CN109448642B - Display module, driving method thereof and display device - Google Patents
Display module, driving method thereof and display device Download PDFInfo
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- CN109448642B CN109448642B CN201811524838.5A CN201811524838A CN109448642B CN 109448642 B CN109448642 B CN 109448642B CN 201811524838 A CN201811524838 A CN 201811524838A CN 109448642 B CN109448642 B CN 109448642B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
Abstract
The invention discloses a display module, a driving method thereof and a display device, relating to the technical field of display, wherein the display module comprises a display module, a display area and a non-display area, and the display module comprises: the display panel comprises a plurality of pixel unit rows and a grid driving circuit, wherein the grid driving circuit sends driving signals to the pixel unit rows; the backlight module comprises a plurality of LED lamps and a backlight driving circuit, and the backlight driving circuit sends a starting signal to the LED lamps; the control chip is electrically connected with the grid driving circuit and the sub-pixel units and sends data signals to the sub-pixel units; the backlight driving circuit is also electrically connected with the grid driving circuit and receives a first trigger signal sent by the grid driving circuit. The first trigger signal is provided to the backlight drive circuit through the gate drive circuit, so that the LED lamps in the backlight module are lighted and displayed synchronously or later than the display picture, and the display effect of the display module and the display device is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display module, a driving method thereof and a display device.
Background
Liquid crystal displays, which are flat, ultra-thin display devices, consist of a certain number of color or black and white pixels placed in front of a light source or a reflective surface. Liquid crystal displays are very low power consuming and are therefore favored by engineers for use in battery-operated electronic devices.
The working principle of the liquid crystal display is as follows: the liquid crystal is a special substance between solid and liquid, which is an organic compound, normally in a liquid state, but its molecular arrangement is very regular as that of a solid crystal, and therefore, it is called a liquid crystal, and another special property thereof is that if an electric field is applied to the liquid crystal, its molecular arrangement is changed, and at this time if a polarizing plate is fitted thereto, it has a function of preventing light from passing therethrough (light can pass smoothly without applying an electric field), and if a color filter is fitted thereto, the magnitude of voltage applied to the liquid crystal is changed, so that the amount of light transmission of a certain color can be changed, and also it can be said that the transmittance thereof can be changed by changing the voltage applied to both ends of the liquid crystal.
With the development of liquid crystal display technology, the application field of liquid crystal displays, especially color liquid crystal displays, is also widening. Pulled by the market of liquid crystal displays and the backlight industry, the liquid crystal display displays a splendid scene. The liquid crystal display device is a non-luminous display device, and the display function can be achieved only by a backlight source. Since high performance backlight technology must be used in conjunction with high definition and large size lcd devices, the lcd industry is striving to develop new application fields, and the high performance of the backlight technology also plays a role as a back assistant.
In the prior art, a time difference usually occurs between the lighting of the LEDs in the backlight module and the dynamic image display of the display panel, so that the display time of the display image is later than the lighting time of the LEDs, that is, a phenomenon that the LEDs in the backlight module are already lighted but the display image is not yet displayed may occur, thereby reducing the display effect of the display device.
Disclosure of Invention
In view of this, the present invention provides a display module, a driving method thereof and a display device, wherein an input terminal of a backlight driving circuit is connected to a gate driving circuit in a display panel, and the gate driving circuit provides a first trigger signal to the backlight driving circuit, so that the lighting of an LED lamp in the backlight module is synchronous with or later than a display picture, thereby facilitating to improve the display effect of the display module and the display device.
In a first aspect, the present application provides a display module assembly, be provided with the display area and encircle the non-display area in display area, display module assembly includes:
the display panel comprises a plurality of pixel unit rows positioned in the display area and a grid driving circuit positioned in the non-display area, wherein the grid driving circuit is electrically connected with the pixel unit rows and sends driving signals to the pixel unit rows, and the pixel unit rows comprise a plurality of sub-pixel units;
the backlight module comprises a plurality of LED lamps positioned in the display area and a backlight driving circuit positioned in the non-display area, and the backlight driving circuit is electrically connected with the LED lamps and sends starting signals to the LED lamps;
the control chip is positioned in the non-display area, is electrically connected with the grid driving circuit and the sub-pixel unit, and sends a data signal to the sub-pixel unit;
the backlight driving circuit is also electrically connected with the grid driving circuit and receives a first trigger signal sent by the grid driving circuit, and the first trigger signal is used for starting the backlight driving circuit to enable the backlight driving circuit to send a driving signal to the LED lamp.
In a second aspect, the present application provides a display device, including a display module, the display module being the display module provided by the present application.
In a third aspect, the present application provides a driving method for a display module, where the display module is provided with a display area and a non-display area surrounding the display area, and the display module includes:
the display panel comprises a plurality of pixel unit rows positioned in the display area and a grid driving circuit positioned in the non-display area, wherein the grid driving circuit is electrically connected with the pixel unit rows and sends driving signals to the pixel unit rows, and the pixel unit rows comprise a plurality of sub-pixel units;
the backlight module comprises a plurality of LED lamps positioned in the display area and a backlight driving circuit positioned in the non-display area, and the backlight driving circuit is electrically connected with the LED lamps and sends starting signals to the LED lamps; the backlight driving circuit is also electrically connected with the grid driving circuit;
the control chip is positioned in the non-display area, is electrically connected with the grid driving circuit and the sub-pixel unit, and sends a data signal to the sub-pixel unit;
the driving method of the display module comprises the following steps:
the control chip controls the grid drive circuit to send a drive signal to the pixel unit row and scans the pixel unit row;
the grid driving circuit sends a first trigger signal to the backlight driving circuit, and the backlight driving circuit is started to enable the backlight driving circuit to send a driving signal to the LED lamp.
Compared with the prior art, the display module, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
the display module, the driving method of the display module and the display device comprise a display panel, a backlight module and a control chip, wherein the backlight module comprises a plurality of LED lamps and a backlight driving circuit used for driving the LED lamps to emit light, the display panel comprises a grid driving circuit electrically connected with a plurality of pixel unit rows, and the backlight driving circuit drives the LED lamps to emit light to provide a light source for display of the display panel. Particularly, the backlight driving circuit in the application is electrically connected with the gate driving circuit, and the gate driving circuit sends a first trigger signal to the backlight driving circuit to prompt the backlight driving circuit to send a starting signal to the LED lamp. Generally, the gate driving circuit scans the pixel unit rows line by line, and the scanned pixel unit rows receive the display data signals, so that when the signal of the gate driving circuit is used as the trigger signal of the backlight driving circuit, the process of the backlight driving circuit driving the LED lamp to emit light can be synchronized with the process of the pixel unit rows receiving the display data signals, or the process of the backlight driving circuit driving the LED lamp to emit light is slightly later than the process of the pixel unit rows receiving the display data signals, that is, the lighting of the LED lamp in the backlight module is synchronized with the display picture or later than the display picture, and the design improves the phenomenon that the lighting of the LED lamp in the backlight module is earlier than the display picture in the prior art, thereby being beneficial to improving the display effect of the display module and the display device.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a cross-sectional view of a display module according to an embodiment of the present disclosure;
fig. 2 is a top view of a display panel and a control chip provided in an embodiment of the present application;
fig. 3 is a top view of a backlight module according to an embodiment of the disclosure;
fig. 4 is a connection diagram of a gate driving circuit and a backlight driving circuit according to an embodiment of the present disclosure;
fig. 5 is a diagram illustrating another connection relationship between a gate driving circuit and a backlight driving circuit according to an embodiment of the disclosure;
fig. 6 is a diagram illustrating another connection relationship between a gate driving circuit and a backlight driving circuit according to an embodiment of the disclosure;
fig. 7 is a connection diagram of a level shifter and a backlight driving circuit according to an embodiment of the present disclosure;
fig. 8 is a diagram illustrating a connection relationship between the switch circuit and the LED lamp according to the embodiment of the present application;
fig. 9 is a top view of a display device according to an embodiment of the present application;
fig. 10 is a flowchart illustrating a driving method of a display module according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the prior art, when the backlight module is a direct-type backlight module, the LED lamps in the backlight module provide light sources to the pixel units directly above the backlight module, and the rows of the pixel units on the display panel are usually driven line by line, so that the backlight module with partitioned display of the LED lamps also appears, that is, the LED lamps are also driven line by line.
In view of this, the present invention provides a display module, a driving method thereof and a display device, wherein an input terminal of a backlight driving circuit is connected to a gate driving circuit in a display panel, and the gate driving circuit provides a first trigger signal to the backlight driving circuit, so that the lighting of an LED lamp in the backlight module is synchronous with or later than a display picture, thereby facilitating to improve the display effect of the display module and the display device.
The following detailed description is to be read in connection with the drawings and the detailed description.
Fig. 1 is a cross-sectional view of a display module according to an embodiment of the present disclosure, fig. 2 is a top view of a display panel and a control chip according to an embodiment of the present disclosure, fig. 3 is a top view of a backlight module according to an embodiment of the present disclosure, fig. 4 is a connection diagram of a gate driving circuit and a backlight driving circuit according to an embodiment of the present disclosure, and with reference to fig. 1 to fig. 4, a display module 100 according to an embodiment of the present disclosure is provided, which includes a display area 10 and a non-display area 11 surrounding the display area 10, and the display module 100 includes:
a display panel 20 including a plurality of pixel unit rows 21 in the display region 10 and a gate driving circuit 22 in the non-display region 11, the gate driving circuit 22 being electrically connected to the pixel unit rows 21 and transmitting a driving signal to the pixel unit rows 21, the pixel unit rows 21 including a plurality of sub-pixel units 25;
the backlight module 30 comprises a plurality of LED lamps 31 positioned in the display area 10 and a backlight driving circuit 32 positioned in the non-display area 11, wherein the backlight driving circuit 32 is electrically connected with the LED lamps 31 and sends a starting signal to the LED lamps 31;
a control chip 40 located in the non-display region 11, electrically connected to the gate driving circuit 22 and the sub-pixel unit 25, and transmitting a data signal to the sub-pixel unit 25;
the backlight driving circuit 32 is further electrically connected to the gate driving circuit 22, and receives a first trigger signal sent by the gate driving circuit 22, where the first trigger signal is used to start the backlight driving circuit 32, so that the backlight driving circuit 32 sends a driving signal to the LED lamp 31.
The first trigger signal sent by the gate driving circuit 22 to the backlight driving circuit 32 may be, for example, an STV signal in the gate driving circuit 22.
Specifically, referring to fig. 2, the display module 100 provided in the embodiment of the present disclosure is provided with a display area 10 and a non-display area 11 surrounding the display area 10, the display module 100 includes a display panel 20, and the display panel 20 includes a plurality of sub-pixel units 25 arranged horizontally and vertically. Alternatively, a plurality of sub-pixel units 25 located in the same row constitute one pixel unit row 21; alternatively, a part of the sub-pixel units 25 located in the same row constitute one pixel unit row 21. The display panel 20 further includes a gate driving circuit 22 electrically connected to the pixel unit row 21, and the gate driving circuit 22 sends a driving signal to the pixel unit row 21, wherein the gate driving circuit 22 includes N +1 cascaded gate driving units 36, each gate driving unit 36 corresponds to one pixel unit row 21, so that the sub-pixel units 25 in the pixel unit row 21 corresponding to the gate driving unit 36 can be scanned row by row. The display module 100 further includes a backlight module 30, please refer to fig. 3, in which the backlight module 30 includes a plurality of LED lamps 31 respectively arranged along a first direction and a second direction, the LED lamps 31 are used for providing a light source for the display panel 20, the backlight module 30 further includes a backlight driving circuit 32, the backlight driving circuit 32 is located in the non-display region 11 and electrically connected to the LED lamps 31, and is used for sending a start signal to the LED lamps 31 to drive the LED lamps 31 to emit light. With reference to fig. 2, the display module 100 further includes a control chip 40, and the control chip 40 is located in the non-display region 11 and electrically connected to the gate driving circuit 22 and the sub-pixel unit 25, so that the gate driving circuit 22 can be activated and triggered by the control chip 40, and the control chip 40 can also send a data signal to the sub-pixel unit 25. In addition, referring to fig. 4, the backlight driving circuit 32 is electrically connected to the gate driving circuit 22, and the backlight driving circuit 32 is started to drive the LED lamp 31 to emit light by using the first trigger signal sent by the gate driving circuit 22 as a trigger signal for starting the backlight driving circuit 32; because the signal for driving the LED lamp to emit light is emitted after the backlight driving circuit is started, and the display data signal is emitted after the grid driving circuit is started, when the signal of the grid driving circuit is used as the trigger signal of the backlight driving circuit, the start of the backlight driving circuit is synchronized with or later than the start of the gate driving circuit, it is possible to synchronize the process of driving the LED lamps by the backlight driving circuit to emit light with the process of receiving the display data signals by the pixel cell rows, or the process of driving the LED lamp by the backlight driving circuit to emit light is slightly later than the process of receiving the display data signal by the pixel unit row, that is, the LED lamp 31 in the backlight module 30 is lighted synchronously with or later than the display picture, the design improves the phenomenon that the LED lamp in the backlight module is lighted earlier than the display picture in the prior art, thereby being beneficial to improving the display effect of the display module 100.
It should be noted that fig. 2 and fig. 3 only schematically show the relative positions of the display area 10 and the non-display area 11 in the display module 100, and do not represent actual dimensions. In addition, each pixel unit row 21 in fig. 2 includes a plurality of sub-pixel units 25, which are only schematically illustrated in the figure and do not represent actual sizes and numbers, and the present application does not specifically limit the present invention. In addition, fig. 3 only schematically shows one arrangement of the LED lamps 31 on the backlight module 30, and does not represent the actual number and distribution position.
Optionally, with continued reference to fig. 2, the display panel 20 provided in the embodiment of the present application further includes a plurality of gate lines 23 extending along the first direction and arranged along the second direction, and a plurality of data lines 24 extending along the second direction and arranged along the first direction, where two adjacent gate lines 23 and two adjacent data lines 24 intersect to define a plurality of sub-pixel units 25. The gate driving circuit 22 is electrically connected to the gate line 23, and transmits a gate driving signal to the pixel unit row 21 through the gate line 23; the control chip 40 is electrically connected to the data line 24, and transmits a data signal to the sub-pixel unit 25 through the data line 24. Specifically, referring to fig. 2, taking the viewing angle shown in fig. 2 as an example, the transverse direction is taken as the first direction, the longitudinal direction is taken as the second direction, every two adjacent gate lines 23 and two adjacent data lines 24 intersect to form a sub-pixel unit 25, a plurality of sub-pixel units 25 arranged along the first direction and located in the same row form a pixel unit row 21, and each gate driving unit 36 in the gate driving circuit 22 is electrically connected to the corresponding gate line 23, so that one gate driving unit 36 can drive the sub-pixel unit 25 in the entire row through the corresponding gate line 23 without requiring one sub-pixel unit 25 to correspond to one gate driving unit 36, thereby improving the utilization rate of the gate driving circuit 22 and effectively reducing the circuit complexity. After the corresponding pixel unit row 21 is scanned by the gate driving unit 36, the control chip 40 sends a data signal to the corresponding sub-pixel unit 25 through the data line, thereby implementing the line-by-line display function of the display panel 20.
Optionally, with continuing reference to fig. 4, the gate driving circuit 22 provided in the embodiment of the present application includes a plurality of cascaded gate driving units 36, where each gate driving unit 36 includes an input end 26, a first output end 27, and a second output end 28; the input end 26 of the gate driving unit 36 at the first stage is connected to the control chip 40 through the start trigger signal line 29, and receives a start trigger signal sent by the control chip 40 through the start trigger signal line 29; the first output end 27 of each gate driving unit 36 is connected to the input end 26 of the next gate driving unit 36, and the second output end 28 of each gate driving unit 36 is connected to the gate line 23. Specifically, the gate driving circuit 22 includes N +1 cascaded gate driving units 36, the control chip 40 sends a start trigger signal to the first-stage gate driving unit 36 through the input end 26 of the first-stage gate driving unit 36, and the first-stage gate driving unit 36 receives the start trigger signal and then is connected to the corresponding gate line 23 through the second output end 28, so as to send a driving signal to the corresponding pixel unit row 21, and scan the pixel unit row. In addition, the output signal of the first output end 27 of the first stage gate driving unit 36 is used as the input signal of the second stage gate driving unit 36, the output signal of the first output end 27 of the second stage gate driving unit 36 is used as the input signal of the third stage gate driving unit 36, the output signal of the second output end 28 of the second stage gate driving unit 36 is used as the driving signal of the pixel unit row corresponding to the output signal, and so on, the output signal of the first output end 27 of the nth stage gate driving unit 36 is used as the input signal of the N +1 stage gate driving unit 36, and the output signal of the second output end 28 is used as the driving signal of the pixel unit row corresponding to the output signal, so that the control chip 40 only needs to send the start trigger signal to the first stage gate driving unit 36 through the start trigger signal line 29, and does not need to send the start trigger signals to all the gate driving units 36 respectively, therefore, the gate driving units 36 at different levels can scan the corresponding pixel unit rows 21 step by step, and circuit routing can be effectively reduced, so that circuit complexity is reduced, and anti-interference performance is improved.
Optionally, with continued reference to fig. 4, an input end of the backlight driving circuit 32 provided in the embodiment of the present application is electrically connected to the first output end 27 of the last gate driving unit 36, and the first output end 27 of the last gate driving unit 36 sends a first trigger signal to the backlight driving circuit 32; the output terminal of the backlight driving circuit 32 is electrically connected to the LED lamp 31.
Specifically, please refer to fig. 4, in this embodiment, the output signal of the first output end 27 of the last stage gate driving unit 36 is used as the trigger signal of the backlight driving circuit 32, the backlight driving circuit 32 is started, so that the backlight driving circuit 32 outputs a signal to the LED lamp 31 to drive the LED lamp 31 to emit light, that is, after completing one scanning of all the pixel unit rows, the backlight driving circuit 32 is started, so that the light emitting process of the LED lamp 31 is later than the process of receiving the display data signal by the pixel unit row 21, that is, the lighting of the LED lamp 31 in the backlight module 30 is later than the display frame, thereby avoiding the phenomenon that the LED lamp 31 in the backlight module 30 is already lighted but the display frame is not yet displayed, and facilitating to improve the display effect of the display module 100.
Optionally, referring to fig. 5, fig. 5 is another connection relationship diagram of the gate driving circuit 22 and the backlight driving circuit 32 provided in the embodiment of the present application, an input end of the backlight driving circuit 32 is electrically connected to the start trigger signal line 29, and receives a start trigger signal sent by the control chip 40 through the start trigger signal line 29, where the start trigger signal is used as the first trigger signal; the output terminal of the backlight driving circuit 32 is electrically connected to the LED lamp 31.
Specifically, in the embodiment shown in fig. 5, the start trigger signal line 29 connected to the control chip 40 is connected to the first stage gate driving unit 36 and the backlight driving circuit 32, respectively, the control chip sends the start trigger signal sent by the start trigger signal line 29 to the first stage gate driving unit 36 and the backlight driving circuit 32 at the same time, then drives the pixel unit row by the output signal of the second output end 28 of the first stage gate driving unit 36, and sends the output signal of the backlight driving circuit 32 to the LED lamp 31, and drives the LED lamp 31 to emit light, so that the first gate driving unit 36 and the backlight driving circuit 32 in the gate driving circuit are started at the same time, when the scanning frequency of the gate driving circuit to the pixel unit row is consistent with the scanning frequency of the LEDs in the backlight module, the process of the backlight driving circuit 32 driving the LED lamp 31 to emit light can be synchronized with the process of the pixel unit row 21 receiving the display data signal, that is, the lighting of the LED lamp 31 in the backlight module 30 is synchronous with the display frame, so that the phenomenon that the lighting of the LED lamp 31 in the backlight module 30 is earlier than the display frame in the prior art is improved, and the display effect of the display module 100 is improved. Of course, in some other embodiments of the present application, the scanning frequency of the LEDs in the backlight module and the scanning frequency of the gate driving circuit for the pixel unit rows may be set to be the same or different, which is not specifically limited in the present application.
Optionally, referring to fig. 6, fig. 6 is a diagram illustrating another connection relationship between the gate driving circuit 22 and the backlight driving circuit 32 provided in the embodiment of the present application, where the gate driving unit 36 includes N +1 stages, where N is a non-negative integer; the input end of the backlight driving circuit 32 is electrically connected to the first output end 27 of any one gate driving unit 36 of the gate driving units 36 of the first to nth stages, and the first output end 27 sends a first trigger signal to the backlight driving circuit 32; the output terminal of the backlight driving circuit 32 is electrically connected to the LED lamp 31.
Specifically, referring to fig. 6, the gate driving circuit 22 includes N +1 cascaded gate driving units 36. The output signal of the first output terminal 27 of any one of the gate driving units 36 in the first to nth stages may be used as the input signal of the backlight driving circuit 32, for example, the output signal of the first output terminal 27 of the second stage gate driving unit 36 may be input to the backlight driving circuit 32 to drive the LED lamp 31 to emit light, or the output signal of the first output terminal 27 of any other one of the gate driving units 36 may be input to the backlight driving circuit 32 to drive the LED lamp 31 to emit light, which is not particularly limited in this application. When the backlight driving circuit is connected to the first output terminal of the gate driving unit 36 at the nth stage, the triggering of the backlight driving circuit is performed after the scanning of the n sub-pixel unit rows is completed, so that the lighting of the LED lamp 31 in the backlight module 30 is later than the display image, and the phenomenon that the lighting of the LED lamp 31 in the backlight module 30 is earlier than the display image in the prior art is improved, thereby being beneficial to improving the display effect of the display module 100.
Optionally, the display module provided in the embodiment of the present application further includes a level shifter 50, and an input end of the backlight driving circuit 32 is electrically connected to the gate driving circuit 22 through the level shifter. Referring to fig. 7, fig. 7 is a diagram illustrating a connection relationship between a level shifter and a backlight driving circuit 32 according to an embodiment of the present disclosure. Specifically, when the operating voltage of the gate driving circuit 22 is higher than the operating voltage of the backlight driving circuit 32, so that the output signal of the gate driving circuit 22 cannot be directly sent to the backlight driving circuit 32, a level shifter 50 may be added between the gate driving circuit 22 and the backlight driving circuit 32, and the output signal of the gate driving circuit 32 is converted into a level signal that can be received by the backlight driving circuit 32 through the level shifter 50, so as to ensure that the backlight driving circuit 32 can normally operate. It should be noted that there are many implementation manners of the level shifter, for example, the level shifter may be formed by an integrated chip, or the level shifter may be formed by a MOS transistor building circuit, which is not particularly limited in this application.
Optionally, referring to fig. 3, the backlight module 30 is a direct-type backlight module 30, the LED lamps 31 are arranged in an array, for example, the LED lamps 31 are uniformly distributed on the backlight module 30 along a first direction and a second direction as light emitting sources, the light emitting sources are emitted from the bottom of the display panel 20, so that the backlight can be uniformly transmitted to the whole display panel 20, which is beneficial to improving the display brightness of the display panel 20. It should be noted that fig. 3 only schematically shows an arrangement of the LED lamps 31 on the backlight module 30, and does not represent an actual number and size, and in some other embodiments of the present application, the LED lamps in the backlight module may also adopt other distribution manners, which is not specifically limited in this application.
Optionally, referring to fig. 8, fig. 8 is a connection relationship diagram of the switch circuit 33 and the LED lamps 31 provided in the embodiment of the present application, the backlight module 30 further includes a plurality of switch circuits 33, the LED lamps 31 located in the same row are connected to the same switch circuit 33, and the output end of the backlight driving circuit 32 is electrically connected to each switch circuit 33. Specifically, the LED lamps 31 are divided into rows, and the LED lamps 31 located in the same row are controlled by one switching circuit 33 to be driven and lighted in a row-by-row scanning manner. By the design, the light sources can be independently controlled to be turned on or off in different areas, so that power consumption is reduced, and cost is saved. It should be noted that, in the backlight module provided in the embodiment of the present application, the switch circuit 33 may be formed by using a MOS transistor building circuit, and may also be formed by using other methods, which is not specifically limited in the present application.
Based on the same inventive concept, the present application further provides a display device 200, please refer to fig. 9, fig. 9 is a top view of the display device 200 provided in the present application, which includes the display module 100, and the display module 100 is the display module 100 in any of the embodiments. It should be noted that, in the embodiment of the display device 200 provided in the present application, reference may be made to the embodiment of the display module 100, and repeated descriptions are omitted. The display device 200 provided by the present application may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, is not specifically limited in this application.
Based on the same inventive concept, please refer to fig. 1-3 and fig. 10, fig. 10 is a flowchart illustrating a driving method of a display module 100 according to an embodiment of the present application, and the present application further provides a driving method of a display module 100, wherein the display module 100 is provided with a display area 10 and a non-display area 11 surrounding the display area 10, and the display module 100 includes:
a display panel 20 including a plurality of pixel unit rows 21 in the display region 10 and a gate driving circuit 22 in the non-display region 11, the gate driving circuit 22 being electrically connected to the pixel unit rows 21 and transmitting a driving signal to the pixel unit rows 21, the pixel unit rows 21 including a plurality of sub-pixel units 26;
the backlight module 30 comprises a plurality of LED lamps 31 positioned in the display area 10 and a backlight driving circuit 32 positioned in the non-display area 11, wherein the backlight driving circuit 32 is electrically connected with the LED lamps 31 and sends a starting signal to the LED lamps 31; the backlight driving circuit 32 is also electrically connected to the gate driving circuit 22;
a control chip 40 located in the non-display region 11, electrically connected to the gate driving circuit 22 and the sub-pixel unit 25, and transmitting a data signal to the sub-pixel unit 25;
the driving method of the display module 100 includes:
step 301: the control chip 40 controls the gate driving circuit 22 to send a driving signal to the pixel unit row 21, and scans the pixel unit row 21;
step 302: the gate driving circuit 22 sends a first trigger signal to the backlight driving circuit 32, and activates the backlight driving circuit 32, so that the backlight driving circuit 32 sends a driving signal to the LED lamp 31.
Specifically, referring to fig. 2, the display module 100 provided in the embodiment of the present application is provided with a display area 10 and a non-display area 11 surrounding the display area 10, the display module 100 includes a display panel 20, the display panel 20 includes a plurality of sub-pixel units 25 arranged horizontally and vertically, the plurality of sub-pixel units 25 in the same row form a pixel unit row 21, the display panel 20 further includes a gate driving circuit 22 electrically connected to the pixel unit row 21, and the gate driving circuit 22 sends a driving signal to the pixel unit row 21, so that the sub-pixel units 25 can be scanned line by line. The display module 100 further includes a backlight module 30, please refer to fig. 3, in which the backlight module 30 includes a plurality of LED lamps 31 respectively arranged in a horizontal direction and a vertical direction, the LED lamps 31 are used for providing light sources for the display panel 20, the backlight module 30 further includes a backlight driving circuit 32, the backlight driving circuit 32 is located in the non-display region 11 and electrically connected to the LED lamps 31, and is used for sending a start signal to the LED lamps 31 to drive the LED lamps 31 to emit light. With reference to fig. 2, the display module 100 further includes a control chip 40, and the control chip 40 is located in the non-display region 11 and electrically connected to the gate driving circuit 22 and the sub-pixel unit 25, so that the gate driving circuit 22 can be activated and triggered by the control chip 40, and the control chip 40 can also send a data signal to the sub-pixel unit 25. In addition, referring to fig. 4, the backlight driving circuit 32 is electrically connected to the gate driving circuit 22, and the backlight driving circuit 32 is started to drive the LED lamp 31 to emit light by using the first trigger signal sent by the gate driving circuit 22 as a trigger signal for starting the backlight driving circuit 32; when the signal of the gate drive circuit is used as the trigger signal of the backlight drive circuit, the process that the backlight drive circuit drives the LED lamp to emit light is synchronous with the process that the pixel unit row receives the display data signal, or the process that the backlight drive circuit drives the LED lamp to emit light is slightly later than the process that the pixel unit row receives the display data signal, namely, the LED lamp 31 in the backlight module 30 is lightened and is synchronous with the display picture or is later than the display picture, the phenomenon that the LED lamp is lightened earlier than the display picture in the backlight module in the prior art is improved by the design, and therefore the display effect of the display module 100 is favorably improved.
Optionally, with continuing reference to fig. 4-6, the gate driving circuit 22 provided in the embodiment of the present application includes N +1 cascaded gate driving units 36, where each gate driving unit 36 includes an input end 26, a first output end 27, and a second output end 28; the input end 26 of the gate driving unit 36 at the first stage is connected with the control chip 40 through the starting trigger signal line 29; the first output end 27 of each gate driving unit 36 is connected with the input end 26 of the next gate driving unit 36, and the second output end 28 of each gate driving unit 36 is connected with the gate line 23; an input end of the backlight driving circuit 32 is electrically connected to the start trigger signal line 29, or electrically connected to the first output end 27 of any one gate driving unit 36 among the gate driving units 36 of the first to N +1 th stages; specifically, the gate driving circuit 22 includes N +1 cascaded gate driving units 36, the control chip 40 sends a start trigger signal to the first-stage gate driving unit 36 through the input end 26 of the first-stage gate driving unit 36, and the first-stage gate driving unit 36 receives the start trigger signal and then is connected to the corresponding gate line 23 through the second output end 28, so as to send a driving signal to the corresponding pixel unit row 21, and scan the pixel unit row 21. In addition, the output signal of the first output end 27 of the first stage gate driving unit 36 is used as the input signal of the second stage gate driving unit 36, the output signal of the first output end 27 of the second stage gate driving unit 36 is used as the input signal of the third stage gate driving unit 36, the output signal of the second output end 28 of the second stage gate driving unit 36 is used as the driving signal of the pixel unit row 21 corresponding to the output signal, and so on, the output signal of the first output end 27 of the nth stage gate driving unit 36 is used as the input signal of the N +1 stage gate driving unit 36, the output signal of the second output end 28 is used as the driving signal of the pixel unit row 21 corresponding to the output signal, so that the control chip 40 only needs to send the start trigger signal to the first stage gate driving unit 36 through the start trigger signal line 29, and does not need to send the start trigger signals to all the gate driving units 36 respectively, therefore, the gate driving units 36 at different levels can scan the corresponding pixel unit rows 21 step by step, and circuit routing can be effectively reduced, so that circuit complexity is reduced, and anti-interference performance is improved. In addition, the LED lamp 31 may be driven to emit light by using the start trigger signal output by the control chip 40 or the output signal of the first output terminal 27 of any gate driving unit 36 as the input signal of the backlight driving circuit 32. Therefore, the process of the backlight driving circuit 32 driving the LED lamp 31 to emit light can be synchronized with the process of the pixel unit row 21 receiving the display data signal, or the process of the backlight driving circuit driving the LED lamp 31 to emit light is slightly later than the process of the pixel unit row 21 receiving the display data signal, so that the lighting of the LED lamp 31 in the backlight module 30 is synchronized with the display picture or is later than the display picture, the phenomenon that the lighting of the LED lamp 31 in the backlight module 30 is earlier than the display picture in the prior art is improved, and the display effect of the display module 100 and the display device 200 is improved.
Optionally, in step 301, the control chip 40 controls the gate driving circuit 22 to send a driving signal to the pixel unit row 21, and scans the pixel unit row 21, further including: the control chip 40 sends a start trigger signal to the input end 26 of the gate driving unit 36 located at the first stage through the start trigger signal line 29, so that the gate driving circuit 22 of each stage scans the corresponding pixel unit row 21 step by step. Referring to fig. 4, the control chip 40 sends a start trigger signal to the first-stage gate driving unit 36 through the input end 26 of the first-stage gate driving unit 36, and the first-stage gate driving unit 36 receives the start trigger signal and then is connected to the corresponding gate line 23 through the second output end 28, so as to send a driving signal to the corresponding pixel unit row 21, and scan the pixel unit row 21. In addition, the output signal of the first output end 27 of the first stage gate driving unit 36 is used as the input signal of the second stage gate driving unit 36, the output signal of the first output end 27 of the second stage gate driving unit 36 is used as the input signal of the third stage gate driving unit 36, the output signal of the second output end 28 of the second stage gate driving unit 36 is used as the driving signal of the pixel unit row 21 corresponding to the output signal, and so on, the output signal of the first output end 27 of the nth stage gate driving unit 36 is used as the input signal of the N +1 stage gate driving unit 36, the output signal of the second output end 28 is used as the driving signal of the pixel unit row 21 corresponding to the output signal, so that the control chip 40 only needs to send the start trigger signal to the first stage gate driving unit 36 through the start trigger signal line 29, and does not need to send the start trigger signals to all the gate driving units 36 respectively, therefore, the gate driving units 36 at different levels can scan the corresponding pixel unit rows 21 step by step, and circuit routing can be effectively reduced, so that circuit complexity is reduced, and anti-interference performance is improved.
Optionally, in step 302, the gate driving circuit 22 sends a first trigger signal to the backlight driving circuit 32, and further: the start trigger signal line sends the first trigger signal to the backlight driving circuit 32, or the first output terminal 27 of any one gate driving unit 36 of the gate driving units 36 of the first to N +1 th stages sends the first trigger signal to the backlight driving circuit 32. Specifically, referring to fig. 4-6, the control chip 40 may be connected to the backlight driving circuit 32 through the start trigger signal line 29, and the output start trigger signal is used as the input signal of the backlight driving circuit 32, or the output signal of the first output end 27 of any gate driving unit 36 is used as the input signal of the backlight driving circuit 32, so as to drive the LED lamp 31 to emit light, so that the process of the backlight driving circuit 32 driving the LED lamp 31 to emit light may be synchronized with the process of the pixel unit row 21 receiving the display data signal, or the process of the backlight driving circuit driving the LED lamp 31 to emit light may be slightly later than the process of the pixel unit row 21 receiving the display data signal, so that the lighting of the LED lamp 31 in the backlight module 30 is synchronized with or later than the display frame, and the phenomenon that the lighting of the LED lamp 31 in the backlight module 30 is earlier than the display frame in the prior art is improved, thereby improving the display effect of the display module 100 and the display device 200.
According to the embodiment, the display module, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
the display module, the driving method of the display module and the display device comprise a display panel, a backlight module and a control chip, wherein the backlight module comprises a plurality of LED lamps and a backlight driving circuit used for driving the LED lamps to emit light, the display panel comprises a grid driving circuit electrically connected with a plurality of pixel unit rows, and the backlight driving circuit drives the LED lamps to emit light to provide a light source for display of the display panel. Particularly, the backlight driving circuit in the application is electrically connected with the gate driving circuit, and the gate driving circuit sends a first trigger signal to the backlight driving circuit to prompt the backlight driving circuit to send a starting signal to the LED lamp. Generally, the gate driving circuit scans the pixel unit rows line by line, and the scanned pixel unit rows receive the display data signals, so that when the signal of the gate driving circuit is used as the trigger signal of the backlight driving circuit, the process of the backlight driving circuit driving the LED lamp to emit light can be synchronized with the process of the pixel unit rows receiving the display data signals, or the process of the backlight driving circuit driving the LED lamp to emit light is slightly later than the process of the pixel unit rows receiving the display data signals, that is, the lighting of the LED lamp in the backlight module is synchronized with the display picture or later than the display picture, and the design improves the phenomenon that the lighting of the LED lamp in the backlight module is earlier than the display picture in the prior art, thereby being beneficial to improving the display effect of the display module and the display device.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. The utility model provides a display module assembly, its characterized in that is provided with the display area and encircles the non-display area of display area, display module assembly includes:
the display panel comprises a plurality of pixel unit rows positioned in the display area and a grid driving circuit positioned in the non-display area, wherein the grid driving circuit is electrically connected with the pixel unit rows and sends driving signals to the pixel unit rows, and the pixel unit rows comprise a plurality of sub-pixel units; the grid line structure further comprises a plurality of grid lines extending along the first direction and arranged along the second direction;
the backlight module comprises a plurality of LED lamps positioned in the display area and a backlight driving circuit positioned in the non-display area, and the backlight driving circuit is electrically connected with the LED lamps and sends starting signals to the LED lamps;
the control chip is positioned in the non-display area, is electrically connected with the grid driving circuit and the sub-pixel unit, and sends a data signal to the sub-pixel unit;
the backlight driving circuit is also electrically connected with the grid driving circuit and is used for receiving a first trigger signal sent by the grid driving circuit, and the first trigger signal is used for starting the backlight driving circuit to enable the backlight driving circuit to send a driving signal to the LED lamp;
the grid driving circuit comprises a plurality of cascaded grid driving units, and each grid driving unit comprises an input end, a first output end and a second output end; the input end of the grid driving unit at the first stage is connected with the control chip through a starting trigger signal line, and receives a starting trigger signal sent by the control chip through the starting trigger signal line; the first output end of each gate driving unit is connected with the input end of the next stage of gate driving unit, and the second output end of each gate driving unit is connected with the gate line;
the grid driving unit comprises an N +1 stage, and N is a non-negative integer; the input end of the backlight driving circuit is electrically connected with the first output end of any one of the grid driving units from the first level to the Nth level, and the first output end sends the first trigger signal to the backlight driving circuit; and the output end of the backlight driving circuit is electrically connected with the LED lamp.
2. The display module of claim 1, wherein the display panel further comprises a plurality of data lines extending along the second direction and arranged along the first direction, and two adjacent gate lines and two adjacent data lines intersect to define a plurality of sub-pixel units;
the gate driving circuit is electrically connected with the gate lines and sends gate driving signals to the pixel unit rows through the gate lines; the control chip is electrically connected with the data line and sends data signals to the sub-pixel units through the data line.
3. The display module according to claim 2, wherein an input terminal of the backlight driving circuit is electrically connected to the first output terminal of the last gate driving unit, and the first output terminal of the last gate driving unit sends the first trigger signal to the backlight driving circuit.
4. The display module according to claim 1, further comprising a level shifter, wherein the input terminal of the backlight driving circuit is electrically connected to the gate driving circuit through the level shifter.
5. The display module according to claim 1, wherein the backlight module is a direct-type backlight module, and the LED lamps are arranged in an array.
6. The display module according to claim 5, wherein the backlight module further comprises a plurality of switch circuits, the LED lamps in the same row are connected to the same switch circuit, and the output terminal of the backlight driving circuit is electrically connected to each switch circuit.
7. A display device, comprising the display module of any one of claims 1 to 6.
8. The driving method of the display module is characterized in that the display module is provided with a display area and a non-display area surrounding the display area, and the display module comprises:
the display panel comprises a plurality of pixel unit rows positioned in the display area and a grid driving circuit positioned in the non-display area, wherein the grid driving circuit is electrically connected with the pixel unit rows and sends driving signals to the pixel unit rows, and the pixel unit rows comprise a plurality of sub-pixel units;
the backlight module comprises a plurality of LED lamps positioned in the display area and a backlight driving circuit positioned in the non-display area, and the backlight driving circuit is electrically connected with the LED lamps and sends starting signals to the LED lamps; the backlight driving circuit is also electrically connected with the grid driving circuit;
the control chip is positioned in the non-display area, is electrically connected with the grid driving circuit and the sub-pixel unit, and sends a data signal to the sub-pixel unit;
the driving method of the display module comprises the following steps:
the control chip controls the grid drive circuit to send a drive signal to the pixel unit row and scans the pixel unit row;
the grid electrode driving circuit sends a first trigger signal to the backlight driving circuit, and the backlight driving circuit is started to enable the backlight driving circuit to send a driving signal to the LED lamp;
the grid driving circuit comprises N +1 cascaded grid driving units, and each grid driving unit comprises an input end, a first output end and a second output end; the input end of the grid driving unit positioned at the first stage is connected with the control chip through a starting trigger signal wire; the first output end of each gate driving unit is connected with the input end of the next stage of gate driving unit, and the second output end of each gate driving unit is connected with a gate line;
the input end of the backlight driving circuit is electrically connected with the starting trigger signal line, or is electrically connected with the first output end of any one of the grid driving units from the first level to the (N + 1) th level;
the control chip controls the gate driving circuit to send driving signals to the pixel unit row, and scans the pixel unit row, further comprising:
the control chip sends a starting trigger signal to the input end of the gate drive unit positioned at the first stage through the starting trigger signal line, so that the gate drive circuits of all stages scan corresponding pixel units step by step;
the gate driving circuit sends a first trigger signal to the backlight driving circuit, and the method further comprises the following steps:
the start trigger signal line sends a first trigger signal to the backlight driving circuit, or the first output end of any one of the gate driving units of the first to (N + 1) th stages sends a first trigger signal to the backlight driving circuit.
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| CN111986607B (en) * | 2020-08-19 | 2021-12-03 | 武汉华星光电技术有限公司 | Display panel and display device |
| CN113178159B (en) * | 2021-04-23 | 2022-11-25 | 京东方科技集团股份有限公司 | Initial signal providing module, method and splicing display device |
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| CN101441856B (en) * | 2008-12-26 | 2010-09-29 | 友达光电股份有限公司 | Backlight module and method for controlling lightness thereof |
| CN104464602A (en) * | 2014-12-25 | 2015-03-25 | 上海天马微电子有限公司 | Display panel, display panel driving method, driving device and display device |
| CN106952605B (en) * | 2017-05-16 | 2020-08-11 | 厦门天马微电子有限公司 | Shift register and display panel |
| CN107437403B (en) * | 2017-08-10 | 2019-10-25 | 武汉华星光电技术有限公司 | Display device and its driving method |
| CN107731174B (en) * | 2017-10-31 | 2019-12-24 | 武汉天马微电子有限公司 | Display device and electronic equipment |
| CN107978280A (en) * | 2017-12-12 | 2018-05-01 | 北京京东方光电科技有限公司 | A kind of backlight module driving method, device, display device and backlight module |
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