CN111933086B - Display device and resolution reduction method thereof - Google Patents
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
Abstract
The application discloses a display device and a resolution reduction method thereof. The method comprises the following steps: copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels; dividing every four pixels into a unit, wherein the last two pixel values of the current unit are the first two pixel values of the next unit; respectively converting pixel values of four pixels of each unit into brightness values; calculating the average value of the brightness of each unit; comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of the pixel is greater than or equal to the average brightness value of the pixel, setting the corresponding position as Y, and otherwise, setting the corresponding position as N; and removing the second pixel or the third pixel in each unit according to a comparison table according to the comparison result.
Description
Technical Field
The present disclosure relates to a display device and a method for reducing a resolution thereof, and more particularly, to a display device and a method for reducing a resolution of a pixel thereof.
Background
With the progress of technology, flat panel display devices have been widely used in various fields, such as liquid crystal display devices, and have superior characteristics of being light and thin, low power consumption and being non-radiative, so that they have gradually replaced the conventional cathode ray tube display devices and are applied to various electronic products, such as mobile phones, portable multimedia devices, notebook computers, liquid crystal televisions, liquid crystal screens, and so on.
In the current display device technology field, the line buffer (line buffer) is used to perform the pixel down-sampling process in the timing control circuit (T-con) to change the resolution of the picture, which is generally implemented by a method called multi-angle detection, but this method has the disadvantage of occupying too much hardware resources. Taking the detection method of 9 pixels of 9 grids using 8 angles of 0 °, 45 °, 90 °, … 315 °, a four-line buffer (line buffer) is conventionally required to store the down-sampled pixels. Taking the Ultra-high-definition (UHD) resolution as an example, the line buffer capacity of 368.64Kbits is required, and the occupied hardware resources are quite large, so that the cost of the display device is also high (the line buffer has a great influence on the cost).
Disclosure of Invention
An object of the present invention is to provide a display device and a method for reducing resolution thereof, which can reduce hardware resources of a line buffer used for pixel down-sampling and improve competitiveness of a product.
The application provides a resolution reduction method of a display device, which comprises the following steps: copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels; dividing every four pixels into a unit to obtain pixel groups of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit; respectively converting pixel values of four pixels of each unit into brightness values; calculating the average value of the brightness of each unit; comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of the pixel is more than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, and otherwise, setting the position of the pixel as N; and removing the second pixel or the third pixel in each unit according to a comparison table according to the comparison result to obtain a plurality of pixel values after down sampling.
In an embodiment, the plurality of pixels are at least a part of pixels of a display frame of a display panel of the display device.
In one embodiment, the direction is a horizontal direction or a vertical direction.
In one embodiment, each pixel includes a plurality of sub-pixels of different colors, each sub-pixel having a gray level.
In one embodiment, the step of converting the pixel values of the four pixels of each unit into the luminance values respectively is performed according to the following calculation formula: LV-pixel (n) ═ pixel (n) _ R × 0.21+ pixel (n) _ G × 0.58+ pixel (n) _ B × 0.11, where LV-pixel (n) is the luminance value of the nth pixel, pixel (n) _ R is the gray-scale value of red of the nth pixel, pixel (n) _ G is the gray-scale value of green of the nth pixel, pixel (n) _ B is the gray-scale value of blue of the nth pixel, and n is a positive integer.
In one embodiment, the step of averaging the luminance of each cell is performed according to the following calculation formula:
AVR-LV ═ 4 (LV-pixel (n) + LV-pixel (n +1) + LV-pixel (n +2) + LV-pixel (n +3))/4, where AVR-LV is a luminance average value of four pixels in one unit, LV-pixel (n) is a luminance value of the nth pixel, LV-pixel (n +1) is a luminance value of the nth +1 pixel, LV-pixel (n +2) is a luminance value of the nth +2 pixel, LV-pixel (n +3) is a luminance value of the nth +3 pixel, and n is a positive integer.
In one embodiment, the number of down-sampled pixels is half the number of original pixels.
In one embodiment, the look-up table is pre-stored in a timing control circuit of the display device.
The application further provides a display device, which comprises a display panel and a driving module. The driving module is electrically connected with the display panel, and when the display panel displays a display picture, the driving module at least performs the following steps to reduce the resolution of the display picture: copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels; dividing every four pixels into a unit to obtain pixel groups of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit; respectively converting pixel values of four pixels of each unit into brightness values; calculating the average value of the brightness of each unit; comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of the pixel is more than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, and otherwise, setting the position of the pixel as N; and removing the second pixel or the third pixel in each unit according to a comparison table according to the comparison result to obtain a plurality of pixel values after down sampling.
The present application also provides a resolution reduction method for a display apparatus, including: copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels; dividing every four pixels into a unit to obtain pixel groups of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit; converting the pixel values of the four pixels of each unit into luminance values respectively, wherein the conversion is performed according to the following calculation formula: LV-pixel (n) ═ pixel (n) _ R × 0.21+ pixel (n) _ G × 0.58+ pixel (n) _ B × 0.11, LV-pixel (n) is a luminance value of the nth pixel, pixel (n) _ R is a gray-scale value of red of the nth pixel, pixel (n) _ G is a gray-scale value of green of the nth pixel, pixel (n) _ B is a gray-scale value of blue of the nth pixel, and n is a positive integer; calculating the average value of the brightness of each unit; comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of the pixel is more than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, and otherwise, setting the position of the pixel as N; and removing the second pixel or the third pixel in each unit according to a comparison table according to the comparison result to obtain a plurality of pixels after down sampling, wherein the comparison table is prestored in a time sequence control circuit of the display device.
In view of the above, in the display device and the resolution reduction method thereof of the present application, a first pixel value of a plurality of pixels arranged in sequence along a direction is copied, the copied pixel value is arranged at a first position of the plurality of pixels, every four pixels are divided into a unit to obtain a pixel group of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit, the pixel values of the four pixels of each unit are respectively converted into luminance values, the luminance average value of each unit is obtained, the luminance values of the four pixels of each unit are respectively compared with the luminance average value thereof, if the luminance value of the pixel is greater than or equal to the luminance average value thereof, the corresponding position of the pixel is set as Y, otherwise, the pixel is set as N, and the second pixel or the third pixel in each unit is removed according to a comparison table according to the comparison result, the design of a plurality of pixel values after down-sampling is obtained, so that the display device and the resolution reduction method thereof can complete down-sampling in the horizontal direction or the vertical direction by using two line buffers, thereby saving the capacity of the line buffers and further improving the product competitiveness.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a flowchart illustrating a resolution reduction method of a display device according to an embodiment of the present application.
Fig. 2A and 2B are schematic process diagrams illustrating a method for reducing resolution of a display device according to an embodiment of the present application.
Fig. 3A and 3B are schematic process diagrams illustrating a resolution reduction method of a display device according to another embodiment of the present application.
Fig. 4 is a schematic diagram of a display device according to an embodiment of the present application.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present application. This application may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, it is to be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or assembly must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
A display device and a method of reducing resolution thereof according to some embodiments of the present application will be described below with reference to the accompanying drawings, in which like elements are described with like reference numerals.
Fig. 1 is a flowchart illustrating a resolution reduction method of a display device according to an embodiment of the present disclosure, fig. 2A and 2B are process diagrams illustrating a resolution reduction method of a display device according to an embodiment of the present disclosure, and fig. 3A and 3B are process diagrams illustrating a resolution reduction method of a display device according to another embodiment of the present disclosure.
Please refer to fig. 1 and fig. 2A to fig. 3B to describe the detailed technical content of the resolution reduction method of the display device of the present application. Therefore, the resolution of the display frame of the display device is reduced by utilizing pixel down-sampling, thereby reducing the hardware resource of a line buffer used by the pixel down-sampling and improving the method of product competitiveness.
As shown in fig. 1, the resolution reduction method of the display device of the present application may include at least the following steps.
First, step S01 is: a first pixel value of a plurality of pixels arranged in order in a direction is copied, and the copied pixel value is arranged at a first position of the plurality of pixels. Here, the pixel value of a pixel is a gray scale value, and how to down-sample can be determined by knowing the gray scale value of a previous pixel of a certain pixel. The plurality of pixels may be at least a portion of pixels of a display screen of a display panel of the display device, and the display panel may be a liquid crystal display panel or an organic light emitting diode display panel, without limitation. As shown in fig. 2A, the pixels of the display panel of the present embodiment are sequentially arranged along a horizontal direction, and in step S01, the data of the first pixel value (i.e., the pixel value at the first position) sequentially arranged along the horizontal direction is copied and then arranged at the first position of the plurality of pixels sequentially arranged along the horizontal direction. Therefore, the pixels arranged in the horizontal direction are P1, P1, P2, P2, P3, P4, … in order from left to right. It should be noted that the pixels P1, P2, …, P15, etc. in the figure may also represent the pixel values (e.g., gray-scale values) of the pixels, respectively.
Next, step S02 is: dividing every four pixels into a unit to obtain a plurality of unit pixel groups, wherein the last two pixel values of the current unit are the first two pixel values of the next unit. Here, every four pixels are sequentially divided into one unit in the horizontal direction, however, it should be noted that the last two pixel values of the current unit are sequentially the first two pixel values of the next unit. As shown in fig. 2B, in the horizontal direction, the first cell includes pixels P1, P1, P2, P3, the last two pixels (values) of the first cell: p2 and P3 are the first two pixels (values) of the second cell, so the second cell sequentially includes P2, P3, P4 and P5, the last two pixels (values) P4 and P5 of the second cell are the first two pixels (values) of the third cell, so the third cell sequentially includes P4, P5, P6 and P7, the last two pixels (values) P6 and P7 of the third cell are the first two pixels (values) of the fourth cell, so the fourth cell sequentially includes P6, P7, P8, P9 and …, and so on, that the first two pixel values of the next cell are the last two pixel values of the current cell.
In a different embodiment, the plurality of pixels are arranged in the vertical direction in sequence as in the embodiment of fig. 3A, and in step S01, the data of the first (position) pixel value arranged in the vertical direction is copied first and then the first position of the plurality of pixels arranged in the vertical direction is arranged. Therefore, the pixel values arranged in the vertical direction are P1, P1, P2, P2, P3, and P4 … in this order from top to bottom. In addition, in step S02, as shown in fig. 3B, in the vertical direction, as in the rule described above: the last two pixel values of the current cell are the first two pixel values of the next cell, so the first cell sequentially includes pixels (values) P1, P1, P2, P3, the second cell sequentially includes pixels (values) P2, P3, P4, P5, the third cell sequentially includes pixels (values) P4, P5, P6, P7, the fourth cell sequentially includes pixels (values) P6, P7, P8, P9, …, and so on, and the same is the last two pixel values of the next cell.
Referring to fig. 1 again, next, step S03 is: the pixel values of the four pixels of each unit are converted into luminance values, respectively. Herein, each pixel may include a plurality of sub-pixels of different colors, and each sub-pixel may have a gray scale value. In some embodiments, each pixel may include, for example, three different color sub-pixels, such as, but not limited to, R (red), G (green), and B (blue); in other embodiments, each pixel may include four different color sub-pixels, such as R, G, B, W (white), or R, G, B, Y (yellow), or R, G, B, C (cyan).
In step S03, the pixel values (gray-scale values) of the four pixels in each cell are converted into a luminance value domain. In one embodiment, the conversion between pixel values (gray-scale values) and luminance values is performed according to the following calculation:
LV-pixel (n) ═ pixel (n) _ R × 0.21+ pixel (n) _ G × 0.58+ pixel (n) _ B × 0.11, where LV-pixel (n) is the luminance value of the nth pixel, pixel (n) _ R is the gray-scale value of red of the nth pixel, pixel (n) _ G is the gray-scale value of green of the nth pixel, pixel (n) _ B is the gray-scale value of blue of the nth pixel, and n is a positive integer.
Then, the average value of the luminance of each cell is obtained (step S04). Wherein, the average value of the brightness of each unit is obtained according to the following calculation formula:
AVR-LV ═ 4 (LV-pixel (n) + LV-pixel (n +1) + LV-pixel (n +2) + LV-pixel (n + 3))/where AVR-LV is the average of the luminance of four pixels in one unit.
Therefore, after steps S03 and S04, the luminance value of each pixel of each cell and the average luminance value of each cell can be obtained.
Next, a comparison step S05 is performed: and comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of the pixel is greater than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, and otherwise, setting the position of the pixel as N. Specifically, the four pixels of each cell have a first position pixel (value), a second position pixel (value), a third position pixel (value), and a fourth position pixel (value) in sequence. With four pixels (values) in the first cell of fig. 2B: p1, P1, P2, P3, if the luminance value of the pixel (value) P1 at the first position is greater than or equal to the average value of the luminance of the first cell, the corresponding position (i.e., the first position) of the pixel (value) P1 is set to Y, otherwise the first position is set to N; if the luminance value of the pixel (value) P2 at the second position is greater than or equal to the luminance average value of the first cell, the corresponding position (i.e., the second position) of the pixel (value) P2 is set to Y, otherwise the second position is set to N; if the luminance value of the pixel (value) P3 at the third position is greater than or equal to the luminance average value of the first cell, the corresponding position (i.e., the third position) of the pixel (value) P3 is set to Y, otherwise the third position is set to N; if the luminance value of the pixel (value) P4 at the fourth position is greater than or equal to the luminance average value of the first cell, the corresponding position (i.e., the fourth position) of the pixel (value) P4 is set to Y, otherwise the fourth position is set to N; the other units are analogized in the same way. Therefore, the brightness comparison results of four pixels can be obtained in each unit. Here, Y indicates a large feature, and N indicates a small feature.
Finally, step S06 is performed: and removing the second pixel or the third pixel in each unit according to a comparison result and a comparison table to obtain a plurality of pixel values after down sampling. Here, the look-up table may be as follows, where P (m) is a pixel (value) at a first position in the cell, P (m +1) is a pixel (value) at a second position, P (m +2) is a pixel (value) at a third position, and P (m +3) is a pixel (value) at a fourth position.
Comparison table
The above steps S03 to S06 are applied to the down-sampling of the plurality of pixels in the horizontal direction and the vertical direction. For example, if the comparison result of the first cell of FIG. 2B is N, N, Y, N of 14 in the comparison table, the third pixel in the first cell is retained (P2), and the second pixel is removed (P1); if the comparison result of the second cell of FIG. 2B is N, Y, Y, N of 8 in the lookup table, the second pixel in the second cell is retained (P3), the third pixel is removed (P4), and so on. In other words, the second position pixel and the third position pixel in each unit can be alternatively selected according to the comparison table, and only the pixel value with the larger characteristic is reserved, so that the number of the pixels after down-sampling is half of the original number of the pixels, and therefore, the down-sampling design in the horizontal direction or the vertical direction can be realized.
The comparison table is obtained according to mathematical model simulation and assumption, and the comparison table can be pre-stored in a timing control circuit of the liquid crystal display device or the organic light emitting diode display device, so that the timing control circuit can obtain which one of the second position pixel and the third position pixel of the four pixels in each unit is to be omitted according to the comparison result and the comparison table. Therefore, the resolution reduction method of the display device can complete pixel down-sampling in the horizontal direction or the vertical direction by using the two line buffers (the line buffers only need 1/2 in the traditional design), thereby saving the capacity of the line buffers and further improving the product competitiveness. In addition, the image quality after the down-sampling is well preserved, the image characteristics are not lost, and the high-frequency edge is not blurred.
Fig. 4 is a schematic diagram of a display device according to an embodiment of the present application. As shown in fig. 4, the display device 1 includes a display panel 11 and a driving module 12, wherein the driving module 12 is electrically connected to the display panel 11. The display panel 11 includes a plurality of pixels, each having a pixel value (gray-scale value).
When the display panel 11 displays a display screen, the driving module 12 at least performs a plurality of steps of the resolution reduction method to reduce the resolution.
In summary, in the display device and the resolution reduction method thereof of the present application, a first pixel value of a plurality of pixels sequentially arranged along a direction is copied, the copied pixel value is arranged at a first position of the plurality of pixels, and every four pixels are divided into a unit to obtain a pixel group of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit, the pixel values of the four pixels of each unit are respectively converted into luminance values, and the luminance average value of each unit is obtained; the brightness values of the four pixels of each unit are respectively compared with the brightness average value of the four pixels, if the brightness value of the pixel is larger than or equal to the brightness average value of the four pixels, the corresponding position of the pixel is set as Y, otherwise, the pixel is set as N, and the second pixel or the third pixel in each unit is removed according to a comparison table according to the comparison result so as to obtain the design of a plurality of pixel values after down sampling.
The foregoing is by way of example only, and not limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the scope of the claims.
Claims (10)
1. A resolution reduction method for a display device, comprising:
copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels;
dividing every four pixels into a unit to obtain pixel groups of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit;
respectively converting pixel values of four pixels of each unit into brightness values;
calculating the average value of the brightness of each unit;
comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of a pixel is greater than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, otherwise, setting the position of the pixel as N, wherein the setting of Y represents that the pixel has larger characteristics, and the setting of N represents that the pixel has smaller characteristics; and
and removing the second pixel or the third pixel in each unit according to a comparison table according to the comparison result to obtain a plurality of pixel values after down sampling, wherein the removal of the second pixel or the third pixel in each unit is to remove the pixel value with the smaller characteristic in the second pixel or the third pixel and only keep the pixel value with the larger characteristic.
2. The method of claim 1, wherein the plurality of pixels are at least some pixels of a display frame of a display panel of the display device.
3. The method of claim 1, wherein the direction is a horizontal direction or a vertical direction.
4. The method of claim 1, wherein each of the pixels comprises a plurality of sub-pixels of different colors, each sub-pixel having a gray scale value.
5. The method of claim 1, wherein in the step of converting the pixel values of the four pixels of each cell into luminance values, respectively, the conversion is performed according to the following calculation:
LV-pixel (n) ═ pixel (n) _ R × 0.21+ pixel (n) _ G × 0.58+ pixel (n) _ B × 0.11,
the LV-pixel (n) is a luminance value of the nth pixel, the pixel (n) _ R is a gray-scale value of red of the nth pixel, the pixel (n) _ G is a gray-scale value of green of the nth pixel, the pixel (n) _ B is a gray-scale value of blue of the nth pixel, and n is a positive integer.
6. The method of claim 1, wherein the step of averaging the luminance of each cell is performed according to the following calculation:
AVR-LV ═ 4 (LV-pixel (n) + LV-pixel (n +1) + LV-pixel (n +2) + LV-pixel (n +3))/4,
wherein AVR-LV is the average value of the brightness of four pixels in a unit, LV-pixel (n) is the brightness value of the nth pixel, LV-pixel (n +1) is the brightness value of the (n +1) th pixel, LV-pixel (n +2) is the brightness value of the (n +2) th pixel, LV-pixel (n +3) is the brightness value of the (n +3) th pixel, and n is a positive integer.
7. The method of claim 1, wherein the number of down-sampled pixels is half the number of original pixels.
8. The method of claim 1, wherein the look-up table is pre-stored in a timing control circuit of the display device.
9. A display device, comprising:
a display panel; and
the driving module is electrically connected with the display panel, and when the display panel displays a display picture, the driving module at least performs the following steps so as to reduce the resolution of the display picture:
copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels;
dividing every four pixels into a unit to obtain pixel groups of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit;
respectively converting pixel values of four pixels of each unit into brightness values;
calculating the average value of the brightness of each unit;
comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of a pixel is greater than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, otherwise, setting the position of the pixel as N, wherein the setting of Y represents that the pixel has larger characteristics, and the setting of N represents that the pixel has smaller characteristics; and
and removing the second pixel or the third pixel in each unit according to a comparison table according to the comparison result to obtain a plurality of pixel values after down sampling, wherein the removal of the second pixel or the third pixel in each unit is to remove the pixel value with the smaller characteristic in the second pixel or the third pixel and only keep the pixel value with the larger characteristic.
10. A resolution reduction method for a display device, comprising:
copying a first pixel value among a plurality of pixels arranged in sequence along a direction, and arranging the copied pixel value at a first position of the plurality of pixels;
dividing every four pixels into a unit to obtain pixel groups of a plurality of units, wherein the last two pixel values of the current unit are the first two pixel values of the next unit;
converting the pixel values of the four pixels of each unit into luminance values respectively, wherein the conversion is performed according to the following calculation formula: LV-pixel (n) ═ pixel (n) _ R × 0.21+ pixel (n) _ G × 0.58+ pixel (n) _ B × 0.11, LV-pixel (n) is a luminance value of the nth pixel, pixel (n) _ R is a gray-scale value of red of the nth pixel, pixel (n) _ G is a gray-scale value of green of the nth pixel, pixel (n) _ B is a gray-scale value of blue of the nth pixel, and n is a positive integer;
calculating the average value of the brightness of each unit;
comparing the brightness values of the four pixels of each unit with the average brightness value of the four pixels, if the brightness value of a pixel is greater than or equal to the average brightness value of the pixel, setting the corresponding position of the pixel as Y, otherwise, setting the position of the pixel as N, wherein the setting of Y represents that the pixel has larger characteristics, and the setting of N represents that the pixel has smaller characteristics; and
and removing the second pixel or the third pixel in each unit according to a comparison result to obtain a plurality of pixels after down sampling, wherein the comparison table is prestored in a time sequence control circuit of the display device, and the removal of the second pixel or the third pixel in each unit is to remove the pixel value with smaller characteristics in the second pixel or the third pixel and only keep the pixel value with larger characteristics.
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