TWI433125B - Over drive display method and circuit using thereof - Google Patents

Description

Overdrive display method and overdrive circuit

The present invention relates to an overdrive method, and more particularly to an overdrive method for achieving a better overdriving display effect by increasing the rotational speed of red liquid crystal molecules in a liquid crystal display (LCD).

In today's fast-changing technology era, Over Drive display technology has been developed to speed up the rotation of liquid crystal molecules in liquid crystal displays (LCDs), thereby improving the LCD display. Quality technical effects. In the prior art, the overdrive display technology uses a time domain lookup table to select sub-pixel data corresponding to the same position in the two frames of data before and after (for example, red, green, and blue sub-pixels). Data) Find out the corresponding one-pass drive sub-pixel data.

However, in the prior art, the aforementioned time domain lookup table is related to the establishment of an operating environment at a normal temperature (for example, 25 degrees Celsius). If the user uses the LCD in a low temperature environment (for example, about 10 degrees Celsius), the rotation speed of the liquid crystal molecules becomes slower because of the lower temperature, so that even if we use the driving sub-pixels According to the data, the quality of the LCD display may still be reduced because the liquid crystal molecules are not rotating fast enough. In this way, how to design a driving method that can increase the rotational speed of liquid crystal molecules in a low temperature environment is one of the directions that the industry is constantly striving for.

The present invention relates to an overdrive method for determining whether an image data to be displayed by a liquid crystal display (LCD) corresponds to a face image condition, and thereby selectively enhancing the image data. The gray scale value of the red sub-pixel data makes the LCD have good picture display quality. Accordingly, the overdrive method of the present invention can effectively further increase the rotational speed of liquid crystal molecules in the LCD in a low temperature operating environment and correspondingly provide better picture display quality than the conventional overdrive method.

According to a first aspect of the present invention, an overdrive display method is provided, which generates a liquid crystal display (LCD) by referring to the first and second pixel data, and the first and second pixel data are respectively It is the pixel data corresponding to the same position in the nth and n+1th frame data, and n is an integer. The overdrive method includes the following steps. First, the first red, first green, and first blue sub-pixel data in the first pixel data are found. Then, the second red, second green, and second blue sub-pixel data in the second pixel data are found. Then refer to the first and second green sub-pixel data to find the green overdrive sub-pixel data. Then, the blue overdrive sub-pixel data is found by referring to the first and second blue sub-pixel data. Then refer to the first red, green and blue and the second red, green and blue sub-pixel data, at least four of the pixel data to find the red overdrive sub-pixel data. The driven pixel data is obtained based on the green, blue, and red overdrive sub-pixel data.

According to a second aspect of the present invention, an overdrive circuit is provided, reference The first and second pixel data are generated by driving the pixel data to drive the LCD, and the first and second pixel data are respectively pixel data corresponding to the same position in the nth and n+1th frame data, n is Integer. The overdrive circuit includes a buffer, a memory, and a controller. The buffer receives the nth frame data and delays it for a period of time after the frame is output. Memory storage code. The controller reads the code to perform the overdrive method, which includes the following steps. First, the first red, first green, and first blue sub-pixel data in the first pixel data are found. Then, the second red, second green, and second blue sub-pixel data in the second pixel data are found. Then refer to the first and second green sub-pixel data to find the green overdrive sub-pixel data. Then, the blue overdrive sub-pixel data is found by referring to the first and second blue sub-pixel data. Then refer to the first red, green and blue and the second red, green and blue sub-pixel data, at least four of the pixel data to find the red overdrive sub-pixel data. The driven pixel data is obtained based on the green, blue, and red overdrive sub-pixel data.

In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

The Over Drive method of the embodiment of the present invention enhances the screen display of a liquid crystal display (LCD) by selectively increasing the gray scale value of the red sub-pixel data in the image data to be displayed. quality.

Please refer to FIG. 1 , which illustrates an overdrive power according to an embodiment of the invention. The block diagram of the road. The overdrive circuit 10 is configured to receive the image data Dv provided by the signal source 12, and drive the liquid crystal display (LCD) 14 to display the corresponding image. The image data Dv includes a plurality of frame data; for example, the nth frame data Df_n and the n+1th frame data Df_n+1 in the image data Dv include pixel data Dpx1 and Dpx2, respectively. The prime data Dpx1 and Dpx2 are pixel data corresponding to the same position in the nth and n+1th frame data Df_n and Df_n+1, respectively, as shown in FIGS. 2A and 2B.

The overdrive circuit 10 includes a buffer 10a, a memory 10b, and a controller 10c. The buffer 10a receives the nth frame data Df_n and outputs it after delaying a frame period. The memory 10b stores the code, and the controller 10c reads the code to execute the overdrive method. The overdrive method performed by the controller 10c has, for example, flow steps (a)-(f) shown in FIG.

First, as step (a), the controller 10c finds the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b in the pixel data Dpx1. Next, as in step (b), the controller 10c finds the red, green, and blue sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b in the pixel data Dpx2.

Then, as in step (c), the controller 10c refers to the green sub-pixel data Dpx1_g and Dpx2_g to find the green overdrive sub-pixel data Dod_g. For example, the controller 10c generates a two-dimensional (2D) green overdrive lookup table according to the code stored in the memory 10b, and correspondingly the two front and back through the 2D green overdrive lookup table. The green sub-pixel data Dpx1_g and Dpx2_g to the same position are mapped to a corresponding green overdrive sub-pixel data Dod_g.

Then, as step (d), the controller 10c refers to the blue sub-pixel data. Dpx1_b and Dpx2_b find the blue overdrive sub-pixel data Dod_b. For example, the controller 10c generates a 2D blue overdrive lookup table according to the code stored in the memory 10b, and correspondingly the blue and white pixels corresponding to the same position through the 2D blue overdrive lookup table. The data is mapped to a corresponding blue overdrive sub-pixel data Dod_b.

Then, as step (e), the controller 10c refers to the red sub-pixel data Dpx1_r and Dpx2_r, the green sub-pixel data Dpx1_g and Dpx2_g, and the blue sub-pixel data Dpx1_b and Dpx2_b at least four of the pixel data to find out The red overdrive sub-pixel data Dod_r. For example, the controller 10c generates a four-dimensional (4D) to six-dimensional (6D) red overdrive lookup table according to the code stored in the memory 10b, and searches for the red overdrive by the red overdrive. The table maps the aforementioned at least four-time pixel data to a corresponding red overdrive sub-pixel data Dod_r.

Then, in step (f), the controller 10c generates the overdrive pixel data Dpx_od according to the green, blue, and red overdrive sub-pixel data Dod_g, Dod_b, and Dod_r, and drives the LCD 14 to display the corresponding image frame.

In more detail, the step (e) shown in the above third embodiment further includes the steps (e1) to (e4) as shown in Fig. 4. In step (e1), the controller 10c finds the intermediate sub-pixel data Psxc based on the red sub-pixel data Dpx1_r and Dpx2_r. For example, the controller 10c generates a 2D red overdrive lookup table similar to the 2D green and 2D blue overdrive lookup table according to the code stored in the memory 10b to match the front and rear two pens to the red of the same position. The sub-pixel data Dpx1_r and Dpx2_r are mapped to a corresponding intermediate sub-pixel data Psxc.

Next, as step (e2), the controller 10c determines whether the pixel data Dpx1 satisfies the face image condition based on the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b. When the pixel data Dpx1 satisfies the face image condition, step (e3) is executed, the controller 10c determines the gain G1 whose value is greater than 1, and enlarges the intermediate sub-pixel data Psxc according to the gain G1 to generate red overdrive sub-pixel data. Dod_r. When the pixel data Dpx1 does not satisfy the face image condition, step (e4) is performed, and the controller 10c sets the gain G1 to correspond to the value 1, thereby generating the red overdrive sub-pixel data with the unmagnified intermediate pixel data Psxc. Dod_r.

For example, the face image condition is defined by the gray-scale value relationship between the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b in the n-th frame data Df_n.

In one example, step (e2) further includes steps (e21)-(e25) as shown in FIG. First, as step (e21), the controller 10c calculates the grayscale value parameter Prg1 based on the grayscale values of the red and green sub-pixel data Dpx1_r and Dpx1_g. Next, as step (e22), the controller 10c calculates the grayscale value parameter Prb1 based on the grayscale values of the red and blue subpixel data Dpx1_r and Dpx1_b. In one example, the controller 10c calculates the gray-scale value parameter Prg1 related to the gray-scale value ratio between the red and green sub-pixel data Dpx1_r and Dpx1_g and the red and blue sub-pixels respectively according to the following expressions. Gray scale value parameter Prb1 of the gray scale value ratio between data Dpx1_r and Dpx1_b: and

Then, as step (e23), the controller 10c determines whether the grayscale value parameter Prg1 falls within the first parameter interval and determines whether the grayscale value parameter Prb1 falls within the second parameter interval, thereby determining whether the pixel data Dpx1 satisfies the person. Face image conditions. When the grayscale value parameter Prg1 falls within the first parameter interval or the grayscale value parameter Prb1 falls within the second parameter interval, step (e24) is performed, and the controller 10c determines that the pixel data Dpx1 satisfies the face image condition; When the order value parameter Prg1 falls outside the first parameter interval and the gray-scale value parameter Prb1 falls outside the second parameter interval, step (e25) is performed, and the controller 10c determines that the pixel data Dpx1 does not satisfy the face image condition. .

For example, the controller 10c further establishes two one-dimensional lookup tables respectively for assigning the grayscale value parameter Prg1 to the gain Grg1 and the grayscale value parameter Prb1 to the gain Grb1, respectively, according to the following expressions. This gain G1 and red sub-pixel data Dod_r: G1=Grg1×Grb1

Dod_r=G1×Psxc The two one-dimensional (1D) look-up tables are as shown in FIGS. 6A and 6B, respectively, and the one-dimensional table correspondence between the gray-scale value parameter Prg1 and the gain Grg1 and the gray scale The one-dimensional table correspondence between the value parameter Prb1 and the gain Grb1 can be as shown in FIGS. 7A and 7B. The first and second ranges of values correspond to the range of values L1-L3 and 11-13, respectively.

For example, the face image condition is a condition that the grayscale value parameter Prg1 falls between the first numerical range L1-L3 or the grayscale value parameter Prb1 falls between the second numerical range 11-13: C=(L1<Prg1<L3)∩(l1<Prb1<l3) where C is a face image condition.

When the face image condition C is established, the gain Grg1 or Grb1 will be corresponding to a value greater than 1, and the gain G1 correspondingly has a value greater than one. According to this, the controller 10c can enlarge the intermediate sub-pixel data Psxc according to the gain G1 whose value is greater than 1 to obtain the red overdrive sub-pixel data Dod_r. When the face image condition C does not hold (that is, the grayscale value parameter Prg1 corresponds to one of the values L0, L1, and L3-L8 and the grayscale value parameter Prb1 corresponds to one of the values 10, 11, and 13-18) At this time, the gains Grg1 and Grb1 all correspond to the value 1, and accordingly, the controller 10c enlarges the intermediate sub-pixel data Psxc according to the gain G1 (=Grg1 × Grb1 = 1 × 1) whose value is equal to 1 to provide substantial The red overdrive sub-pixel data Dod_r is equal to the intermediate sub-pixel data Psxc.

In the present embodiment, only the face image condition is defined by the gray-scale value relationship between the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, and Dpx1_b in the n-th frame data Df_n. For example, the overdrive circuit 10 of the present embodiment is not limited thereto. In another example, the face image condition is defined by the gray-scale value relationship between the red, green, and blue sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b in the n+1th frame data Df_n+1. Or, at the same time, the gray scale value relationship between the six-pixel data Dp_1_r, Dpx1_g, Dpx1_b, Dpx2_r, Dpx2_g, and Dpx2_b in the nth and n+1th frame data Df_n and Df_n+1 is defined.

In more detail, the controller 10c can also implement the gray scale between the red, green, and blue sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b in the n+1th frame data Df_n+1 according to the following equation. Value relationship to define the overdrive method for this face image condition:

G2=Grg2×Grb2

Dod_r=G2×Psxc

C=(L1'<Prg2<L3')∩(l1'<Prb2<l3') wherein the corresponding method flowchart is as shown in FIG. 8 and FIG. 9; the corresponding two one-dimensional lookup tables are respectively, for example, 10A and 10B; the 1D lookup table between the grayscale value parameter Prg2 and the gain Grg2 and the 1D lookup table between the grayscale value parameter Prb2 and the gain Grb2 can be as shown in Fig. 11A and Fig. 11B. Shown. In other words, the 4D red lookup table applied by the controller 10c at this time is based on the red sub-pixel data Dpx1_r in the nth frame data Df_n, the red, green and blue in the n+1th frame data Df_n+1. The sub-pixel data Dpx2_r, Dpx2_g, and Dpx2_b are mapped to obtain the red overdrive sub-pixel data Dod_r.

In another example, the controller 10c may also implement six-time pixel data Dpx1_r, Dpx1_g, Dpx1_b in the nth and n+1th frame data Df_n and Df_n+1 according to the following equations. The gray-scale relationship between Dpx2_r, Dpx2_g, and Dpx2_b defines the overdrive method for this face image condition:

G=Grg1×Grb1×Grg2×Grb2

Dod_r=G×Psxc

C=(L1<Prg1<L3)∩(l1<Prb1<l3)∩(L1'<Prg2<L3')∩(l'<Prb2<l3') In other words, the controller 10c applies the 6D red lookup table at this time. According to the red, green, and blue sub-pixel data of the red, green, and blue sub-pixel data Dpx1_r, Dpx1_g, Dpx1_b, and n+1th frame data Df_n+1 in the n-th frame data Df_n Dpx2_r, Dpx2_g, and Dpx2_b are mapped to obtain red overdrive sub-pixel data Dod_r.

In the present embodiment, the intermediate sub-pixel data Psxc and the gray-scale value parameter Prg1 are obtained based on the red sub-pixel data Dpx1_r and Dpx2_r, respectively, based on a 2D look-up table and two 1D look-up tables. The table obtains the gain Grg1 and obtains the gain Grb1 according to the gray-scale value parameter Prb1 to obtain the gain of the red overdrive sub-pixel data Dod_r by using the 4D look-up table as an example. However, this embodiment has The driving circuit 10 is not limited thereto, and the operation of generating the red overdrive sub-pixel data Dod_r by the 4D look-up table can be realized through other difference table methods.

The overdrive method of this embodiment determines whether the image data to be displayed by the LCD corresponds to the face image condition, and accordingly selectively increases the grayscale value of the red sub-pixel data in the image data. Accordingly, when the LCD to which the overdrive method of the present embodiment is applied is operated in a low temperature environment, it can still further improve the corresponding red color by selectively satisfying the face image condition when the image data to be displayed is satisfied. The driving voltage of the liquid crystal molecules, thereby improving the picture display quality of the LCD. Accordingly, compared to the conventional overdrive method, The overdrive method of the present embodiment can effectively further increase the rotational speed of liquid crystal molecules in the LCD in a low temperature operating environment, and correspondingly provide better picture display quality.

In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

12‧‧‧Signal source

10‧‧‧Overdrive circuit

14‧‧‧LCD display

10a‧‧‧buffer

10b‧‧‧ memory

10c‧‧‧ controller

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

2A and 2B are schematic diagrams showing the nth and n+1th frame data Df_n and Df_n+1, respectively.

FIG. 3 is a flow chart showing an overdrive method in accordance with an embodiment of the present invention.

4 is a detailed flow chart showing step (e) of the overdrive method in accordance with an embodiment of the present invention.

FIG. 5 is a detailed flow chart showing step (e2) in the overdrive method according to an embodiment of the present invention.

FIG. 6A and FIG. 6B are respectively schematic diagrams showing one of the dimension tables used in the overdrive method according to the embodiment of the present invention.

7A and 7B are diagrams showing the relationship between the gain value and the grayscale value parameter in FIGS. 6A and 6B, respectively.

8 is a diagram showing steps in an overdrive method according to an embodiment of the present invention. Detailed flowchart of (e’).

Figure 9 is a detailed flow chart showing the step (e2') in the overdrive method in accordance with an embodiment of the present invention.

FIG. 10A and FIG. 10B are schematic diagrams respectively showing one of the dimension tables used in the overdrive method according to the embodiment of the present invention.

11A and 11B are diagrams showing the relationship between the gain value and the grayscale value parameter in FIGS. 10A and 10B, respectively.

(a)-(F)‧‧‧ Process steps

Claims (20)

An overdrive method for generating a liquid crystal display (LCD) by referring to a first pixel data and a second pixel data to generate an overdrive pixel data, the first and the first The two-picture data is an n-th frame data and a pixel data corresponding to a same position in an n+1th frame data, where n is a positive integer greater than 0, and the overdrive method includes: One of the first pixel data, the first green sub-pixel data, and the first blue sub-pixel data; and one of the second pixel data Red sub-pixel data, a second green sub-pixel data and a second blue sub-pixel data; refer to the first and the second green sub-pixel data to find a green over-driven sub-pixel data; The first and the second blue sub-pixel data find a blue overdrive sub-pixel data: refer to the first red, the second red, the first green, the second green, the first blue Color and the second blue sub-pixel data, at least four of the pixel data to find one Overdrive sub-pixel color information; and according to the green, the blue and the red sub-pixel overdrive overdrive pixel data to get the information. The overdrive method of claim 1, wherein the generating the red overdrive sub-pixel data comprises: finding an intermediate sub-pixel data according to the first and second red sub-pixel data; According to the first red color, the first green color, and the first blue color painting Determining whether the first pixel data satisfies a face image condition; and when the first pixel data satisfies the face image condition, setting a first gain and thereby amplifying the intermediate pixel data to generate The red overdrive sub-pixel data, wherein the value of the first gain is greater than one. The overdrive method of claim 2, wherein when the first pixel data does not satisfy the face image condition, setting the first gain to a value of 1, thereby not including the intermediate pixel data Zoom in. The overdrive method of claim 2, wherein the step of determining whether the first pixel data satisfies the face image condition comprises: gray scale according to the first red color and the first green sub-pixel data Calculating a first grayscale value parameter; calculating a second grayscale value parameter according to the grayscale value of the first red and the first blue subpixel data; determining whether the first grayscale value parameter falls in a a first parameter interval, and determining whether the second grayscale value parameter falls within a second parameter interval; when the first grayscale value parameter falls within the first parameter interval or the second grayscale value parameter falls in the first In the two parameter interval, determining that the first pixel data satisfies the facial image condition; and when the first grayscale value parameter falls outside the first parameter interval and the second grayscale value parameter falls in the second When the parameter interval is outside, it is determined that the first pixel data does not satisfy the face image condition. The overdrive method of claim 2, wherein the step of generating the red overdrive sub-pixel data further comprises: according to the second red, the second green, and the second blue color Determining whether the second pixel data satisfies a face image condition; and when the second pixel data satisfies the face image condition, setting a second gain and thereby amplifying the intermediate sub-pixel data to generate The red overdrive sub-pixel data, wherein the value of the first gain is greater than one. The overdrive method of claim 5, wherein when the second pixel data does not satisfy the face image condition, setting the second gain to a value of 1, thereby not including the intermediate pixel data Zoom in. The overdrive method of claim 5, wherein the step of determining whether the first pixel data satisfies the face image condition comprises: gray scale according to the second red and the second green sub-pixel data Calculating a first grayscale value parameter; calculating a second grayscale value parameter according to the grayscale value of the second red and the second blue subpixel data; determining whether the first grayscale value parameter falls in a a first parameter interval, and determining whether the second grayscale value parameter falls within a second parameter interval; when the first grayscale value parameter falls within the first parameter interval or the second grayscale value parameter falls in the first In the two parameter interval, determining that the second pixel data satisfies the facial image condition; and when the first grayscale value parameter falls outside the first parameter interval and the second grayscale value parameter falls in the second When the parameter interval is outside, it is determined that the second pixel data does not satisfy the face image condition. The overdrive method of claim 1, wherein the step of generating the red overdrive sub-pixel data comprises: finding an intermediate time based on the first and second red sub-pixel data a pixel data; determining, according to the second red color, the second green color, and the second blue sub-pixel data, whether the second pixel data satisfies a face image condition; and when the second pixel material satisfies the person In the case of the face image condition, a second gain is set and the intermediate pixel data is amplified to generate the red overdrive sub-pixel data, wherein the value of the first gain is greater than one. The overdrive method of claim 8, wherein when the second pixel material does not satisfy the face image condition, setting the second gain to a value of 1, thereby not including the intermediate pixel data Zoom in. The overdrive method of claim 8, wherein the step of determining whether the first pixel data satisfies the facial image condition comprises: gray scale according to the second red and the second green sub-pixel data Calculating a first grayscale value parameter; calculating a second grayscale value parameter according to the grayscale value of the second red and the second blue subpixel data; determining whether the first grayscale value parameter falls in a a first parameter interval, and determining whether the second grayscale value parameter falls within a second parameter interval; when the first grayscale value parameter falls within the first parameter interval or the second grayscale value parameter falls in the first In the two parameter interval, determining that the second pixel data satisfies the facial image condition; and when the first grayscale value parameter falls outside the first parameter interval and the second grayscale value parameter falls in the second When the parameter interval is outside, it is determined that the second pixel data does not satisfy the face image condition. An overdrive circuit for reference to a first The stroke data and the second pixel data generate a driving pixel data, and drive a liquid crystal display (LCD), wherein the first and the second pixel data are respectively an nth pen The frame data and the n+1th frame data correspond to pixel data of the same position, where n is a positive integer greater than 0, and the overdrive circuit includes: a buffer for receiving the nth image Frame data and outputting it after a frame period; a memory for storing a code; and a controller for reading the code to perform an overdrive method, the overdrive method includes: One of the first pixel data, the first green sub-pixel data, and the first blue sub-pixel data; and one of the second pixel data Red sub-pixel data, a second green sub-pixel data and a second blue sub-pixel data; refer to the first and the second green sub-pixel data to find a green over-driven sub-pixel data; The first and the second blue sub-pixel data find a blue overdrive Moving pixel data: referencing at least four pixels of the first red color, the second red color, the first green color, the second green color, the first blue color, and the second blue sub-pixel data The data is used to find a red overdrive sub-pixel data; and the overdrive pixel data is obtained according to the green, the blue, and the red overdrive sub-pixel data. The overdrive circuit of claim 11, wherein the step of generating the red overdrive sub-pixel data comprises: Determining an intermediate sub-pixel data according to the first and second red sub-pixel data; determining the first pixel data according to the first red, the first green, and the first blue sub-pixel data Whether a face image condition is satisfied; and when the first pixel data satisfies the face image condition, setting a first gain and thereby amplifying the intermediate sub-pixel data to generate the red overdrive sub-pixel data, Wherein the value of the first gain is greater than one. The overdrive circuit of claim 12, wherein when the first pixel data does not satisfy the face image condition, setting the first gain to a value of 1, thereby not including the intermediate pixel data Zoom in. The overdrive circuit of claim 12, wherein the step of determining whether the first pixel data satisfies the face image condition comprises: gray scale according to the first red color and the first green sub-pixel data Calculating a first grayscale value parameter; calculating a second grayscale value parameter according to the grayscale value of the first red and the first blue subpixel data; determining whether the first grayscale value parameter falls in a a first parameter interval, and determining whether the second grayscale value parameter falls within a second parameter interval; when the first grayscale value parameter falls within the first parameter interval or the second grayscale value parameter falls in the first In the two parameter interval, determining that the first pixel data satisfies the facial image condition; and when the first grayscale value parameter falls outside the first parameter interval and the second grayscale value parameter falls in the second Judging the first when outside the parameter interval The pixel data does not satisfy the face image condition. The overdrive circuit of claim 12, wherein the step of generating the red overdrive sub-pixel data further comprises: according to the second red, the second green, and the second blue sub-pixel data, Determining whether the second pixel data satisfies a face image condition; and when the second pixel data satisfies the face image condition, setting a second gain and thereby amplifying the intermediate sub-pixel data to generate the red The sub-pixel data is overdriven, wherein the value of the first gain is greater than one. The overdrive circuit of claim 15, wherein when the second pixel material does not satisfy the face image condition, setting the second gain to a value of 1, thereby not including the intermediate pixel data Zoom in. The overdrive circuit of claim 15, wherein the step of determining whether the first pixel data satisfies the facial image condition comprises: gray scale according to the second red and the second green sub-pixel data Calculating a first grayscale value parameter; calculating a second grayscale value parameter according to the grayscale value of the second red and the second blue subpixel data; determining whether the first grayscale value parameter falls in a a first parameter interval, and determining whether the second grayscale value parameter falls within a second parameter interval; when the first grayscale value parameter falls within the first parameter interval or the second grayscale value parameter falls in the first In the two parameter interval, determining that the second pixel data satisfies the face image condition; and when the first gray level value parameter falls outside the first parameter interval and the When the second gray scale value parameter falls outside the second parameter interval, it is determined that the second pixel data does not satisfy the face image condition. The overdrive circuit of claim 11, wherein the step of generating the red overdrive sub-pixel data comprises: finding an intermediate sub-pixel data according to the first and second red sub-pixel data; Determining, according to the second red, the second green, and the second blue sub-pixel data, whether the second pixel data satisfies a face image condition; and when the second pixel data satisfies the face image condition And setting a second gain and then amplifying the intermediate sub-pixel data to generate the red overdrive sub-pixel data, wherein the first gain has a value greater than one. The overdrive circuit of claim 18, wherein when the second pixel material does not satisfy the face image condition, setting the second gain to a value of 1, thereby not including the intermediate pixel data Zoom in. The overdrive circuit of claim 18, wherein the step of determining whether the first pixel data satisfies the facial image condition comprises: gray scale according to the second red and the second green sub-pixel data Calculating a first grayscale value parameter; calculating a second grayscale value parameter according to the grayscale value of the second red and the second blue subpixel data; determining whether the first grayscale value parameter falls in a a first parameter interval, and determining whether the second grayscale value parameter falls within a second parameter interval; when the first grayscale value parameter falls within the first parameter interval or the second When the grayscale value parameter falls in the second parameter interval, determining that the second pixel data satisfies the facial image condition; and when the first grayscale value parameter falls outside the first parameter interval and the second gray When the order value parameter falls outside the second parameter interval, it is determined that the second pixel data does not satisfy the face image condition.