Field sequential liquid crystal display and backlight control method of field sequential liquid crystal display

Abstract

The invention discloses a field sequential liquid crystal display and a backlight control method of the field sequential liquid crystal display. The display comprises a liquid crystal panel, a field sequential backlight unit and a control unit, and the control unit determines pixel partitions based on backlight partitions of the field sequential backlight unit; in any sub-field sequence, determining a target pixel value corresponding to the pixel partition according to the pixel value of the sub-frame image; according to the target pixel value and the target pixel value in the previous sub-field sequence, determining the actual flipping response duration of the liquid crystal molecules; determining a target backlight control signal according to the preset data writing time length, the actual overturning response time length, the preset backlight time length and the sub-field sequence period; the field order backlight unit starts backlight under the control of the target backlight control signal; and the liquid crystal panel displays the to-be-displayed frame image after backlight is turned on. The target backlight control signal is determined according to the actual flip response duration, so that the number of liquid crystal molecules completing flip response is increased, the color separation phenomenon is weakened, and the display effect of the field sequential liquid crystal display is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display, and in particular to a field sequential liquid crystal display and a backlight control method of the field sequential liquid crystal display. Background Art

[0002] With the development of liquid crystal display technology, field sequential liquid crystal display technology is booming as a new display technology different from traditional methods. Field sequential liquid crystal display technology is to light up the field sequential backlight of different colors in sequence, and display the color effect with the liquid crystal panel. Compared with traditional liquid crystal display technology, the filter of the traditional display can be removed to save costs, and the absorption of the filter on the backlight can be removed to reduce power consumption and energy loss, while improving color contrast. Therefore, field sequential displays are becoming more and more popular in the industry.

[0003] However, compared with traditional LCDs, field sequential LCDs have higher requirements for refresh rates. For example, traditional LCDs display images at 60Hz, while field sequential LCDs require 180Hz. The liquid crystal molecules in field sequential LCDs are voltage-driven flip devices, not instantaneous responses. High refresh rates require the response speed of liquid crystal molecules to be fast enough, but the response speed of liquid crystal molecules is related to their molecular materials and has a nonlinear relationship with the driving voltage, which is currently difficult to improve. Since field sequential LCDs currently light up backlights of different colors in sequence and synthesize complete frame color images through the integration effect of the human eye, field sequential LCDs have the phenomenon of color separation when the LCD panel displays images. Summary of the invention

[0004] The invention provides a field sequential liquid crystal display and a backlight control method of the field sequential liquid crystal display, which are used to improve the color separation phenomenon existing in the display picture of the field sequential liquid crystal display during use.

[0005] In a first aspect, an embodiment of the present invention provides a field sequential liquid crystal display, comprising a liquid crystal panel, a plurality of field sequential backlight units and a control unit, wherein:

[0006] The control unit is used to perform the following operations:

[0007] Determining pixel partitions in the liquid crystal panel based on backlight partitions in the plurality of field sequential backlight units, wherein the plurality of field sequential backlight units correspond to a plurality of sub-frame images in a frame image to be displayed;

[0008] In the subfield sequence corresponding to any subframe image, the following operations are performed:

[0009] Determining a target pixel value corresponding to the pixel partition according to the pixel value of the subframe image;

[0010] Determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence;

[0011] Determine a target backlight control signal for controlling a backlight partition corresponding to the pixel partition according to a preset data writing duration, the actual flip response duration, a preset backlight duration, and a subfield sequence period, wherein the subfield sequence period is determined according to a refresh frequency of the field sequential liquid crystal display;

[0012] The field sequential backlight unit is used to turn on the backlight under the control of the target backlight control signal;

[0013] The liquid crystal panel is used to display the frame image to be displayed after the field sequential backlight unit turns on the backlight.

[0014] In the field sequential liquid crystal display provided by the embodiment of the present invention, the control unit calculates the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value corresponding to the pixel partition in the current subfield sequence and the target pixel value in the previous subfield sequence, and determines the target backlight control signal for controlling the field sequence backlight unit to turn on the backlight according to the subfield sequence period, the preset data writing time, the aforementioned actual flip response time and the preset backlight time. Since the actual flip response time is determined according to the pixel value, when the target backlight control signal controls the field sequence backlight unit to turn on the backlight, the number of liquid crystal molecules that complete the flip response in the liquid crystal panel increases, which effectively reduces the color separation phenomenon of the liquid crystal panel when displaying the frame image to be displayed, thereby improving the display effect of the field sequential liquid crystal display.

[0015] In an optional implementation, the control unit is specifically configured to:

[0016] For any one of the pixel partitions, perform the following operations:

[0017] Selecting at least one intermediate pixel value from the pixel values ​​of the subframe image, wherein the at least one intermediate pixel value is a pixel value corresponding to a pixel located in the pixel partition;

[0018] According to different pixel values, the intermediate pixel values ​​with the same value are counted to obtain the number of intermediate pixel values ​​of each value;

[0019] The middle pixel value corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition.

[0020] The above-mentioned display, for any pixel partition, counts the pixel values ​​corresponding to the pixels in the pixel partition, and uses the pixel value corresponding to the largest number of values ​​as the target pixel value corresponding to the pixel partition, so that within the actual flip response time determined according to the target pixel value, the number of liquid crystal molecules that complete the flip response in the pixel area is large, and the liquid crystal response is more sufficient, thereby improving the display effect of the liquid crystal display.

[0021] In an optional implementation, the control unit is specifically configured to:

[0022] According to the pixel partition corresponding to the target pixel value, a target pixel value corresponding to the same pixel partition is selected from the target pixel values ​​of the previous sub-field sequence as the historical target pixel value;

[0023] The target pixel value and the historical target pixel value are mapped to obtain the actual flip response time of the liquid crystal molecules corresponding to the pixel partition.

[0024] The above display determines the actual flip response time of the liquid crystal molecules through the pixel values ​​corresponding to two adjacent sub-field sequences, so that the flip response of the liquid crystal molecules is completed more fully within the actual flip response time, thereby reducing the color separation phenomenon of the displayed image and improving the display effect of the liquid crystal display.

[0025] In an optional implementation, the control unit is specifically configured to:

[0026] Determine an actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration, and compare the actual subfield sequence duration with the subfield sequence period;

[0027] According to the comparison result and based on the actual flip response time and the preset data writing time, the reference backlight control signal is adjusted to obtain the target backlight control signal.

[0028] The above-mentioned display determines the actual subfield sequence duration through the preset data writing duration, the actual flip response duration and the preset backlight duration, and compares the actual subfield sequence duration with the subfield sequence period, and determines the target backlight control signal according to the comparison result, so that the field sequence backlight unit turns on the backlight under the control of the target backlight control signal; since the aforementioned actual flip response duration is determined according to the pixel value, it is ensured that when the field sequence backlight unit turns on the backlight, the liquid crystal molecules complete the flip response more fully, thereby improving the color separation phenomenon.

[0029] In an optional implementation manner, if one backlight partition corresponds to one pixel partition, the control unit is specifically configured to:

[0030] Using the actual flip response duration as the target flip response duration;

[0031] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual sub-field sequence duration.

[0032] In an optional implementation manner, if one backlight partition corresponds to multiple pixel partitions, the control unit is specifically configured to:

[0033] Taking the maximum value among a plurality of actual flip response time lengths as the target flip response time length, wherein the plurality of pixel partitions corresponding to the plurality of actual flip response time lengths correspond to the same backlight partition;

[0034] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual sub-field sequence duration.

[0035] The display described above realizes more refined backlight control by setting one backlight partition to correspond to at least one pixel partition, thereby improving the display effect of the field sequential liquid crystal display.

[0036] In an optional implementation, the control unit is specifically configured to:

[0037] Using the end time of the preset data writing duration as the start time of the target response flipping duration, and using the end time of the target response flipping duration as the start time of the effective duration of the target backlight control signal;

[0038] If the comparison result is that the actual subfield sequence duration is less than the subfield sequence period, then keeping the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal;

[0039] If the comparison result is that the actual subfield sequence duration is not less than the subfield sequence period, the position of the subfield sequence in the frame image to be displayed is determined, and the reference backlight control signal is adjusted according to the determination result to obtain the target backlight control signal.

[0040] In the above-mentioned display, after data writing is completed, the liquid crystal molecules begin to flip in response, and when the target flip response time is reached, the field sequential backlight unit is immediately controlled to turn on the backlight, thereby ensuring that the liquid crystal molecules fully respond while reserving sufficient time for the subsequent sub-field sequence, so that the display effect of the field sequential liquid crystal display is improved.

[0041] In an optional implementation, the control unit is specifically configured to:

[0042] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, then keeping the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal;

[0043] If the subfield sequence is the last subfield sequence in the frame image to be displayed, then increasing the relevant parameters of the reference backlight control signal to obtain the target backlight control signal;

[0044] The relevant parameters include duty cycle and / or amplitude value.

[0045] For the above-mentioned display, if the actual subfield sequence duration corresponding to any other subfield sequence except the last subfield sequence in the frame image to be displayed is greater than the subfield sequence period, the duration corresponding to the last subfield sequence in the displayed frame image will be less than the subfield sequence period, so that the actual backlight-on duration is less than the preset backlight duration. At this time, the backlight brightness is increased by increasing the relevant parameters of the reference backlight control signal, so that the field sequential backlight unit can reach the required backlight brightness in a shorter time, thereby ensuring the display effect of the field sequential liquid crystal display.

[0046] In an optional implementation, the control unit is further configured to:

[0047] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, the end time of the actual subfield sequence duration is used as the start time of the next subfield sequence;

[0048] If the subfield sequence is the last subfield sequence in the frame image to be displayed, the end time of the subfield sequence period is used as the start time of the next subfield sequence.

[0049] The above-mentioned display uses the end time of the actual subfield sequence duration of the current subfield sequence as the start time of the next subfield sequence. If the response speed of the liquid crystal molecules in the current subfield sequence is fast, the duration of the current subfield sequence can be shortened, thereby reserving more liquid crystal response time for subsequent subfield sequences; if the response speed of the liquid crystal molecules in the current subfield sequence is slow, it can ensure that the liquid crystal molecules fully respond, thereby improving the display effect of the field sequential liquid crystal display.

[0050] In a second aspect, an embodiment of the present invention provides a backlight control method for a field sequential liquid crystal display, which is applied to the field sequential liquid crystal display as described in any embodiment of the first aspect, and the method includes:

[0051] Determining pixel partitions in a liquid crystal panel based on distribution of backlight partitions in a plurality of field sequential backlight units, wherein the plurality of field sequential backlight units correspond to a plurality of sub-frame images in a frame image to be displayed;

[0052] In the subfield sequence corresponding to any subframe image, the following operations are performed:

[0053] Determining a target pixel value corresponding to the pixel partition according to the pixel value of the subframe image;

[0054] Determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence;

[0055] Determine, according to a preset data writing duration, the actual flip response duration, a preset backlight duration and a subfield sequence period, a target backlight control signal for controlling a backlight partition corresponding to the pixel partition, so that the liquid crystal panel displays the frame image to be displayed after the field sequence backlight unit turns on the backlight;

[0056] Wherein, the sub-field sequence period is determined according to the refresh frequency of the field sequential liquid crystal display.

[0057] In an optional implementation, determining the target pixel value corresponding to the pixel partition according to the pixel value of the subframe image includes:

[0058] For any one of the pixel partitions, perform the following operations:

[0059] Selecting at least one intermediate pixel value from the pixel values ​​of the subframe image, wherein the at least one intermediate pixel value is a pixel value corresponding to a pixel located in the pixel partition;

[0060] According to different pixel values, the intermediate pixel values ​​with the same value are counted to obtain the number of intermediate pixel values ​​of each value;

[0061] The middle pixel value corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition.

[0062] In an optional implementation, determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence includes:

[0063] According to the pixel partition corresponding to the target pixel value, a target pixel value corresponding to the same pixel partition is selected from the target pixel values ​​of the previous sub-field sequence as the historical target pixel value;

[0064] The target pixel value and the historical target pixel value are mapped to obtain the actual flip response time of the liquid crystal molecules corresponding to the pixel partition.

[0065] In an optional implementation, determining a target backlight control signal for controlling a backlight partition corresponding to the pixel partition according to a preset data writing duration, the actual flip response duration, a preset backlight duration, and a subfield sequence period includes:

[0066] Determine an actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration, and compare the actual subfield sequence duration with the subfield sequence period;

[0067] According to the comparison result and based on the actual flip response time and the preset data writing time, the reference backlight control signal is adjusted to obtain the target backlight control signal.

[0068] In an optional implementation, if one backlight partition corresponds to one pixel partition, determining the actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration includes:

[0069] Using the actual flip response duration as the target flip response duration;

[0070] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual sub-field sequence duration.

[0071] In an optional implementation, if one backlight partition corresponds to multiple pixel partitions, determining the actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration includes:

[0072] Taking the maximum value among a plurality of actual flip response time lengths as the target flip response time length, wherein the plurality of pixel partitions corresponding to the plurality of actual flip response time lengths correspond to the same backlight partition;

[0073] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual sub-field sequence duration.

[0074] In an optional implementation, adjusting the reference backlight control signal according to the comparison result and based on the actual flip response duration and the preset data writing duration to obtain the target backlight control signal includes:

[0075] Using the end time of the preset data writing duration as the start time of the target response flipping duration, and using the end time of the target response flipping duration as the start time of the effective duration of the target backlight control signal;

[0076] If the comparison result is that the actual subfield sequence duration is less than the subfield sequence period, then keeping the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal;

[0077] If the comparison result is that the actual subfield sequence duration is not less than the subfield sequence period, the position of the subfield sequence in the frame image to be displayed is determined, and the reference backlight control signal is adjusted according to the determination result to obtain the target backlight control signal.

[0078] In an optional implementation manner, determining the position of the subfield sequence in the frame image to be displayed, and adjusting the reference backlight control signal according to the determination result to obtain the target backlight control signal includes:

[0079] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, then keeping the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal;

[0080] If the subfield sequence is the last subfield sequence in the frame image to be displayed, then increasing the relevant parameters of the reference backlight control signal to obtain the target backlight control signal;

[0081] The relevant parameters include duty cycle and / or amplitude value.

[0082] In an optional embodiment, the method further includes:

[0083] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, the end time of the actual subfield sequence duration is used as the start time of the next subfield sequence;

[0084] If the subfield sequence is the last subfield sequence in the frame image to be displayed, the end time of the subfield sequence period is used as the start time of the next subfield sequence.

[0085] In addition, the technical effects brought about by any implementation in the second aspect can refer to the technical effects brought about by different implementations in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0087] Figure 1A schematic diagram of an application scenario of a field sequential liquid crystal display provided by an embodiment of the present invention;

[0088] Figure 2 A schematic diagram of the structure of a field sequential liquid crystal display provided by an embodiment of the present invention;

[0089] Figure 3 A schematic diagram of a working process of a field sequential liquid crystal display provided by an embodiment of the present invention;

[0090] Figure 4 A schematic structural diagram of another field sequential liquid crystal display provided by an embodiment of the present invention;

[0091] Figure 5 A waveform diagram of a data driving signal and a backlight control signal provided by an embodiment of the present invention;

[0092] Figure 6 A schematic diagram of a working process for determining a target backlight control signal for a field sequential liquid crystal display provided by an embodiment of the present invention;

[0093] Figure 7 A waveform diagram of a data driving signal and a target backlight control signal provided by an embodiment of the present invention;

[0094] Figure 8 A waveform diagram of another data driving signal and a target backlight control signal provided by an embodiment of the present invention;

[0095] Fig. 9 A waveform diagram of another data driving signal and a target backlight control signal provided by an embodiment of the present invention;

[0096] Fig.10 A schematic diagram of a complete working process of a field sequential liquid crystal display provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0097] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0098] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0099] The design concept of the embodiment of the present invention is briefly introduced below:

[0100] Field sequential liquid crystal display technology is one of the methods for display devices to achieve color display. The principle of this technology is: in field sequential display, a frame image to be displayed is divided into multiple monochrome color component images (hereinafter referred to as sub-frame images in the embodiment of the present invention) according to different color channels, the display time of a frame image is recorded as a field sequence, and the field sequence is divided into multiple sub-field sequences corresponding to the sub-frame images one by one. The sub-frame images are displayed in the corresponding sub-field sequences. In a field sequence, multiple sub-frame images are switched quickly, and the integration effect of the human eye is used to achieve color superposition in time, thereby achieving color display.

[0101] A liquid crystal display that uses the above field sequential liquid crystal display technology to achieve color display is called a field sequential color liquid crystal display (FSC-LCD), which can also be referred to as a field sequential liquid crystal display. The field sequential liquid crystal display includes a liquid crystal panel and a backlight module, wherein:

[0102] The backlight module is arranged on a side away from the display side of the liquid crystal panel, and provides the liquid crystal panel with a field sequence backlight corresponding to the subfield sequence. In the subfield sequence, pixel driving data corresponding to the subframe image (hereinafter referred to as image data in the embodiment of the present invention) is written to the liquid crystal panel. After the image data is written, the liquid crystal molecules in the liquid crystal panel are driven and moved to the position corresponding to the subframe image; then, the backlight module is controlled to turn on the field sequence backlight unit corresponding to the subfield sequence, and the light transmittance of the backlight passing through the liquid crystal panel is controlled by flipping the liquid crystal molecules, so as to realize the display of the subframe image in the corresponding subfield sequence.

[0103] However, compared to traditional LCDs, field sequential LCDs have higher requirements for refresh rates. For example, traditional LCDs display images at 60Hz, while field sequential LCDs require 180Hz. High refresh rates require that the response speed of liquid crystal molecules is fast enough, but the response speed of liquid crystal molecules is related to their molecular materials, and it is currently difficult to improve. Therefore, field sequential LCDs are prone to problems such as smearing and blurred display during use. In addition, since field sequential LCDs light up backlights of different colors in sequence and synthesize a complete frame color image through the integration effect of the human eye, there will also be a phenomenon of color separation in the image displayed by the LCD panel during use.

[0104] In the related art, a fixed flip response time is usually set so that the liquid crystal molecules respond to flipping within the fixed flip response time. However, since the display-related information of different sub-frame images is different, the flip response speed of the liquid crystal molecules in the sub-field sequences corresponding to different sub-frame images is also different. For the sub-field sequence with a slow flip response speed, the liquid crystal molecules cannot fully respond within the fixed flip response time, thereby reducing the image display effect and even causing color separation.

[0105] Based on this, an embodiment of the present invention provides a field sequential liquid crystal display and a backlight control method for a field sequential liquid crystal display. By controlling the moment when a field sequential backlight unit turns on the backlight, the number of liquid crystal molecules that complete the flipping response in the liquid crystal panel is increased, thereby reducing the color separation phenomenon of the liquid crystal panel when displaying a frame image to be displayed, thereby improving the display effect of the field sequential liquid crystal display.

[0106] The application scenarios of the field sequential liquid crystal display provided by the present invention are introduced below in conjunction with the accompanying drawings:

[0107] like Figure 1 As shown, the application scenario includes a field sequential liquid crystal display 10 and a server 20, wherein:

[0108] The field sequential LCD 10 and the server 20 are connected via Internet communication, wherein the server 20 sends relevant data of the frame image to be displayed to the field sequential LCD 10, and the field sequential LCD 10 displays the frame image to be displayed based on the received relevant data and using the method provided in the embodiment of the present invention.

[0109] Of course, the method provided in the embodiment of the present invention is not limited to Figure 1 The application scenario shown may also be used in other possible application scenarios, and the embodiments of the present invention do not impose any limitation thereto.

[0110] After introducing the application scenarios of the embodiments of the present invention, the preferred implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other if there is no conflict.

[0111] Figure 2 FIG. 1 shows a schematic diagram of a structure of a field sequential liquid crystal display provided by an embodiment of the present invention. Figure 2 As shown, the field sequential liquid crystal display 200 includes a liquid crystal panel 201, a plurality of field sequential backlight units 202 and a control unit 203, wherein:

[0112] A plurality of field sequential backlight units 202 are arranged on a side away from the display side of the liquid crystal panel 201, and each field sequential backlight unit includes a group of monochrome backlight sources and a driving circuit for driving the monochrome backlight source;

[0113] The control unit 203 is electrically connected to the liquid crystal display panel 201 and the plurality of field sequential backlight units 202 respectively;

[0114] like Figure 3 As shown, the control unit 203 is used to perform the following operations:

[0115] Step S301, determining pixel partitions in the liquid crystal panel 201 based on backlight partitions in a plurality of field sequential backlight units 202, wherein the plurality of field sequential backlight units 202 correspond to a plurality of sub-frame images in a frame image to be displayed;

[0116] In one or more embodiments, a frame image to be displayed includes multiple sub-frame images, and the multiple sub-frame images correspond one-to-one to multiple field sequence backlight units 202. The field sequential liquid crystal display 200 displays a frame image to be displayed for a display duration of one field sequence, and the display duration of each sub-frame image is one sub-field sequence.

[0117] In a specific implementation, according to the three-primary color principle, a frame image to be displayed is composed of three monochrome sub-frame images, namely a red sub-frame image, a green sub-frame image and a blue sub-frame image, and the image data corresponding to each sub-frame image includes pixel values.

[0118] In an optional implementation, the control unit 203 determines at least one pixel partition in the liquid crystal panel 201 according to the distribution of backlight partitions in any one of the plurality of field sequential backlight units 202 .

[0119] In a specific implementation, if the field sequential backlight unit adopts the global dimming mode, the field sequential backlight unit includes one backlight partition; if the field sequential backlight unit adopts the local dimming mode, the field sequential backlight unit includes multiple backlight partitions.

[0120] It should be noted that the backlight sources in the multiple field sequential backlight units in the embodiment of the present invention can be red, green and blue backlight sources, cyan, yellow and magenta backlight sources, or other colors of backlight sources, and the embodiment of the present invention does not impose any restrictions on this.

[0121] In one or more embodiments, one backlight partition corresponds to at least one pixel partition.

[0122] Exemplarily, assuming that the field sequential backlight unit includes 4×6 backlight partitions, it can be set that each backlight partition corresponds to a pixel partition.

[0123] Exemplarily, assuming that the field sequential backlight unit includes 4×6 backlight partitions, each backlight partition may be set to correspond to 4 pixel partitions.

[0124] By setting the number of pixel partitions to be greater than or equal to the number of backlight partitions, more refined backlight control can be achieved, thereby improving the display effect of the field sequential liquid crystal display.

[0125] In one or more embodiments, one pixel partition corresponds to at least one backlight partition.

[0126] Exemplarily, assuming that the field sequential backlight unit includes 4×6 backlight partitions, it can be set that 4 backlight partitions correspond to one pixel partition.

[0127] In an optional implementation, in any subfield sequence, the control unit 203 determines at least one pixel partition in the liquid crystal panel 201 according to the distribution of backlight partitions in the field sequence backlight unit corresponding to the subfield sequence.

[0128] Step S302: In a sub-field sequence corresponding to any sub-frame image, a target backlight control signal determination operation is performed:

[0129] The target backlight control signal control operation can be specifically implemented through steps S302-1 to S302-3:

[0130] S302-1, determining a target pixel value corresponding to a pixel partition according to a pixel value of a subframe image;

[0131] In an optional implementation, the control unit 203 is specifically configured to:

[0132] For any pixel partition in the pixel partition, perform the following operations:

[0133] Selecting at least one intermediate pixel value from the pixel values ​​of the subframe image, wherein the at least one intermediate pixel value is a pixel value corresponding to a pixel located in the pixel partition;

[0134] According to different pixel values, the intermediate pixel values ​​with the same value are counted to obtain the number of intermediate pixel values ​​of each value;

[0135] The middle pixel value corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition.

[0136] For example, it is assumed that the pixel value of a subframe image is:

[0137]

[0138] It is assumed that each pixel partition includes 3×3 pixels. Taking pixel partition 1 as an example, the pixel value corresponding to pixel partition 1 in the subframe image is: That is, the middle pixel value is

[0139]

[0140] Then, the above intermediate pixel values ​​are counted and it can be seen that: there is 1 pixel value of 95, 1 pixel value of 96, 2 pixel values ​​of 97, 2 pixel values ​​of 98, and 3 pixel values ​​of 99;

[0141] Finally, the middle pixel value corresponding to the value with the largest number is taken as the target pixel value. Since the middle pixel value corresponding to the value with the largest number among the aforementioned middle pixel values ​​is 99, the target pixel value corresponding to pixel partition 1 is 99.

[0142] In one or more embodiments, if the intermediate pixel values ​​corresponding to the largest number of values ​​include multiple intermediate pixel values, any one of the multiple intermediate pixel values ​​corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition.

[0143] Through the above method, the pixel values ​​corresponding to the pixels in each pixel partition are counted, and the pixel value corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition, so that within the actual flip response time determined according to the target pixel value, the number of liquid crystal molecules that complete the flip response in the pixel area is large, and the liquid crystal response is more sufficient, thereby improving the display effect of the liquid crystal display.

[0144] S302-2, determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence;

[0145] In an optional implementation, the control unit 203 is specifically configured to:

[0146] According to the pixel partition corresponding to the target pixel value, the target pixel value corresponding to the same pixel partition is selected from the target pixel values ​​of the previous sub-field sequence as the historical target pixel value;

[0147] The target pixel value and the historical target pixel value are mapped to obtain the actual flip response time of the liquid crystal molecules corresponding to the pixel partition.

[0148] In one or more embodiments, in a field sequence, the rotation order of multiple sub-field sequences is arbitrary.

[0149] It should be noted that, in the embodiment of the present invention, when displaying the frame image to be displayed, the rotation order of multiple subfield sequences can be: the subfield sequence corresponding to the red subframe image, the subfield sequence corresponding to the green subframe image, and the subfield sequence corresponding to the blue subframe image; it can also be: the subfield sequence corresponding to the blue subframe image, the subfield sequence corresponding to the red subframe image, and the subfield sequence corresponding to the green subframe image, or it can be other rotation orders, and the embodiment of the present invention does not impose any restrictions on this.

[0150] For example, assuming that in the current subfield sequence, the target pixel value corresponding to pixel partition 1 is: cur_pixel[1]=99, and the target pixel value corresponding to pixel partition 1 in the previous subfield sequence is used as the historical target pixel value, that is, the historical target pixel value is: pre_pixel[1]=128, then according to the target pixel value cur_pixel[1]=99 and the historical target pixel value pre_pixel[1]=128, the actual flip response time of the liquid crystal molecules corresponding to pixel partition 1 is calculated as: t1=f(pre_pixel[1], cur_pixel[1]), where f() is a mapping function.

[0151] In one or more embodiments, the change value between the target pixel value and the historical target pixel value is positively correlated with the actual flip response time of the liquid crystal molecules corresponding to the pixel partition.

[0152] For example, assuming that the target pixel value cur_pixel[1] corresponding to pixel partition 1 is 128, and the historical target pixel value pre_pixel[1] is 128, then the actual flip response time t1 of the liquid crystal molecules corresponding to pixel partition 1 is 0.2 ms;

[0153] Exemplarily, assuming that the target pixel value cur_pixel[2] corresponding to pixel partition 2 is 128, and the historical target pixel value pre_pixel[2] is 255, the actual flip response time t2 of the liquid crystal molecules corresponding to pixel partition 2 is 0.5 ms.

[0154] The actual flip response duration of the liquid crystal molecules is determined by the pixel values ​​corresponding to two adjacent subfield sequences, so that the flip response of the liquid crystal molecules is completed more fully within the actual flip response duration, thereby reducing the color separation phenomenon of the displayed image and improving the display effect of the liquid crystal display.

[0155] S302-3, determining a target backlight control signal for controlling a backlight partition corresponding to the pixel partition according to a preset data writing duration, an actual flip response duration, a preset backlight duration, and a subfield sequence period, wherein the subfield sequence period is determined according to a refresh frequency of the field sequential liquid crystal display 200;

[0156] In one or more embodiments, Figure 4 As shown, after the control unit 203 receives the image data corresponding to the multiple sub-frame images in the frame image to be displayed, for any sub-field sequence, within the sub-field sequence, the sub-frame image corresponding to the sub-field sequence is displayed in the following manner:

[0157] First, the control unit 203 writes the image data corresponding to the subframe image to the liquid crystal panel 201, wherein the time used to write the image data is the preset data writing time length;

[0158] After the image data is written, the liquid crystal molecules in the liquid crystal panel 201 begin to perform a flip response. When the liquid crystal molecules move to the position corresponding to the image data, the liquid crystal molecules complete the flip response. The time taken by the liquid crystal molecules to flip the response is the flip response duration.

[0159] After the liquid crystal molecules flip response ends, the control unit 203 controls the field sequence backlight unit 202 corresponding to the sub-field sequence to turn on the backlight through the backlight control signal, wherein the duration for which the field sequence backlight unit 202 turns on the backlight is the preset backlight duration, thereby realizing field sequence display.

[0160] It should be noted that the preset data writing time and the preset backlight time in the embodiment of the present invention are both empirical values ​​and can be flexibly set according to actual business needs. The embodiment of the present invention does not impose any restrictions on this. For example, the preset data writing time can be set to: t data =1ms, the preset backlight duration can be set to: t led =0.4ms.

[0161] In one or more embodiments, Figure 5 As shown, the data driving signal is used to control the writing of image data into the liquid crystal panel, that is, the effective duration corresponding to the data driving signal is the preset data writing duration t data The backlight control signal is used to control the field sequence backlight unit to turn on the backlight, that is, the effective duration corresponding to the backlight control signal is the preset backlight duration t led; Preset data writing time t data The end time and the preset backlight duration t led The time between the start time and the end time is the flip response time of the liquid crystal molecules t res ; The duration corresponding to a field sequence is T1, and the duration corresponding to a sub-field sequence is T2.

[0162] Optionally, the backlight control signal in the embodiment of the present invention may be a pulse width modulation (PWM) signal.

[0163] For example, if the refresh rate of the field sequential liquid crystal display 200 is: f=180 Hz, then the duration corresponding to each field sequence is: Correspondingly, the duration corresponding to each sub-field sequence, that is, the sub-field sequence period is:

[0164] In an optional embodiment, if Figure 6 As shown, the control unit 203 determines the target backlight control signal through the following steps:

[0165] Step S601, determining the actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration;

[0166] In an optional implementation manner, if one backlight partition corresponds to one pixel partition, the control unit is specifically configured to:

[0167] The actual flip response duration is used as the target flip response duration;

[0168] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual subfield sequence duration.

[0169] In a specific implementation, when one backlight partition corresponds to one pixel partition, the actual flip response time corresponding to the pixel partition is used as the target flip response time for determining the target backlight signal.

[0170] In an optional implementation manner, if one backlight partition corresponds to multiple pixel partitions, the control unit 203 is specifically configured to:

[0171] Taking the maximum value among the multiple actual flip response time lengths as the target flip response time length, wherein the multiple pixel partitions corresponding to the multiple actual flip response time lengths correspond to the same backlight partition;

[0172] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual subfield sequence duration.

[0173] In a specific implementation, when one backlight partition corresponds to multiple pixel partitions, one actual flip response time length is arbitrarily selected from the actual flip response time lengths corresponding to the multiple pixel partitions as the target flip response time length for determining the target backlight signal.

[0174] In an optional implementation, the control unit 203 uses the end time of the preset data writing duration as the start time of the target response flip duration, and uses the end time of the target response flip duration as the start time of the effective duration of the target backlight control signal.

[0175] Figure 7 A waveform diagram of a data driving signal and a target backlight control signal is shown. Figure 7 As shown, the duration corresponding to a certain field sequence is T1, and the field sequence includes 3 subfield sequences, namely the first subfield sequence, the second subfield sequence and the third subfield sequence, wherein the first actual subfield sequence duration corresponding to the first subfield sequence is T31, and the first target response flip duration is tres1; the second actual subfield sequence duration corresponding to the second subfield sequence is T32, and the second target response flip duration is tres2; the third actual subfield sequence duration corresponding to the third subfield sequence is T33, and the third target response flip duration is tres3; in each subfield sequence, the preset data write duration is tdata, and the preset backlight duration is tled;

[0176] like Figure 7 As shown, in the first sub-field sequence, when the end time of the preset data writing duration tdata is reached, the first target response flip duration tres1 is entered, and within tres1, the liquid crystal molecules perform a flip response; when the end time of the first target response flip duration tres1 is reached, the backlight control signal is valid, and the field sequence backlight unit is controlled to turn on the backlight; when the end time of the preset backlight duration tled1 is reached, the next sub-field sequence is immediately turned on without waiting for the end time of the sub-field sequence period T2.

[0177] like Figure 7 As shown in FIG. 1 , in the first subfield sequence, the first target response flipping time tres1 is significantly shorter, so that the backlight turn-on time of the first subfield sequence is earlier. Therefore, the first actual subfield sequence time T31 is shorter than the subfield sequence period T2, which reserves enough response time for the second subfield sequence. Figure 7 It can be seen that the time required for the liquid crystal flip response in the second subfield sequence is longer, that is, the second target response flip duration tres2 is longer. Since the first subfield sequence ends earlier, sufficient time is reserved for the second subfield sequence. Therefore, in the second subfield sequence, the liquid crystal molecules can achieve sufficient flip response, thereby improving the display effect of the field sequential liquid crystal display.

[0178] For example, assuming that the preset data writing time tdata =1ms, preset backlight duration t led =0.4ms, target flip response time t res =0.6ms, then the actual sub-field sequence duration is: T 3 =t data +t res +t led =1ms+0.6ms+0.4ms=2ms.

[0179] By taking the end time of the actual subfield sequence duration of the current subfield sequence as the start time of the next subfield sequence, if the response speed of the liquid crystal molecules in the current subfield sequence is faster, the duration of the current subfield sequence can be shortened, reserving more liquid crystal response time for subsequent subfield sequences; if the response speed of the liquid crystal molecules in the current subfield sequence is slower, it can ensure that the liquid crystal molecules fully respond, thereby improving the display effect of the field sequential liquid crystal display.

[0180] Step S602, comparing the actual subfield sequence duration with the subfield sequence period;

[0181] Step S603 , adjusting the reference backlight control signal according to the comparison result, the actual flip response time and the preset data writing time to obtain a target backlight control signal.

[0182] In an optional implementation, the control unit 203 is specifically configured to:

[0183] If the comparison result is that the actual sub-field sequence duration is less than the sub-field sequence period, then the relevant parameters of the reference backlight control signal are kept unchanged to obtain the target backlight control signal;

[0184] If the comparison result is that the actual subfield sequence duration is not less than the subfield sequence period, the position of the subfield sequence in the frame image to be displayed is determined, and the reference backlight control signal is adjusted according to the determination result to obtain the target backlight control signal.

[0185] In an optional implementation manner, if the actual sub-field sequence duration is not less than the sub-field sequence period, the control unit 203 is specifically configured to:

[0186] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, then the relevant parameters of the reference backlight control signal are kept unchanged to obtain the target backlight control signal;

[0187] If the subfield sequence is the last subfield sequence in the frame image to be displayed, then increase the relevant parameters of the reference backlight control signal to obtain the target backlight control signal;

[0188] The relevant parameters include duty cycle and / or amplitude value.

[0189] Figure 8A waveform diagram of a data driving signal and a backlight control signal is shown. Figure 8 It can be seen that the first target response flipping time tres1 in the first subfield sequence and the second target response flipping time tres2 in the second subfield sequence are both relatively long, which greatly shortens the time of the third subfield sequence, and further makes the time between the moment when the backlight is turned on and the moment when the field sequence ends after the third subfield sequence completes the flipping response of the liquid crystal molecules less than the preset backlight time tled. In order to ensure that the backlight brightness is not affected, the backlight in the third subfield sequence can be controlled to reach the target brightness in a shorter time by increasing the relevant parameters of the reference backlight control signal, thereby ensuring that the display effect of the field sequential liquid crystal display is not affected.

[0190] In one or more embodiments, if the subfield sequence is the last subfield sequence in the frame image to be displayed, the amplitude value of the reference backlight control signal is increased to obtain the target backlight control signal.

[0191] like Figure 8 As shown, the amplitude values ​​of the target backlight control signal in the first subfield sequence and the second subfield sequence are both A1, and the amplitude value of the target backlight control signal in the third subfield sequence is set to A2, and A2>A1.

[0192] In one or more embodiments, if the subfield sequence is the last subfield sequence in the frame image to be displayed, the duty cycle of the reference backlight control signal is increased to obtain the target backlight control signal

[0193] like Fig. 9 As shown, in the first subfield sequence and the second subfield sequence, the duty cycle of the target backlight control signal in the effective duration is 50%, and the duty cycle of the target backlight control signal in the third subfield sequence in the effective duration is set to 80%.

[0194] In one or more embodiments, if the subfield sequence is the last subfield sequence in the frame image to be displayed, the duty cycle and amplitude value of the reference backlight control signal are increased to obtain the target backlight control signal

[0195] For example, assuming that the sub-field sequence period T 2 =1.85ms, actual sub-field sequence length T 3 =1.5ms, due to T 3 =1.5ms<T 2 =1.85ms, then the duty cycle and amplitude value of the reference backlight control signal are kept unchanged, and only the starting time of the effective duration of the reference backlight control signal is adjusted to the end time of the target response flip duration, and the obtained backlight control signal is the target backlight control signal.

[0196] For example, assuming that the sub-field sequence period T 2=1.85ms, the actual subfield sequence duration T corresponding to the first subfield sequence 31 =2ms, due to T 31 =2ms>T 2 =1.85ms, then the duty cycle and amplitude value of the reference backlight control signal are kept unchanged, and only the starting time of the effective duration of the reference backlight control signal is adjusted to the end time of the first target response flip duration tres1, and the obtained backlight control signal is the target backlight control signal.

[0197] For example, assuming that the sub-field sequence period T 2 =1.85ms, the actual subfield sequence duration corresponding to the third subfield sequence is T 33 =2ms, due to T 33 =2ms>T 2 =1.85ms, then the amplitude value of the reference backlight control signal is increased from A1 to A2, and the starting time of the effective duration of the reference backlight control signal is adjusted to the end time of the third target response flip duration tres3, and the obtained backlight control signal is the target backlight control signal.

[0198] In an optional implementation, the control unit 203 is further configured to:

[0199] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, the end time of the actual subfield sequence duration is used as the start time of the next subfield sequence;

[0200] If the subfield sequence is the last subfield sequence in the frame image to be displayed, the end time of the subfield sequence period is used as the start time of the next subfield sequence.

[0201] In the above-mentioned display, after data writing is completed, the liquid crystal molecules begin to flip in response, and when the target flip response time is reached, the field sequential backlight unit is immediately controlled to turn on the backlight, thereby ensuring that the liquid crystal molecules fully respond while reserving sufficient time for the subsequent sub-field sequence, so that the display effect of the field sequential liquid crystal display is improved.

[0202] A field sequential backlight unit 202, used to turn on the backlight under the control of a target backlight control signal;

[0203] The liquid crystal panel 201 is used to display a frame image to be displayed after the field sequential backlight unit 202 turns on the backlight.

[0204] In the field sequential liquid crystal display provided by the embodiment of the present invention, the control unit calculates the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value corresponding to the pixel partition in the current subfield sequence and the target pixel value in the previous subfield sequence, and determines the target backlight control signal for controlling the field sequence backlight unit to turn on the backlight according to the subfield sequence period, the preset data writing time, the aforementioned actual flip response time and the preset backlight time. Since the actual flip response time is determined according to the pixel value, when the target backlight control signal controls the field sequence backlight unit to turn on the backlight, the number of liquid crystal molecules that complete the flip response in the liquid crystal panel increases, which effectively reduces the color separation phenomenon of the liquid crystal panel when displaying the frame image to be displayed, thereby improving the display effect of the field sequential liquid crystal display.

[0205] Fig.10 A schematic diagram of a complete working process of a field sequential liquid crystal display provided by an embodiment of the present invention is shown, comprising the following steps:

[0206] Step S1001, the control unit 203 determines pixel partitions corresponding to the backlight partitions in the liquid crystal panel 201 according to the distribution of the backlight partitions in the field sequential backlight unit 202;

[0207] Step S1002, the control unit 203 receives image data corresponding to a plurality of sub-frame images in a frame image to be displayed;

[0208] The image data includes pixel values.

[0209] Step S1003, in the current sub-field sequence, the control unit 203 selects pixel values ​​located in the same pixel partition from the pixel values ​​of the sub-frame image as intermediate pixel values;

[0210] Step S1004, the control unit 203 counts the intermediate pixel values ​​having the same value, and uses the intermediate pixel value corresponding to the value with the largest number as the target pixel value corresponding to the pixel partition;

[0211] Step S1005, the control unit 203 performs mapping processing on the target pixel value and the historical target pixel value to obtain the actual flip response time of the liquid crystal molecules corresponding to the pixel partition;

[0212] The historical target pixel value is the target pixel value of the previous sub-field sequence, and the pixel partition corresponding to the historical target pixel value and the pixel partition corresponding to the target pixel value are the same pixel partition.

[0213] Step S1006, the control unit 203 uses the actual flip response duration as the target flip response duration, and uses the sum of the preset data writing duration, the target flip response duration and the preset backlight duration as the actual subfield sequence duration;

[0214] Step S1007, the control unit 203 uses the end time of the preset data writing duration as the start time of the target response flipping duration, and uses the end time of the target response flipping duration as the start time of the effective duration of the target backlight control signal;

[0215] Step S1008, the control unit 203 determines whether the actual sub-field sequence duration is less than the sub-field sequence period, if so, executes step S1009, otherwise, executes step S1010;

[0216] Step S1009, the control unit 203 keeps the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal;

[0217] Step S1010, the control unit 203 determines whether the current subfield sequence is the last subfield sequence in the frame image to be displayed, if so, execute step S1011, otherwise, execute step S1012;

[0218] Step S1011, the control unit 203 increases the relevant parameters of the reference backlight control signal to obtain a target backlight control signal;

[0219] Step S1012, the control unit 203 keeps the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal;

[0220] Step S1013, the control unit 203 transmits the target backlight control signal to the field sequential backlight unit 202;

[0221] Step S1014, the field sequential backlight unit 202 turns on the backlight under the control of the target backlight control signal;

[0222] Step S1015 : the liquid crystal panel 201 displays the frame image to be displayed.

[0223] Based on the same concept, an embodiment of the present invention further provides a backlight control method for a field sequential liquid crystal display, which is applied to a field sequential liquid crystal display provided in any of the above embodiments. Since the method is the method executed by the field sequential liquid crystal display in the embodiment of the present invention, and the principle of solving the problem by the method is similar to that of the display, the implementation of the method can refer to the implementation of the display, and the repeated parts will not be repeated.

[0224] The above method comprises the following steps:

[0225] Determining pixel partitions in a liquid crystal panel based on distribution of backlight partitions in a plurality of field sequential backlight units, wherein the plurality of field sequential backlight units correspond to a plurality of sub-frame images in a frame image to be displayed;

[0226] In the subfield sequence corresponding to any subframe image, the following operations are performed:

[0227] Determine a target pixel value corresponding to the pixel partition according to the pixel value of the subframe image;

[0228] Determine the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence;

[0229] Determine a target backlight control signal for controlling a backlight partition corresponding to a pixel partition according to a preset data writing duration, an actual flip response duration, a preset backlight duration, and a subfield sequence period, so that the liquid crystal panel displays a frame image to be displayed after the field sequence backlight unit turns on the backlight;

[0230] The sub-field sequence period is determined according to the refresh frequency of the field sequential liquid crystal display.

[0231] In an optional implementation, determining a target pixel value corresponding to a pixel partition according to a pixel value of a subframe image includes:

[0232] For any pixel partition in the pixel partition, perform the following operations:

[0233] Selecting at least one intermediate pixel value from the pixel values ​​of the subframe image, wherein the at least one intermediate pixel value is a pixel value corresponding to a pixel located in the pixel partition;

[0234] According to different pixel values, the intermediate pixel values ​​with the same value are counted to obtain the number of intermediate pixel values ​​of each value;

[0235] The middle pixel value corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition.

[0236] In an optional implementation, determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence includes:

[0237] According to the pixel partition corresponding to the target pixel value, the target pixel value corresponding to the same pixel partition is selected from the target pixel values ​​of the previous sub-field sequence as the historical target pixel value;

[0238] The target pixel value and the historical target pixel value are mapped to obtain the actual flip response time of the liquid crystal molecules corresponding to the pixel partition.

[0239] In an optional implementation, determining a target backlight control signal for controlling a backlight partition corresponding to a pixel partition according to a preset data writing duration, an actual flip response duration, a preset backlight duration, and a subfield sequence period includes:

[0240] Determine the actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration, and compare the actual subfield sequence duration with the subfield sequence period;

[0241] According to the comparison result, and based on the actual flip response time and the preset data writing time, the reference backlight control signal is adjusted to obtain the target backlight control signal.

[0242] In an optional implementation, if one backlight partition corresponds to one pixel partition, the actual subfield sequence duration is determined according to the preset data writing duration, the actual flip response duration and the preset backlight duration, including:

[0243] The actual flip response duration is used as the target flip response duration;

[0244] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual subfield sequence duration.

[0245] In an optional implementation, if one backlight partition corresponds to multiple pixel partitions, the actual subfield sequence duration is determined according to the preset data writing duration, the actual flip response duration and the preset backlight duration, including:

[0246] Taking the maximum value among the multiple actual flip response time lengths as the target flip response time length, wherein the multiple pixel partitions corresponding to the multiple actual flip response time lengths correspond to the same backlight partition;

[0247] The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual subfield sequence duration.

[0248] In an optional implementation, according to the comparison result and based on the actual flip response duration and the preset data writing duration, the reference backlight control signal is adjusted to obtain the target backlight control signal, including:

[0249] The end time of the preset data writing duration is used as the start time of the target response flipping duration, and the end time of the target response flipping duration is used as the start time of the effective duration of the target backlight control signal;

[0250] If the comparison result is that the actual sub-field sequence duration is less than the sub-field sequence period, then the relevant parameters of the reference backlight control signal are kept unchanged to obtain the target backlight control signal;

[0251] If the comparison result is that the actual subfield sequence duration is not less than the subfield sequence period, the position of the subfield sequence in the frame image to be displayed is determined, and the reference backlight control signal is adjusted according to the determination result to obtain the target backlight control signal.

[0252] In an optional implementation, determining the position of the subfield sequence in the frame image to be displayed, and adjusting the reference backlight control signal according to the determination result to obtain the target backlight control signal includes:

[0253] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, then the relevant parameters of the reference backlight control signal are kept unchanged to obtain the target backlight control signal;

[0254] If the subfield sequence is the last subfield sequence in the frame image to be displayed, then increase the relevant parameters of the reference backlight control signal to obtain the target backlight control signal;

[0255] The relevant parameters include duty cycle and / or amplitude value.

[0256] In an optional embodiment, the method further includes:

[0257] If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, the end time of the actual subfield sequence duration is used as the start time of the next subfield sequence;

[0258] If the subfield sequence is the last subfield sequence in the frame image to be displayed, the end time of the subfield sequence period is used as the start time of the next subfield sequence.

[0259] Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A field sequential liquid crystal display, characterized in that: The invention comprises a liquid crystal panel, a plurality of field sequential backlight units and a control unit, wherein: The control unit is used to perform the following operations: Determining pixel partitions in the liquid crystal panel based on backlight partitions in the plurality of field sequential backlight units, wherein the plurality of field sequential backlight units correspond to a plurality of sub-frame images in a frame image to be displayed; In the subfield sequence corresponding to any subframe image, the following operations are performed: Determining a target pixel value corresponding to the pixel partition according to the pixel value of the subframe image; Determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence; Determine a target backlight control signal for controlling a backlight partition corresponding to the pixel partition according to a preset data writing duration, the actual flip response duration, a preset backlight duration, and a subfield sequence period, wherein the subfield sequence period is determined according to a refresh frequency of the field sequential liquid crystal display; The field sequential backlight unit is used to turn on the backlight under the control of the target backlight control signal; The liquid crystal panel is used to display the frame image to be displayed after the field sequential backlight unit turns on the backlight.

2. The display according to claim 1, characterized in that The control unit is specifically used for: For any one of the pixel partitions, perform the following operations: Selecting at least one intermediate pixel value from the pixel values ​​of the subframe image, wherein the at least one intermediate pixel value is a pixel value corresponding to a pixel located in the pixel partition; According to different pixel values, the intermediate pixel values ​​with the same value are counted to obtain the number of intermediate pixel values ​​of each value; The middle pixel value corresponding to the largest number of values ​​is used as the target pixel value corresponding to the pixel partition.

3. The display according to claim 1, wherein: The control unit is specifically used for: According to the pixel partition corresponding to the target pixel value, a target pixel value corresponding to the same pixel partition is selected from the target pixel values ​​of the previous sub-field sequence as the historical target pixel value; The target pixel value and the historical target pixel value are mapped to obtain the actual flip response time of the liquid crystal molecules corresponding to the pixel partition.

4. The display according to claim 1, wherein: The control unit is specifically used for: Determine an actual subfield sequence duration according to the preset data writing duration, the actual flip response duration and the preset backlight duration, and compare the actual subfield sequence duration with the subfield sequence period; According to the comparison result and based on the actual flip response time and the preset data writing time, the reference backlight control signal is adjusted to obtain the target backlight control signal.

5. The display according to claim 4, characterized in that If one backlight partition corresponds to one pixel partition, the control unit is specifically used for: Using the actual flip response duration as the target flip response duration; The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual sub-field sequence duration.

6. The display according to claim 4, characterized in that If one backlight partition corresponds to multiple pixel partitions, the control unit is specifically used for: Taking the maximum value among a plurality of actual flip response time lengths as the target flip response time length, wherein the plurality of pixel partitions corresponding to the plurality of actual flip response time lengths correspond to the same backlight partition; The sum of the preset data writing duration, the target flip response duration and the preset backlight duration is used as the actual sub-field sequence duration.

7. The display according to claim 5 or 6, characterized in that: The control unit is specifically used for: Using the end time of the preset data writing duration as the start time of the target response flipping duration, and using the end time of the target response flipping duration as the start time of the effective duration of the target backlight control signal; If the comparison result is that the actual subfield sequence duration is less than the subfield sequence period, then keeping the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal; If the comparison result is that the actual subfield sequence duration is not less than the subfield sequence period, the position of the subfield sequence in the frame image to be displayed is determined, and the reference backlight control signal is adjusted according to the determination result to obtain the target backlight control signal.

8. The display according to claim 7, characterized in that The control unit is specifically used for: If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, then keeping the relevant parameters of the reference backlight control signal unchanged to obtain the target backlight control signal; If the subfield sequence is the last subfield sequence in the frame image to be displayed, then increasing the relevant parameters of the reference backlight control signal to obtain the target backlight control signal; The relevant parameters include duty cycle and / or amplitude value.

9. The display according to claim 8, characterized in that The control unit is also used for: If the subfield sequence is a subfield sequence other than the last subfield sequence in the frame image to be displayed, the end time of the actual subfield sequence duration is used as the start time of the next subfield sequence; If the subfield sequence is the last subfield sequence in the frame image to be displayed, the end time of the subfield sequence period is used as the start time of the next subfield sequence.

10. A backlight control method for a field sequential liquid crystal display, characterized in that: Applied to a field sequential liquid crystal display as claimed in any one of claims 1 to 9, the method comprising: Determining pixel partitions in a liquid crystal panel based on distribution of backlight partitions in a plurality of field sequential backlight units, wherein the plurality of field sequential backlight units correspond to a plurality of sub-frame images in a frame image to be displayed; In the subfield sequence corresponding to any subframe image, the following operations are performed: Determining a target pixel value corresponding to the pixel partition according to the pixel value of the subframe image; Determining the actual flip response time of the liquid crystal molecules corresponding to the pixel partition according to the target pixel value and the target pixel value in the previous subfield sequence; Determine, according to a preset data writing duration, the actual flip response duration, a preset backlight duration and a subfield sequence period, a target backlight control signal for controlling a backlight partition corresponding to the pixel partition, so that the liquid crystal panel displays the frame image to be displayed after the field sequence backlight unit turns on the backlight; Wherein, the sub-field sequence period is determined according to the refresh frequency of the field sequential liquid crystal display.

Images