CN101334984B - Method and apparatus for generating overdrive data - Google Patents

Abstract

The invention provides a method and a device for generating overdrive data, wherein the method comprises the following steps: storing a reduced overdrive table and a preset weight value table; (b) finding out a first reference value and a second reference value from the reduced overdrive table according to a previous pixel value and a current pixel value; (c) finding out a first weighted value and a second weighted value from the preset weighted value table according to the current pixel value; (d) generating overdrive data using the first reference value, the second reference value, the first weighting value, and the second weighting value. The device comprises a storage unit, a reference value generation unit, a weighted value generation unit and a calculation unit. The method and the device for generating the overdrive data can effectively reduce the size of the overdrive table, maintain the quality of an output picture and provide greater convenience for a user.

Description

Method and device for generating overdrive data

technical field

The invention relates to a method and device for generating data, in particular to a method and device for generating overdrive data.

Background technique

Please refer to Figure 1. FIG. 1 is a schematic diagram of an original uncompressed overdrive table. In order to speed up the response speed of the liquid crystal in the liquid crystal display, generally when the liquid crystal is driven, the liquid crystal is driven in an overdrive manner. The size of the overdrive grayscale value can be obtained by looking up the overdrive table. As shown in Figure 1, F1 represents the preset previous pixel value (grayscale value of the previous picture), and F2 represents the preset pixel value. Current pixel value (grayscale value of this picture). Taking the gray scale of 256 levels (8 bits) as an example, the generated overdrive table will have a size of 256×256×256 bytes (that is, 32Kbytes). However, the driver chips of general liquid crystal displays cannot store such large-capacity data.

Please refer to Figure 2. Fig. 2 is a schematic diagram of the reduced overdrive table. As shown in the figure, Figure 2 reduces the resolution of Figure 1 and discards some of the data. For example, when the preset previous pixel value is within 0-32 and the preset current pixel value is within 32-64, the corresponding overdrive grayscale values are all 0. Therefore, according to the overdrive table in FIG. 2 , it can be known that its size will be reduced to 8×8×256 bytes (that is, 64 bytes), which is obviously smaller than the unreduced overdrive table. However, as a result of reducing the amount of data, the overdrive force will be insufficient to reduce the response speed of the liquid crystal or the picture will be distorted.

Contents of the invention

The main purpose of the present invention is to provide a method and device for generating overdrive data, which overcomes the shortcomings of the prior art that the overdrive table is too large, the response speed is slow or the picture is distorted.

The present invention provides a method of generating overdrive data. It consists of the following steps:

(a) storing a reduced overdrive table and a default weight table;

(b) finding a first reference value and a second reference value from the reduced overdrive table according to a previous pixel value and a current pixel value;

(c) finding a first weighted value and a second weighted value from the preset weighted value table according to the current pixel value; and

(d) generating overdrive data by using the first reference value, the second reference value, the first weighted value, and the second weighted value.

The invention provides an overdrive data generating device for generating overdrive data according to a previous pixel value and a current pixel value. The overdrive data generating device comprises:

a storage unit for storing a reduced overdrive table and a preset weight table;

a reference value generating unit coupled to the storage unit, the reference value generating unit is used to find a corresponding first reference from the reduced overdrive table according to the previous pixel value and the current pixel value value and a second reference value;

a weight value generation unit, coupled to the storage unit, the weight value generation unit is used to find a corresponding first weight value and a second weight value from the preset weight value table according to the current pixel value weighted value; and

A calculation unit, coupled to the reference value generation unit and the weighted value generation unit, the calculation unit is used to calculate according to the first reference value, the second reference value, the first weighted value and the The second weighting value is used to generate overdrive data.

Compared with the prior art, the method and device for generating overdrive data in the present invention can effectively reduce the size of the overdrive table while maintaining the quality of the output image, and provide greater convenience for users.

Description of drawings

FIG. 1 is a schematic diagram of an original uncompressed overdrive table.

Fig. 2 is a schematic diagram of the reduced overdrive table.

FIG. 3 is a schematic diagram of the reduced overdrive table of the present invention.

FIG. 4 is a schematic diagram of a preset weight table in the present invention.

FIG. 5 is a schematic diagram of a method for generating an overdrive value by calculation using a reduced overdrive table according to the present invention.

FIG. 6 is a schematic diagram of an overdrive data generating device of the present invention.

Explanation of reference signs: F1-preset previous pixel value; F2-preset current pixel value; OD-overdrive value; 300-overdrive table; 400-preset weight table; a, b-pixel value; D1, D2-difference; 500-method; 501-506-step; 600-overdrive data generating device; 610-storage unit; 620-reference value generating unit; 630-weighted value generating unit; 640-computing unit; 621 , 622, 623-preset pixel value generating subunits; 624, 625-sub-reference value generating subunits.

Detailed ways

The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

Please refer to Figure 3 and Figure 4 at the same time. FIG. 3 is a schematic diagram of a reduced overdrive table 300 of the present invention. FIG. 4 is a schematic diagram of a preset weight table 400 of the present invention. As shown in FIG. 3 , the reduced overdrive table 300 is composed of an array of preset previous pixel values ( F1 ) and preset current pixel values ( F2 ). However, the present invention reduces the resolution of the preset current pixel value ( F2 ) to reduce the size of the overdrive table 300 . As shown in the figure, the present invention only reduces the resolution of the current pixel value of the overdrive table 300 from the original 255 steps to 8 steps, that is, from the original 8 bits to 3 bits. The metadrive table 300 size will be reduced to 256x256x8 bytes.

As shown in the overdrive table 300, when the preset previous pixel value is 0 and the preset current pixel value is 0, the corresponding overdrive value is OD(0,0); when the preset previous pixel value is 1. When the preset current pixel value is 32, the corresponding overdrive value is OD(1, 32); when the preset previous pixel value is 255 and the preset current pixel value is 32, the corresponding overdrive value The drive value is OD(255, 32)...and so on. In this way, according to the received previous pixel value and the received current pixel value, the overdrive table 300 of the present invention can be used to find the required overdrive value to drive the liquid crystal display. For example, when the received previous pixel value (X-1) is 0 and the received current pixel value (X) is 32, the overdrive value generated at this time is OD(0,32) , and this drive value OD (0, 32) can be used to overdrive the liquid crystal display.

When the received current pixel value X is not just at the preset current pixel value of the overdrive table 300 (such as 0, 32, 64, 96, 128, 160, 192, 224, 255), the present invention utilizes the The weight table 400 is preset to calculate the overdrive value OD that should be generated. As can be seen from the preset weight table 400 in FIG. It must fall between the preset current pixel values F2(a-) and F2(a+). For example, if the currently received pixel value X is 44, 44 will fall between the preset current pixel value F2(44-) and the current pixel value F2(44+), wherein F2(44-) is equal to 32, F2 (44+) is equal to 64. The overdrive value OD corresponding to the currently received pixel value X can be calculated according to the weighted value between the currently received pixel value X and the preset current pixel values F2(a-) and F2(a+). drive value to decide. As shown in Figure 4, when the currently received pixel value X is a, the difference between it and the preset current pixel value F2(a-) is D1 (equal to a-F2(a-)), and the preset current pixel value The difference between pixel values F2(a-) is D2 (equal to F2(a+)-a). Then when the currently received pixel value X is a, the weighted value P1 with the preset current pixel value F2(a-) is equal to (a-F2(a-))/(F2(a+)-F2(a-)), The weighted value P2 with the preset current pixel value F2(a+) is equal to (F2(a+)-a)/(F2(a+)-F2(a-)).

Therefore, when the previously received pixel value (X-1) is b and the currently received pixel value X is a, the preset weight table 400 can be used to find out the preset value corresponding to the currently received pixel value X being a. Set the current pixel values F2(a-) and F2(a-). According to the overdrive table 300, find out the overdrive value OD(b, a-) corresponding to the preset previous pixel value F1 as b and the preset current pixel value F2 as F2(a-); and find out the corresponding The preset previous pixel value F1 is b and the preset current pixel value F2 is the overdrive value OD(b, a+) of F2(a+). Then multiply the overdrive value OD(b, a+) by the weighted value P2, plus the overdrive value OD(b, a-) multiplied by the weighted value P1, which is the pixel value (X-1 ) is b, and the overdrive value OD(b, a) when the currently received pixel value X is a.

Therefore, according to the above, the overdrive value OD(b, a) can be classified as the formula for generating the overdrive value when the previously received pixel value (X-1) is b and the currently received pixel value X is a:

P1＝(a-F2(a-))/(F2(a+)-F2(a-)) (1)

P2＝(F2(a+)-a)/(F2(a+)-F2(a-)) (2)

OD(b, a)=P1×OD(b,a-)+P2×OD(b,a+) (3)

The method shown in the overdrive table 300 is just an example, and any method of reducing the current pixel value to reduce the size of the overdrive table falls within the scope of the present invention.

Please refer to Figure 5. FIG. 5 is a schematic diagram of a method 500 for computationally generating overdrive values using a reduced overdrive table according to the present invention. The method 500 is used to generate the required overdrive value OD(b, a) when the previously received pixel value (X−1) is b and the currently received pixel value X is a. The steps are as follows:

Step 501: start;

Step 502: storing the reduced overdrive table 300 and the default weight table 400;

Step 503: According to the received previous pixel value (X-1) and the received current pixel value X, find the over-reference value OD(b, a-) and over-reference value OD(b) from the reduced overdrive table , a+);

Step 504: Find a first weighted value P1 and a second weighted value P2 from the preset weighted value table according to the current pixel value X;

Step 505: Generate the overdrive value OD( b, a);

Step 506: end.

Step 504 generates weighted values P1 and P2 according to formulas (1) and (2). Step 505 generates the calculated overdrive value OD according to formula (3).

Please refer to Figure 6. FIG. 6 is a schematic diagram of an overdrive data generating device 600 of the present invention. As shown in the figure, the overdrive data generation device 600 includes a storage unit 610 , a reference value generation unit 620 , a weight value generation unit 630 and a calculation unit 640 .

The storage unit 610 is used for storing the reduced overdrive table 300 and the default weight table 400 .

The reference value generation unit 620 is coupled to the storage unit 610, and is used to find the corresponding first reference value OD(b, a) from the overdrive table 300 according to the received previous pixel value (X-1) and the current pixel value X -) and the second reference value OD(b, a-). The reference value generation unit 620 includes default pixel value generation subunits 621 , 622 and 623 , and sub-reference value generation subunits 624 and 625 .

The default pixel value generation subunit 621 is used for finding the preset pixel value b corresponding to the received previous pixel value (X−1) from the preset previous pixel values (F1) in the overdrive table 300 .

The default pixel value generation subunit 622 is used to find out the current pixel value X that is preset from the current pixel value (F2) preset in the overdrive table 300 and corresponds to the preset pixel value F2 that is closest to but smaller than the current pixel value. (a-).

The default pixel value generating subunit 623 is used to find out the current pixel value X preset in the overdrive table 300 (F2) corresponding to the preset pixel value F2 that is closest to but greater than the current pixel value (a+).

The sub-reference value generating subunit 624 is used for generating the first reference value OD(b, a-) according to the preset pixel value b and the preset pixel value F2(a-). The sub-reference value generating subunit 625 is used for generating the second reference value OD(b, a+) according to the preset pixel value b and the preset pixel value F2(a+).

The weight value generation unit 630 is coupled to the storage unit 610, and is used to find the corresponding first weight value from the preset weight value table 400 according to the current pixel value X and formulas (1) and (2). P1 and the second weighted value P2.

Calculation unit 640, coupled to the reference value generation device 620 and the weighted value generation device 630, the calculation device is used to receive the first reference value OD(b, a-) and the second reference value OD(b, a-), the first weighted value P1 and the second weighted value P2, and according to the formula (3), generate the required overdrive value OD(b, a).

To sum up, using the method and device for generating overdrive data of the present invention can effectively reduce the size of the overdrive table while maintaining the quality of the output image and provide greater convenience for users.

The above description is only illustrative, rather than restrictive, to the present invention. Those of ordinary skill in the art understand that many modifications and changes can be made without departing from the spirit and scope defined by the following appended claims. Or equivalent, but all will fall within the protection scope of the present invention.

Claims (2)

1. method that produces extremely drive data is characterized in that it comprises following steps:

(a) store one and reduce overdrive a table and a preset weights table;

(b), overdrive from described reduction and to show to find out one first reference value and one second reference value according to a previous picture element value and a present picture element value;

(c) according to described present picture element value, find out one first weighted value and one second weighted value from described preset weights table; And

(d) utilize described first reference value, described second reference value, described first weighted value and described second weighted value, produce extremely drive data.

Described reduction is overdrived and is shown to comprise by one first group of default picture element value and one second group of array that default picture element value is constituted; Described step (b) comprises:

(b1) in described first group of default picture element value, find out described previous picture element value pairing one the 3rd default picture element value;

(b2) in described second group of default picture element value, find out described present picture element value pairing one the 4th default picture element value and one the 5th default picture element value;

The described the 4th default picture element value is that the present picture element value correspondence that received is the most approaching but less than the default picture element value of picture element value at present;

The described the 5th default picture element value is that the present picture element value correspondence that received is the most approaching but greater than the default picture element value of picture element value at present;

(b3) according to the described the 3rd default picture element value and the described the 4th default picture element value, produce described first reference value; And

(b4) according to the described the 3rd default picture element value and the described the 5th default picture element value, produce described second reference value;

In described step (c), utilize described present picture element value to preset the difference of picture element value respectively with the described the 4th default picture element value, the 5th, find out described first weighted value and described second weighted value from described preset weights table;

Described first weighted value produces according to a first party formula, and described first party formula is: P1=(C-PR4)/(PR5-PR4), and described second weighted value produces according to a second party formula, and described second party formula is: P2=(PR5-C)/(PR5-PR4); Wherein, on behalf of described first weighted value, C, P1 represent described present picture element value, PR4 to represent the described the 4th default picture element value, PR5 to represent the described the 5th default picture element value, P2 to represent described second weighted value;

Described extremely drive data produces according to an equation, and described equation is: OD=(R1 * P1)+(R2 * P2); Wherein on behalf of described extremely drive data, R1, OD represent described first reference value, P1 to represent described first weighted value, R2 to represent described second reference value, P2 to represent described second weighted value.

2. extremely drive data generation device in order to produce an extremely drive data according to a previous picture element value and a present picture element value, is characterized in that described extremely drive data generation device comprises:

One storage element reduces overdrive a table and a preset weights table in order to store one;

One reference value generation unit is coupled to described storage element, and described reference value generation unit is used for according to described previous picture element value and described present picture element value, overdrives from described reduction and shows to find out corresponding one first reference value and one second reference value;

One weighted value generation unit is coupled to described storage element, and described weighted value generation unit is used for according to described present picture element value, finds out corresponding one first weighted value and one second weighted value from described preset weights table; And

One computing unit is coupled to described reference value generation unit and described weighted value generation unit, and described computing unit is used for according to described first reference value, described second reference value, described first weighted value and described second weighted value, produces extremely drive data;

Described reduction is overdrived and is shown to comprise by one first group of default picture element value and one second group of array that default picture element value is constituted;

Described reference value generation unit comprises:

One the 3rd default picture element value produces subelement, is used for finding out described previous picture element value pairing one the 3rd default picture element value in described first group of default picture element value;

One the 4th default picture element value produces subelement, is used for finding out described present picture element value pairing one the 4th default picture element value in described second group of default picture element value;

One the 5th default picture element value produces subelement, is used for finding out described present picture element value pairing one the 5th default picture element value in described second group of default picture element value;

The described the 4th default picture element value is that the present picture element value correspondence that received is the most approaching but less than the default picture element value of picture element value at present;

The described the 5th default picture element value is that the present picture element value correspondence that received is the most approaching but greater than the default picture element value of picture element value at present;

One first sub-reference value produces subelement, is used for producing described first reference value according to the described the 3rd default picture element value and the described the 4th default picture element value; And

One second sub-reference value produces subelement, is used for producing described second reference value according to the described the 3rd default picture element value and the described the 5th default picture element value;

Described first weighted value and described second weighted value utilize described present picture element value to preset the difference of picture element value respectively with the described the 4th default picture element value, the 5th, find out from described preset weights table;

Described first weighted value produces according to a first party formula, and described first party formula is: P1=(C-PR4)/(PR5-PR4), and described second weighted value produces according to a second party formula, and described second party formula is: P2=(PR5-C)/(PR5-PR4); Wherein, on behalf of described first weighted value, C, P1 represent described present picture element value, PR4 to represent the described the 4th default picture element value, PR5 to represent the described the 5th default picture element value, P2 to represent described second weighted value;

Described extremely drive data produces according to an equation, and described equation is: OD=(R1 * P1)+(R2 * P2); Wherein on behalf of described extremely drive data, R1, OD represent described first reference value, P1 to represent described first weighted value, R2 to represent described second reference value, P2 to represent described second weighted value.

Images