Display module and display device

Abstract

The application relates to a display module and a display device. The display module is used for executing picture display, and comprises a display panel and a backlight module. The backlight module comprises a backlight driving circuit, and the display module further comprises a conversion control unit. The conversion control unit receives a display signal and converts the display signal to generate a control signal. The backlight control signal is generated according to the control signal and pre-stored brightness compensation data and is output to the backlight driving circuit. The backlight driving circuit receives the backlight control signal and sequentially provides backlight with corresponding compensation brightness to adapt to the pause time of different refresh rates for the current frame display of the display panel according to the backlight control signal until the next frame of the backlight control signal is received. In the display module of the application, the backlight brightness of the display time and the pause time is controlled respectively, the backlight brightness is compensated according to the length of the pause time of different refresh rates, and the light and dark changes of the display panel due to different leakage degrees during the refresh rate switching are eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display module and a display device comprising the same. BACKGROUND

[0002] A frame of a display panel is usually divided into a display time (Active area) and a pause time (Blank area) before entering the next frame. In the display variable frequency technology (Freesync), the refresh rate is changed by changing the number of time rows of the pause time (Blank area) of a frame of the display panel.

[0003] However, the lower the refresh rate, the longer the pause time of the Blank area of a frame of the display panel. When the display panel switches between different refresh rates, the leakage phenomenon of the capacitance maintaining the pressure difference between the two sides of the liquid crystal is different due to the different refresh rates, thereby causing the display panel to have different degrees of brightness change, affecting the display effect. In particular, when the higher refresh rate and the lower refresh rate are switched, the corresponding frame time difference is large, for example, when 240Hz is switched to 48Hz, the frame time difference of the higher refresh rate and the lower refresh rate is 5 times, and the brightness change of the display panel is more obvious, which seriously affects the display effect.

[0004] Therefore, how to avoid different degrees of brightness change when the display panel switches between different refresh rates is a problem to be solved by those skilled in the art. SUMMARY

[0005] In view of the shortcomings of the prior art, the purpose of the present application is to provide a display module and a display device, which respectively control the brightness of the display time and the pause time, compensate the brightness of the backlight according to the length of the pause time of different refresh rates, and eliminate the brightness change of the display panel due to different leakage degrees when the refresh rate is switched.

[0006] In a first aspect, the present application provides a display module for executing picture display. The display module comprises a display panel and a backlight module, the backlight module comprises a backlight driving circuit, and the display module further comprises a conversion control unit electrically connected with the display panel and the backlight driving circuit of the backlight module; the conversion control unit receives a display signal, converts the display signal to generate a control signal, generates a corresponding backlight control signal according to the control signal and pre-stored brightness compensation data, and outputs the backlight control signal to the backlight driving circuit; the backlight driving circuit receives the backlight control signal, and provides a backlight with a corresponding compensation brightness in a corresponding compensation time for the current frame display of the display panel according to the backlight control signal to adapt to the pause time of different refresh rates, until the next frame of the backlight control signal is received.

[0007] In some embodiments, the display brightness of the current frame of the display panel is equal to an equivalent mean brightness of the display brightness of the display time and the display brightness of the pause time.

[0008] In some embodiments, the conversion control unit comprises a data processing circuit and a timing control circuit, the timing control circuit is electrically connected with the data processing circuit, the display panel and the backlight driving circuit, the data processing circuit receives the display signal, converts the display signal to generate the control signal, and transmits the generated control signal to the timing control circuit; the timing control circuit generates the backlight control signal according to the brightness compensation data and the control signal, and outputs the backlight control signal to the backlight driving circuit.

[0009] In some embodiments, the display panel changes the display from a first refresh rate, a second refresh rate to an Nth refresh rate, and the first refresh rate, the second refresh rate to the Nth refresh rate decrease in turn; the first refresh rate, the second refresh rate to the Nth refresh rate are all started from the same time, the start time to the end time of the pause time of the first refresh rate is the first display brightness and the first compensation time, the end time of the pause time of the first refresh rate to the end time of the pause time of the second refresh rate is the second display brightness and the second compensation time, the end time of the pause time of the N-1th refresh rate to the end time of the pause time of the Nth refresh rate corresponds to the Nth display brightness and the Nth compensation time, wherein N is a positive integer greater than 2; the brightness compensation data comprises the first display brightness, the second display brightness to the Nth display brightness stored in turn, and the first compensation time, the second compensation time to the Nth compensation time corresponding thereto; the timing control circuit outputs the backlight control signal to the backlight driving circuit according to the control signal and the brightness compensation data, the backlight control signal controls the backlight module to provide the backlight with the first compensation brightness, the second compensation brightness to the Nth compensation brightness to the display panel in turn according to the first compensation time, the second compensation time to the Nth compensation time, wherein the first compensation brightness is equal to the first display brightness multiplied by a preset backlight compensation multiple, the second compensation brightness is equal to the second display brightness multiplied by the preset backlight compensation multiple, and the Nth compensation brightness is equal to the Nth display brightness multiplied by the preset backlight compensation multiple.

[0010] In some embodiments, the preset backlight compensation multiple is equal to the reciprocal of the light transmittance of the display panel.

[0011] In some embodiments, the backlight brightness at the beginning of the mth compensation time in the Nth compensation time is a first brightness, the backlight brightness at the end of the mth compensation time is a second brightness, and the first brightness is less than the second brightness, the backlight driving circuit controls the backlight brightness to increase from the first brightness to the second brightness in the mth compensation time according to the backlight control signal, and the average brightness in the mth compensation time is equal to the mth compensation brightness, where m is a positive integer greater than or equal to 1 and less than or equal to N.

[0012] In some embodiments, the backlight brightness at the beginning of the mth compensation time in the Nth compensation time is a first brightness, the backlight brightness at the end of the mth compensation time is a second brightness, and the first brightness is less than the second brightness, the backlight driving circuit controls the backlight brightness to increase from the first brightness to the second brightness in the mth compensation time according to the backlight control signal, and the average brightness in the mth compensation time is equal to the mth compensation brightness, where m is a positive integer greater than or equal to 1 and less than or equal to N.

[0013] In some embodiments, the display panel includes a display driving unit, the timing control circuit is electrically connected to the display driving unit, and outputs a display control signal to the display driving unit according to the control signal, the display control signal containing information for controlling the deflection of liquid crystal molecules of the display panel.

[0014] In some embodiments, the display driving unit includes a power management circuit, a timing circuit, a gamma circuit, and a driving circuit, the power management circuit is electrically connected to the timing control circuit, the timing circuit, the gamma circuit, and the driving circuit, the power management circuit receives the display control signal from the timing control circuit and allocates power supply to the timing circuit, the gamma circuit, and the driving circuit according to the display control signal, and the timing control circuit is further configured to transmit the display control signal to the timing circuit; the timing circuit is further electrically connected to the timing control circuit, the gamma circuit, and the driving circuit, the timing circuit receives the display control signal from the timing control circuit and controls the signal transmission timing of the gamma circuit and the driving circuit according to the timing information contained in the display control signal; the gamma circuit is further electrically connected to the driving circuit, the gamma circuit receives the display control signal from the power management circuit, converts the data signal in the display control signal into an analog signal, and transmits the analog signal to the driving circuit; and the driving circuit drives the display panel to perform picture display according to the received analog signal.

[0015] In a second aspect, the present application further provides a display device, comprising a display signal unit and the display module as described above, wherein the display signal unit provides display signals for the display module to perform picture display.

[0016] In summary, in the display module and the display device of the present application, the leakage of the display panel is linearly changed in the pause time, and the backlight brightness in the display time and the pause time is separately controlled. Meanwhile, when displaying the same picture, the leakage of the pause time of the second refresh rate in the period of T2 to T3 is consistent with the leakage of the pause time of the first refresh rate in the period of T2 to T3, the backlight brightness of the compensation time of a frame of the display panel is controlled in sections according to the different lengths of the pause time of different refresh rates, the obvious light and dark changes caused by the different leakage degrees when switching between different refresh rates are reduced or even eliminated, that is, the problem of obvious decrease in display brightness caused by the leakage of the display panel can be compensated in real time. Further, the problem of obvious light and dark changes of the display panel caused by the delay in adjusting the backlight brightness as a whole according to the backlight brightness information contained in the frame display signal when receiving the frame display signal is avoided, the backlight brightness is adjusted without delay in the present application, and thus the display effect of the display device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 FIG. 1 is a structural schematic diagram of a display panel in the prior art;

[0019] Figure 2 FIG. 2 is a pixel architecture schematic diagram of the display panel shown in FIG. 1; Figure 1

[0020] Figure 3 FIG. 3 is a control principle schematic diagram of the pixel architecture shown in FIG. 2; Figure 2

[0021] Figure 4 FIG. 4 is a relationship curve diagram between the refresh rate and the display brightness of the display panel shown in FIG. 2; Figure 1

[0022] Figure 5 FIG. 5 is a comparison schematic diagram of the composition of a frame length under different refresh rates of the display panel shown in FIG. 2; Figure 1

[0023] Figure 6 ​​​​A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2.

[0024] Figure 7 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2. Figure 6 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2.

[0025] Figure 8 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2. Figure 6 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2.

[0026] Figure 9 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2. Figure 7 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2.

[0027] Figure 10 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2. Figure 6 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2.

[0028] Figure 11 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2. Figure 6 A circuit structure schematic diagram of a display module of the display device shown in FIG. 1 is shown in FIG. 2.

[0029] Legend of reference signs:

[0030] 10, 20 - display panel; 25 - display driving unit; 42 - power management circuit; 43 - timing circuit; 44 - gamma circuit; 46 - driving circuit; 200 - display module; 1000 - display device; 300 - display signal unit; 30 - backlight module; 35 - backlight driving circuit; 60 - conversion control unit; 62 - data processing circuit; 63 - timing control circuit; 2 - color film common electrode layer; 3 - pixel electrode layer; 4 - pixel common electrode layer; 5 - insulating channel; 6 - liquid crystal layer channel; 7 - data line; 8 - driving circuit channel; 10a - first color pixel unit; 10b - second color pixel unit; 10c - third color pixel unit; F1 - first direction; F2 - second direction; data - data signal; Scan - scanning signal; C - storage unit; M - control unit; c1 - first capacitor; c2 - second capacitor; vcom - common display signal; Avcom - compensation display signal; m1, m2, m3, m4 - time length of one frame; a - display time; b, c, d, e - pause time. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] The following description of the embodiments is provided as an example to illustrate the present application which can be implemented in various ways. The numbers of components described herein, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequential or technical meaning. Unless otherwise specified, the terms "connected" and "coupled" in the present application include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only the directions of the attached drawings, and therefore, the directional terms used are for better, clearer illustration and understanding of the present application, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, cannot be understood as limiting the present application.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connected", "coupled" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include", "may include", "contain" or "may contain" used in the present application represent the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit other one or more functions, operations, elements, etc. In addition, the terms "include" or "contain" represent the existence of the corresponding features, numbers, steps, operations, elements, components or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components or combinations thereof, and are intended to cover non-exclusive inclusion. It should also be understood that the meaning of "at least one" described herein is one and more, for example, one, two or three, etc., and the meaning of "multiple" is at least two, for example, two or three, etc., unless otherwise explicitly specified. The terms "step 1", "step 2", etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a specific order.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0035] Please refer to Figure 1, Figure 1 FIG. 1 is a schematic view of a display panel 10 in the prior art. As shown in FIG. 1, the display panel 10 includes a color filter substrate (not shown) and an array substrate arranged oppositely, and a liquid crystal layer (not shown) between the color filter substrate and the array substrate. The array substrate includes a pixel electrode layer 3 and a pixel common electrode layer 4, wherein the pixel electrode layer 3 and the pixel common electrode layer 4 are arranged oppositely, and an insulating layer (not shown) is arranged between the pixel electrode layer 3 and the pixel common electrode layer 4. The color filter substrate includes a color filter common electrode layer 2, which is arranged oppositely to the pixel electrode layer 3, and the liquid crystal layer is between the color filter common electrode layer 2 and the pixel electrode layer 3. Figure 1

[0036] In particular, the display panel 10 has an insulating channel 5, a liquid crystal layer channel 6 and a driving circuit channel 8. The insulating channel 5 penetrates the insulating layer and extends to the liquid crystal layer and the pixel common electrode layer 4. The liquid crystal layer channel 6 penetrates the liquid crystal layer and extends to the color filter common electrode layer 2. The driving circuit channel 8 is connected to the data line 7 and the pixel electrode layer 3. The driving circuit is electrically connected to the data line 7 and the pixel electrode layer 3, and is used to control the voltage value of the pixel electrode layer 3. That is, the data signal is transmitted to the pixel electrode layer 3 through the data line 7 and the driving circuit to control the voltage value of the pixel electrode layer 3. By controlling the voltage value of the color filter common electrode layer 2 and the pixel electrode layer 3, the liquid crystal molecules in the liquid crystal layer are powered to different degrees of deflection. However, the impurities in the liquid crystal layer will cause leakage. That is, the impurities in the liquid crystal layer will leak along the liquid crystal layer channel 6 to the color filter common electrode layer 2 as shown in FIG. 2. In addition, due to the relative insulation effect of the insulating layer, the impurities in the liquid crystal layer will leak to the pixel common electrode layer 4 through the insulating channel 5. Figure 1

[0037] Correspondingly, the display panel 10 controls the voltage value of the pixel electrode layer 3 through the driving circuit. After the driving circuit is charged, leakage will also occur. The driving circuit leaks along the driving circuit channel 8 to the data line 7.

[0038] Please refer to Figure 2 , Figure 2 is Figure 1 ​​A pixel architecture of the display panel 10 is shown. The display panel 10 includes a plurality of pixel units arranged in an array, and each column of pixel units is electrically connected to the data line 7. Specifically, the plurality of pixel units can include a plurality of first color pixel units 10a, a plurality of second color pixel units 10b, and a plurality of third color pixel units 10c, wherein the first color pixel units 10a, the second color pixel units 10b, and the third color pixel units 10c in the same row are arranged in turn and are spaced apart, and the pixel units in the same column are the first color pixel units 10a, the second color pixel units 10b, or the third color pixel units 10c. The display panel 10 can be driven by a bipolar voltage, i.e., two adjacent pixel units in each column are driven by voltages of different polarities, and each column of two adjacent pixel units can be electrically connected to the data line 7 for transmitting two data signals of opposite polarities. For example, Figure 2 The first pixel unit in the first column is driven by a positive data signal, and the second pixel unit in the first column is driven by a negative data signal.

[0039] Referring to Figure 3 , Figure 3 for Figure 2 A control principle diagram of the pixel architecture is shown. As shown in Figure 3 , the display panel 10 is internally arranged in a grid shape with a plurality of scan lines extending along a first direction F1 and a plurality of data lines extending along a second direction F2. The first direction F1 and the second direction F2 are perpendicular to each other, and the plurality of scan lines, the plurality of data lines, and the scan lines and the data lines are insulated from each other. That is, the plurality of scan lines are arranged in a spaced apart manner and are insulated from each other, the plurality of data lines are arranged in a spaced apart manner and are insulated from each other, and the plurality of scan lines and the plurality of data lines are arranged in a spaced apart manner and are insulated from each other.

[0040] As shown in Figure 3 , the intersection of the plurality of scan lines and the plurality of data lines is provided with a pixel unit. Specifically, the pixel unit is arranged between any two adjacent scan lines and any two adjacent data lines, the pixel units in the same row are electrically connected to the same scan line, and the adjacent two pixel units in the same column are electrically connected to the data lines corresponding to the data signals data of opposite polarities.

[0041] Each of the pixel units comprises a driving element and a liquid crystal layer (not shown in the figure). The liquid crystal layer emits light under the driving of the driving element. The pixel unit receives a data voltage of an analog signal provided by the data line under the control of the scan line for a predetermined time period. The driving element of the pixel unit drives the liquid crystal molecules in the liquid crystal layer to deflect by a corresponding angle according to the data voltage, so as to make the liquid crystal molecules emit light with a corresponding brightness according to the image data, so that the display panel 10 displays an image.

[0042] Referring to Figure 3 , the driving element comprises a storage unit C and a control unit M. The control unit M is electrically connected to the data line, the scan line and the storage unit C. The control unit M can at least comprise a control transistor, and the control transistor comprises a control end, a first end and a second end. The control end of the control transistor is electrically connected to the scan line and receives a scan signal Scan. The first end of the control transistor is electrically connected to the data line and is used for receiving the data signal data. The second end of the control transistor is electrically connected to the storage unit C. The control transistor receives the scan signal Scan and selectively controls the transmission of the data signal data to the storage unit C according to the scan signal Scan. The storage unit C is used for storing electric energy and maintaining the voltage on the opposite sides of the liquid crystal layer.

[0043] The storage unit C can comprise a first capacitor c1 and a second capacitor c2. The first end of the first capacitor c1 is electrically connected to the second end of the control transistor, and the second end of the first capacitor c1 is used for receiving a common display signal vcom. The first end of the second capacitor c2 is electrically connected to the second end of the control transistor, and the second end of the second capacitor c2 is used for receiving a compensation display signal Avcom. The second capacitor c2 is used for reducing the leakage phenomenon of the first capacitor c1.

[0044] Referring to Figure 4 and Figure 5 , Figure 4 As shown in the relationship curve diagram of the refresh rate and the display brightness of the display panel 10 shown in Figure 1 , the refresh rate of the display panel 10 gradually decreases from 144Hz to 48Hz, and the display brightness of the display panel 10 gradually decreases. As shown in Figure 5 , the refresh rate of the display panel 10 gradually decreases from 144Hz to 48Hz, and the display brightness of the display panel 10 gradually decreases. As shown in Figure 1 , the refresh rate of the display panel 10 gradually decreases from 144Hz to 48Hz, and the display brightness of the display panel 10 gradually decreases. As shown in Figure 4 , the refresh rate of the display panel 10 gradually decreases from 144Hz to 48Hz, and the display brightness of the display panel 10 gradually decreases. As shown in Figure 5As shown, m1, m2, m3, m4 respectively indicate the time length of one frame of the display panel 10 when the refresh rate is 144Hz, 120Hz, 72Hz and 48Hz. a indicates the time length of the display time of one frame of the display panel 10. b, c, d, e respectively indicate the time length of the pause time of one frame of the display panel 10 when the refresh rate is 144Hz, 120Hz, 72Hz and 48Hz respectively.

[0045] As the refresh rate is switched to lower, for example Figure 4 and Figure 5 As shown, the display brightness of the display panel 10 gradually decreases from 144Hz to 48Hz. This is because the lower the refresh rate of the display panel 10, the longer the time length of the pause time of one frame. When switching different refresh rates, the leakage phenomenon of the capacitance of the display panel 10 maintaining the pressure difference on both sides of the liquid crystal is different due to different refresh rates, which will cause the display panel to have different degrees of light and dark changes, affecting the display effect of the display panel. In particular, when switching from a higher refresh rate to a lower refresh rate, the corresponding time length of one frame is quite different, for example, from 240Hz to 48Hz, the time length of one frame corresponding to the higher refresh rate and the lower refresh rate can be 5 times different, for example Figure 4 It can be seen that the light and dark changes of the display panel will be more obvious, which seriously affects the display effect of the display panel.

[0046] Based on the above technical problems, the present application provides a display module 200, which can adjust the backlight brightness in real time according to the current refresh rate to compensate for the problem of display picture light and dark changes caused by different leakage degrees of storage units when the refresh rate is switched.

[0047] Please refer to Figure 6 , Figure 6 The circuit structure schematic diagram of the display device 1000 provided by the embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the display device 1000 comprises a display panel 10, a backlight module 20 and a driving circuit 30. Figure 6As shown in the embodiments of the present application, the display device 1000 comprises a display module 200 and a display signal unit 300, the display signal unit 300 provides a display signal for the display module 200 to perform picture display, wherein the display signal comprises information for performing picture display. The display module 200 comprises a display panel 20, a backlight module 30, and a conversion control unit 60 electrically connected with the display panel 20 and the backlight module 30, and the conversion control unit 60 is also electrically connected with the display signal unit 300. The conversion control unit 60 is used for receiving the display signal transmitted by the display signal unit 300 and converting the display signal into various control signals recognizable by the display panel 20 and the backlight module 30. The backlight module 30 is used for receiving the control signal and providing backlight for the display panel 20 according to the control signal. The display panel 20 is used for receiving the control signal and displaying different pictures by using the backlight according to the control signal.

[0048] In the embodiments of the present application, the display signal unit 300 can be a host of the display device 1000, and specifically can comprise a graphics card, which is not specifically limited in the present application.

[0049] In the embodiments of the present application, the conversion control unit 60 can be a system on chip (SOC), also known as a system-level chip, which is not specifically limited in the present application.

[0050] It can be understood that the display device 1000 can be used in electronic devices including but not limited to tablet computers, notebook computers, desktop computers, and the like. According to the embodiments of the present application, the specific type of the display device 1000 is not specifically limited, and those skilled in the art can design the display device 1000 according to the specific use requirements of the application, which will not be described here.

[0051] In the exemplary embodiments, the display device 1000 can also comprise a drive board, a power board, a high-voltage board, a key control board, and other necessary components and parts, and those skilled in the art can supplement the display device 1000 according to the specific type and actual function, which will not be described here.

[0052] Please refer to Figure 7 , Figure 7 for Figure 6 the circuit structure diagram of the display module 200 of the display device 1000. As Figure 7As shown, in the embodiment of the present application, the display panel 20 comprises a display driving unit 25, which is electrically connected with the conversion control unit 60, the backlight module 30 comprises a backlight driving circuit 35, and the conversion control unit 60 comprises a data processing circuit 62 and a timing control circuit 63. The data processing circuit 62 is electrically connected with the timing control circuit 63 and a display signal unit 300 of the display device 1000, and receives a display signal from the display signal unit 300, wherein the display signal contains information for performing picture display. The data processing circuit 62 converts the display signal into a plurality of control signals recognizable by the timing control circuit 63, that is, generates the control signals by format converting the display signal, and transmits the generated control signals to the timing control circuit 63.

[0053] In the embodiment of the present application, the timing control circuit 63 is electrically connected with the display driving unit 25 and the backlight driving circuit 35, the timing control circuit 63 generates a corresponding backlight control signal according to the pre-stored brightness compensation data and the received control signal, and outputs the backlight control signal to the backlight driving circuit 35, the backlight driving circuit 35 receives the backlight control signal, and provides a backlight with corresponding compensation time and corresponding compensation brightness for the current frame display of the display panel 20 according to the backlight control signal to adapt to the pause time when the refresh rate changes, until the backlight control signal is received again.

[0054] In the embodiment of the present application, the backlight driving circuit 35 can at least comprise a timing controller (Timing Control, TCON), also known as a timing controller, which is not specifically limited in the present application.

[0055] In the embodiment of the present application, by setting the timing control circuit 63, the backlight brightness of the pause time of each frame is adjusted according to the refresh rate, so that the obvious light and dark changes caused by different degrees of leakage of the display panel 20 when the refresh rate is switched are reduced or even eliminated, that is, the problem of obvious reduction of display brightness caused by leakage of the display panel 20 can be compensated in real time, and the display effect is improved.

[0056] Please refer to Figure 8 , Figure 8 for Figure 6A diagram of the relationship between different refresh rates of the display module 200 in the display device 1000 is shown. In the embodiment of the present application, each frame of the display panel 20 includes a display time (Active area) and a pause time (Blank area), and the end time of each frame of the display time is the start time of the pause time. The display panel 20 changes the display of the first refresh rate, the second refresh rate, to the Nth refresh rate, and the first refresh rate, the second refresh rate, to the Nth refresh rate are sequentially reduced.

[0057] As shown in Figure 8 The first refresh rate, the second refresh rate, to the Nth refresh rate are all started from the same time T1. The end time of the display time of different refresh rates is T2, that is, the start time of the pause time. That is, the display time of the first refresh rate, the second refresh rate, to the Nth refresh rate is T1-T2.

[0058] T3 is the end time of the pause time of the first refresh rate, and T4 is the end time of the pause time of the second refresh rate, that is, T2-T3 is the pause time of the first refresh rate, and T2-T4 is the pause time of the second refresh rate. Similarly, TN is the end time of the pause time of the Nth refresh rate, that is, T2-TN is the pause time of the Nth refresh rate.

[0059] In the embodiment of the present application, the backlight brightness of the display time and the pause time is controlled respectively. Because the leakage of the storage unit C in the display time is the same under different refresh rates, the leakage in the display time will not cause the difference in display brightness of different refresh rates. Therefore, in the embodiment of the present application, when displaying the same picture, the backlight brightness of the display time under the first refresh rate, the second refresh rate, to the Nth refresh rate is the same.

[0060] However, under different refresh rates, the total leakage of the storage unit C in the pause time is different due to the different lengths of the pause time. However, the leakage changes linearly in the pause time, that is, with the extension of the pause time, the storage unit C leaks uniformly.

[0061] In the embodiments of the present application, the leakage current changes linearly in the pause time, and the backlight is adjusted according to the leakage degree according to the length of the pause time of different refresh rates. The pause time of the Nth refresh rate is divided into N segments according to the pause time of the first refresh rate, the second refresh rate to the N-1th refresh rate. Specifically, the N segments are the start time of the pause time of the first refresh rate to the end time of the pause time of the first refresh rate, that is, the T2 to T3 period. The end time of the pause time of the first refresh rate to the end time of the pause time of the second refresh rate, that is, the T3 to T4 period. The end time of the pause time of the N-1th refresh rate to the end time of the pause time of the Nth refresh rate, that is, the TN-1 to TN period.

[0062] It can be understood that when displaying the same picture, the leakage of the pause time of the second refresh rate in the T2 to T3 period is consistent with the leakage of the pause time of the first refresh rate, that is, the T2 to T3 period, and so on.

[0063] Accordingly, the present application controls the backlight module 30 to provide backlight for the display panel 20 in segments, and no matter what the next frame is, the backlight corresponding to each segment can be provided in turn, avoiding different degrees of brightness change when the display module 200 switches different refresh rates. Further, when receiving the frame display signal, the backlight brightness is adjusted as a whole according to the backlight brightness information contained in the frame display signal, causing the display panel to have obvious light and dark changes due to the delay of backlight brightness adjustment. The present application realizes non-delayed backlight brightness compensation.

[0064] In the embodiments of the present application, the first refresh rate, the second refresh rate to the Nth refresh rate are all started from the same time T1, and the start time to the end time of the pause time of the first refresh rate (T2-T3) corresponds to the first display brightness and the first compensation time. The end time of the pause time of the first refresh rate to the end time of the pause time of the second refresh rate (T3-T4) corresponds to the second display brightness and the second compensation time, and the end time of the pause time of the N-1th refresh rate to the end time of the pause time of the Nth refresh rate (TN-1-TN) corresponds to the Nth display brightness and the Nth compensation time, N is a positive integer greater than two.

[0065] In the embodiments of the present application, it can be understood that the first display brightness is the brightness decay value of the display brightness from the start time to the end time of the pause time of the first refresh rate, and the second display brightness is the brightness decay value of the display brightness from the end time of the pause time of the first refresh rate to the end time of the pause time of the second refresh rate, and so on. It can be understood that the brightness decay value contains information representing the leakage degree of the display panel 20.

[0066] The timing control circuit 63 stores brightness compensation data of the display module 200, the brightness compensation data including first display brightness, second display brightness to Nth display brightness stored in sequence, and first compensation time, second compensation time to Nth compensation time corresponding to the first display brightness, the second display brightness to the Nth display brightness.

[0067] The timing control circuit 63 outputs the backlight control signal to the backlight driving circuit 35 according to the control signal and the brightness compensation data, the backlight control signal controlling the backlight module 30 to provide the display panel 20 with backlight having first compensation brightness, second compensation brightness to Nth compensation brightness in sequence for first compensation time, second compensation time to Nth compensation time, and re-executing the above-mentioned operation of providing backlight when receiving the backlight control signal of the next frame. Specifically, the backlight control signal controls the backlight module 30 to provide backlight with first compensation brightness, second compensation brightness to Nth compensation brightness in sequence, and the time of providing backlight with first compensation brightness, second compensation brightness to Nth compensation brightness is first compensation time, second compensation time to Nth compensation time in sequence, and re-executing the above-mentioned operation of providing backlight when receiving the backlight control signal of the next frame.

[0068] For example, the backlight control signal controls the backlight module 30 to provide backlight with first compensation brightness for first compensation time and backlight with second compensation brightness for second compensation time, and then, when receiving the backlight control signal of the next frame, providing backlight with backlight brightness corresponding to display time and then providing backlight with first compensation brightness, second compensation brightness to Nth compensation brightness in sequence for first compensation time, second compensation time to Nth compensation time.

[0069] In the embodiments of the present application, the first compensation brightness is equal to the first display brightness multiplied by a preset backlight compensation multiple, and the second compensation brightness is equal to the second display brightness multiplied by the preset backlight compensation multiple.

[0070] In the embodiments of the present application, the preset backlight compensation multiple can be equal to the reciprocal of the transmittance of the display panel.

[0071] In the embodiments of the present application, the preset backlight compensation multiple is related to the transmittance of the display panel 20, which is determined by the process, element parameters, etc. of the display panel 20 itself, such as the selection and manufacturing process of the polaroid.

[0072] For example, when the transmittance of the display panel 20 is 5%, the preset backlight compensation multiple can be determined as 20, when the transmittance of the display panel 20 is 4%, the preset backlight compensation multiple can be determined as 25, and when the transmittance of the display panel 20 is 6%, the preset backlight compensation multiple can be determined as 17. It can be understood that the lower the transmittance of the display panel 20, the greater the preset backlight compensation multiple. The preset backlight compensation multiple corresponding to different transmittances is not specifically limited in the present application.

[0073] It should be noted that the higher the display brightness of the display panel 20, the higher the refractive index of the liquid crystal molecules of the display panel 20, and the higher the light output rate. The leakage of the display driving unit 25 is more obvious, so the preset backlight compensation multiple does not need to be adjusted according to the brightness of the display panel 20.

[0074] Please refer to Figure 7 and Figure 9 , Figure 9 for Figure 7 the circuit structure diagram of the display driving unit 25 in the display module 200. In the embodiment of the present application, the timing control circuit 63 is further configured to output a display control signal to the display driving unit 25 according to the control signal, wherein the display control signal comprises information for controlling the deflection of the liquid crystal molecules of the display panel 20. The display driving unit 25 receives and controls the deflection of the liquid crystal molecules according to the display control signal. Specifically, it can control the pressure difference between the electrode layers on both sides of the liquid crystal molecules to drive the liquid crystal molecules to deflect by a corresponding angle, so as to emit corresponding light and display a corresponding picture.

[0075] In the embodiment of the present application, the display signal unit 300 outputs and transmits display signals to the data processing circuit 62. The data processing circuit 62 converts the display signals into a plurality of control signals and transmits the control signals to the timing control circuit 63. The timing control circuit 63 receives the control signals and outputs corresponding display control signals to the display driving unit 25 according to the control signals. The display driving unit 25 receives the display control signals and processes the display control signals to drive the display panel 20 to display pictures. Specifically, the display driving unit 25 can perform digital-to-analog conversion (Digital to Analog, DA) on the display control signals, output analog signal gray voltage to the display panel 20, and drive the display panel 20 to display pictures.

[0076] As shown in Figure 9As shown in the embodiment of the present application, the display driving unit 25 includes a power management circuit 42, a timing circuit 43, a gamma circuit 44 and a driving circuit 46. The power management circuit 42 and the timing circuit 43 are electrically connected with the timing control circuit 63, the power management circuit 42 is further electrically connected with the gamma circuit 44 and the driving circuit 46, and the timing circuit 43 is further electrically connected with the gamma circuit 44 and the driving circuit 46. The display panel 20 displays corresponding pictures under the control of the display driving unit 25.

[0077] In the embodiment of the present application, the timing control circuit 63 transmits the display control signal to the timing circuit 43 and the power management circuit 42. The power management circuit 42 receives the display control signal and allocates power supply for the timing circuit 43, the gamma circuit 44 and the driving circuit 46 according to the display control signal.

[0078] The timing circuit 43 receives the display control signal and controls the signal transmission timing of the gamma circuit 44 and the driving circuit 46 according to the timing information contained in the display control signal.

[0079] The gamma circuit 44 receives the display control signal, converts the data signal data in the display control signal into an analog signal, and transmits the analog signal to the driving circuit 46. The driving circuit 46 drives the display panel 20 to perform picture display according to the received analog signal.

[0080] Please refer to Figure 10 , Figure 10 For Figure 6 The driving effect schematic diagram of the display device 1000 is shown. As Figure 10 shown, the time period from t1 to t2 is the display time of the next frame at different refresh rates, the time period from t2 to t3 corresponds to the pause time of one frame at a refresh rate of 144Hz, the time period from t2 to t4 corresponds to the pause time of one frame at a refresh rate of 120Hz, and the time period from t2 to t5 corresponds to the pause time of one frame at a refresh rate of 48Hz. At this time, the first compensation time corresponds to the period from t2 to t3, the second compensation time corresponds to the period from t3 to t4, and the third compensation time corresponds to the period from t4 to t5.

[0081] Here, the backlight brightness at the starting moment of the mth compensation time is recorded as the first brightness, the backlight brightness at the ending moment of the mth compensation time is recorded as the second brightness, and the first brightness is less than the second brightness.

[0082] In this embodiment, the backlight driving circuit 35 controls the backlight brightness to gradually increase from the first brightness to the second brightness within the m-th compensation time period according to the backlight control signal. The average brightness within the m-th compensation time period is equal to the m-th compensation brightness, where m is a positive integer greater than or equal to 1 and less than or equal to N. Specifically, the gradual increase can be a uniform increase.

[0083] In this embodiment, during the display time, the backlight brightness oscillates between a peak and a trough. Therefore, the display brightness of the display panel 20 in one frame is the equivalent average brightness of the display brightness during the display time and the display brightness during the pause time. It should be noted that the display brightness during the display time can be the equivalent average value of the brightness of the display panel refracted by the backlight brightness oscillating back and forth during the display time. The display brightness during the pause time can be the brightness of the display panel refracted by the m-th compensated brightness.

[0084] Please see Figure 11 , Figure 11 for Figure 6 This is a schematic diagram illustrating another driving effect of the display device 1000. (As shown...) Figure 11 As shown, the time intervals t1 to t2 represent the display time of the next frame at different refresh rates. The time intervals t2 to t3 correspond to the pause time of one frame at a refresh rate of 144Hz, t2 to t4 correspond to the pause time of one frame at a refresh rate of 120Hz, and t2 to t5 correspond to the pause time of one frame at a refresh rate of 48Hz. Therefore, the first compensation time corresponds to the t2-t3 time interval, the second compensation time to the t3-t4 time interval, and the third compensation time to the t4-t5 time interval.

[0085] Here, the backlight brightness at the start of the m-th compensation time is denoted as the first brightness, and the backlight brightness at the end of the m-th compensation time is denoted as the second brightness, and the first brightness is less than the second brightness.

[0086] In this embodiment of the application, the backlight driving circuit 35 controls the backlight brightness to oscillate from the first brightness and gradually increase to the second brightness within the m-th compensation time according to the backlight control signal, and the average brightness within the pause time is equal to the m-th compensation brightness.

[0087] In this embodiment, during the display time, the backlight brightness oscillates between a peak and a trough. Therefore, the display brightness of the display panel 20 in one frame is the equivalent average brightness of the display brightness during the display time and the display brightness during the pause time. It should be noted that the display brightness during the display time is the average brightness of the display panel refracted by the backlight brightness oscillating back and forth during the display time. The display brightness during the pause time is the brightness of the display panel refracted by the m-th compensated brightness.

[0088] It can be understood that, Figure 10 , Figure 11 The display device 1000 can also be used to display a picture at other refresh rates, and the working principle is similar to that shown in Figure 10 and Figure 11 , which will not be repeated here.

[0089] In summary, in the display module 200 and the display device 1000 of the present application, by setting the timing control circuit 63, the leakage of the display panel 20 is linearly changed in the standby time, and the backlight brightness of the display time and the standby time is controlled separately. At the same time, when displaying the same picture, the leakage of the standby time of the second refresh rate in the T2-T3 period is consistent with the leakage of the standby time of the first refresh rate in the T2-T3 period, and according to the different lengths of the standby time of different refresh rates, the backlight brightness of the compensation time of a frame of the display panel 20 is controlled in sections, which avoids the obvious light and dark changes caused by different leakage degrees when switching between different refresh rates, and even eliminates it, that is, the problem of real-time compensation of the significant decrease of display brightness caused by the leakage of the display panel 20. Further, it avoids the problem of obvious changes in display panel light and dark caused by the delay of backlight brightness adjustment when receiving the frame display signal and adjusting the backlight brightness according to the backlight brightness information contained in the frame display signal, and the present application realizes non-delay adjustment of backlight brightness, thereby improving the display effect of the display device 1000.

[0090] All possible combinations of the technical features in the above embodiments are described, however, as long as there is no contradiction in the combination of the technical features, it should be considered as the scope described in the present application.

[0091] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0092] It should be understood that the above-described embodiments are merely illustrative of several ways in which the present application can be implemented and that the description is relatively specific and detailed to afford a thorough understanding of the application. However, it is to be understood that the application can be practiced with only some or all of these details. Indeed, the application can be implemented with other elements, components, methods, etc. without departing from the spirit and scope of the application. Accordingly, the scope of the application should be determined not with reference to the above description, but instead with reference to the appended claims along with their full scope of equivalents.

Claims

1. A display module for performing display of a picture, the display module comprising a display panel and a backlight module, characterized by The backlight module comprises a backlight driving circuit, and the display module further comprises a conversion control unit electrically connected with the display panel and the backlight driving circuit of the backlight module; the display panel displays at a first refresh rate, a second refresh rate to an Nth refresh rate, and the first refresh rate, the second refresh rate to the Nth refresh rate decrease in turn; The first refresh rate, the second refresh rate to the Nth refresh rate are all started at the same time, the start time to the end time of the pause time of the first refresh rate is a first display brightness and a first compensation time, the end time of the pause time of the first refresh rate to the end time of the pause time of the second refresh rate is a second display brightness and a second compensation time, the end time of the pause time of the N-1th refresh rate to the end time of the pause time of the Nth refresh rate corresponds to an Nth display brightness and an Nth compensation time, wherein N is a positive integer greater than 2; The conversion control unit receives a display signal, converts the display signal to generate a control signal, generates a corresponding backlight control signal according to the control signal and pre-stored brightness compensation data, and outputs the backlight control signal to the backlight driving circuit; the backlight driving circuit receives the backlight control signal, and according to the backlight control signal, provides a backlight with a corresponding compensation time and a corresponding compensation brightness to the display panel for current frame display in turn to adapt to the pause time of different refresh rates until the next frame of backlight control signal is received; wherein the brightness compensation data comprises the first display brightness, the second display brightness to the Nth display brightness stored in turn, and the first compensation time, the second compensation time to the Nth compensation time corresponding thereto.

2. The display module of claim 1, wherein, The display brightness of the current frame of the display panel is equal to the equivalent average brightness of the display brightness of the display time and the display brightness of the pause time.

3. The display module of claim 2, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The conversion control unit comprises a data processing circuit and a timing control circuit, the timing control circuit is electrically connected with the data processing circuit, the display panel and the backlight driving circuit, the data processing circuit receives the display signal, converts the display signal to generate the control signal, and transmits the generated control signal to the timing control circuit; The timing control circuit generates the backlight control signal according to the brightness compensation data and the control signal, and outputs the backlight control signal to the backlight driving circuit.

4. The display module of claim 3, wherein the display module is configured to be mounted on a display device. The timing control circuit outputs the backlight control signal to the backlight driving circuit according to the control signal and the brightness compensation data, the backlight control signal controls the backlight module to provide the backlight with the first compensation brightness, the second compensation brightness to the Nth compensation brightness to the display panel in turn according to the first compensation time, the second compensation time to the Nth compensation time, wherein the first compensation brightness is equal to the first display brightness multiplied by a preset backlight compensation multiple, the second compensation brightness is equal to the second display brightness multiplied by the preset backlight compensation multiple, and the Nth compensation brightness is equal to the Nth display brightness multiplied by the preset backlight compensation multiple.

5. The display module of claim 4, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The preset backlight compensation multiple is equal to the reciprocal of the light transmittance of the display panel.

6. The display module of claim 1, wherein, The backlight brightness at the start moment of the mth compensation time in the Nth compensation time is a first brightness, the backlight brightness at the end moment of the mth compensation time is a second brightness, and the first brightness is less than the second brightness, the backlight driving circuit controls the backlight brightness to increase from the first brightness to the second brightness in the mth compensation time according to the backlight control signal, and the average brightness in the mth compensation time is equal to the mth compensation brightness, wherein m is a positive integer greater than or equal to 1 and less than or equal to N.

7. The display module of claim 1, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The backlight brightness at the start moment of the mth compensation time in the Nth compensation time is a first brightness, the backlight brightness at the end moment of the mth compensation time is a second brightness, and the first brightness is less than the second brightness, the backlight driving circuit controls the backlight brightness to oscillate from the first brightness to the second brightness in the mth compensation time according to the backlight control signal, and the average brightness in the mth compensation time is equal to the mth compensation brightness, wherein m is a positive integer greater than or equal to 1 and less than or equal to N.

8. The display module of claim 3, wherein the display module is configured to be mounted on a display stand. The display panel comprises a display driving unit, the timing control circuit is electrically connected with the display driving unit and outputs a display control signal to the display driving unit according to the control signal, and the display control signal comprises information for controlling the deflection of liquid crystal molecules of the display panel.

9. The display module of claim 8, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The display driving unit comprises a power management circuit, a timing circuit, a gamma circuit and a driving circuit, wherein, The power management circuit is electrically connected with the timing control circuit, the timing circuit, the gamma circuit and the driving circuit, receives the display control signal from the timing control circuit, and allocates power supply to the timing circuit, the gamma circuit and the driving circuit according to the display control signal, and the timing control circuit is further used for transmitting the display control signal to the timing circuit; The timing circuit is further electrically connected with the timing control circuit, the gamma circuit and the driving circuit, receives the display control signal from the timing control circuit, and controls the signal transmission timing of the gamma circuit and the driving circuit according to the timing information contained in the display control signal; The gamma circuit is also electrically connected with the driving circuit, the gamma circuit receives the display control signal from the power management circuit, converts a data signal in the display control signal into an analog signal, and transmits the analog signal to the driving circuit; The driving circuit drives the display panel to perform picture display according to the received analog signal.

10. A display device, characterized by comprising: The display device comprises a display signal unit and the display module as claimed in any one of claims 1-9, and the display signal unit provides a display signal for the display module to perform picture display.

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