Hybrid-driven cholesteric liquid crystal display, microprocessor, and hybrid driving method

Abstract

A hybrid-driven cholesteric liquid crystal display, microprocessor, and hybrid driving method. The cholesteric liquid crystal display includes a display panel and a microprocessor. A threshold grayscale value is set for the image displayed by the display panel. The microprocessor first changes the value exceeding the threshold grayscale value to the grayscale value for bright color display, and then drives the display panel in a DDS driving mode to display the image. The microprocessor then drives the display image in a PWM driving mode, thereby significantly improving the color gradation and contrast display effect of the image.

Description

Technical Field

[0001] The present invention relates to a hybrid-driven cholesteric liquid crystal display, a microprocessor, and a hybrid driving method, and in particular to a cholesteric liquid crystal display, a microprocessor, and a hybrid driving method that are driven by a hybrid of a DDS driving mode and a PWM driving mode to display images. Background Art

[0002] Cholesteric Liquid Crystal Display (Ch-LCD) has a bistable characteristic and can maintain the displayed content without consuming power. It is often used in products such as temperature sensor displays, e-books, e-paper, and electronic whiteboards.

[0003] The portion of a cholesteric liquid crystal display that displays an image is called a display panel. The display panel includes multiple display units that display an image together. The driving methods for driving the display panel to display an image include a DDS driving mode and a PWM driving mode.

[0004] The PWM drive mode exhibits poor contrast but excellent color gradation. This is because reflectivity is poor when displaying dark colors, typically around 6%. The PWM drive mode also offers a higher grayscale depth, typically 16 levels. The DDS drive mode exhibits higher contrast but less ideal color gradation. This is because reflectivity can be suppressed to a low level when displaying dark colors, typically around 4.5%. The DDS drive mode also offers a narrower grayscale depth, typically only 4 to 8 levels.

[0005] See also Figure 1 as well as Figure 2 , Figure 1 It is a standard display screen diagram in conventional technology. Figure 2 This is a schematic diagram of a display screen in a PWM driving mode in the conventional technology. In order to display a high-level image, the driving mode generally used is a PWM driving mode. Figure 1 If you want to display the standard display screen target, the result of directly using the PWM drive mode to display the screen will be as follows Figure 2 As shown, the original intention was to obtain a higher grayscale depth, but the result was that the dark color part would not be dark enough. The disadvantages are as follows Figure 2 The gray state of the middle right half shows that the contrast effect of the picture is deteriorated.

[0006] Therefore, in order to solve the problem of the difficulty in achieving both contrast and color gradation in the cholesteric liquid crystal display, the main purpose of the present invention is to provide a hybrid-driven cholesteric liquid crystal display, a microprocessor, and a hybrid driving method to solve the above problem in an ideal technical manner. Summary of the Invention

[0007] The object of the present invention is to provide a hybrid-driven cholesteric liquid crystal display, a microprocessor, and a hybrid driving method, which use a DDS driving mode and a PWM driving mode to hybridly drive to display images, thereby significantly improving the color gradation and contrast display effect of the image.

[0008] The present invention relates to a hybrid-driven cholesteric liquid crystal display for improving the display effect of color gradation and contrast. The cholesteric liquid crystal display includes a display panel and a microprocessor.

[0009] The display panel includes a plurality of display units to display a picture together. The picture has a predetermined grayscale depth so that each display unit has a corresponding grayscale value. In addition, a threshold grayscale value needs to be pre-set within the grayscale value range of the grayscale depth.

[0010] The microprocessor can be a timing controller (TCON) chip. The microprocessor will first prepare the grayscale values ​​to be displayed by multiple display units on the screen, change the values ​​that exceed the threshold grayscale value to the grayscale value displayed in the bright state, and then drive the display panel in the DDS driving mode to display the image. The microprocessor then drives the display panel in the PWM driving mode to display the image within the grayscale depth range. This can significantly improve the color gradation and contrast display effect of the image.

[0011] As in the aforementioned cholesteric liquid crystal display, the predetermined grayscale depth of the image is a grayscale value ranging from 0 to 255, the threshold grayscale value can be set to 16, and the grayscale value of the bright color can be set to above 240.

[0012] Furthermore, the display unit of the picture may have three primary colors: R, G, and B. The three primary colors R, G, and B respectively have the corresponding grayscale values ​​mentioned above.

[0013] In addition to being a cholesteric liquid crystal display, the present invention is also a hybrid drive microprocessor used in a cholesteric liquid crystal display. The microprocessor can be used to improve the color gradation and contrast display effects of the display panel image in the cholesteric liquid crystal display. The image has a predetermined grayscale depth so that each display unit has a corresponding grayscale value. The microprocessor includes a DDS driver module and a PWM driver module.

[0014] A threshold grayscale value must be set within the grayscale value range of the grayscale depth. First, the DDS driver module changes the grayscale values ​​exceeding the threshold grayscale value to grayscale values ​​for bright color display among the grayscale values ​​to be displayed by multiple display units on the screen. The display panel is then driven in DDS driving mode to display the screen.

[0015] After the DDS driver module changes the grayscale values ​​above the threshold to bright colors, the PWM driver module then uses PWM drive mode to drive the display panel within the grayscale depth range to display the image. Following the DDS driver module, the PWM driver module further enhances the color gradation and contrast of the displayed image, thereby improving the overall display quality.

[0016] Like the aforementioned microprocessor, the microprocessor may be a timing controller (TCON).

[0017] To further illustrate, in the aforementioned microprocessor, the predetermined grayscale depth of the image is a grayscale value ranging from 0 to 255, the threshold grayscale value can be set to 16, and the grayscale value of the bright color can be set to above 240.

[0018] In addition to being a hybrid-driven cholesteric liquid crystal display and microprocessor, the present invention also provides a hybrid driving method. The hybrid driving method is used to drive a cholesteric liquid crystal display and enhance the color gradation and contrast of a display panel image. The image has a predetermined grayscale depth so that each display unit has a corresponding grayscale value. A threshold grayscale value must be pre-set within the grayscale depth. The hybrid driving method includes the following steps:

[0019] First, among the grayscale values ​​to be displayed in a plurality of display units on the screen, the values ​​exceeding the threshold grayscale value are changed into grayscale values ​​displayed in a bright color.

[0020] Then, the display panel is driven in a DDS driving mode to display an image.

[0021] Then, the display panel is driven in a PWM driving mode within a grayscale value range of the grayscale depth to display the image.

[0022] In this way, after the bright color correction, the picture displayed in DDS drive mode and then in PWM drive mode will have greatly improved color levels and contrast, thereby enhancing the overall display effect.

[0023] It is supplemented that, in the aforementioned hybrid driving method, the predetermined grayscale depth of the image is a grayscale value ranging from 0 to 255, the threshold grayscale value can be set to 16, and the grayscale value of the bright color can be set to 240 or above.

[0024] To further illustrate, the optimal driving time ratio of the DDS driving mode to the PWM driving mode is 1:4, which produces a more ideal display effect.

[0025] Therefore, the present invention provides a hybrid-driven cholesterol liquid crystal display, microprocessor, and hybrid driving method. A microprocessor such as a timing control chip is used to control the display panel to display the image. A threshold grayscale value is preset, and the DDS driving mode and PWM driving mode are mixed and driven in sequence. After driving in the DDS driving mode, the bright color display is corrected, thereby significantly improving the color level and contrast display effect of the image.

[0026] Other features and benefits of the present invention will be described in the following description and, in part, will become apparent from the description or be understood through practice of the present invention. The objectives and other benefits of the present invention can be achieved and obtained through the structures specifically pointed out in the description, claims, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work. The positional relationships described in the drawings in the following description are based on the directions of the components drawn in the diagrams, unless otherwise specified.

[0028] Figure 1 It is a schematic diagram of a display screen presented in a standard manner in the conventional art;

[0029] Figure 2 This is a schematic diagram of a display screen in a PWM drive mode in conventional technology;

[0030] Figure 3 Schematic diagram of functional elements of the hybrid drive cholesteric liquid crystal display of the present invention;

[0031] Figure 4A Schematic diagram of the DDS driving mode of the present invention driving the display screen;

[0032] Figure 4B Schematic diagram of the present invention driving a display screen in a PWM driving mode followed by a DDS driving mode;

[0033] Figure 5 Schematic diagram of the functional modules of the hybrid drive microprocessor of the present invention;

[0034] Figure 6 is a flow chart of the hybrid driving method of the present invention;

[0035] Figure 7 This is a comparison diagram of the effects of the screen display presented by the two time ratios of the present invention.

[0036] Reference numerals:

[0037] 30: Cholesteric liquid crystal display;

[0038] 32: display panel;

[0039] 34: microprocessor;

[0040] 42: DDS driver module;

[0041] 44: PWM driver module. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variations thereof all mean "at least including".

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrally formed connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0045] The present invention relates to a hybrid-driven cholesteric liquid crystal display, a microprocessor, and a hybrid driving method. By sequentially hybrid-driving the DDS driving mode and the PWM driving mode, the color gradation and contrast display effect of the picture can be greatly improved. Figure 3 , Figure 3 Schematic diagram of the functional components of a hybrid-driven cholesteric liquid crystal display 30 of the present invention. The present invention relates to a hybrid-driven cholesteric liquid crystal display 30 for enhancing the display effect of color gradation and contrast. The cholesteric liquid crystal display 30 includes a display panel 32 and a microprocessor 34.

[0046] The display panel 32 includes a plurality of display units (not shown) that collectively display a single image. The image has a predetermined grayscale depth such that each display unit has a corresponding grayscale value, and a specific threshold grayscale value is required within the grayscale depth range. The predetermined grayscale depth of the image can be a grayscale value ranging from 0 to 255. The grayscale value range of 0 to 255 is a commonly used definition of the grayscale depth range. Higher grayscale values ​​result in brighter displays, with a grayscale value of 255 being almost bright white. Lower grayscale values ​​result in darker displays, with a grayscale value of 0 being almost dark black. The inventors have repeatedly tested and determined that a threshold grayscale value of 16 can produce an ideal display effect. The test results and evidence are presented in the following figures.

[0047] When the display panel 32 is about to start displaying an image, the microprocessor 34 first changes the grayscale values ​​exceeding the threshold grayscale value to the grayscale value for displaying a bright color among the grayscale values ​​to be displayed in the multiple display units of the image. The display panel 32 is then driven in the DDS driving mode to display the image. The grayscale value for the bright color can be above 240, or the grayscale value for the bright color can be directly set to 255, i.e., displayed as a nearly bright white.

[0048] The microprocessor 34 then drives the display panel 32 in a PWM drive mode, with a grayscale depth range, to display a specific, predetermined grayscale value within the grayscale depth range of 0 to 255. This method, which first converts values ​​exceeding the threshold grayscale value to grayscale values ​​for bright color display, then drives the display in a DDS drive mode, and then in a PWM drive mode, significantly improves the image's color gradation and contrast. The microprocessor 34 can utilize a timing controller (TCON).

[0049] Further, as in the aforementioned cholesteric liquid crystal display 30, the display units of the image may be in a pure black, gray, or white display mode, or in a display mode with the three primary colors of R, G, and B. The grayscale depth of the pure black, gray, or white display mode is a pure grayscale value ranging from 0 to 255, while the display mode with the three primary colors of R, G, and B has grayscale values ​​ranging from 0 to 255, respectively, with the three primary colors of R, G, and B having corresponding grayscale depths.

[0050] In conjunction with the above, please refer to Figure 4A , Figure 4A This is a schematic diagram of the DDS driving mode of the present invention driving the display screen. In the previous embodiment, the microprocessor 34 first changes the display unit with a grayscale value exceeding the threshold grayscale value of 16 to a bright color above grayscale value 240, or directly changes it to a bright color of grayscale value 255. The display can be as shown Figure 4A As shown in the example, the center and left half of the screen are displayed in a bright color with a grayscale value of 255 because the grayscale value displayed by the default setting is higher than the threshold grayscale value of 16. The grayscale value in the right half of the screen is lower than the threshold grayscale value of 16, so it still retains the original grayscale value display state. Therefore, the display of the entire screen is as shown in the figure.

[0051] Then cooperate Figure 4A Please see further Figure 4B , Figure 4B This is a schematic diagram of the present invention driving the display screen in the PWM driving mode following the DDS driving mode. Figure 4A After changing the display unit of the grayscale value exceeding the threshold grayscale value of 16 to a bright color display of grayscale value above 240, the display panel 32 is driven in the PWM driving mode to display the image. The result is as follows: Figure 4B As shown in the figure, not only the color gradation of the display screen is more complete, but also the contrast of the display screen is greatly improved, thus avoiding Figure 2 Defects shown.

[0052] See also Figure 5 , Figure 5 Schematic diagram of the functional modules of a hybrid-driven microprocessor 34 of the present invention. In addition to being a hybrid-driven cholesteric liquid crystal display 30, the present invention can also be a hybrid-driven microprocessor 34, which is also used to enhance the color gradation and contrast of the display panel 32 of the cholesteric liquid crystal display 30. The microprocessor 34 can be a timing control chip. In this embodiment, the microprocessor 34 further includes a DDS driver module 42 and a PWM driver module 44.

[0053] The screen has a predetermined grayscale depth so that each display unit has a corresponding grayscale value. The grayscale depth is, for example, a grayscale value range of 0 to 255. The grayscale value range of 0 to 255 is a generally used grayscale depth range definition. The higher the grayscale value, the brighter the display. When the grayscale value is 255, it is almost bright white. The lower the grayscale value, the darker the display. When the grayscale value is 0, it is almost dark black.

[0054] First, a specific threshold grayscale value is pre-set within the grayscale depth. The DDS driver module 42 converts grayscale values ​​exceeding the threshold grayscale value to grayscale values ​​for bright colors, among the grayscale values ​​to be displayed by the multiple display units on the screen. The display panel 32 is then driven in a DDS driving mode to display the image. The inventors have repeatedly tested and found that the threshold grayscale value can be 16, and the bright color grayscale value can be set to 240 or above, or the bright color grayscale value can be directly set to 255.

[0055] After the DDS driver module 42 changes the display units whose grayscale values ​​exceed the threshold grayscale value to bright colors, the PWM driver module 44 then drives the display panel 32 in a PWM driving mode within the grayscale depth range to display the image, i.e., to display a predetermined grayscale value within the grayscale depth range of 0 to 255. This method of first changing the display units exceeding the threshold grayscale value to bright colors, then driving the display in the DDS driving mode, and finally driving the display in the PWM driving mode can significantly improve the color gradation and contrast of the image.

[0056] As described above, the microprocessor 34 may display the image in a pure black, gray, or white display mode, or in a display mode using the three primary colors of R, G, and B. The pure black, gray, or white display modes have grayscale depths ranging from 0 to 255, while the R, G, and B primary colors display mode uses the three primary colors of R, G, and B, each with a corresponding grayscale depth ranging from 0 to 255.

[0057] See also Figure 6 , Figure 6 Flowchart of the hybrid driving method of the present invention. In addition to the aforementioned hybrid-driven cholesteric liquid crystal display 30 or hybrid-driven microprocessor 34, the present invention may also be a hybrid driving method that enables the cholesteric liquid crystal display 30 to enhance the color gradation and contrast of the display panel 32, or utilizes the microprocessor 34 to drive the cholesteric liquid crystal display 30 to enhance the color gradation and contrast of the display panel 32.

[0058] The image has a predetermined grayscale depth so that each display unit has a corresponding grayscale value, and a specific threshold grayscale value is pre-set in the grayscale depth. The hybrid driving method includes the following steps:

[0059] Step 1 ( S01 ): First, among the grayscale values ​​to be displayed in a plurality of display units on a screen, the values ​​exceeding a threshold grayscale value are changed to grayscale values ​​for bright color display.

[0060] Step 2 (S02): Next, the display panel 32 is driven in the DDS driving mode to display the image. As mentioned above, the microprocessor 34 can be used to drive the display panel 32. Generally speaking, before the microprocessor 34 changes the grayscale value of the bright color display and drives the display panel 32 in the DDS driving mode, there will be a screen reset action. Therefore, there is no need to arrange a special screen reset step in advance. The screen display result will be as follows: Figure 4A shown.

[0061] Step 3 (S03): Next, the display panel 32 is driven in the grayscale depth range in the PWM driving mode to display the image. The result of the image display will be as follows: Figure 4B shown.

[0062] In this way, the display units that exceed the threshold grayscale value are first changed to the grayscale value of the bright color, followed by driving the display in DDS driving mode, and then driving the display screen in PWM driving mode. This method can greatly improve the color level and contrast display effect of the display screen.

[0063] The hybrid driving method can be driven by the hybrid driving cholesteric liquid crystal display 30 or the hybrid driving microprocessor 34 , wherein the microprocessor 34 can be a timing control chip.

[0064] As in the aforementioned hybrid driving method, the image can be displayed in a pure black, gray, or white mode, or in a display mode with the three primary colors of R, G, and B. The grayscale depth of the pure black, gray, or white display mode is a grayscale value in the range of 0 to 255 for pure grayscale, while the display mode with the three primary colors of R, G, and B has grayscale values ​​in the range of 0 to 255 for the three primary colors of R, G, and B, respectively.

[0065] In the aforementioned hybrid drive method process embodiment, the predetermined grayscale depth of the image can be a grayscale value ranging from 0 to 255. The grayscale value range of 0 to 255 is a commonly used grayscale depth range definition. Higher grayscale values ​​indicate brighter display, with a grayscale value of 255 being almost bright white. Lower grayscale values ​​indicate darker display, with a grayscale value of 0 being almost dark black. Based on repeated experiments by the inventors, the threshold grayscale value can be 16, the bright color grayscale value can be 240 or higher, or the bright color grayscale value can be directly set to 255.

[0066] See also Figure 7 , Figure 7This figure compares the display effects of two different time ratios according to the present invention. In the aforementioned hybrid-drive cholesteric liquid crystal display 30, microprocessor 34, or hybrid drive method, the drive time ratio between the DDS drive mode and the PWM drive mode can be 1:4. Experiments have confirmed that this drive time ratio provides the best display effect.

[0067] Figure 7 The upper part of the picture is the display picture obtained when the driving time ratio of DDS driving mode to PWM driving mode is 1:4. Figure 7 The lower picture is the display screen obtained by the driving time ratio of DDS driving mode to PWM driving mode is 1:8. It is obvious that the display of the upper picture is better than that of the lower picture, with more perfect color gradation and contrast.

[0068] Therefore, the present invention provides a hybrid-driven cholesterol liquid crystal display 30, a microprocessor 34, and a hybrid driving method. The microprocessor 34, such as a timing control chip, controls the display panel 32 to display the image. A threshold grayscale value is preset, and the DDS driving mode and the PWM driving mode are mixed and driven in sequence. After driving in the DDS driving mode, the bright color display correction is performed, thereby significantly improving the color level and contrast display effect of the image.

[0069] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention may be improved in only one or several aspects, without having to simultaneously solve all the technical problems listed in the prior art or background art. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as limiting the claim.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid-driven cholesteric liquid crystal display for improving the display effect of color gradation and contrast, characterized in that: The cholesteric liquid crystal display comprises: A display panel comprising a plurality of display units for jointly displaying a picture, wherein the picture has a predetermined grayscale depth so that each display unit has a corresponding grayscale value, and a threshold grayscale value is set in the grayscale depth; as well as A microprocessor first prepares grayscale values ​​to be displayed for multiple display units in a screen, changes values ​​that exceed the threshold grayscale value to grayscale values ​​for bright color display, and then drives the display panel in a DDS driving mode to display the screen. The microprocessor then drives the display panel in a PWM driving mode within a predetermined grayscale depth range to display the screen, thereby improving the color gradation and contrast display effects of the screen.

2. The cholesteric liquid crystal display according to claim 1, wherein: The display unit of the picture has three primary colors: R, G, and B, each having a corresponding grayscale value.

3. The cholesteric liquid crystal display according to claim 1, wherein: The microprocessor is a timing control chip (Timing Controller; TCON).

4. The cholesteric liquid crystal display according to claim 1, wherein: The predetermined grayscale depth of the image is a grayscale value ranging from 0 to 255, the threshold grayscale value is 16, and the grayscale value of the bright color is greater than 240.

5. A hybrid drive microprocessor for enhancing the color gradation and contrast of a display panel image in a cholesteric liquid crystal display, wherein the image has a predetermined grayscale depth so that each display unit has a corresponding grayscale value, characterized in that: The microprocessor comprises: a DDS driver module configured to set a threshold grayscale value in the grayscale depth, and to convert grayscale values ​​exceeding the threshold grayscale value to grayscale values ​​corresponding to bright colors among grayscale values ​​to be displayed by a plurality of display units on the screen, and to continue driving the display panel in a DDS driving mode to display the screen; as well as A PWM driving module drives the display panel in a predetermined grayscale depth range in a PWM driving mode to display the image after the DDS driving module changes the display unit whose grayscale value exceeds the threshold grayscale value to a bright color display. The color gradation and contrast of the image displayed by the PWM driving module are improved.

6. The microprocessor according to claim 5, wherein: The microprocessor is a timing control chip (Timing Controller; TCON).

7. The microprocessor according to claim 5, wherein: The predetermined grayscale depth of the image is a grayscale value ranging from 0 to 255, the threshold grayscale value is 16, and the grayscale value of the bright color is greater than 240.

8. A hybrid driving method for driving a cholesteric liquid crystal display and improving the color gradation and contrast display effect of a display panel image, wherein the image has a predetermined grayscale depth so that each display unit has a corresponding grayscale value, and a threshold grayscale value is set within the grayscale depth, characterized in that: The hybrid driving method comprises the following steps: Among the grayscale values ​​to be displayed in the plurality of display units of the screen, values ​​exceeding the threshold grayscale value are changed to grayscale values ​​displayed in a bright color; Then, driving the display panel in a DDS driving mode to display the image; as well as Then, the display panel is driven in a predetermined grayscale depth range in a PWM driving mode to display the image; Among them, the color level and contrast of the picture displayed in the PWM driving mode are improved display effects.

9. The hybrid driving method according to claim 8, characterized in that: The predetermined grayscale depth of the image is a grayscale value ranging from 0 to 255, the threshold grayscale value is 16, and the grayscale value of the bright color is greater than 240.

10. The hybrid driving method according to claim 8, characterized in that: The driving time ratio of the DDS driving mode to the PWM driving mode is 1:4.

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