CN109686320B - Backlight module, driving method thereof and display device - Google Patents
Backlight module, driving method thereof and display device Download PDFInfo
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- CN109686320B CN109686320B CN201910067763.0A CN201910067763A CN109686320B CN 109686320 B CN109686320 B CN 109686320B CN 201910067763 A CN201910067763 A CN 201910067763A CN 109686320 B CN109686320 B CN 109686320B
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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
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Chemical & Material Sciences (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a backlight module, a driving method thereof and a display device, comprising the following steps: the scanning driving module is used for driving the light emitting area to emit light; the light emitting region includes: a plurality of control lines, a plurality of signal lines, a plurality of light emitting units; the data updating module comprises a first storage unit and a second storage unit which are electrically connected; before the light-emitting stage, the first storage unit is used for receiving the data signal of the 1 st light-emitting frame and transmitting the data signal to the second storage unit; in an mth light emitting frame, the second storage unit is used for providing the data signals of the mth light emitting frame to the signal line, the first storage unit is used for receiving the data signals of the (m + 1) th light emitting frame, and the first storage unit transmits the data signals of the (m + 1) th light emitting frame to the second storage unit before the (m + 1) th light emitting frame starts; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1. Compared with the prior art, the backlight flicker phenomenon can be improved, the scanning frequency is increased, and the power consumption is saved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a driving method of the backlight module and a display device.
Background
A display device provided in the prior art includes a backlight module and a display panel. The display panel does not emit light, and the backlight module is used for supplying sufficient light sources with uniform brightness and distribution to the display panel.
The backlight module can be divided into an edge type backlight module and a direct type backlight module according to the relative position of the light source in the backlight module.
For the direct type backlight module, in the prior art, the driving method is divided into one-to-one and scanning type, and in the driving timing sequence of the scanning type backlight module, the PWM (Pulse width modulation) data needs to be updated before the next frame is displayed, otherwise, the backlight brightness and the display content of the display panel are not corresponding to each other, and abnormal display occurs. During the period of updating the PWM data, all the light sources are in the off state, that is, the scanning of the light sources is suspended, so that a low-frequency component is introduced to the scanning frequency of the light sources, and further the backlight flicker problem is caused, and the longer the backlight scanning suspension time is, the more obvious the flicker phenomenon is.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to improve the flicker phenomenon of the direct-type backlight module.
Disclosure of Invention
In view of the above, the present invention provides a backlight module, a driving method thereof and a display device to solve the problems in the prior art.
In one aspect, the present invention provides a backlight module, including: the scanning driving module is used for driving the light emitting area to emit light; the light emitting region includes: a plurality of control lines, a plurality of signal lines, a plurality of light emitting units; the first pole of the light-emitting unit is electrically connected with the scanning driving module through a control line to receive a scanning signal; the second pole of the light-emitting unit is electrically connected with the data updating module through a signal wire to receive a data signal; the data updating module comprises a first storage unit and a second storage unit which are electrically connected; the working stage of the backlight module comprises a light-emitting stage, wherein the light-emitting stage comprises N light-emitting frames, and one light-emitting frame comprises at least one sub-frame; in a subframe, the scanning driving module sequentially provides scanning signals to a plurality of control lines, and the data updating module provides data signals to the signal lines; before the light-emitting stage, the first storage unit is used for receiving the data signal of the 1 st light-emitting frame and transmitting the data signal to the second storage unit; in an mth light emitting frame, the second storage unit is used for providing the data signals of the mth light emitting frame to the signal line, the first storage unit is used for receiving the data signals of the (m + 1) th light emitting frame, and the first storage unit transmits the data signals of the (m + 1) th light emitting frame to the second storage unit before the (m + 1) th light emitting frame starts; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1.
In another aspect, the present invention provides a driving method of a backlight module, the backlight module includes a light emitting region, and the light emitting region includes: a plurality of control lines, a plurality of signal lines, a plurality of light emitting units; the first pole of the light-emitting unit is electrically connected with the control line, and the second pole of the light-emitting unit is electrically connected with the signal line; the driving method comprises the following steps: controlling the light-emitting stage of the backlight module to comprise N light-emitting frames; wherein in a light emission frame, a scanning signal is sequentially supplied to a plurality of control lines, and a data signal is supplied to a signal line; before the lighting phase, receiving and storing the data signal of the 1 st lighting frame; in the mth lighting frame, providing the data signal of the mth lighting frame to the signal line, receiving the data signal of the (m + 1) th lighting frame and storing the data signal; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1.
In another aspect, the present invention provides a display device, including a backlight module, and a display panel disposed opposite to the backlight module; the backlight module is driven by the driving method provided by the invention.
Compared with the prior art, the backlight module, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
the data updating module is provided with a first storage unit and a second storage unit which are electrically connected, the second storage unit is used for providing data signals of the mth lighting frame to the signal line in the mth lighting frame, the first storage unit is used for receiving the data signals of the (m + 1) th lighting frame, and the first storage unit transmits the data signals of the (m + 1) th lighting frame to the second storage unit before the (m + 1) th lighting frame starts. That is, in the process of the mth light-emitting frame, the backlight module can complete the data update of the (m + 1) th light-emitting frame, so that no additional data update stage is required to be arranged between the mth light-emitting frame and the (m + 1) th light-emitting frame, and compared with the prior art, on one hand, the problem of backlight flicker caused by data update can be solved, and the quality of the backlight module is improved; on the other hand, the scanning frequency of the backlight module can be improved; in another aspect, power consumption of the backlight module is saved.
Of course, it is not necessary for any product in which the present invention is practiced to specifically 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 schematic plan view of a backlight module according to an embodiment of the present invention;
FIG. 2 is a timing diagram of the backlight module shown in FIG. 1;
FIG. 3 is a schematic plan view of another backlight module according to an embodiment of the present invention;
FIG. 4 is a flow chart of a driving method according to an embodiment of the present invention;
FIG. 5 is another timing diagram of the backlight module shown in FIG. 1;
fig. 6 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
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.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention; FIG. 2 is a timing diagram of the backlight module shown in FIG. 1;
the embodiment provides a backlight module, including:
a light emitting area LA, at least one scan driving module 10, at least one data updating module 20;
the light emitting region LA includes: a plurality of control lines CL, a plurality of signal lines DL, a plurality of light emitting cells LU;
the first pole of the light emitting unit LU is electrically connected to the scan driving module 10 through the control line CL to receive the scan signal;
the second pole of the light emitting unit LU is electrically connected to the data updating module 20 through the signal line DL to receive the data signal;
the data update module 20 includes a first memory cell 21 and a second memory cell 22 electrically connected;
the working phase of the backlight module comprises a light-emitting phase TE, wherein the light-emitting phase comprises N light-emitting frames 1frame/m frame/m +1frame, and one light-emitting frame comprises at least one subframe sf; in one sub-frame sf, the scan driving module 10 sequentially supplies scan signals to the plurality of control lines CL, and the data updating module 20 supplies data signals to the signal lines DL;
before the light-emitting period TE, the first storage unit 21 is configured to receive the data signal TD1 of the 1 st light-emitting frame 1frame and transmit the data signal TD1 to the second storage unit 22;
in the mth lighting frame m frame, the second storage unit 22 is configured to provide the data signal TDm of the mth lighting frame to the signal line DL, the first storage unit 21 is configured to receive the data signal TDm +1 of the m +1 th lighting frame m +1frame, and the first storage unit 21 transmits the data signal TDm +1 of the m +1 th lighting frame to the second storage unit 22 before the start of the m +1 th lighting frame; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1.
In the backlight module provided by this embodiment, the light emitting area LA can emit light to provide a surface light source. Specifically, the light emitting area LA is provided with a plurality of light emitting units LU, and the light emitting units LU can emit light. Optionally, the Light Emitting unit LU includes a Light Emitting Diode (LED). Optionally, the light emitting unit LU is a Mini LED or a Micro LED. Mini LED, also known as sub-millimeter light emitting diode, refers to an LED having a die size of between about 100 microns and about 1000 microns. When the Mini LED is used to form the light emitting unit LU provided in the embodiment of the present application, the yield is High, the light emitting unit LU has a special-shaped cutting characteristic, and a backlight form with a High curved surface can be formed by matching with the flexible substrate, so that the light emitting unit LU has better color rendering properties, and when the light emitting unit LU is applied to a display panel, a more precise HDR (High Dynamic Range, High Dynamic Range image) partition can be provided for the display panel. In the embodiment of the present application, a Micro LED may be further selected as the light emitting unit LU, the Micro LED is an LED having a grain size of about 1-10 microns, and can realize a display screen with pixel particles having a size of 0.05 mm or less, and the Micro LED has low power consumption, good material stability and no image residue.
The light emitting area LA further includes a plurality of control lines CL transmitting scan signals to a first pole of the light emitting cells DL, and a plurality of signal lines DL transmitting data signals to a second pole of the light emitting cells LU. The scan signal of each control line CL is provided by the scan driving module 10, and the data signal of each signal line DL is provided by the data updating module 20. In this embodiment, only the scanning signal is taken as a high level signal for illustration, and optionally, the scanning signal may also be a low level signal, which is not repeated in this embodiment. In fig. 2, the schematic data signal and its update phase are filled with rectangles.
The first and second poles of the light emitting unit LU can emit light after receiving suitable electrical signals, and the voltage difference between the scan signal and the data signal can be controlled to control the brightness of the light emitting unit LU. Wherein, different light-emitting units LU can be controlled separately to emit light with different brightness.
The working phase of the backlight module comprises a light-emitting phase TE and a non-light-emitting phase. In the non-light-emitting stage, the backlight module is in a dark state, the first pole and the second pole of each light-emitting unit LU do not receive the electrical signal, and accordingly, each light-emitting unit LU does not emit light; in the light-emitting period TE, the first and second poles of each light-emitting unit LU receive the electrical signal, and each light-emitting unit LU emits light according to the received electrical signal.
When the backlight module is applied to the display device, one light-emitting frame corresponds to the display frame of the display panel one by one, and the time length of one light-emitting frame is approximately the same as that of one display frame. In addition, under an ideal condition, the light-emitting frame and the corresponding display frame are synchronously performed, so that the phenomenon that the light emitted by the backlight module and the display picture of the display panel do not correspond to each other is avoided.
In the light-emitting frame and the corresponding display frame, the brightness of each light-emitting unit LU corresponds to the content displayed by the display panel, before each light-emitting frame starts, the backlight module needs to transmit the data signal of each light-emitting unit LU to the data updating module 20, otherwise, the display abnormality occurs because the backlight brightness does not correspond to the display image of the display panel. During the proceeding of the lighting frame, the data updating module 20 transmits the data signal of each light unit LU to the corresponding light unit LU through the signal line DL in sequence, so that the brightness of each light unit LU corresponds to the content displayed by the display panel.
One light emission frame includes at least one sub-frame sf in which the scan driving module 10 sequentially supplies scan signals to the plurality of control lines CL and the data updating module 20 supplies data signals to the signal lines DL. The number of the control lines CL is a, and a is a positive integer greater than 3. The plurality of control lines are control line CL1, control line CL2, and control line CL3 … …, respectively, control line CLa. In this embodiment, only the control lines CL1, CL2, and CL3 … … are used as the control lines CLa in the order in which the control lines receive the scan signals. It is understood that the plurality of control lines CL can receive the scan signals in various orders, for example, the control lines can receive the scan signals in the order of the control line CLa … …, the control line CL3, the control line CL2 and the control line CL 1. The present embodiment is not particularly limited as to the order in which the control lines receive the scan signals.
In each sub-frame of the same lighting frame, the data signal provided to the signal line DL by the data update module 20 is the same. That is, in the same light emitting frame, the data signals received by the same light emitting unit LU in each sub-frame are the same. In other words, in the same lighting frame, the lighting conditions of the backlight module in each sub-frame are the same.
It should be noted that, in fig. 2, only one light-emitting frame including at least two sub-frames sf is taken as an example for description, it can be understood that the number of sub-frames in one light-emitting frame may be set according to the actual working condition of the backlight module, and this embodiment does not specifically limit this.
In this embodiment, the data update module 20 is provided with a first storage unit 21 and a second storage unit 22 which are electrically connected, and the first storage unit 21 and the second storage unit 22 respectively have a function of storing data signals.
Before the lighting phase TE starts, the backlight module has a data preparation phase, in which the data signal TD1 of the 1 st lighting frame is received and stored. That is, before the light-emitting period TE starts, the first memory unit 21 receives the data signal TD1 of the 1 st light-emitting frame and then transmits the data signal TD1 of the 1 st light-emitting frame to the second memory unit 22, and the first memory unit 21 is in a data-cleared state.
In the backlight module, during the 1 st lighting frame, the second storage unit 22 sequentially supplies the stored data signal TD1 of each lighting unit LU to each lighting unit LU through the signal line DL. Since the first storage unit 21 has emptied data before entering the 1 st lighting frame, the first storage unit can receive the data signal TD2 of the 2 nd lighting frame. In other words, during the proceeding of the 1 st lighting frame, the data update module 20 has updated the data signal TD2 of the 2 nd lighting frame, and no additional data update stage is required between the 1 st and 2 nd lighting frames. Before the backlight module enters the 2 nd lighting frame, the first storage unit 21 transmits the data signal TD2 of the 2 nd lighting frame to the second storage unit 22, so that the backlight module can directly enter the 2 nd lighting frame.
Analogically, in the mth lighting frame, the second storage unit 22 is configured to provide the data signal TDm of the mth lighting frame to the signal line DL, the first storage unit 21 is configured to receive the data signal TD m +1 of the m +1 th lighting frame, and the first storage unit 21 transmits the data signal TD m +1 of the m +1 th lighting frame to the second storage unit 22 before the start of the m +1 th lighting frame; in the m +1 th lighting frame, the first storage unit 21 is configured to receive the data signal TD m +2 of the m +2 th lighting frame; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1. It is understood that the lighting phase includes N lighting frames, and in the nth lighting frame, the backlight module does not need to prepare the data signal of the next frame, and therefore in the nth lighting frame, the second storage unit 22 provides the data signal of the nth lighting frame to the plurality of signal lines DL.
Because an additional data updating stage is not required to be arranged between the mth light-emitting frame and the (m + 1) th light-emitting frame, on one hand, when the time of the light-emitting stage is not changed, the saved data updating time can be used for increasing the number of the light-emitting frames, namely, the scanning frequency of the backlight module can be improved, and the backlight quality is improved; on the other hand, the light-emitting frames of the backlight module are continuously carried out, so that compared with the prior art, the problem of backlight flicker caused by data updating can be solved; in another aspect, when the scanning frequency of the backlight module is not changed, the saved data updating time can be used to increase the scanning time of each row of light-emitting units, i.e. the charging time of the light-emitting units is increased, and accordingly, the driving current of the light-emitting units can be correspondingly reduced, thereby being beneficial to saving the power consumption of the backlight module.
It should be noted that any one of the scan driving module 10 and the data updating module 20 in the backlight module provided in this embodiment may be disposed in the backlight module. Alternatively, any one of the scan driving module 10 and the data updating module 20 may be disposed in a terminal device where the backlight module is located. In this embodiment, for clarity and brief description of the technical solution, the scanning driving module 10 and the data updating module 20 are described as the constituent parts of the backlight module, and specific setting positions of the scanning driving module 10 and the data updating module 20 are not specifically limited.
In the backlight module provided in this embodiment, the data update module 20 is provided with a first storage unit 21 and a second storage unit 22 which are electrically connected, in the mth light-emitting frame, the second storage unit 22 is configured to provide the data signal of the mth light-emitting frame to the signal line DL, the first storage unit 21 is configured to receive the data signal of the m +1 th light-emitting frame, and before the m +1 th light-emitting frame starts, the first storage unit 21 transmits the data signal of the m +1 th light-emitting frame to the second storage unit 22. That is, in the process of the mth light-emitting frame, the backlight module can complete the data update of the (m + 1) th light-emitting frame, so that no additional data update stage is required to be arranged between the mth light-emitting frame and the (m + 1) th light-emitting frame, and compared with the prior art, on one hand, the problem of backlight flicker caused by data update can be solved, and the quality of the backlight module is improved; on the other hand, the scanning frequency of the backlight module can be improved; in another aspect, power consumption of the backlight module is saved.
In some optional embodiments, please refer to fig. 3, fig. 3 is a schematic plan view of another backlight module according to an embodiment of the present invention;
in this embodiment, the number of the data update modules 20 is a, the plurality of signal lines DL are divided into a signal line groups DLG, and each signal line group DLG includes a plurality of signal lines DL;
the data updating module 20 and the signal line group DLG are arranged in a one-to-one correspondence manner, and the data updating module 20 is electrically connected with the signal line group DLG arranged in a corresponding manner; wherein A is a positive integer and is more than or equal to 2.
In the backlight module provided in this embodiment, only by taking a ═ 2 as an example for description, the plurality of signal lines DL are grouped and arranged into 2 signal line groups DLG, and each signal line group DLG has a plurality of signal lines DL, where a specific number of the signal lines DL is designed according to actual conditions of the backlight module, and this embodiment is not particularly limited thereto.
The backlight module is provided with 2 data updating modules 20, the data updating modules 20 and the signal line groups DLG are correspondingly arranged one by one and electrically connected, and the data updating modules 20 provide data signals for the signal line groups DLG correspondingly arranged.
Optionally, the 2 data updating modules 20 are a first data updating module 20a and a second data updating module 20b, respectively, and the working phases of the first data updating module 20a and the second data updating module 20b are synchronous. Specifically, for example, in the mth light emitting frame m frame, the second storage unit 22 of the first data updating module 20a and the second storage unit 22 of the second data updating module 20b simultaneously provide data signals to the corresponding data line groups DLG, and the first storage unit 21 of the first data updating module 20a and the first storage unit 21 of the second data updating module 20b simultaneously receive the data signal TDm +1 of the (m + 1) th light emitting frame m +1 frame.
When the magnitude of signal lines DL in the backlight module is large, the signal lines DL are grouped and the data updating module 20 is correspondingly arranged to provide data signals to the signal line group DLG, so that the number of the data signals required to be stored by the data updating module 20 can be reduced, on one hand, the data updating time can be reduced, and further, the backlight module can complete the data updating of the (m + 1) th light-emitting frame in the mth light-emitting frame proceeding process; on the other hand, the data processing load of the data updating module 20 can be reduced, and the cost of the data updating module can be reduced, thereby reducing the cost of the backlight module.
In fig. 3, only an example in which a is 2 will be described. In other optional embodiments of the present invention, a may be a positive integer of 3, 4, 5, and the like, and a specific value of a is set according to an actual design of the backlight module, which is not limited in this embodiment.
In some alternative embodiments, referring to fig. 1, the plurality of light units LU are arranged in an array along a first direction X and a second direction Y, and the first direction X intersects with the second direction Y.
In the backlight module provided in this embodiment, the plurality of light emitting units LU are arranged in a plurality of rows and columns, and optionally, the first direction X is perpendicular to the second direction Y. For example, the plurality of light units LU are arranged in a row along the first direction X and the plurality of light units LU are arranged in a column along the second direction Y, or the plurality of light units LU are arranged in a row along the second direction Y and the plurality of light units LU are arranged in a column along the first direction X. The plurality of light emitting units LU are arranged in an array, and the arrangement is regular, which is beneficial to simplifying the routing arrangement of the control line CL and the signal line DL.
In other optional implementations of the present invention, the plurality of light emitting units LU may have a plurality of arrangements, and the embodiments of the present invention are not described in detail.
In some alternative embodiments, with continued reference to fig. 1 and fig. 2, the light emitting units LU in the same row along the first direction X are electrically connected to the same control line CL, and the light emitting units LU in the same column along the second direction Y are electrically connected to the same signal line DL.
In this embodiment, the first poles of the light-emitting units LU in the same row along the first direction X receive the same scanning signal at the same time, the second poles of the light-emitting units LU in the same row along the first direction X can receive different data signals, and each light-emitting unit LU emits corresponding light according to the electrical signals of the first and second poles. That is, in the backlight module provided in this embodiment, the plurality of light-emitting units LU emit light row by row. Specifically, for example, the light emitting unit LU in the same row electrically connected to the control line CL1 is the light emitting unit in the 1 st row, the light emitting unit LU in the same row electrically connected to the control line CL2 is the light emitting unit in the 2 nd row, the light emitting unit LU in the same row electrically connected to the control line CL3 is the light emitting unit in the 3 rd row, … …, and the light emitting unit LU in the same row electrically connected to the control line CLa is the light emitting unit in the a-th row. In this embodiment, the row 1 light-emitting unit, the row 2 light-emitting unit, the row 3 light-emitting unit, … …, and the row a light-emitting unit sequentially emit light row by row. Because the time of one sub-frame is short, human eyes cannot recognize that the light-emitting units LU in each row emit light sequentially row by row, and according to the persistence of vision of human eyes, the light-emitting units LU in multiple rows emit light simultaneously visually. It can be understood that the number of the sub-frames in a light-emitting frame is not too small, and the too small number may cause human eyes to recognize the sequence of light emission of each row of light-emitting units, so that the backlight flicker phenomenon occurs. The number of the proper sub-frames is set in one light-emitting frame, so that the flicker phenomenon of the backlight module is favorably improved, and the backlight quality is improved.
The embodiment of the invention also provides a driving method of the backlight module.
Referring to fig. 1, fig. 2 and fig. 4 in combination, fig. 4 is a flowchart of a driving method according to an embodiment of the invention;
in the driving method provided in this embodiment, the backlight module includes a light emitting area LA, and the light emitting area LA includes: a plurality of control lines CL, a plurality of signal lines DL, a plurality of light emitting cells LU;
the first pole of the light emitting unit LU is electrically connected to the control line CL, and the second pole of the light emitting unit LU is electrically connected to the signal line DL;
the driving method comprises the following steps:
controlling the lighting stage TE of the backlight module to comprise N lighting frames 1frame/m frame/m +1 frame; wherein
In one emission frame 1frame/m frame/m +1frame, the scan signal is sequentially supplied to the plurality of control lines CL, and the data signal is supplied to the signal line DL;
before the lighting phase TE, the data signal TD1 of the 1 st lighting frame 1frame is received and stored;
in the mth light emission frame, the data signal TDm of the mth light emission frame m frame is supplied to the signal line DL, and the data signal TDm +1 of the (m + 1) th light emission frame m +1frame is received and stored; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1.
In this embodiment, the Light Emitting area LA of the backlight module includes a plurality of Light Emitting units LU, and the Light Emitting units LU include Light Emitting Diodes (LEDs). Optionally, the light emitting unit LU is a Mini LED or a Micro LED.
The light emitting area LA further includes a plurality of control lines CL and a plurality of signal lines DL, wherein the control lines CL transmit scanning signals to a first pole of the light emitting units DL, the signal lines DL transmit data signals to a second pole of the light emitting units LU, and the first pole and the second pole of the light emitting units LU can emit light after receiving suitable electrical signals.
In the driving method provided by this embodiment, the light-emitting period includes N light-emitting frames, and when the backlight module is applied to the display device, one light-emitting frame corresponds to the display frame of the display panel. Optionally, one light-emitting frame includes at least one subframe sf, which may specifically refer to the foregoing description, and is not described in detail in this embodiment.
Before the lighting phase TE starts, the backlight module has a data preparation phase, in which the data signal TD1 of the 1 st lighting frame is received and stored. The backlight module provides the data signal TD1 of the 1 st light-emitting frame 1frame to the signal line DL during the process of performing the 1 st light-emitting frame, and controls the backlight module to receive and store the data signal TD2 of the 2 nd light-emitting frame 2 frame. By analogy, in the mth lighting frame, the data signal TDm of the mth lighting frame m frame is supplied to the signal line DL, and the data signal TDm +1 of the (m + 1) th lighting frame m +1frame is received and stored.
It is understood that the lighting phase includes N lighting frames, and in the nth lighting frame, the backlight module does not need to prepare the data signal of the next frame, and therefore in the nth lighting frame, the second storage unit 22 provides the data signal of the nth lighting frame to the plurality of signal lines DL.
Because the data signal updating of the (m + 1) th light-emitting frame is finished in the process of the mth light-emitting frame, an additional data updating stage is not required to be arranged between the mth light-emitting frame and the (m + 1) th light-emitting frame, and on one hand, the scanning frequency of the backlight module can be improved; on the other hand, the light-emitting frames of the backlight module are continuously performed, and compared with the prior art, the problem of backlight flicker caused by data updating can be solved.
In some optional embodiments, please continue to refer to fig. 1, fig. 2 and fig. 4, in the present embodiment, in the backlight module, the plurality of light-emitting units LU are arranged in an array along a first direction X and a second direction Y, and the first direction X intersects the second direction Y;
the light emitting units LU in the same row along the first direction X are electrically connected to the same control line CL, and the light emitting units LU in the same column along the second direction Y are electrically connected to the same signal line DL;
the driving method further includes:
in one light emission frame, the scan signals are sequentially supplied to the plurality of control lines CL, and the scan signals of two adjacent control lines CL do not overlap, and the data signal is supplied to the plurality of signal lines DL.
In the driving method provided in this embodiment, the plurality of light emitting units LU are arranged in a plurality of rows and a plurality of columns, and optionally, the first direction X and the second direction Y are perpendicular. The plurality of light emitting units LU are arranged in an array, and the arrangement is regular, which is beneficial to simplifying the routing arrangement of the control line CL and the signal line DL.
In the present embodiment, only one light-emitting frame including at least two sub-frames sf is taken as an example for explanation. In one sub-frame sf, the scan driving module 10 sequentially supplies scan signals to the plurality of control lines CL, and the data updating module 20 supplies data signals to the signal lines DL. In this embodiment, only the control lines CL, the control lines CL1, the control lines CL2, and the control lines CL3 … …, the control lines CLa, are illustrated as an example. Wherein, the scan signals of the two adjacent control lines CL do not overlap, so that the light emitting cells LU controlled by the two adjacent control lines CL receive the data signals, respectively.
Optionally, referring to fig. 5, fig. 5 is another timing diagram of the backlight module shown in fig. 1; fig. 5 illustrates the updating of the data signal only with the m-th light-emitting frame as an example. In fig. 5, only one sub-frame will be described as an example in which the control line CLa receives the scanning signal last. After the last control line CLa receives the scan signal, the data signal of the mth lighting frame is transmitted to the corresponding lighting unit LU, and each lighting unit LU completes its respective lighting task. There is a short delay time sfa after the last control line CLa receives the scan signal, and this delay time sfa can be used to store the data signal TD m +1 of the m +1 th light-emitting frame.
In the driving method provided in this embodiment, the control line CL controls the light-emitting units LU to emit light sequentially row by row. Because the time of one sub-frame is short, human eyes cannot recognize that the light-emitting units LU in each row emit light sequentially row by row, and according to the persistence of vision of human eyes, the light-emitting units LU in multiple rows emit light simultaneously visually.
The invention further provides a display device, which comprises the backlight module provided by any one of the embodiments of the invention, and a display panel arranged opposite to the backlight module.
Specifically, referring to fig. 6, fig. 6 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
The display device provided by the embodiment includes a backlight module 102 and a display panel 101, and optionally, the display panel 101 is a liquid crystal display panel, and includes a first substrate 100, a second substrate 200, and a liquid crystal layer 300 sandwiched between the first substrate 100 and the second substrate 200.
It should be understood that, in this embodiment, only the display panel 101 is taken as an example for description, in other alternative implementations of the present invention, the display panel 101 may be other types of display panels such as an electronic paper display panel, and the description of the embodiment is not repeated.
The invention also provides a display device, which comprises a backlight module and a display panel arranged opposite to the backlight module; the backlight module is driven by the driving method provided by any of the above embodiments of the invention.
The display device provided in this embodiment may be a liquid crystal display device or an electronic paper display device, which is not particularly limited in this embodiment. The structure of the display device provided in this embodiment can refer to fig. 6, and the description of the drawings is omitted in this embodiment.
The display device provided in each embodiment of the present invention may be other display devices with a display function, such as a mobile phone, a computer, a television, a vehicle-mounted display device, and the present invention is not particularly limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the backlight module or the driving method provided in the embodiment of the present invention, and specific reference may be made to the specific description of the above embodiments, which is not repeated herein.
By the embodiment, the backlight module, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:
the data updating module is provided with a first storage unit and a second storage unit which are electrically connected, the second storage unit is used for providing data signals of the mth lighting frame to the signal line in the mth lighting frame, the first storage unit is used for receiving the data signals of the (m + 1) th lighting frame, and the first storage unit transmits the data signals of the (m + 1) th lighting frame to the second storage unit before the (m + 1) th lighting frame starts. That is, in the process of the mth light-emitting frame, the backlight module can complete the data update of the (m + 1) th light-emitting frame, so that an additional data update stage is not required to be arranged between the mth light-emitting frame and the (m + 1) th light-emitting frame, on one hand, the problem of backlight flicker caused by data update can be solved, and the quality of the backlight module is improved; on the other hand, the scanning frequency of the backlight module can be improved; in another aspect, power consumption of the backlight module is saved.
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 (9)
1. A backlight module, comprising:
the scanning driving module is used for driving the light emitting area to emit light;
the light emitting region includes: a plurality of control lines, a plurality of signal lines, a plurality of light emitting units;
the first pole of the light-emitting unit is electrically connected with the scanning driving module through the control line to receive a scanning signal;
the second pole of the light-emitting unit is electrically connected with the data updating module through the signal wire to receive a data signal;
the data updating module comprises a first storage unit and a second storage unit which are electrically connected;
the working phase of the backlight module comprises a light-emitting phase, wherein the light-emitting phase comprises N light-emitting frames, and one light-emitting frame comprises at least one sub-frame; in one subframe, the scanning driving module sequentially supplies scanning signals to the control lines, and the data updating module supplies data signals to the signal lines;
before the light-emitting stage, the first storage unit is used for receiving a data signal of a 1 st light-emitting frame and transmitting the data signal to the second storage unit;
in an mth light emitting frame, the second storage unit is configured to provide the data signal of the mth light emitting frame to the signal line, the first storage unit is configured to receive the data signal of an m +1 th light emitting frame, and the first storage unit transmits the data signal of the m +1 th light emitting frame to the second storage unit before the m +1 th light emitting frame starts; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1.
2. The backlight module according to claim 1,
the number of the data updating modules is A, the signal lines are divided into A signal line groups, and each signal line group comprises a plurality of signal lines;
the data updating module and the signal line group are arranged in a one-to-one correspondence manner, and the data updating module is electrically connected with the signal line group arranged in a corresponding manner; wherein A is a positive integer and is more than or equal to 2.
3. The backlight module according to claim 1,
the plurality of light emitting units are arranged in an array along a first direction and a second direction, and the first direction and the second direction are intersected.
4. The backlight module according to claim 3,
the light-emitting units in the same row along the first direction are electrically connected with the same control line, and the light-emitting units in the same column along the second direction are electrically connected with the same signal line.
5. The backlight module according to claim 1,
the light emitting unit includes a light emitting diode.
6. A driving method of backlight module is characterized in that,
the backlight module comprises a light emitting area, and the light emitting area comprises: a plurality of control lines, a plurality of signal lines, a plurality of light emitting units;
the first pole of the light-emitting unit is electrically connected with the control line, and the second pole of the light-emitting unit is electrically connected with the signal line;
the driving method includes:
controlling the light-emitting stage of the backlight module to comprise N light-emitting frames; wherein
In one light-emitting frame, sequentially supplying scanning signals to the plurality of control lines and supplying data signals to the signal lines;
before the lighting phase, receiving and storing a data signal of a 1 st lighting frame;
in the mth lighting frame, providing the data signal of the mth lighting frame to the signal line, receiving the data signal of the (m + 1) th lighting frame and storing the data signal; wherein N, m is a positive integer, N is more than or equal to 2, and m is more than or equal to 1 and less than or equal to N-1.
7. The driving method according to claim 6,
in the backlight module, the plurality of light-emitting units are arranged in an array along a first direction and a second direction, and the first direction is intersected with the second direction;
the light-emitting units positioned in the same row along the first direction are electrically connected with the same control line, and the light-emitting units positioned in the same column along the second direction are electrically connected with the same signal line;
the driving method further includes:
in one light-emitting frame, scanning signals are sequentially supplied to the plurality of control lines, the scanning signals of two adjacent control lines are not overlapped, and data signals are supplied to the plurality of signal lines.
8. A display device, comprising the backlight module of any one of claims 1-5 and a display panel disposed opposite to the backlight module.
9. A display device is characterized by comprising a backlight module and a display panel arranged opposite to the backlight module; the backlight module is driven by applying the driving method provided by claim 6 or 7.
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| US11847986B2 (en) | 2020-06-22 | 2023-12-19 | Global Technologies Co., Ltd. | Backlight apparatus for display |
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| CN110853586B (en) * | 2019-12-05 | 2021-09-07 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN111554234B (en) * | 2020-05-29 | 2021-07-09 | 上海天马微电子有限公司 | Display module, driving method thereof and display device |
| KR102312357B1 (en) * | 2020-06-22 | 2021-10-13 | 주식회사 글로벌테크놀로지 | Backlight apparatus and current control integrated circuit for display |
| CN111627389B (en) * | 2020-06-30 | 2022-06-17 | 武汉天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN111968586B (en) * | 2020-09-07 | 2022-02-22 | 京东方科技集团股份有限公司 | Backlight source, driving method thereof, storage medium and display panel |
| CN113035139A (en) | 2021-03-19 | 2021-06-25 | Tcl华星光电技术有限公司 | Backlight driving circuit and liquid crystal display device |
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