Display driving method of gray scale image, display driving chip and display device

Abstract

The application discloses a display driving method, a display driving chip and a display device of a gray-scale image, and relates to the technical field of display devices. The display driving method comprises the following steps: allocating a first number of subframe times to a pixel unit; dividing the first number of subframe times into a second number of subfields; dividing n data bits into the second number of subfields for display; determining the luminance value of a light source corresponding to each subfield according to a preset allocation mode; and generating the duration of a single pulse signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield according to a conversion relationship, wherein the conversion relationship comprises that the product of the number of subframe times occupied by the duration of the single pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield and the luminance value of the light source corresponding to each subfield corresponds to the binary value of the data bit displayed in each subfield. The application can reduce the requirement for the bandwidth of the display device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a gray scale display driving method, a gray scale image display driving method, a display driving chip and a display device. BACKGROUND

[0002] A time sequential color display device is a display device that divides color data into multiple color fields to display different colors within an image time of one frame. A general digital driving time sequential color display device requires 256 (28) sub-frame times to display different gray scale effects if it wants to display an 8-bit gray scale image, which requires a large bandwidth of the system. SUMMARY

[0003] Therefore, in order to solve the above technical problems, the present application provides a gray scale image display driving method, a display driving chip and a display device.

[0004] To achieve the above object, the present application provides a gray scale image display driving method applied to a display device, the display device comprising a light source and a display panel, the display panel being provided with a pixel unit, and the gray scale display driving method comprising:

[0005] obtaining a pixel unit modulation time in each color field time of a current frame image to be displayed, the gray scale data of the image being binary gray scale data, and the binary gray scale data comprising n data bits;

[0006] allocating a first number of sub-frame times to the pixel unit modulation time;

[0007] dividing the first number of sub-frame times into a second number of sub-fields, the second number being multiple;

[0008] dividing the n data bits into the second number of sub-fields for display;

[0009] determining a luminance value of the light source corresponding to each sub-field according to a preset allocation mode;

[0010] generating a duration of a single pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each sub-field according to a conversion relationship, the conversion relationship comprising: a product of a number of sub-frame times occupied by the duration of the single pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each sub-field and the luminance value of the light source corresponding to each sub-field corresponding to a binary value of a data bit displayed in each sub-field.

[0011] To solve the above technical problems, another technical solution adopted by the present application is to provide a display driving chip. The display driving chip is applied to a display device, the display device comprising a light source and a display panel, the display panel being provided with a pixel unit. The display driving chip executes the above display driving method when driving the display panel to display images.

[0012] To solve the above technical problems, another technical solution adopted by the present application is to provide a display device, which comprises:

[0013] a display panel, the display panel being provided with a pixel unit; and

[0014] a display driving chip, the display driving chip executing the above display driving method when driving the display panel to display images.

[0015] Advantages: Different from the prior art, the present application allocates a first number of subframe times to the pixel unit; divides the first number of subframe times into a second number of subfields; divides n data bits into the second number of subfields for display; determines the luminance value of the light source corresponding to each subfield according to a preset allocation mode; generates the duration of the single-pulse signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield according to a conversion relationship, the conversion relationship comprising: the product of the number of subframe times occupied by the duration of the single-pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield and the luminance value of the light source corresponding to each subfield corresponds to the binary value of the data bit displayed in each subfield. In this way, the corresponding luminance of the light source is displayed by the pixel unit in the subframe time occupied by the duration of the corresponding single-pulse signal in each subfield, thereby realizing the corresponding gray scale display in the binary gray scale data, which can reduce the pursuit of the number of subframe times in each color field time when displaying gray scales. Therefore, the present application can reduce the requirement for the bandwidth of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a flowchart of the display driving method of the gray scale image of the present application;

[0017] Figure 2 is Figure 1 a flowchart of step S140 in the display driving method of the gray scale image of the present application;

[0018] Figure 3 is a timing diagram of an implementation of the first specific embodiment of the display driving method of the gray scale image of the present application;

[0019] Figure 4 is a timing diagram of another implementation of the first specific embodiment of the display driving method of the gray scale image of the present application;

[0020] Figure 5is a timing diagram of an embodiment of the second embodiment of the display driving method of the gray scale image of the present application;

[0021] Figure 6 is a timing diagram of another embodiment of the second embodiment of the display driving method of the gray scale image of the present application;

[0022] Figure 7 is a timing diagram of an embodiment of the third embodiment of the display driving method of the gray scale image of the present application;

[0023] Figure 8 is a timing diagram of another embodiment of the third embodiment of the display driving method of the gray scale image of the present application;

[0024] Figure 9 is a module schematic diagram of the display driving chip of the present application;

[0025] Figure 10 is a module schematic diagram of the display device of the present application. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present application.

[0027] Reference Figure 1 , Figure 1 is a flowchart of the display driving method of the gray scale image of the present application.

[0028] The display driving method of the gray scale image of the present application can be applied to a display device, which includes a light source and a display panel, and the display panel is provided with pixel units, and a single pixel unit is used for displaying a single pixel of a gray scale image. As shown in Figure 1 , the display driving method of the gray scale image can include steps S110 to S160.

[0029] Step S110: acquiring the pixel unit modulation time in each color field time when a current frame image to be displayed is displayed, the gray scale data of the image being binary gray scale data, and the binary gray scale data containing n data bits.

[0030] In the current frame image display, the current frame (i.e. the display period of a frame of gray scale image) is generally divided into a plurality of color field time, and the plurality of color field time is displayed in time sequence. In each color field time, there is pixel unit modulation time for modulating the pixel unit to make the pixel unit display or not display the corresponding brightness of the light source. That is, in the pixel unit modulation time, the pixel unit can switch between displaying the corresponding brightness of the light source and not displaying the corresponding brightness of the light source. In step S110, the pixel unit modulation time in each color field time is obtained.

[0031] In an exemplary real-time manner, the plurality of color field time is, for example, 2 red color field time, 3 green color field time and 1 blue color field time, a total of 6 color field time, and in step S110, the pixel unit modulation time of each color field time in the 6 color field time is obtained.

[0032] Step S120: Assigning a first number of sub-frame time to the pixel unit modulation time.

[0033] In the embodiment of the present application, the first number is a plurality.

[0034] Step S130: Dividing the first number of sub-frame time into a second number of sub-fields, and the second number is a plurality.

[0035] Step S140: Dividing n data bits into the second number of sub-fields for display.

[0036] Step S150: Determining the brightness value of the light source corresponding to each sub-field according to a preset assignment manner.

[0037] In this way, the brightness value of the light source corresponding to each sub-field is assigned by the system. The preset assignment manner can be set before step S150, so that the brightness value of the light source corresponding to each sub-field can be determined according to the preset assignment manner in step S150.

[0038] In an exemplary real-time manner, in the preset assignment manner, it is provided that the product of the number of sub-frame time contained in each sub-field and the brightness value of the light source corresponding to each sub-field further corresponds to the weight of the data bit corresponding to each sub-field in the binary gray scale data.

[0039] Step S160: Generating the duration of the single pulse driving signal for driving the pixel unit to display the corresponding brightness of the light source in each sub-field according to a conversion relationship, and the conversion relationship includes that the product of the number of sub-frame time occupied by the single pulse driving signal for driving the pixel unit to display the corresponding brightness of the light source in each sub-field and the brightness value of the light source corresponding to each sub-field corresponds to the binary value of the data bit corresponding to each sub-field.

[0040] Differing from the prior art, the application allocates a first number of subframe times to a pixel unit according to a modulation time; divides the first number of subframe times into a second number of subfields; divides n data bits into the second number of subfields for display; determines a luminance value of a light source corresponding to each subfield according to a preset allocation mode; generates a duration of a single-pulse signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield according to a conversion relationship, the conversion relationship including that a product of the number of subframe times occupied by the duration of the single-pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield and the luminance value of the light source corresponding to each subfield corresponds to a binary value of the data bit corresponding to each subfield. In this way, the corresponding luminance of the light source is displayed by the pixel unit in the subframe time occupied by the duration of the corresponding single-pulse signal in each subfield, and the corresponding gray scale display in the binary gray scale data is realized, so that the pursuit of the number of subframe times in each color field time during the display of the gray scale can be reduced. Therefore, the application can reduce the requirement for the bandwidth of the display device.

[0041] Optionally, in step S110, n is 8, 16, 32, or 64.

[0042] Further, after the modulation time of the pixel unit, each color field time further includes a compensation subfield, the compensation subfield including a third number of subframe times, the light source being extinguished in the compensation subfield, and the sum of the first number and the third number being an exponential power of 2.

[0043] Optionally, the preset allocation mode is configured to set different luminance values of the light source corresponding to different subfields, and each subfield displays at least two data bits successively adjacent in the binary gray scale data.

[0044] Hereinafter, specific embodiments one to three are proposed for the case where n is 8. Specific embodiment one

[0046] Referring to Figure 2 , Figure 2 is Figure 1 the flowchart of step S140 in Figure 1 , a further limitation of the display driving method of the gray scale image shown in Figure 1 is proposed, and specific embodiment one of the display driving method of the gray scale image is proposed, which is further limited relative to the display driving method of the gray scale image shown in Figure 2 . As shown in , step S140 further includes steps S10 to S20.

[0047] Step S10: calculating the number of data bits required to be displayed corresponding to each subfield according to the first formula.

[0048] The first formula is: c=n / m, wherein c is the number of data bits corresponding to the display of each sub-field, n is the number of data bits in the binary grayscale data, and m is the second number.

[0049] Step S20: determining the data bits corresponding to the display of each sub-field according to the number of data bits corresponding to the display of each sub-field.

[0050] In this way, by steps S10 and S20, the number of data bits corresponding to the display of each sub-field can be reasonably allocated.

[0051] Further, the second number is 2, the first sub-field and the second sub-field are in turn the first sub-field and the second sub-field according to the order of the luminance values of the corresponding light sources from high to low, n data bits are in turn the first bit to the nth bit according to the order of the binary grayscale data from low to high, and step S20 is specifically:

[0052] determining that the first sub-field corresponds to the display of the (n / 2+1)th bit to the nth bit in the binary grayscale data, and the second sub-field corresponds to the display of the first bit to the (n / 2)th bit in the binary grayscale data.

[0053] Optionally, the first number is 30, and the first sub-field and the second sub-field each have 15 sub-frame times.

[0054] In the preset allocation mode, the ratio of the luminance value of the light source corresponding to the first sub-field to the luminance value of the light source corresponding to the second sub-field is 16:1.

[0055] In this way, by setting the ratio of the luminance value of the light source corresponding to the first sub-field to the luminance value of the light source corresponding to the second sub-field to be 16:1, the method can be applied to the case where the maximum luminous power of the pixel unit is required to be higher.

[0056] Specifically, as Figure 3 , Figure 3 is a timing diagram of an embodiment of the first embodiment of the display driving method of the grayscale image.

[0057] In this embodiment, n is 8, the first number is 30, the second number is 2, and the third number is 2. The two sub-fields are a first sub-field 31a and a second sub-field 32a, respectively. The first sub-field 31a is determined to correspond to display of the 8th bit to the 5th bit in the binary grayscale data, and the second sub-field 32a is determined to correspond to display of the 4th bit to the 1st bit in the binary grayscale data. The first sub-field 31a has a sub-frame time of 15, and the luminance value of the light source corresponding to the first sub-field 31a is 600 lumens. The second sub-field 32a has a sub-frame time of 15, and the luminance value of the light source corresponding to the second sub-field 32a is 37.5 lumens. Further, the monochrome field time further includes a compensation sub-field 33a outside the first sub-field 31a and the second sub-field 32a. The compensation sub-field 33a includes a sub-frame time of 2, so as to make the number of sub-frame times in each color field time be an exponential power of 2, i.e., the sum of the first number and the third number is an exponential power of 2 (here, the sum of the first number and the third number is 32), so as to achieve the purpose of facilitating port reading and writing. In the sub-frame time of 2 of the compensation sub-field 33a, the light source is extinguished.

[0058] Here, the product of the number of sub-frame times, i.e., 15, included in the first sub-field 31a and the luminance value, i.e., 600 lumens, of the light source corresponding to the first sub-field 31a corresponds to the sum of the weights, i.e., (240), of the 8th bit to the 5th bit in the binary grayscale data corresponding to the display of the first sub-field 31a. The product of the number of sub-frame times, i.e., 15, included in the second sub-field 32a and the luminance value, i.e., 37.5 lumens, of the light source corresponding to the second sub-field 32a corresponds to the sum of the weights, i.e., (15), of the 4th bit to the 1st bit in the binary grayscale data corresponding to the display of the second sub-field 32a.

[0059] In this way, by dividing each color field time into 32 sub-frame times, when displaying the grayscale corresponding to the binary grayscale data, the requirement for the data transmission rate is 1 / 8 of the requirement for the data transmission rate when each color field time is divided into 256 sub-frame times. Here, the ratio of the highest luminance value to the lowest luminance value in the two different luminance values is 16:1, which is suitable for a case where the requirement for the maximum light emitting power of the pixel unit is relatively high.

[0060] Specifically, as Figure 3As shown, if the binary gray scale data is (10101101), the 8th bit to the 5th bit in the binary gray scale data is (1010), and the 4th bit to the 1st bit in the binary gray scale data is (1101). At this time, the first single pulse signal 21a for driving the pixel unit to display the luminance of 600 lumens in the first subfield 31a corresponding to the bit 7 to bit 4 (1010) in the binary gray scale data has a duration of 10 subframe times, and the first single pulse signal 21a controls the corresponding pixel unit to have 10 subframe times for displaying the luminance of 600 lumens in the first subfield 31a; and the second single pulse signal 22a for driving the pixel unit to display the luminance of 37.5 lumens in the second subfield 32a corresponding to the 4th bit to the 1st bit (1010) in the binary gray scale data has a duration of 13 subframe times, and the second single pulse signal 22a controls the corresponding pixel unit to have 13 subframe times for displaying the luminance of 37.5 lumens in the second subfield 32a. In this way, the luminance of 600 lumens of 10 subframe times in the first subfield 31a and the luminance of 37.5 lumens of 13 subframe times in the second subfield 32a are matched, and the gray scale 173 corresponding to the binary gray scale data (10101101) is displayed.

[0061] Optionally, the first number is 60, the first subfield is divided into 45 subframes, and the second subfield is divided into 15 subframes.

[0062] In the preset allocation mode, the ratio of the luminance value of the light source corresponding to the first subfield to the luminance value of the light source corresponding to the second subfield is 5.3:1.

[0063] In this way, by setting the ratio of the luminance value of the light source corresponding to the first subfield to the luminance value of the light source corresponding to the second subfield to be 5.3:1, the method can be applied to the case where the requirement for the maximum luminous power of the light source module is low.

[0064] Specifically, as shown in FIG. 6, the first subfield 31a corresponding to the bit 7 to bit 4 (1010) in the binary gray scale data has a duration of 10 subframe times, and the second subfield 32a corresponding to the 4th bit to the 1st bit (1010) in the binary gray scale data has a duration of 13 subframe times. Figure 4 Figure 4 is a timing diagram of another embodiment of the display driving method of the gray scale image of the present application.

[0065] ​In this embodiment, n is 8, the first number is 60, the second number is 2, and the third number is 4. The two sub-fields are the first sub-field 31b and the second sub-field 32b, respectively. The first sub-field 31b corresponds to display the 8th to 5th bits in the binary grayscale data, and the second sub-field 32b corresponds to display the 4th to 1st bits in the binary grayscale data. The first sub-field 31b has 45 sub-frame times, and the luminance value of the light source corresponding to the first sub-field 31b is 400 lumens. The second sub-field 32b has 15 sub-frame times, and the luminance value of the light source corresponding to the second sub-field 32b is 75 lumens. Further, the monochrome field time further includes a compensation sub-field 33b outside the first sub-field 31b and the second sub-field 32b. The compensation sub-field 33b includes 4 sub-frame times to make the number of sub-frame times in each color field time an exponential power of 2, i.e., the sum of the first number and the third number is an exponential power of 2 (here, the sum of the first number and the third number is 64), so as to facilitate port reading and writing. In the 4 sub-frame times of the compensation sub-field 33b, the light source is extinguished.

[0066] The product of the number of sub-frame times included in the first sub-field 31b, i.e., 45, and the luminance value of the light source corresponding to the first sub-field 31b, i.e., 400 lumens, corresponds to the sum of the weights of the 8th to 5th bits in the binary grayscale data corresponding to the display by the first sub-field 31b, i.e., (240). The product of the number of sub-frame times included in the second sub-field 32b, i.e., 15, and the luminance value of the light source corresponding to the second sub-field 32b, i.e., 75 lumens, corresponds to the sum of the weights of the 4th to 1st bits in the binary grayscale data corresponding to the display by the second sub-field 32b, i.e., (15).

[0067] By the above manner, each color field time is divided into 64 sub-frame times. Thus, when displaying the grayscale corresponding to the binary grayscale data, the requirement for data transmission rate is 1 / 4 of the requirement for data transmission rate when each color field time is divided into 256 sub-frame times. The ratio of the highest luminance value to the lowest luminance value in the two different luminance values is 5.3:1, which is suitable for a case where the requirement for the maximum luminous power of the pixel unit module is low.

[0068] Specifically, as Figure 4As shown, the binary gray scale data is (10101101), the 8th bit to the 5th bit in the binary gray scale data is (1010), and the 4th bit to the 1st bit in the binary gray scale data is (1101). At this time, the duration of the first single pulse signal 21b for driving the pixel unit to display the luminance of 400 lumens corresponding to the bit7 bit to bit4 (1010) in the binary gray scale data in the first subfield 31b accounts for 30 subframe times, and the first single pulse signal 21b controls the corresponding pixel unit to have 30 subframe times for displaying the luminance of 400 lumens in the first subfield 31b; and the duration of the second single pulse signal 22b for driving the pixel unit to display the luminance of 75 lumens corresponding to the 4th bit to the 1st bit (1010) in the binary gray scale data in the second subfield 32b accounts for 13 subframe times, and the second single pulse signal 22b controls the corresponding pixel unit to have 13 subframe times for displaying the luminance of 75 lumens in the second subfield 32b. In this way, the luminance of 400 lumens in 30 subframe times in the first subfield 31b and the luminance of 75 lumens in 13 subframe times in the second subfield 32b are matched, and the gray scale 173 corresponding to the binary gray scale data (10101101) is displayed. Embodiment Two

[0070] The above Figure 1 Further limitation of the display driving method of the gray scale image as shown, the second embodiment of the display driving method of the gray scale image is proposed, which is relative to Figure 1 Further limitation of the display driving method of the gray scale image as shown, the second embodiment of the display driving method of the gray scale image is proposed, which is relative to

[0071] As Figure 5 As Figure 5 is a timing diagram of an embodiment of the second embodiment of the display driving method of the gray scale image of the present application.

[0072] Optionally, the first number is 63 and the third number is 1. The 3 sub-fields are respectively the first sub-field 31c, the second sub-field 32c and the third sub-field 33c, the first sub-field 31c corresponds to display the 8th bit to the 7th bit in the binary gray scale data, the second sub-field 32c corresponds to display the 6th bit to the 5th bit in the binary gray scale data, and the third sub-field 33c corresponds to display the 4th bit to the 1st bit in the binary gray scale data. The first sub-field 31c has 24 sub-frame times and the luminance value of the light source corresponding to the first sub-field 31c is 600 lumens, the second sub-field 32c has 24 sub-frame times and the luminance value of the light source corresponding to the second sub-field 32c is 150 lumens, and the third sub-field 33c has 15 sub-frame times and the luminance value of the light source corresponding to the third sub-field 33c is 75 lumens. Further, the monochrome field time further includes a compensation sub-field (not shown in the figure) outside the first sub-field and the second sub-field, the compensation sub-field includes 1 sub-frame time, so as to make the number of sub-frame times in each color field time be an exponential power of 2, that is, the sum of the first number and the third number is an exponential power of 2 (here, the sum of the first number and the third number is 64), so as to achieve the purpose of facilitating port reading and writing, and in the 1 sub-frame time of the compensation sub-field, the light source is extinguished.

[0073] The product of the number of sub-frame times contained in the first sub-field 31c, that is, 24, and the luminance value of the light source corresponding to the first sub-field 31c, that is, 600 lumens, corresponds to the sum of the weights corresponding to the 8th bit to the 7th bit in the binary gray scale data, that is, (192); the product of the number of sub-frame times contained in the second sub-field 32c, that is, 24, and the luminance value of the light source corresponding to the second sub-field 32c, that is, 150 lumens, corresponds to the sum of the weights corresponding to the 6th bit to the 5th bit in the binary gray scale data, that is, (48); and the product of the number of sub-frame times contained in the third sub-field 33c, that is, 15, and the luminance value of the light source corresponding to the third sub-field 33c, that is, 75 lumens, corresponds to the sum of the weights corresponding to the 4th bit to the 1st bit in the binary gray scale data, that is, (15).

[0074] In the above manner, each color field time is divided into 64 sub-frame times, so that when displaying the gray scale corresponding to the binary gray scale data, the requirement for the data transmission rate is 1 / 4 of the requirement for the data transmission rate when each color field time is divided into 256 sub-frame times. Among the 3 different luminance values, the ratio of the highest luminance value to the lowest luminance value is 8:1.

[0075] Specifically, as Figure 5As shown, the binary gray scale data is (10101101), the 8th to 7th bits of the binary gray scale data are (10), the 6th to 5th bits of the binary gray scale data are (10), and the 4th to 1st bits of the binary gray scale data are (1101). At this time, the first single pulse signal 21c for driving the pixel unit to display the brightness of 600 lumens in the first subfield 31c corresponding to the 8th to 7th bits (10) of the binary gray scale data has a duration of 16 subframe times, and the first single pulse signal 21c controls the corresponding pixel unit to have 16 subframe times in the first subfield 31c for displaying the brightness of 600 lumens; the second single pulse signal 22c for driving the pixel unit to display the brightness of 150 lumens in the second subfield 32c corresponding to the 6th to 5th bits (10) of the binary gray scale data has a duration of 16 subframe times, and the second single pulse signal 22c controls the corresponding pixel unit to have 16 subframe times in the second subfield 32c for displaying the brightness of 150 lumens; and the third single pulse signal 23c for driving the pixel unit to display the brightness of 75 lumens in the third subfield 33c corresponding to the 4th to 1st bits (1101) of the binary gray scale data has a duration of 13 subframe times, and the third single pulse signal 23c controls the corresponding pixel unit to have 13 subframe times in the third subfield 33c for displaying the brightness of 75 lumens. In this way, the brightness of 600 lumens of 16 subframe times in the first subfield 31c, the brightness of 150 lumens of 16 subframe times in the second subfield 32c, and the brightness of 75 lumens of 13 subframe times in the third subfield 33c are matched; and the gray scale 173 corresponding to the binary gray scale data (10101101) is displayed.

[0076] As shown, Figure 6 Figure 6 is a timing diagram of another embodiment of the second embodiment of the display driving method of the gray scale image of the present application.

[0077] ​Optionally, the first number is 59 and the third number is 5. The 3 sub-fields are respectively the first sub-field 31d and the second sub-field 32d and the third sub-field 33d, the first sub-field 31d corresponds to display the 8th bit to the 7th bit in the binary gray scale data, the second sub-field 32d corresponds to display the 6th bit to the 4th bit in the binary gray scale data, and the third sub-field 33d corresponds to display the 3rd bit to the 1st bit in the binary gray scale data. The first sub-field 31d has 24 sub-frame times and the luminance value of the light source corresponding to the first sub-field 31d is 600 lumens, the second sub-field 32d has 28 sub-frame times and the luminance value of the light source corresponding to the second sub-field 32d is 150 lumens, and the third sub-field 33d has 7 sub-frame times and the luminance value of the light source corresponding to the third sub-field 33d is 75 lumens. Further, each color field time further includes a compensation sub-field 34d outside the first sub-field 31d, the second sub-field 32d and the third sub-field 33d, the compensation sub-field 34d includes 5 sub-frame times, so as to make the number of sub-frame times in each color field time be an exponential power of 2, that is, the sum of the first number and the third number is an exponential power of 2 (here, the sum of the first number and the third number is 64), so as to achieve the purpose of facilitating port reading and writing, and the light source is extinguished in the 5 sub-frame times of the compensation sub-field 34d.

[0078] The product of the number of sub-frame times contained in the first sub-field 31d, that is, 24, and the luminance value of the light source corresponding to the first sub-field 31d, that is, 600 lumens, corresponds to the sum of the weights corresponding to the 8th bit to the 7th bit in the binary gray scale data, that is, (192); the product of the number of sub-frame times contained in the second sub-field 32d, that is, 28, and the luminance value of the light source corresponding to the second sub-field 32d, that is, 150 lumens, corresponds to the sum of the weights corresponding to the 6th bit to the 4th bit in the binary gray scale data corresponding to the second sub-field 32d, that is, (56); and the product of the number of sub-frame times contained in the third sub-field 33d, that is, 7, and the luminance value of the light source corresponding to the third sub-field 33d, that is, 75 lumens, corresponds to the sum of the weights corresponding to the 3rd bit to the 1st bit in the binary gray scale data corresponding to the third sub-field 33d, that is, (7).

[0079] In the above manner, each color field time is divided into 64 sub-frame times, so that when displaying the gray scale corresponding to the binary gray scale data, the requirement for data transmission rate is 1 / 4 of the requirement for data transmission rate when each color field time is divided into 256 sub-frame times. Among the 3 different luminance values, the ratio of the highest luminance value to the lowest luminance value is 24:7.

[0080] Specifically, as Figure 6As shown, the binary grayscale data is specifically (10101101), then the 8th to 7th bits of the binary grayscale data are (10), the 6th to 4th bits of the binary grayscale data are (101), and the 3rd to 1st bits of the binary grayscale data are (101). At this time, the duration of the first single pulse signal 21d in the first subfield 31d corresponding to the display of the 8th to 7th bits (10) of the binary grayscale data is 16 subframe times. The first single pulse signal 21d controls the corresponding pixel unit to display 600 lumens of brightness for 16 subframe times in the first subfield 31d; and the second single pulse signal 21d in the second subfield 32d corresponding to the display of the 6th to 4th bits (101) of the binary grayscale data is used to drive the pixel unit to display 150 lumens of brightness. The duration of 2d occupies 20 subframe times. The second single pulse signal 22d controls the corresponding pixel unit to have 20 subframe times within the second subfield 32d to display a brightness of 150 lumens. Furthermore, the duration of the third single pulse signal 23d, which drives the pixel unit to display a brightness of 75 lumens within the third subfield 33d corresponding to the 3rd to 1st bits (101) of the binary grayscale data, occupies 5 subframe times. The third single pulse signal 23d controls the corresponding pixel unit to have 5 subframe times within the third subfield 33d to display a brightness of 75 lumens. Thus, the brightness of 600 lumens within 16 subframe times in the first subfield 31d, the brightness of 150 lumens within 20 subframe times in the second subfield 32d, and the brightness of 75 lumens within 5 subframe times in the third subfield 33d can be coordinated, thereby displaying the grayscale 173 corresponding to the binary grayscale data (10101101). Specific Implementation Example 3

[0082] See Figure 2 , Figure 2 yes Figure 1 The flowchart of step S140 is shown above. Figure 1 Further defining the display driving method for grayscale images, a third specific embodiment of the grayscale image display driving method is proposed, which is relative to... Figure 1 The display driving method for the grayscale image shown is further limited in that, as Figure 2 As shown, step S140 further includes steps S10 to S20.

[0083] Step S10: Calculate the number of data bits required for each subfield to be displayed according to the first formula.

[0084] The first formula is: c = n / m, where c is the number of data bits required to be displayed for each subfield, n is the number of data bits in the binary grayscale data, and m is the second quantity.

[0085] Step S20: determining the data bits corresponding to each sub-field according to the number of data bits corresponding to each sub-field required to be displayed.

[0086] In this way, by steps S10 and S20, the number of data bits corresponding to each sub-field required to be displayed can be reasonably allocated.

[0087] Further, the second number is 4, and the 4 sub-fields are the first sub-field, the second sub-field, the third sub-field and the fourth sub-field in the order of the luminance values of the corresponding light sources from high to low; the n data bits are the 1st bit to the nth bit in the order of the binary grayscale data from low to high, and step S20 is specifically:

[0088] determining that the first sub-field corresponds to display of the 3n / 4+1 bit to the nth bit in the binary grayscale data, the second sub-field corresponds to display of the 2n / 4+1 bit to the 3n / 4 bit in the binary grayscale data, the third sub-field corresponds to display of the n / 4+1 bit to the 2n / 4 bit in the binary grayscale data, and the fourth sub-field corresponds to display of the 1st bit to the n / 4 bit in the binary grayscale data.

[0089] Optionally, the first number is 15, the first sub-field is divided into 6 sub-frame times, the second sub-field is divided into 3 sub-frame times, the third sub-field is divided into 3 sub-frame times, and the fourth sub-field is divided into 3 sub-frame times.

[0090] In the preset allocation mode, the ratio of the luminance value of the light source corresponding to the first sub-field to the luminance value of the light source corresponding to the fourth sub-field is 8:1.

[0091] Specifically, as Figure 7 , Figure 7 is a timing diagram of an embodiment of the third specific embodiment of the display driving method of the grayscale image of the present application.

[0092] As Figure 7As shown, n is 8, the first number is 15, the second number is 4, and the third number is 1. The four sub-fields are first sub-field 31e, second sub-field 32e, third sub-field 33e, and fourth sub-field 34e. The first sub-field 31e corresponds to display the 8th bit to the 7th bit in the binary gray scale data, the second sub-field 32e corresponds to display the 6th bit to the 5th bit in the binary gray scale data, the third sub-field 33e corresponds to display the 4th bit to the 3rd bit in the binary gray scale data, and the fourth sub-field 34e corresponds to display the 2nd bit to the 1st bit in the binary gray scale data. The first sub-field 31e has 6 sub-frame times and the luminance value of the light source corresponding to the first sub-field 31e is 600 lumens, the second sub-field 32e has 3 sub-frame times and the luminance value of the light source corresponding to the second sub-field 32e is 300 lumens, the third sub-field 33e has 3 sub-frame times and the luminance value of the light source corresponding to the third sub-field 33e is 75 lumens, and the fourth sub-field 34e has 3 sub-frame times and the luminance value of the light source corresponding to the fourth sub-field 34e is 18.75 lumens. Further, each color field time further includes a compensation sub-field 35e outside the first sub-field 31e, the second sub-field 32e, the third sub-field 33e, and the fourth sub-field 34e, and the compensation sub-field 35e includes 1 sub-frame time to make the number of sub-frame times in each color field time an exponential power of 2, i.e., the sum of the first number and the third number is an exponential power of 2 (here, the sum of the first number and the third number is 16), so as to facilitate port reading and writing. In the 1 sub-frame time of the compensation sub-field 35a, the light source is extinguished.

[0093] The product of the number of sub-frame times included in the first sub-field 31e, i.e., 6, and the luminance value of the light source corresponding to the first sub-field 31e, i.e., 600 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 8th bit to the 7th bit displayed by the first sub-field 31e, i.e., (192); the product of the number of sub-frame times included in the second sub-field 32e, i.e., 3, and the luminance value of the light source corresponding to the second sub-field 32e, i.e., 300 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 6th bit to the 5th bit displayed by the second sub-field 32e, i.e., (48); the product of the number of sub-frame times included in the third sub-field 33e, i.e., 3, and the luminance value of the light source corresponding to the third sub-field 33e, i.e., 75 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 4th bit to the 3rd bit displayed by the third sub-field 33e, i.e., (12); and the product of the number of sub-frame times included in the fourth sub-field 34e, i.e., 3, and the luminance value of the light source corresponding to the fourth sub-field 34e, i.e., 18.75 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 2nd bit to the 1st bit displayed by the fourth sub-field 34e, i.e., (3).

[0094] By dividing each color field time into 16 subframe times using the above method, the data transmission rate requirement when displaying the grayscale corresponding to binary grayscale data is 1 / 16 of the data transmission rate requirement when dividing each color field time into 256 subframe times.

[0095] For example, such as Figure 7 As shown, the binary grayscale data is (10101101), then the 8th to 7th bits of the binary grayscale data are (10), the 6th to 5th bits of the binary grayscale data are (10), the 4th to 3rd bits of the binary grayscale data are (11), and the 2nd to 1st bits of the binary grayscale data are (01). At this time, the duration of the first single-pulse signal 21e, which is used to drive the pixel unit to display a brightness of 600 lumens in the first subfield 31e corresponding to the 8th to 7th bits (10) of the binary grayscale data, occupies 4 subframe times. The first single-pulse signal 21e controls the corresponding pixel unit to have 4 subframe times in the first subfield 31e to display a brightness of 600 lumens; and the duration of the second single-pulse signal 22e, which is used to drive the pixel unit to display a brightness of 300 lumens in the second subfield 32e corresponding to the 6th to 5th bits (10) of the binary grayscale data, occupies 2 subframe times. The second single-pulse signal 22e controls the corresponding pixel unit to have 2 subframe times in the second subfield 32e to display a brightness of 300 lumens; and The duration of the third single pulse signal 23e, which is used to drive the pixel unit to display a brightness of 75 lumens in the third subfield 33e corresponding to the 4th to 3rd bits (11) of the binary grayscale data, is 3 subframes. The third single pulse signal 23e controls the corresponding pixel unit to have 3 subframes in the third subfield 33e to display a brightness of 75 lumens. The duration of the fourth single pulse signal 24e, which is used to drive the pixel unit to display a brightness of 18.75 lumens in the fourth subfield 34e corresponding to the 2nd to 1st bits (01) of the binary grayscale data, is 1 subframe. The fourth single pulse signal 24e controls the corresponding pixel unit to have 1 subframe in the fourth subfield 34e to display a brightness of 18.75 lumens. In this way, the brightness of 600 lumens for 4 subframes in the first subfield 31e, the brightness of 300 lumens for 2 subframes in the second subfield 32e, the brightness of 75 lumens for 3 subframes in the third subfield 33e, and the brightness of 18.75 lumens for 1 subframe in the fourth subfield 34e can be combined to display the grayscale 173 corresponding to the binary grayscale data (10101101).

[0096] For example, such as Figure 8 As shown, Figure 8 This is a timing diagram of another embodiment of the grayscale image display driving method of this application.

[0097] n is 8, the first number is 15, the second number is 4, and the third number is 1. The four sub-fields are a first sub-field 31f, a second sub-field 32f, a third sub-field 33f, and a fourth sub-field 34f. The first sub-field 31f corresponds to displaying the 8th bit to the 7th bit in the binary gray scale data, the second sub-field 32f corresponds to displaying the 6th bit to the 5th bit in the binary gray scale data, the third sub-field 33f corresponds to displaying the 4th bit to the 3rd bit in the binary gray scale data, and the fourth sub-field 34f corresponds to displaying the 2nd bit to the 1st bit in the binary gray scale data. The first sub-field 31f has 6 sub-frame times and the luminance value of the light source corresponding to the first sub-field 31f is 600 lumens, the second sub-field 32f has 3 sub-frame times and the luminance value of the light source corresponding to the second sub-field 32f is 300 lumens, the third sub-field 33f has 3 sub-frame times and the luminance value of the light source corresponding to the third sub-field 33f is 75 lumens, and the fourth sub-field 34f has 3 sub-frame times and the luminance value of the light source corresponding to the fourth sub-field 34f is 18.75 lumens. Further, each color field time further includes a compensation sub-field (not shown in the figure) outside the first sub-field 31f, the second sub-field 32f, the third sub-field 33f, and the fourth sub-field 34f. The compensation sub-field includes 1 sub-frame time to make the number of sub-frame times in each color field time an exponential power of 2, i.e., the sum of the first number and the third number is an exponential power of 2 (here, the sum of the first number and the third number is 16), so as to facilitate port reading and writing. In the 1 sub-frame time of the compensation sub-field, the light source is extinguished.

[0098] The product of the number of sub-frame times included in the first sub-field 31f, i.e., 6, and the luminance value of the light source corresponding to the first sub-field 31f, i.e., 600 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 8th bit to the 7th bit displayed by the first sub-field 31f, i.e., (192); the product of the number of sub-frame times included in the second sub-field 32f, i.e., 3, and the luminance value of the light source corresponding to the second sub-field 32f, i.e., 300 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 6th bit to the 5th bit displayed by the second sub-field 32f, i.e., (48); the product of the number of sub-frame times included in the third sub-field 33f, i.e., 3, and the luminance value of the light source corresponding to the third sub-field 33f, i.e., 75 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 4th bit to the 3rd bit displayed by the third sub-field 33f, i.e., (12); and the product of the number of sub-frame times included in the fourth sub-field 34f, i.e., 3, and the luminance value of the light source corresponding to the fourth sub-field 34f, i.e., 18.75 lumens, corresponds to the sum of the weights in the binary gray scale data corresponding to the 2nd bit to the 1st bit displayed by the fourth sub-field 34f, i.e., (3).

[0099] In this way, each color field time is divided into 16 sub-frame times, so that when displaying the gray scale corresponding to the binary gray scale data, the requirement for data transmission rate is 1 / 16 of the requirement for data transmission rate when each color field time is divided into 256 sub-frame times.

[0100] Specifically, as shown in Figure 8 the binary gray scale data is (10011011), the 8th to 7th bits in the binary gray scale data are (10), the 6th to 5th bits in the binary gray scale data are (01), the 4th to 3rd bits in the binary gray scale data are (10), and the 2nd to 1st bits in the binary gray scale data are (11). At this time, the duration of the first single pulse signal 21f for driving the pixel unit to display a luminance of 600 lumens in the first sub-field 31f corresponding to the 8th to 7th bits (10) in the binary gray scale data accounts for 4 sub-frame times, and the first single pulse signal 21f controls the corresponding pixel unit to have 4 sub-frame times for displaying a luminance of 600 lumens in the first sub-field 31f; the duration of the second single pulse signal 22f for driving the pixel unit to display a luminance of 300 lumens in the second sub-field 32f corresponding to the 6th to 5th bits (01) in the binary gray scale data accounts for 1 sub-frame time, and the second single pulse signal 22f controls the corresponding pixel unit to have 1 sub-frame time for displaying a luminance of 300 lumens in the second sub-field 32f; the duration of the third single pulse signal 23f for driving the pixel unit to display a luminance of 75 lumens in the third sub-field 33f corresponding to the 4th to 3rd bits (10) in the binary gray scale data accounts for 2 sub-frame times, and the third single pulse signal 23f controls the corresponding pixel unit to have 2 sub-frame times for displaying a luminance of 75 lumens in the third sub-field 33f; and the duration of the fourth single pulse signal 24f for driving the pixel unit to display a luminance of 18.75 lumens in the fourth sub-field 34f corresponding to the 2nd to 1st bits (11) in the binary gray scale data accounts for 3 sub-frame times, and the fourth single pulse signal 24f controls the corresponding pixel unit to have 3 sub-frame times for displaying a luminance of 18.75 lumens in the fourth sub-field 34f. In this way, the luminance of 600 lumens in 4 sub-frame times in the first sub-field 31f, the luminance of 300 lumens in 1 sub-frame time in the second sub-field 32f, the luminance of 75 lumens in 2 sub-frame times in the third sub-field 33f, and the luminance of 18.75 lumens in 3 sub-frame times in the fourth sub-field 34f are matched to display the gray scale 155 corresponding to the binary gray scale data (10011011).

[0101] Referring to Figure 9 , Figure 9 is a schematic diagram of a module of the display driving chip.

[0102] As Figure 9As shown, the display driving chip 200 comprises an acquisition module 210, a gray data distribution module 220, a pulse modulation module 230 and an output module 240.

[0103] The acquisition module 210 is configured to acquire a pixel unit modulation time in each color field time when a current frame image to be displayed is displayed, and the gray data of the image is binary gray data, and the binary gray data comprises n data bits.

[0104] The gray data distribution module 220 is configured to distribute the pixel unit modulation time into a first number of subframe times, and divide the first number of subframe times into a second number of subfields, divide the n data bits into the second number of subfields for display, and determine a luminance value of a light source corresponding to each subfield according to a preset distribution mode, and the second number is a plurality.

[0105] The pulse modulation module 230 is configured to generate a duration of a single pulse driving signal for driving a pixel unit to display a corresponding luminance of a light source in each subfield according to a conversion relationship, and the conversion relationship comprises that a product of a number of subframe times occupied by the duration of the single pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield and the luminance value of the light source corresponding to each subfield corresponds to a binary value of a data bit corresponding to each subfield.

[0106] The output module 240 is configured to output the single pulse driving signal for driving the pixel unit to display the corresponding luminance of the light source in each subfield.

[0107] Referring to Figure 10 , Figure 10 is a schematic diagram of a module of the display device.

[0108] As shown in Figure 10 , the display device 300 comprises a display driving chip 310, a display panel 320 and a light source 330, and the display panel is provided with a pixel unit 321. The display driving chip 310 performs the above-mentioned display driving method of the gray image when driving the display panel 320 to display an image.

[0109] The display driving chip 310 is coupled to the light source 330 and the display panel 320 respectively, the light source 330 is configured to provide illumination to the display panel 320, and the pixel unit 321 is configured to switch between displaying a luminance of the light source 330 and not displaying the luminance of the light source 330.

[0110] In an embodiment, each pixel unit 321 can comprise a pixel electrode (not shown in the figure), a common electrode (not shown in the figure) and a liquid crystal (not shown in the figure), and the liquid crystal is interposed between the pixel electrode and the common electrode. In this way, the pixel unit can display or not display the corresponding luminance of the light source 330 by adjusting the state of the liquid crystal.

[0111] In an embodiment, the light source 330 and the display panel 320 can be separate structures, and the display panel 320 can be configured as a reflective panel. Specifically, the liquid crystal switches between reflecting the illumination light of the light source 330 and not reflecting the illumination light of the light source 330, and when the liquid crystal reflects the illumination light of the light source 330, the pixel unit 321 displays the brightness of the light source 330, and when the liquid crystal does not reflect the illumination light of the light source 330, the pixel unit 321 does not display the brightness of the light source 330.

[0112] In an embodiment, the light source 330 and the display panel 320 can be integrated into one structure, and the display panel 320 can be configured as a transmissive panel. Specifically, the liquid crystal switches between transmitting the illumination light of the light source 330 and not transmitting the illumination light of the light source 330, and when the liquid crystal transmits the illumination light of the light source 330, the pixel unit 321 displays the brightness of the light source 330, and when the liquid crystal does not transmit the illumination light of the light source 330, the pixel unit 321 does not display the brightness of the light source 330.

[0113] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A grayscale image display driving method, applied to a display device, the display device comprising a light source and a display panel, the display panel being provided with pixel units, characterized in that, The grayscale display driving method includes: Obtain the pixel unit modulation time during each color field time when the current frame image to be displayed is displayed, wherein the grayscale data of the image is binary grayscale data and the binary grayscale data contains n data bits; Allocate a first number of subframe times to the modulation time of the pixel unit; The first number of subframe times is divided into a second number of subfields, where the second number is multiple. The n data bits are divided into the second number of subfields for display; The brightness value of the light source corresponding to each sub-location is determined according to a preset allocation method; The duration of the single-pulse drive signal used to drive the pixel unit to display the corresponding brightness of the light source in each subfield is generated according to the conversion relationship. The conversion relationship includes: the product of the number of subframe times occupied by the duration of the single-pulse drive signal used to drive the pixel unit to display the corresponding brightness of the light source in each subfield and the brightness value of the light source corresponding to each subfield, and the binary value of the data bit displayed in each subfield. In the preset allocation method, the product of the number of subframe times contained in each sub-location and the brightness value of the light source corresponding to each sub-location is further correlated with the weight of the data bit displayed in each sub-location in the binary grayscale data.

2. The display driving method as described in claim 1, characterized in that, The step of dividing the n data bits into the second number of subfields for display includes: The number of data bits required to be displayed for each subfield is calculated according to the first formula, which is: c=n / m Where c is the number of data bits to be displayed for each subfield, n is the number of data bits in the binary grayscale data, and m is the second quantity; The number of data bits to be displayed for each subfield is determined based on the number of data bits required to be displayed for each subfield. The second quantity is 2, and the two subfields are ordered as the first subfield and the second subfield in descending order of the brightness value of the corresponding light source; The n data bits are arranged sequentially from the least significant bit to the most significant bit in the binary grayscale data, from the first bit to the nth bit. Determining the data bits to be displayed for each sub-field based on the number of data bits required for each sub-field includes: The first subfield is determined to display bits n / 2+1 to n in the binary grayscale data, and the second subfield is determined to display bits 1 to n / 2 in the binary grayscale data.

3. The display driving method as described in claim 2, characterized in that, The first quantity is 30, and the first subfield and the second subfield are each divided into 15 subframe times; in the preset allocation method, the ratio of the brightness value of the light source corresponding to the first subfield to the brightness value of the light source corresponding to the second subfield is set to 16:

1.

4. The display driving method as described in claim 2, characterized in that, The first quantity is 60, the first subfield is divided into 45 sub-frame times, the second subfield is divided into 15 sub-frame times, and the preset allocation method sets the ratio of the brightness value of the light source corresponding to the first subfield to the brightness value of the light source corresponding to the second subfield to be 5.3:

1.

5. The display driving method as described in claim 2, characterized in that, The second quantity is 4. The four subfields are ordered from high to low brightness values ​​of the corresponding light sources as the first subfield, the second subfield, the third subfield, and the fourth subfield. The n data bits are ordered from the least significant bit to the most significant bit in the binary grayscale data as bits 1 to n. Determining the number of data bits to be displayed for each subfield based on the number of data bits required for each subfield includes: The first subfield is determined to display bits 3n / 4+1 to n in the binary grayscale data, the second subfield is determined to display bits 2n / 4+1 to 3n / 4 in the binary grayscale data, the third subfield is determined to display bits n / 4+1 to 2n / 4 in the binary grayscale data, and the fourth subfield is determined to display bits 1 to n / 4 in the binary grayscale data.

6. The display driving method as described in claim 5, characterized in that, The first quantity is 15, the first subfield is divided into 6 subframe times, the second subfield is divided into 3 subframe times, the third subfield is divided into 3 subframe times, and the fourth subfield is divided into 3 subframe times; In the preset allocation method, the ratio of the brightness value of the light source corresponding to the first sub-location to the brightness value of the light source corresponding to the fourth sub-location is set to 8:

1.

7. The display driving method according to any one of claims 1 to 6, characterized in that, Also includes: After the pixel unit modulation time, each color field time also includes a compensation subfield, which contains a third number of subframe times during which the light source is turned off, and the sum of the first number and the third number is a power of 2.

8. A display driver chip, applied in a display device, the display device comprising a light source and a display panel, the display panel being provided with pixel units, characterized in that, The display driver chip executes the display driving method as described in any one of claims 1 to 7 when driving the display panel to display images.

9. A display device, the display device comprising: light source; Display panel, and The display driver chip executes the display driving method as described in any one of claims 1 to 7 when driving the display panel to display an image.

Images