the coded block (e.g., α). 16 code values plus the minimum value identification code; conversely, if the block decoding unit 216 determines that the mode identification code of the coded block (e.g., β) is 1, the decoding method is to use the block decoding unit 216 to use the coded area. 16 in a block (eg β) The code values are respectively multiplied by the value after 2 and then added to the minimum value identification code.

Based on the above concept, the generator 210 of the overdrive lookup table of the present embodiment can be applied to the overdrive circuit 400 as illustrated in FIG. In other words, the overdrive circuit 400 of the present implementation includes a sorter 410, a plurality of target overdrive lookup tables 402a, 402b, 402c, 402d, a block decoding unit 416, and an interpolation unit 420. The sequencer 410 is coupled to the target overdrive lookup table 402a, 402b, 402c, 402d, and the block decode unit 416 is coupled between the overdrive lookup tables 402a, 402b, 402c, 402d and the interpolation unit 420.

In the above, the sequencer 410 receives the picture data F _n-1 and F _n (for example, gray scale data) of the previous frame data and the current frame data, and classifies the highest bit of the previous frame data. Group data F _{n-1, MSB} , Most Significant Byte (MSB) data of the current frame data F _{n, MSB} , Least Significant Byte (LSB) data of the previous frame data F _{n-1, LSB} and the lowest byte data of the current frame data F _{n, LSB} four data. Then, in this embodiment, the highest byte data F _{n-1, MSB} and F _{n, MSB} of the previous frame data and the current frame data are transmitted to the target overdrive lookup tables 402a, 402b, 402c, 402d. In order to perform the table lookup operation; on the other hand, the two pieces of F _{n-1, LSB} and F _{n, LSB} data are transferred to the interpolation unit 420 for interpolation. Then, the block decoding unit 416 can obtain the corresponding coded value, the minimum value identification code, and the mode identification code from the target overdrive lookup table 402a, 402b, 402c, and 402d, respectively, to perform the decoding operation. Thereafter, the data output by the block decoding unit 416 is transferred to the interpolation unit 420, so that the interpolation unit 420 performs an interpolation operation to obtain an overdrive gray scale value subjected to the interpolation processing.

However, the decoding operation performed by the block decoding unit 416 can refer to the decoding action of the block decoding unit 216, and the interpolation operation performed by the interpolation unit 420 is not the technical focus of the embodiment, and thus is not added here. Narration.

Second embodiment

The description of the first embodiment is further provided. The present invention further provides a method for generating an overdrive lookup table of a liquid crystal display device, such as a flow chart of a method for generating an overdrive lookup table of the liquid crystal display device shown in FIG. 5. The liquid crystal display device (not shown) of the embodiment has an initial overdrive lookup table for storing a plurality of initial overdrive grayscale values.

Referring to FIG. 5, first, in step S501, the initial overdrive grayscale value is subtracted from the value after the specific grayscale value of the current frame data, and then the absolute value is taken to obtain an absolute difference overdrive lookup table.

Then, in step S503, the absolute difference overdrive lookup table is divided into a plurality of blocks to be coded according to a specific grayscale range.

Thereafter, in step S505, the values in the block to be encoded are encoded to correspondingly obtain a plurality of coded blocks, and further obtain a target overdrive lookup table having the coded blocks, wherein the coded blocks are There are multiple encoded values respectively. In this embodiment, the total number of bits of the encoded value stored in the target overdrive lookup table is less than the total number of bits of the initial overdrive grayscale value.

The remaining details and advantages of the method of generating the overdrive lookup table of the liquid crystal display device of the present embodiment are included in the above-described first embodiment. Therefore, it is not mentioned here.

In summary, the generator of the overdrive look-up table of the liquid crystal display device of the present invention and the method for generating the same can greatly improve the situation in which the conventional technology requires a large amount of storage space, thereby reducing the layout size and reduction of the overdrive circuit. Product Cost.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100, 400‧‧‧ overdrive circuit

102, 102a, 102b, 102c, 102d‧‧‧Overdrive lookup table

110,410‧‧‧Sequencer

120, 420‧‧‧Interpolation unit

202, 402a, 402b, 402c, 402d‧‧‧ target overdrive lookup table

210‧‧‧Overdriver lookup table generator

212‧‧‧Absolute difference arithmetic unit

214‧‧‧block coding unit

216, 416‧‧‧block decoding unit

302‧‧‧Difference overdrive lookup table

304‧‧‧Absolute difference overdrive lookup table

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P‧‧‧ blocks to be coded

F _n-1 , F _n , F _{n-1, MSB} , F _{n, MSB} , F _{n-1, LSB} , F _{n, LSB} ‧‧‧ Picture data

S501, S503, S505‧‧‧ steps

、, β‧‧‧ coded blocks

FIG. 1A is a block diagram showing a conventional overdrive circuit.

FIG. 1B illustrates a conventional overdrive lookup table.

2 is a block diagram showing a generator of an overdrive lookup table of a liquid crystal display device according to an embodiment of the present invention.

3A illustrates a differential overdrive lookup table in accordance with an embodiment of the present invention.

FIG. 3B illustrates an absolute difference overdrive lookup table in accordance with an embodiment of the present invention.

FIG. 3C illustrates an absolute difference overdrive lookup table divided into a plurality of blocks to be coded according to an embodiment of the present invention.

FIG. 3D illustrates a maximum value identification code, a minimum value identification code, a difference identification code, and a pattern identification code in each block to be encoded according to an embodiment of the present invention.

FIG. 3E is a diagram showing relationship between a block to be encoded and an encoded block in a mode identification code according to an embodiment of the present invention.

FIG. 3F is a diagram showing relationship between a block to be encoded and an encoded block under another mode identification code according to an embodiment of the present invention.

4 is a block diagram of an overdrive circuit in accordance with an embodiment of the present invention.

FIG. 5 is a flow chart showing a method for generating an overdrive lookup table of a liquid crystal display device according to an embodiment of the present invention.

S501, S503, S505‧‧‧ steps

Claims (24)

A method for generating an overdrive lookup table of a liquid crystal display device, the liquid crystal display device having an initial overdrive lookup table for storing a plurality of initial overdrive gray scale values, wherein the method for generating an overdrive lookup table of the liquid crystal display device The method includes: subtracting the initial overdrive grayscale values from a plurality of specific grayscale values of the current frame data and then taking the absolute values to obtain an absolute difference overdrive lookup table; according to a specific grayscale range, The absolute difference overdrive lookup table is divided into a plurality of blocks to be coded; and the values in the blocks to be coded are coded to obtain a plurality of coded blocks correspondingly, thus obtaining the coded blocks a target overdrive lookup table, wherein the coded blocks respectively have a plurality of coded values, and the total number of bits of the coded values stored in the target overdrive lookup table is less than the initial overdrive grayscales The total number of bits of the value. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 1, wherein the initial overdrive grayscale values represent the specific grayscale values of the current frame data and a previous image. The correspondence between multiple specific grayscale values of the frame data. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 1, wherein the specific grayscale values of the current frame material and the plurality of specific grayscale values of a previous frame data are used. The number of each is N, such that the number of initial overdrive grayscale values is the square of N, where N is a positive integer greater than 2 or equal to 2. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 3, wherein the number of the blocks to be coded is a factor of a square of N. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 1, wherein the step of "subtracting the initial overdrive grayscale values from the specific grayscale values of the current frame data" The method includes: subtracting the initial overdrive grayscale values of the i-th column from the i- th specific grayscale value of the current frame data, where i is a positive integer. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 1, wherein the step of: encoding the values in the blocks to be coded to correspondingly obtain the coded blocks includes : setting a maximum value in each block to be coded as a maximum value identification code; setting a minimum value in each block to be coded as a minimum value identification code; The maximum value is subtracted from the value of the minimum value, and is set as a difference identification code; and the difference identification code in each block to be coded is compared with a reference value, and is set as one Pattern ID. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 6, wherein the step of "encoding the values in the blocks to be coded to obtain the coded blocks" is further The method includes: in each block to be coded, when the difference identifier is less than or equal to the reference value, the pattern identifier is 0; In each block to be coded, when the difference identification code is greater than the reference value, the pattern identification code is 1. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 7, wherein the step of "encoding the values in the blocks to be encoded to obtain the coded blocks" is further The method includes: in each block to be coded, when the pattern identifier is 0, subtracting the minimum value identification code from the value in the block to be encoded, so as to obtain the corresponding coded blocks Encoding value; and in each block to be encoded, when the mode identification code is 1, the value in the block to be encoded is respectively subtracted from the minimum value identification code and then divided by 2, thus obtaining the corresponding Encoding the encoded values in the block. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 7, wherein the step of "encoding the values in the blocks to be encoded to obtain the coded blocks" is further The method includes: in each block to be coded, when the pattern identifier is 0, subtracting the minimum value identification code from the value in the block to be encoded, so as to obtain the corresponding coded blocks Encoding value; and in each block to be encoded, when the mode identification code is 1, the value in the block to be encoded is respectively subtracted from the minimum value identification code, and then divided by 2 and then an integer operation is performed. The encoded values in the corresponding coded blocks are thus obtained. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 9, wherein the method of performing the integer conversion operation includes unconditionally dropping. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 8, further comprising: decoding the encoded values. The method for generating an overdrive lookup table of a liquid crystal display device according to claim 11, wherein the step of: decoding the encoded values comprises: in each coded block, when the pattern identifier When 0, the code values in the coded block are added to the minimum value identification code; and in each coded block, when the pattern identification code is 1, the coded block is The code values are multiplied by the value after 2 and the minimum value identification code is added separately. A generator for an overdrive lookup table of a liquid crystal display device, the liquid crystal display device having an initial overdrive lookup table for storing a plurality of initial overdrive gray scale values, wherein the generator of the overdrive lookup table of the liquid crystal display device The method includes: an absolute difference operation unit, which subtracts a plurality of specific grayscale values of the current frame data from the initial overdrive grayscale values, and then takes an absolute value to obtain an absolute difference overdrive lookup table; a block coding unit coupled to the absolute difference operation unit, wherein the block coding unit divides the absolute difference overdrive lookup table into a plurality of blocks to be coded according to a specific gray level range, and The values in the blocks to be coded are encoded to obtain a plurality of coded blocks correspondingly, so that a target overdrive lookup table having the coded blocks is obtained, wherein the coded blocks have multiple Coded value, and the item The total number of bits of the coded values stored in the drive lookup table is less than the total number of bits of the initial overdrive grayscale values. The generator of the overdrive lookup table of the liquid crystal display device of claim 13, wherein the initial overdrive grayscale values represent the specific grayscale values of the current frame data and a previous image. The correspondence between multiple specific grayscale values of the frame data. The generator of the overdrive lookup table of the liquid crystal display device of claim 13, wherein the specific grayscale values of the current frame data and the plurality of specific grayscale values of a previous frame data. The number of each is N, such that the number of initial overdrive grayscale values is the square of N, where N is a positive integer greater than 2 or equal to 2. The generator of the overdrive lookup table of the liquid crystal display device of claim 15, wherein the number of the blocks to be coded is a factor of a square of N. The generator of the overdrive lookup table of the liquid crystal display device of claim 13, wherein the absolute difference operation unit subtracts the initial overdrive grayscale values from the specific gray of the current frame data. The action of the order value is that the absolute difference operation unit subtracts the initial overdrive gray scale values of the i-th column from the i- th specific gray scale value of the current frame data, where i is a positive integer. The generator of the overdrive lookup table of the liquid crystal display device of claim 13, wherein the block coding unit sets a maximum value in each block to be coded as a maximum value, and A minimum value in each block to be coded is set to a minimum value identification code, and each will be The value of the maximum value in the coding block minus the minimum value is set as a difference identification code, and the comparison result after comparing the difference identification code in each block to be coded with a reference value is set as A pattern identifier. The generator of the overdrive lookup table of the liquid crystal display device of claim 18, wherein the block coding unit determines that the difference identification code in each block to be coded is less than or equal to the reference value, The mode identification code generated by the block coding unit is 0, and the block coding unit determines that the difference identification code in each block to be coded is greater than the reference value, and the block coding unit generates The pattern ID is 1. The generator of the overdrive lookup table of the liquid crystal display device of claim 19, wherein in each block to be coded, when the mode identification code is 0, the block coding unit further treats the block coding unit The value in the coding block is respectively subtracted from the minimum value identification code to obtain the coded values in the corresponding coded block. When the mode identification code is 1, the block coding unit further encodes the to-be-coded area. The values in the block are respectively subtracted from the minimum value identification code and then divided by 2 to obtain the encoded values in the corresponding coded block. The generator of the overdrive lookup table of the liquid crystal display device of claim 19, wherein in each block to be coded, when the mode identification code is 0, the block coding unit further treats the block coding unit The value in the coding block is respectively subtracted from the minimum value identification code to obtain the coded values in the corresponding coded block. When the mode identification code is 1, the block coding unit further encodes the to-be-coded area. The values in the block are respectively subtracted from the minimum value identification code and then divided by 2 and then subjected to an integer operation to obtain the coded values in the corresponding coded block. The generator of the overdrive lookup table of the liquid crystal display device of claim 21, wherein the method by which the block coding unit performs the integer operation comprises unconditionally rounding off. The generator of the overdrive lookup table of the liquid crystal display device of claim 20, further comprising: a block decoding unit coupled to the block coding unit, wherein the block decoding unit encodes the code values Decode. The generator of the overdrive lookup table of the liquid crystal display device of claim 23, wherein in each coded block, the block decoding unit determines that the pattern identification code is 0, the block decoding The unit adds the minimum value identification code to the coded values in the coded block, and when the block decoding unit determines that the mode identification code is 1, the block decoding unit uses the coded blocks in the coded block. The value after the coded value is multiplied by 2 is added to the minimum value identification code, respectively.