CN114519967A - Source driving device, control method thereof and display system - Google Patents

FIG. 2 is a schematic diagram showing a partial structure of the

1 in FIG. 1;

FIG. 5 is a diagram showing an embodiment of a partial structure of the

1 in FIG. 4;

FIG. 7 is a schematic diagram of another embodiment of a partial structure of the

1 in FIG. 4;

FIG. 1 is a schematic diagram of a source driver in the related art, and FIG. 2 is a schematic diagram of a part of the structure of the

1 in FIG. 1. Fig. 2 illustrates two columns of pixels. As shown in fig. 1 to 2, the source driving apparatus may include a serial-

3, a

4, a

1, a digital-to-

2, an

5, and a

6. The

1 may include a two-way switch 14 and an

13.

In a specific implementation process, the input terminal of the serial-

3 is electrically connected to the pixel output terminal of the

10. The output end of the serial-

3 is electrically connected with the input end of the

4. The output of the

4 is electrically connected to a first input of a two-way switch 14. The mode control terminal of the

10 is electrically connected to a second input terminal of the two-way switch 14. A first output terminal of the two-way switch 14 is electrically connected to a third input terminal of the digital-to-

2. A second output terminal of the two-way switch 14 is electrically connected to an input terminal of the

13. The output end of the average

13 is electrically connected with the first input end of the digital-to-

2. The output end of the digital-to-

2 is electrically connected with the corresponding sub-pixel through the

6. The output end of the

5 is electrically connected with the second input end of the digital-to-

2.

The operating principle of the

1 is as follows: when the mode control end of the external control circuit inputs a first analog signal '0', the subpixels in two adjacent columns do not perform mean value operation, the first output end of the double-pass switch 14 is conducted with the digital-to-

2, and the pixel value input by the output end of the digital-to-

2 to the corresponding subpixel is consistent with the pixel value of the subpixel input by the pixel output end of the external control circuit. When a first analog signal '1' is input to a mode control end of the external control circuit, the subpixels of two adjacent columns perform mean value operation, the second output end of the double-pass switch 14 is conducted with the mean

13, the mean

13 obtains the subpixel mean value of the pixels of two adjacent columns, the subpixel mean value is output to the digital-to-

2, and the digital-to-

2 outputs the subpixel mean value to the corresponding subpixels.

Based on the working principle of the

1, a pixel corresponding to the display panel can be expanded into two expansion pixels, wherein one expansion pixel displays with the pixel value of the sub-pixel input by the pixel output end of the

10, that is, the same as the sub-pixel value of the original pixel, and the other expansion pixel displays with the sub-pixel average value of two adjacent columns of pixels, so that two adjacent columns of pixels are subjected to transition processing, and the display of the display panel is smooth. As shown In fig. 2, one of the extended pixels receives output signals of O _1 to O _3, which are identical to the pixel values (In _1 to In _3) of the sub-pixels input from the pixel output terminal of the external control circuit, and the other extended pixel receives output signals of O _4 to O _6, which have pixel values In _1& In _4, In _2& In _5, and In _3& In _ 6.

Fig. 3 is a diagram illustrating a display effect of a display panel driven by a source driving apparatus according to the related art. As shown in fig. 3, the pixels output by the pixel output terminal of the external control circuit may be

1 to 6, and after the pixels are expanded by the

1, the pixels corresponding to the display panel may be expanded to 12 pixels 1 'to 12'. Wherein, the

1 corresponds to the pixel 1 'and the pixel 2', the pixel 1 'maintains the pixel value corresponding to the

1, and the pixel 2' adopts the mean value for transition, so that the comparison between the pixel 1 'and the pixel 3' is smooth. The other pixels are not described one by one here.

However, when there are regions with large row differences on the display screen, the purpose is to form contrast and highlight effects, and if the transition processing is still performed at this time, the contrast effect is weakened, so that the image quality is deteriorated. As shown in fig. 3, the difference between the

1 and the

2 is large, and in this case, the two pixels need to be displayed in a protruding manner, but in the related art, since the operation manner of the source driving device is fixed, the average value operation is performed and then output, which provides the effect shown in fig. 3, and thus the contrast effect of the

1 and the

2 is weakened, and the image quality is deteriorated.

FIG. 4 is a schematic diagram of a source driver according to the present invention, and FIG. 5 is a schematic diagram of an embodiment of a partial structure of the

1 shown in FIG. 4. As shown in fig. 4 to 5, the source driving apparatus is different from the source driving apparatus corresponding to fig. 1 and 2 in that an external control circuit can input a preset threshold corresponding to a sub-pixel of each column of pixels, and the

1 adaptively adds a relevant device.

Specifically, the

1 may include a

11 for driving each sub-pixel in each column of pixels, a switching

12 for each sub-pixel, an averaging

13 for each sub-pixel, and a digital-to-

2. The input end of the

11 is electrically connected with the output end of the

10; the output end of the

11 is electrically connected with the input end of the

12 and the input end of the mean

13; the output end of the

12 and the output end of the mean

13 are respectively electrically connected with the input end of the digital-to-

2; the output end of the digital-to-

2 is used for being electrically connected with the sub-pixels of the pixels of each column.

It should be noted that, the input terminal of the

1 mentioned herein is electrically connected to the output terminal of the

10, which may mean that the two are directly connected, or another device may be disposed between the two for performing conversion connection, as shown in fig. 4, if the source driving apparatus includes the serial-

3 and the

4; a first input terminal of the difference operation sub-circuit 111 is electrically connected to the pixel output terminal through the serial-

3 and the

4. The first input end of the difference operation sub-circuit 111, the

4, the serial-

3, and the pixel output end are connected in sequence.

In a specific implementation process, the

11 is configured to receive a sub-pixel value of each column of pixels and a preset threshold corresponding to the sub-pixel of each column of pixels, which are input by the

10, and detect whether a pixel difference between the sub-pixel values of two adjacent columns of pixels is greater than the preset threshold; if the pixel difference of the sub-pixel values of two adjacent columns of pixels is larger than a preset threshold value, a signal '0' can be output, and the switching circuit is controlled to be switched on; if the pixel difference between the sub-pixel values of two adjacent columns of pixels is greater than the preset threshold, a signal "1" can be output, and the mean

13 is controlled to be switched on. Wherein, the

10 may include a timing control sub-circuit; the time sequence control sub-circuit is used for outputting the sub-pixel value of each column of pixels and the preset threshold value corresponding to the sub-pixel of each column of pixels. Alternatively, the

10 includes a timing control sub-circuit and a threshold control sub-circuit; the time sequence control sub-circuit is used for outputting sub-pixel values of pixels of each column; the threshold control sub-circuit is used for outputting preset thresholds corresponding to sub-pixels of each row of pixels. That is to say, the preset threshold corresponding to the sub-pixel of each column of pixels may be output by the timing control sub-circuit, or may be output by separately setting a threshold control sub-circuit, which is not limited in this embodiment.

The

12 is configured to be turned on when the pixel difference is greater than the preset threshold, and output a sub-pixel value of a pixel in the first order of two adjacent columns of pixels to the digital-to-

2, so that the pixel in the first order of the display panel is expanded to obtain two expanded pixels, and the sub-pixel value of the expanded pixel in the second order of the display panel is maintained, so that a salient contrast can be formed between the sub-pixel value of the pixel in the column input by the

10 and the pixel in the second order of two adjacent columns of pixels. The pixels in two adjacent columns are sorted towards the display area according to the non-display area on the appointed side of the display panel. For example, the pixels may be arranged in a left-to-right order, and the left pixels in two adjacent columns of pixels are the top-ranked pixels. The ordering order of the extended pixels is the same as described above.

The average

13 is configured to be turned on when the pixel difference is smaller than or equal to the preset threshold, and output the sub-pixel average value to the digital-to-

2 after obtaining the sub-pixel average value of two adjacent columns of pixels. In this way, after the pixels in the two adjacent columns of pixels that are sorted in the front are expanded into two expanded pixels, the expanded pixels that are sorted in the back can be displayed with the pixel mean value, so as to perform smooth display.

Based on the operating principle of the

1, a pixel corresponding to the display panel can be expanded into two expansion pixels, wherein one of the expansion pixels displays the pixel value of the sub-pixel input by the pixel output end of the

10, that is, the pixel value is the same as the sub-pixel value of the original pixel, and the other expansion pixel displays the pixel value of the sub-pixel input by the pixel output end of the external control circuit when the difference between two adjacent columns of pixels is large, so that the highlighted contrast is performed. When the difference between two adjacent columns of pixels is small, the other extended pixel is displayed by using the average value of the sub-pixels of the two adjacent columns of pixels so as to perform transition processing, so that the display of the display panel is smooth. As shown In fig. 3, another extended pixel receives the output signals of O _4 to O _6, and when the difference between two adjacent pixels In two columns is small, the pixel values are In _1& In _4, In _2& In _5, and In _3& In _ 6; when the difference between two adjacent pixels In two columns is large, the pixel values are In _1, In _2 and In _ 3.

Fig. 6 is a diagram showing the display effect of the display panel driven by the source driver according to the present invention, as shown in fig. 6, the pixels output by the pixel output terminal of the

10 may be

1 to 6, and after being expanded by the

1, the pixels corresponding to the display panel may be expanded to 12 pixels 1 'to 12'. Wherein, the

1 corresponds to the pixel 1 'and the pixel 2', the pixel 1 'and the pixel 2' both maintain the pixel value corresponding to the

1, and the pixel 3 'and the pixel 4' both maintain the pixel value corresponding to the

2, so that the contrast between the

1 and the

2 is highlighted.

3 corresponds to pixel 5 'and pixel 6', pixel 5 'maintains the pixel value corresponding to

3, and pixel 6' adopts the mean pixel so that the comparison between pixel 6 'and pixel 7' is smooth. The other pixels are not described one by one here.

The source driving device of the invention sets a corresponding preset threshold value aiming at the sub-pixels of each row of pixels, controls the

12 to be conducted when the pixel difference of the two rows of sub-pixels needing to be operated is larger than the preset threshold value, outputs the sub-pixel value of the pixel in the front order in the two adjacent rows of pixels to the digital-to-

2, controls the mean value operation to be conducted when the pixel difference of the two rows of sub-pixels needing to be operated is smaller than or equal to the preset threshold value, and outputs the sub-pixel mean value to the digital-to-

2 after obtaining the sub-pixel mean value of the two adjacent rows of pixels.

In one specific implementation, as shown in fig. 4, the

11 includes a difference operation sub-circuit 111 and a comparison sub-circuit 112; the output of the

10 comprises a pixel output and a threshold output.

A first input terminal of the difference operation sub-circuit 111 and a first input terminal of the comparison sub-circuit 112 are both used as input terminals of the

11; the output terminal of the comparison sub-circuit 112 serves as the output terminal of the

11. The first input end of the difference operation sub-circuit 111 is electrically connected with the pixel output end; a first input of the comparison sub-circuit 112 is electrically connected to the threshold output; a second input end of the comparison sub-circuit 112 is electrically connected with an output end of the difference operation sub-circuit 111; the output terminal of the comparison sub-circuit 112 is electrically connected to the input terminal of the

12 and the input terminal of the averaging

13.

The difference value operation sub-circuit 111 is used for obtaining the pixel difference of the sub-pixel values of two adjacent columns of pixels; the comparison sub-circuit 112 is configured to detect whether the pixel difference is greater than the preset threshold; when the pixel difference is larger than the preset threshold, controlling the

12 to be switched on; and when the pixel difference is smaller than or equal to the preset threshold, controlling the mean value operation circuit 7 to be conducted.

In a specific implementation process, as shown in fig. 4, the source driving apparatus of this embodiment further includes an

5 and a

6; the

5 and the

6 are respectively connected with the digital-to-

2.

FIG. 7 is a diagram showing another embodiment of the partial structure of the

1 in FIG. 4. As shown in fig. 7, the source driving device of the present embodiment may further include a multiplication circuit corresponding to each column of pixels.

The output end of the comparison sub-circuit 112 is electrically connected to the input end of the

12 and the input end of the mean

13 through the multiplication operation circuit.

The comparison sub-circuit 112 is further configured to send the detection result to the multiplication operation circuit; the multiplication operation circuit is configured to output a signal "0" when the detection result of at least one comparison sub-circuit 112 is that the pixel difference is greater than the preset threshold, control all the

12 to be turned on, and output the sub-pixel value of the pixel in the two adjacent columns of pixels that is ranked first to all the digital-to-

2; when the detection results of all the comparison sub-circuits 112 are pixel differences smaller than or equal to the preset threshold, a signal "1" is output, and all the mean

13 are controlled to be turned on, so that the mean

13 obtain the sub-pixel mean values of two adjacent columns of pixels, and then output the sub-pixel mean values to the digital-to-

2.

That is, after the and logic operation is performed on the detection results of all the comparison sub-circuits 112 by the multiplication circuit, the pixel values corresponding to the operation results are output to the digital-to-

2 according to the result of the and logic operation.

800. receiving a sub-pixel value of each column of pixels and a preset threshold corresponding to the sub-pixel of each column of pixels, which are input by an

10, through a

11;

802. controlling the

12 to be switched on, and outputting the sub-pixel value of the pixel in the front order in the two adjacent columns of pixels to the digital-to-analog conversion circuit;

803. and the average

13 is turned on, and outputs the sub-pixel average value to the digital-to-analog conversion circuit after obtaining the sub-pixel average value of two adjacent columns of pixels.

The present invention also provides a display system comprising a display panel, an

10 and the source driving device of the above embodiment.

The output end of the

10 is electrically connected with the input end of the

11 in the source driving device;

1. A source driving device is characterized by comprising a pixel detection circuit for driving each sub-pixel in each column of pixels, a switch circuit of each sub-pixel, an average value operation circuit of each sub-pixel and a digital-to-analog conversion circuit;

the input end of the pixel detection circuit is electrically connected with the output end of the external control circuit;

the output end of the pixel detection circuit is electrically connected with the input end of the switch circuit and the input end of the mean value operation circuit;

the output end of the switch circuit and the output end of the mean value operation circuit are respectively electrically connected with the input end of the digital-to-analog conversion circuit;

the output end of the digital-to-analog conversion circuit is used for being electrically connected with the sub-pixels of each column of pixels;

The pixel detection circuit is used for receiving the sub-pixel values of the pixels in each row and the preset threshold corresponding to the sub-pixels of the pixels in each row input by the external control circuit, and detecting whether the pixel difference of the sub-pixel values of the pixels in two adjacent rows is larger than the preset threshold or not;

the switch circuit is used for being switched on when the pixel difference is larger than the preset threshold value, and outputting the sub-pixel value of the pixel which is sequenced at the front in two adjacent columns of pixels to the digital-to-analog conversion circuit;

the mean value operation circuit is used for conducting when the pixel difference is smaller than or equal to the preset threshold value, obtaining the sub-pixel mean value of two adjacent columns of pixels, and then outputting the sub-pixel mean value to the digital-to-analog conversion circuit.

2. The source driving apparatus as claimed in claim 1, wherein the pixel detection circuit comprises a difference operation sub-circuit and a comparison sub-circuit; the output end of the external control circuit comprises a pixel output end and a threshold value output end;

the first input end of the difference value operation sub-circuit and the first input end of the comparison sub-circuit are both used as the input ends of the pixel detection circuit;

the output end of the comparison sub-circuit is used as the output end of the pixel detection circuit;

The first input end of the difference value operation sub-circuit is electrically connected with the pixel output end;

the first input end of the comparison sub-circuit is electrically connected with the threshold output end; the second input end of the comparison sub-circuit is electrically connected with the output end of the difference value operation sub-circuit;

the output end of the comparison sub-circuit is electrically connected with the input end of the switch circuit and the input end of the mean value operation circuit;

the difference value operation sub-circuit is used for acquiring the pixel difference of the sub-pixel values of two adjacent columns of pixels;

the comparison sub-circuit is used for detecting whether the pixel difference is larger than the preset threshold value or not; when the pixel difference is larger than the preset threshold value, controlling the switch circuit to be conducted; and when the pixel difference is smaller than or equal to the preset threshold value, controlling the mean value operation circuit to be conducted.

3. The source driving apparatus according to claim 2, further comprising a multiplication circuit corresponding to each column of pixels;

the output end of the comparison sub-circuit is electrically connected with the input end of the switch circuit and the input end of the mean value operation circuit through the multiplication operation circuit;

the comparison sub-circuit is also used for sending the detection result to the multiplication circuit;

The multiplication operation circuit is used for controlling all the switch circuits to be switched on and outputting sub-pixel values of pixels which are sequenced at the front in two adjacent columns of pixels to all the digital-to-analog conversion circuits when the detection result of at least one comparison sub-circuit indicates that the pixel difference is larger than the preset threshold value; and when the detection results of all the comparison sub-circuits are that the pixel difference is smaller than or equal to the preset threshold value, controlling all the mean value operation circuits to be conducted, so that the mean value operation circuits obtain the sub-pixel mean values of two adjacent columns of pixels and then output the sub-pixel mean values to the digital-to-analog conversion circuit.

4. The source driving apparatus according to claim 2, further comprising a serial-to-parallel conversion circuit and a buffer circuit;

the first input end of the difference value operation sub-circuit is electrically connected with the pixel output end through the serial-parallel conversion circuit and the cache circuit;

the first input end of the difference value operation sub-circuit, the buffer circuit, the serial-parallel conversion circuit and the pixel output end are connected in sequence.

5. The source driving device as claimed in claim 1, wherein the predetermined thresholds corresponding to the sub-pixels of each column of pixels are all the same, or the predetermined thresholds corresponding to the sub-pixels of each column of pixels are at least partially different.

6. The source driving apparatus according to claim 1, wherein the external control circuit comprises a timing control sub-circuit;

the time sequence control sub-circuit is used for outputting the sub-pixel value of each column of pixels and the preset threshold value corresponding to the sub-pixel of each column of pixels.

7. The source driving apparatus according to claim 1, wherein the external control circuit comprises a timing control sub-circuit and a threshold control sub-circuit;

the time sequence control sub-circuit is used for outputting sub-pixel values of all columns of pixels;

the threshold control sub-circuit is used for outputting preset thresholds corresponding to sub-pixels of each row of pixels.

8. The source driving apparatus according to claim 1, further comprising an analog voltage circuit and a power amplification circuit;

the analog voltage circuit and the power amplifying circuit are respectively connected with the digital-to-analog conversion circuit.

9. A control method of a source drive apparatus according to any one of claims 1 to 8, comprising:

receiving a sub-pixel value of each row of pixels and a preset threshold value corresponding to the sub-pixels of each row of pixels input by an external control circuit through a pixel detection circuit, and detecting whether a pixel difference of the sub-pixel values of two adjacent rows of pixels is larger than the preset threshold value or not;

If the pixel detection circuit detects that the pixel difference is larger than the preset threshold value, the switching circuit is controlled to be switched on, and a sub-pixel value of a pixel which is sequenced at the front in two adjacent columns of pixels is output to the digital-to-analog conversion circuit;

and if the pixel detection circuit detects that the pixel difference is smaller than or equal to the preset threshold value, the mean value operation circuit is controlled to be switched on, and after the sub-pixel mean values of two adjacent columns of pixels are obtained, the sub-pixel mean values are output to the digital-to-analog conversion circuit.

10. A display system comprising a display panel, an external control circuit, and the source drive apparatus according to any one of claims 1 to 8;

the output end of the external control circuit is electrically connected with the input end of the pixel detection circuit in the source driving device;

the source driving device is electrically connected with the display panel.