TWI616859B - Pixel driving method and panel driving circuit - Google Patents

Abstract

A pixel driving method is used to drive a display panel. The display panel has a first pixel. The method includes the following steps. Receives an input grayscale value, which defines the saturation. According to the input grayscale value, a first corresponding value corresponding to the first pixel is set. The first weight and the second weight are set according to the saturation, and the sum of the first weight and the second weight is a fixed value. The first pixel is driven according to a first output grayscale value, and the first output grayscale value is equal to a sum of a product of the first weight and the input grayscale value and a product of the second weight and the first corresponding value. Wherein, when the saturation is greater than the first critical value, the value of the first weight increases as the value of the saturation increases, and the maximum value of the first weight is less than 0.8.

Description

Pixel driving method and panel driving circuit

The present invention relates to a pixel driving method, and more particularly, to a pixel driving method for improving a color shift phenomenon.

High contrast and wide viewing angle are the current development trends of large-screen TVs. The angle of view of a general television is limited. When it exceeds a certain viewing angle, the viewer's vision will produce color distortion and brightness differences. At present, many TV manufacturers are committed to the development of wide-view technology of LCD TVs, which divides liquid crystal molecules in the same pixel area into multiple different alignment domains, that is, multi-domain, so as to achieve wide The display effect of the viewing angle.

However, due to the optical characteristics of liquid crystals, such a wide-viewing-angle liquid crystal display panel may experience color washout under different viewing angles. In order to improve the color shift phenomenon, the wide viewing angle liquid crystal display panel further defines pixels as a plurality of sub-pixels, and uses a spatial domain compensation technology to differentiate the output characteristics of the gamma curve between the sub-pixels. Although the color shift phenomenon is effectively improved, the color difference between the pixels driven by the same grayscale value occurs due to the different chromaticity and brightness between the sub-pixels, which makes the liquid crystal display panel display The uniform color block image shown in the image will also have a grid pattern (Mesh). In addition, because the spatial domain compensation technology is used to differentiate the sub-pixels, the viewer may feel the discontinuity of the picture visually.

The present invention relates to a pixel driving method for improving image quality in a spatial domain compensation technology.

According to an aspect of the present invention, a pixel driving method is provided for driving a display panel. The display panel has a first pixel. The method includes the following steps. Receives an input grayscale value, which defines the saturation. According to the input grayscale value, a first corresponding value corresponding to the first pixel is set. The first weight and the second weight are set according to the saturation, and the sum of the first weight and the second weight is a fixed value. The first pixel is driven according to a first output grayscale value, and the first output grayscale value is equal to a sum of a product of the first weight and the input grayscale value and a product of the second weight and the first corresponding value. Wherein, when the saturation is greater than the first critical value, the value of the first weight increases as the value of the saturation increases, and the maximum value of the first weight is less than 0.8.

According to another aspect of the present invention, a panel driving circuit is provided for electrically coupling with a display panel. The display panel has a first pixel. The panel driving circuit includes a gray level generating circuit and a driving circuit. The gray level value generating circuit is used for receiving the input gray level value, and setting a first corresponding value corresponding to the first pixel according to the input gray level value. This input gray level value defines the saturation. The driving circuit is configured to set the first weight and the second weight according to the saturation, and drive the first pixel according to the first output gray level value. The first output gray level value is equal to the product of the first weight and the input gray level value and the second weight. Corresponds to the first The sum of the products of the values. The sum of the first weight and the second weight is a fixed value. When the saturation is greater than the first threshold, the value of the first weight increases as the value of the saturation increases, and the maximum value of the first weight is less than 0.8.

In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are described in detail below in conjunction with the accompanying drawings:

200‧‧‧ panel drive circuit

210‧‧‧Grayscale value generating circuit

220‧‧‧Drive circuit

300‧‧‧ display panel

D1‧‧‧First corresponding value

N1‧‧‧ first critical value

N2‧‧‧ second critical value

S100‧‧‧ receives input grayscale value

S102‧‧‧ Set a first corresponding value corresponding to the first pixel according to the input gray level value

S104‧‧‧ Set first weight and second weight based on saturation

S106‧‧‧ drives the first pixel according to the first output grayscale value, and the first output grayscale value is equal to the sum of the product of the first weight and the input grayscale value and the product of the second weight and the first corresponding value

w _M ‧‧‧ the maximum value of the first weight

Xin‧‧‧Enter the grayscale value

Z1‧‧‧ the first output grayscale value

FIG. 1 is a schematic diagram of a pixel according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a pixel driving method according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of a panel driving circuit according to a first embodiment of the present invention.

FIG. 4 is a schematic diagram showing the relationship between the first weight and the saturation according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram of a spatial filter according to a first embodiment of the present invention.

Compared with Twisted Nematic (TN) liquid crystals, vertical alignment liquid crystals (Vertical Alignment, VA) have higher contrast and wider viewing angles, which is the mainstream technology used in large-screen LCD TVs. However, the VA liquid crystal display may have the disadvantage of large viewing angle color whitening. In recent years, with the advancement of multi-domain technology, the disadvantage of large viewing angle can be effectively reduced.

For example, using the spatial domain technology, the pixels of the panel can be divided into two forms: the main sub-pixel and the sub-sub-pixel. The main pixels (Main and Sub) have different Gamma curve output characteristics. Although the Gamma curves of the Main and Sub sub-pixels at the micro level are different in the role of large viewing, the comprehensive mixing effect of Main and Sub on the macro view can effectively reduce the color deviation and improve the color quality of large viewing angles. However, due to the difference in the gamma curve between pixels, there may be a feeling of diamonds in the visual sense, or it may be easily discontinuous in the color block, causing a visually sense of fragmentation.

For example, each pixel on the panel may have a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel. FIG. 1 is a schematic diagram of a pixel according to a first embodiment of the present invention. In an embodiment, the first pixel and the second pixel may be used to display the same color block image, that is, the color block images received by the first pixel and the second pixel have the same grayscale value. The red, green, and blue sub-pixels in the first pixel and the second pixel are respectively driven by the MSM type and the SMS type, where M represents the Main subpixel and S represents the Sub subpixel. In the following description, a pixel having an MSM type is referred to as an A pixel, and a pixel having an SMS type is referred to as a B pixel.

Since the main sub-pixel and the sub-pixel use different gamma curves, the effect of reducing color shift can be achieved in this way. Table 1 shows an example of using the spatial domain technology to differentiate the Main sub-pixel and the Sub sub-pixel for the same input grayscale value, and uses the A pixel and B pixel structures described above. The values shown in Table 1 are calculated according to the Gamma curve function. In hardware implementation, you can also use a lookup table to store the grayscale values and output the values of the Main and Sub subpixels. The relationship can be obtained through the table lookup method and interpolation operation, as shown in Table A and B pixels.

In one embodiment, the grayscale values of the A pixel and the B pixel can be adjusted according to the saturation corresponding to the input grayscale value to obtain a better display effect. Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart of a pixel driving method according to the first embodiment of the present invention. The pixel driving method is used to drive a display panel. The display panel has a first pixel. The pixel driving method includes the following steps.

Step S100: Receive an input grayscale value Xin, and this input grayscale value Xin defines the saturation S.

Step S102: Set a first corresponding value D1 corresponding to the first pixel according to the input grayscale value Xin. Step S104: Set the first weight w1 and the second weight w2 according to the saturation S, and the sum of the first weight w1 and the second weight w2 is a fixed value.

Step S106: The first pixel is driven according to the first output grayscale value Z1. The first output grayscale value Z1 is equal to the product of the first weight w1 and the input grayscale value Xin and the product of the second weight w2 and the first corresponding value D1. Add up. When the saturation S is greater than the first critical value N1, the value of the first weight w1 increases as the value of the saturation S increases, and the maximum value w _M of the first weight w1 is less than 0.8.

With reference to the pixel driving method shown in FIG. 2, FIG. 3 shows a schematic diagram of a panel driving circuit according to the first embodiment of the present invention. The panel driving circuit 200 is electrically coupled to the display panel 300. The display panel 300 has a first pixel. The panel driving circuit 200 includes a grayscale value generating circuit 210 and a driving circuit 220. The grayscale value generating circuit 210 is configured to receive an input grayscale value Xin and set a first corresponding value D1 corresponding to the first pixel according to the input grayscale value Xin. This input grayscale value Xin defines the saturation S. The driving circuit 220 may be configured to calculate the saturation S corresponding to the input grayscale value Xin, and set the first weight w1 and the second weight w2 according to the saturation S. The driving circuit 220 is further configured to drive the first pixel according to the first output grayscale value Z1. The first output grayscale value Z1 is equal to the product of the first weight w1 and the input grayscale value Xin and the product of the second weight w2 and the first corresponding value D1. The driving circuit 220 can calculate the first output grayscale value Z1. . The sum of the first weight w1 and the second weight w2 is a fixed value. When the saturation S is greater than the first critical value N1, the value of the first weight w1 increases as the value of the saturation S increases, and the first The maximum value w _M of the weight w1 is less than 0.8.

Taking the example that the pixel has a red subpixel, a green subpixel, and a blue subpixel, the saturation S defined by the input grayscale value Xin can be calculated according to the following formula, where Rin, Gin, and Bin are the input grayscale values Xin, respectively. Enter the grayscale value for red, grayscale value for green, and grayscale value for blue.

Taking the values in Table 1 as an example, the input grayscale value of the first column (192,8,8) corresponds to a saturation S of 0.96, which is a high saturation; the input grayscale value of the second column (192,96, 96), the corresponding saturation S is 0.5, which belongs to the middle saturation; the input gray level value (192,192,192) in the third column, and the corresponding saturation S is 0, which belongs to the low saturation. The calculation of the saturation S may be performed by the driving circuit 220, for example.

Step S102 sets a first corresponding value D1 corresponding to the first pixel according to the input grayscale value Xin. If the input grayscale value Xin has a red input grayscale value, a green input grayscale value, and a blue input grayscale value, as shown in Table 1, the first corresponding value D1 may be the value of A pixel or B shown in Table 1. The pixel value; if the input grayscale value Xin has a single grayscale value, the first corresponding value D1 may be the value of one of the sub-pixels of the A pixel or the B pixel. Step S102 may be calculated according to the function of the Gamma curve (different Gamma curves are used for the Main subpixel and the Sub subpixel), or a comparison table may be established in advance to store the relationship between the grayscale value and the first corresponding value D1.

If the first pixel is a single sub-pixel and has a single gray level value, when the first pixel is displayed as the main pixel (Main), the first corresponding value D1 is the first main corresponding value corresponding to the main Gamma curve; when the first pixel is When displayed as an auxiliary pixel (Sub), the first corresponding value D1 is the first auxiliary corresponding value corresponding to the auxiliary Gamma curve. The main gamma curve is different from the auxiliary gamma curve. If the first pixel has multiple sub-pixels, for example, including three gray-scale values of RGB, it may be displayed in the A-pixel (MSM) type or the B-pixel (SMS) type as described above. When the first pixel is displayed as an A pixel (MSM, which can be defined as the main pixel), the R gray level value corresponds to the main corresponding value of the main Gamma curve, and the G gray level value corresponds to the main Gamma curve. Auxiliary corresponding value, the B gray level value corresponds to the main corresponding value of the main gamma curve; when the first pixel is displayed as a B pixel (SMS, can be defined as an auxiliary pixel), the R gray level value thereof corresponds to the auxiliary corresponding value of the auxiliary gamma curve The G gray level value corresponds to the main corresponding value of the main Gamma curve, and the B gray level value corresponds to the auxiliary corresponding value of the auxiliary Gamma curve.

Step S102 is performed by, for example, a gray-scale value generating circuit 210. The gray-scale value generating circuit 210 is, for example, a look-up table circuit that can perform table lookup and interpolation operations. The circuit of the formula operation can be calculated by the Gamma curve function to obtain the first corresponding value D1. In the following description, the step of converting step S102 from the input grayscale value Xin to the first corresponding value D1 may be referred to as a spatial domain (SD) step.

Step S104 sets a first weight w1 and a second weight w2 according to the saturation S. For example, the first output grayscale value Z1 corresponding to the first pixel may be determined according to the following: (1) the first corresponding value D1 after the SD step, and (2) the input before the SD step Grayscale value Xin. The first weight w1 and the second weight w2 may respectively correspond to the proportions of the input grayscale value Xin and the first corresponding value D1. The sum of the first weight w1 and the second weight w2 is a fixed value. In one embodiment, the sum of the first weight w1 and the second weight w2 is 1. Of course, the present invention is not limited to this. The first weight w1 and the second weight The sum of w2 can also be other constants.

Step S106 drives the first pixel according to the first output grayscale value Z1. The first output grayscale value Z1 is equal to the product of the first weight w1 and the input grayscale value Xin and the product of the second weight w2 and the first corresponding value D1. Total, that is, Z1 = w1 × Xin + w2 × D1, and drives the first pixel according to the calculated output grayscale value Z1. Steps S104 and S106 can be performed by the driving circuit 220.

The first weight w1 is set according to the saturation S. When the saturation S is greater than the first critical value N1 (for example, N1 = 0.7), it may be referred to as a high saturation interval. In the high-saturation interval, the value of the first weight w1 increases as the value of the saturation S increases, and the maximum value w _M of the first weight w1 is less than 0.8. That is, when the saturation S reaches the maximum saturation (for example, the saturation S = 1), the maximum value w _M reached by the first weight w1 is less than 0.8, which means that when the maximum saturation is reached, the first output grayscale value Z1 is determined by The original input grayscale value Xin of the part and the first corresponding value D1 of the part (with the SD step) are composed. The value range of the maximum value w _M of the first weight w1 is, for example, 0.6 to 0.8.

Taking the data in Table 1 as an example, the input grayscale value Xin is (192,8,8), and the saturation S = 0.96. If the corresponding first weight w1 = 0.7 and the second weight w2 = 0.3, the corresponding A pixel ( MSM) first output grayscale value Z1 = w1 × Xin + w2 × D1 = 0.7 × (192,8,8) + 0.3 × (228,3,11) = (203,7,9), corresponding to B The first output grayscale value of the pixel (SMS) is Z1 = 0.7 × (192,8,8) + 0.3 × (150,12,3) = (179,9,7). It can be seen that after adjustment of the first weight w1 and the second weight w2, the color difference between the first output grayscale value Z1 of the A pixel and the first output grayscale value Z1 of the B pixel is reduced (compared to the first pixel w1 A color difference between a corresponding value D1 and the first corresponding value D1 of the B pixel).

FIG. 4 is a schematic diagram showing the relationship between the first weight w1 and the saturation S according to the first embodiment of the present invention. In the following embodiments, the range of the first weight w1 and the second weight w2 is 0 to 1, and the sum of the first weight w1 and the second weight w2 is 1. However, these numbers are only exemplary, and other constants may be used. . The range of the saturation S is, for example, 0 to 1. When the saturation S is greater than the high saturation interval of the first critical value N1, the value of the first weight w1 increases as the value of the saturation S increases. When the saturation S is equal to When the saturation maximum value (1 in this example), the saturation degree S corresponds to the maximum value w _M (for example, 0.7) of the first weight w1. In this embodiment, the value of the first weight w1 in the high-saturation interval increases linearly with the value of the saturation S, but is not limited thereto, and the value of the first weight w1 may also be a value with the saturation S The non-linearity increases.

When the saturation S is less than the second critical value N2 (for example, N2 = 0.3), it can be called a low saturation interval. The value of the first weight w1 decreases as the value of the saturation S increases, such as a linear decrease, but also Not limited to this, the second critical value N2 is smaller than the first critical value N1. When the saturation S is equal to the minimum saturation (0 in this example), the first weight w1 is substantially equal to the maximum weight (1 in this example). The maximum value of this weight is equal to the fixed value of the sum of the first weight w1 and the second weight w2. When the saturation S is 0, the first weight w1 = 1 and the second weight w2 = 0 are equivalent to not performing the SD step, and the first output grayscale value Z1 is equal to the original input grayscale value Xin.

In this embodiment, when the saturation S is between the second critical value S2 and the first critical value S1, it is called a middle saturation interval, and the first weight w1 is substantially equal to the minimum weight, that is, the first weight w1 Maintain a fixed value. In one embodiment, the minimum value of the weight is equal to 0. In other embodiments, the minimum value of the weight may be other values. As shown in the example in FIG. 4, when the saturation S = 0.5, the first weight w1 = 0, and the second weight w2 = 1, it means that the first output grayscale value Z1 is equal to the first corresponding value D1. In its In his embodiment, in the middle saturation interval, the first weight w1 may also change linearly with the value of the saturation S. Here, the first weight w1 is maintained at a fixed value as an example.

As shown in FIG. 4, the relationship between the saturation S and the first weight w1 can be expressed by the following formula: When 0 S N2

w1 = 0 when N2 S N1

When N1 S 1, where w _M represents the maximum value of the first weight w1 in the high saturation interval.

The first weight w1 and the second weight w2 are set according to the saturation S, which may be calculated according to the foregoing multiple expressions, or in another embodiment, the correspondence between the saturation S and the first weight w1 may be stored in the search. In the table. For example, if the relationship between the first weight w1 and the saturation S is not linearly related in each saturation interval, a lookup table may be used to store the corresponding relationship in advance. The driving circuit 220 shown in FIG. 3 may include a lookup table storing a correspondence between the first weight w1 and the saturation S, or may calculate the first weight w1 based on the saturation S according to the foregoing multiple expressions.

As described above, after the first weight w1 and the second weight w2 are adjusted, in the high-saturation interval and the low-saturation interval, because the first weight w1> 0, the first output grayscale values Z1 and B of the A pixel The color difference between the pixel's first output grayscale value Z1 is reduced (compared to the color difference between the first corresponding value D1 of the A pixel and the first corresponding value D1 of the B pixel); in the middle saturation range, because the first weight w1 = 0, the color difference between the first output grayscale value Z1 of the A pixel and the first output grayscale value Z1 of the B pixel remains unchanged (compared to the first corresponding value D1 of the A pixel and the first corresponding value D1 of the B pixel) Color difference). Dangxian When pixels of the same color block image are driven by A pixel and B pixel respectively by performing the SD step, the color shift phenomenon of the color block image at a large viewing angle can be improved, but the grid speckle phenomenon of the color block image is more obvious. Because the human eye is less sensitive to the viewing roles of high and low saturation colors, by reducing the display difference between A and B pixels in the high and low saturation intervals, not only can the color shift phenomenon be reduced at a large viewing angle, but also Can improve the grid speckle problem of color patch images.

On the other hand, when the color saturation in the image frame has the characteristic of high-frequency switching, and when the viewer views the image frame at a close distance, a visual discontinuity may occur. In order to maintain the continuity of the image when viewing at close range, the solution is to increase the proportion of high-saturation color to perform the SD step, that is, set the maximum value of the first weight w _M in the high-saturation interval corresponding to the foregoing content is 0.8 or less . In this way, when watching from a close distance, the grid pattern generated by the SD step can be seen to a certain extent, and the continuity of the picture is maintained.

As shown in Figure 4, the corresponding relationship between the first weight w1 and the saturation S, the parameter settings (such as the maximum value of the first weight w1 in the high saturation interval w _M ) can be set according to human visual perception, here can be Contrast Sensitivity was used for analysis. For a given Gamma curve, a specific first display panel size (for example, a 60-inch panel) and a specific viewing distance (for example, within 60 cm from the panel) are simulated and experimented with different maximum weights w _M. Calculate the contrast sensitivity corresponding to the display image generated by different first weighted maximum values w _M in the high-saturation interval. Find the first weighted maximum value w _M that can make the contrast sensitivity less than a critical value, so that the human eye can see the grid pattern while maintaining the continuous picture. After simulation and experiment, it can be obtained that the maximum value of the first weight w _{M is} less than 0.8, for example, it can be a value of 0.6 to 0.8.

In the low-saturation range, because most of the low-saturation colors are located in the visible area of the grid pattern, the low-saturation color image is less discontinuous. Therefore, as shown in Figure 4, when the saturation S is close to 0, The first weight w1 is close to 1, which is equivalent to hardly performing the SD step, and the picture can be maintained continuously.

According to the above method, the problem of discontinuity in large blocks of the display screen can be solved, and for a situation where a small number of pixels change too quickly in a small area and the screen is too sharp, a spatial filter can be used. In an embodiment, the display panel 300 shown in FIG. 3 further has a plurality of second pixels, and the second pixels are adjacent to the first pixels. The pixel driving method may further include: using a spatial filter to correspond to the second pixels. The first weight w1 adjusts the first weight w1 corresponding to the first pixel. The type of spatial filter used is not limited. In one embodiment, the spatial filter is a smoothing filter, such as a low-pass filter, to suppress excessively high-frequency components and reduce sharpness, so that each pixel corresponds to the first A weight w1 changes smoothly.

FIG. 5 is a schematic diagram of a spatial filter according to a first embodiment of the present invention. The spatial filter used in this example is a 3 × 3 mean filter. As shown in FIG. 5, the first weight w1 corresponding to the first pixel in the middle is, for example, 1, and the first weight w1 corresponding to the surrounding 8 neighboring pixels (second pixels) is as shown in FIG. 5. It can be seen that the first weight between each pixel changes drastically. After 3 × 3 mean filter processing (e.g. calculating the first weight corresponding to 9 pixels centered on the first pixel w1), the first weight w1 corresponding to the first pixel is changed to 0.2, which slows down the excessively sharp first weight change in the picture.

The spatial filter used in this example is only an illustrative illustration. In other embodiments, the size of the spatial filter is not limited to 3 × 3, and may be other sizes, or it may be up, down, left, and right according to the first pixel. The pixels are spatially filtered, and the shape is not limited to a square. In addition, the spatial filter is not limited to a mean filter, and other smoothing calculation methods can be used. For example, a spatial filter that gives different weights to pixels that are not at the same distance from the first pixel, or for example, a median space can be used. filter.

As described in the above embodiments of the present invention, the weight of the steps of using the spatial domain technology can be determined according to the color saturation of the image, which not only improves the color shift phenomenon at a large viewing angle, but also improves the grid speckle problem of the color block image. The maximum value of the first weight set in the high-saturation section can maintain the continuity of the image frame when the viewer watches from a short distance. In addition, the application of spatial filter processing can slow down the excessively sharp first weight change and effectively display the continuity of the picture.

In summary, although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

S100‧‧‧ receives input grayscale value

S102‧‧‧ Set a first corresponding value corresponding to the first pixel according to the input gray level value

S104‧‧‧ Set first weight and second weight based on saturation

S106‧‧‧ drives the first pixel according to the first output grayscale value, and the first output grayscale value is equal to the sum of the product of the first weight and the input grayscale value and the product of the second weight and the first corresponding value

Claims (20)

A pixel driving method for driving a display panel having a first pixel. The method includes: receiving an input grayscale value, the input grayscale value defining a saturation; and setting the input grayscale value according to the input grayscale value. A first corresponding value corresponding to the first pixel; setting a first weight and a second weight according to the saturation; the sum of the first weight and the second weight is a fixed value; according to a first output gray scale Value drives the first pixel, the first output grayscale value is equal to the product of the first weight and the input grayscale value and the sum of the product of the second weight and the first corresponding value; and when the saturation When the degree is greater than a first critical value, the value of the first weight increases as the value of the saturation increases, and the maximum value of the first weight is less than 0.8. The pixel driving method according to claim 1, wherein when the saturation is equal to a saturation maximum, the saturation corresponds to a maximum of the first weight. The pixel driving method according to claim 1, wherein when the saturation is less than a second threshold, the value of the first weight decreases as the value of the saturation increases, and the second threshold is smaller than the First critical value. The pixel driving method according to claim 3, wherein when the saturation is equal to a saturation minimum, the first weight is substantially equal to a weight maximum. The pixel driving method according to claim 4, wherein the maximum value of the weight is equal to the fixed value. The pixel driving method according to claim 3, wherein when the saturation is between the second threshold and the first threshold, the first weight is substantially equal to a minimum weight. The pixel driving method according to claim 6, wherein the minimum value of the weight is equal to zero. The pixel driving method according to claim 1, wherein in the step of setting the first corresponding value corresponding to the first pixel according to the input grayscale value, the method includes: when the first pixel is displayed as a main For pixels, the first corresponding value is a first major corresponding value corresponding to at least one main Gamma curve; and when the first pixel is displayed as an auxiliary pixel, the first corresponding value is corresponding to at least one auxiliary Gamma curve One of the first auxiliary corresponding values. The pixel driving method according to claim 1, wherein the display panel further has a plurality of second pixels, and the second pixels are adjacent to the first pixel. The pixel driving method further includes: using a spatial filter basis The first weights corresponding to the second pixels and the first weights corresponding to the first pixels adjust the first weights corresponding to the first pixels. The pixel driving method according to claim 9, wherein the spatial filter is a smoothing filter. A panel driving circuit is used for electrically coupling with a display panel. The display panel has a first pixel. The panel driving circuit includes: a grayscale value generating circuit for receiving an input grayscale value, and according to the An input grayscale value sets a first corresponding value corresponding to the first pixel, the input grayscale value defines a saturation; and a driving circuit for setting a first weight and a second weight according to the saturation, and Driving the first pixel according to a first output grayscale value, the first output grayscale value being equal to a sum of a product of the first weight and the input grayscale value and a product of the second weight and the first corresponding value ; Wherein the sum of the first weight and the second weight is a fixed value, and when the saturation is greater than a first critical value, the value of the first weight increases as the value of the saturation increases, and The maximum value of the first weight is less than 0.8. The panel driving circuit according to item 11, wherein when the saturation is equal to a saturation maximum, the saturation corresponds to the maximum of the first weight. The panel driving circuit according to claim 11, wherein when the saturation is less than a second threshold, the value of the first weight decreases as the value of the saturation increases, and the second threshold is smaller than the First critical value. The panel driving circuit according to claim 13, wherein when the saturation is equal to a saturation minimum, the first weight is substantially equal to a weight maximum. The panel driving circuit according to claim 14, wherein the maximum value of the weight is equal to the fixed value. The panel driving circuit according to claim 13, wherein when the saturation is between the second threshold and the first threshold, the first weight is substantially equal to a minimum weight. The panel driving circuit according to claim 16, wherein the minimum value of the weight is equal to zero. The panel driving circuit according to claim 11, wherein when the first pixel is displayed as a main pixel, the grayscale value generating circuit sets the first corresponding value to correspond to one of at least one main gamma curve. Main corresponding value; when the first pixel is displayed as an auxiliary pixel, the grayscale value generating circuit sets the first corresponding value to a first auxiliary corresponding value corresponding to at least one auxiliary gamma curve. The panel driving circuit according to claim 11, wherein the display panel further includes a plurality of second pixels, the second pixels are adjacent to the first pixel, and the driving circuit is further configured to use a spatial filter according to the The first weights corresponding to the second pixels and the first weights corresponding to the first pixels adjust the first weights corresponding to the first pixels. The panel driving circuit according to claim 19, wherein the spatial filter is a smoothing filter.