CN111554234B - Display module, driving method thereof and display device - Google Patents
Display module, driving method thereof and display device Download PDFInfo
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- CN111554234B CN111554234B CN202010478868.8A CN202010478868A CN111554234B CN 111554234 B CN111554234 B CN 111554234B CN 202010478868 A CN202010478868 A CN 202010478868A CN 111554234 B CN111554234 B CN 111554234B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The invention discloses a display module, a driving method thereof and a display device, and relates to the technical field of display. The display module comprises a plurality of light-emitting units, and each light-emitting unit comprises a switch unit and a light-emitting diode unit; a plurality of light emitting regions, any of which includes at least one light emitting unit; the plurality of driving signal lines are used for transmitting pulse width modulation signals to the light-emitting units one by one and controlling the on/off and light-emitting time of the light-emitting units; each light-emitting unit comprises a plurality of sub-frames within one frame scanning time; the driving method comprises the steps of controlling the light emitting time of the light emitting diode unit emitting light in any subframe through a pulse width modulation signal; the display brightness of different light emitting areas under the same display gray scale in one frame scanning time is the same by respectively controlling the number of the sub-frames of the light emitting diode units emitting light in one frame scanning time and combining the light emitting time of the light emitting diode units. The light emitting brightness of the display module under the same display gray scale is more uniform, and the display effect 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
In the prior art, when the number of light emitting elements included in two light emitting areas at different positions in a display panel is different, or the areas of the light emitting areas are different, or the voltage received by the light emitting areas is different, the light emitting luminances of the two light emitting areas are different, so that the light emitting luminance of at least one light emitting area in the display panel viewed by a user is too bright or too dark, that is, the display effect of the display panel is not good. Therefore, it is desirable to provide a driving method of a display module to drive different light emitting areas in a display panel to have the same display brightness at the same display gray level within a frame scanning time.
Disclosure of Invention
In view of this, the present invention provides a display module, a driving method thereof and a display device, so as to solve the problem of uneven brightness of light emitted from a display module due to different brightness of light emitting regions at different positions in a display panel.
In a first aspect, the present application provides a driving method for a display module, where the display module includes:
the light emitting device comprises a plurality of light emitting units, a light emitting unit and a light emitting diode unit, wherein the light emitting units are arranged in an array;
a plurality of light emitting regions, any of the light emitting regions including at least one of the light emitting cells;
each driving signal line is electrically connected with one light-emitting unit and is used for transmitting pulse width modulation signals to the light-emitting units one by one, controlling the on/off of the light-emitting units and controlling the light-emitting time of the light-emitting units;
one frame of scanning time of any one light-emitting unit comprises a plurality of subframes;
the display module comprises a first light-emitting area and a second light-emitting area;
the driving method includes:
controlling the light emitting time of the light emitting diode units emitting light in any subframe through the pulse width modulation signal;
the display brightness of the first light-emitting area and the display brightness of the second light-emitting area under the same display gray scale within the one-frame scanning time are the same by respectively controlling the number of the sub-frames of the light-emitting diode units emitting light within the one-frame scanning time and the light-emitting time of the light-emitting diode units emitting light.
In a second aspect, the present application provides a display module, including:
the light emitting device comprises a plurality of light emitting units, a light emitting unit and a light emitting diode unit, wherein the light emitting units are arranged in an array;
a plurality of light emitting regions, any of the light emitting regions including at least one of the light emitting cells;
each driving signal line is coupled with one light-emitting unit and is used for transmitting pulse width modulation signals to the light-emitting units one by one, controlling the on/off of the light-emitting units and controlling the light-emitting time of the light-emitting units;
the display module comprises a first light-emitting area and a second light-emitting area, and the display brightness of the first light-emitting area and the display brightness of the second light-emitting area are the same under the same display gray scale in one frame scanning time.
In a third aspect, the present application provides a display device, which includes the display module.
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 application provides a driving method of a display module, which enables the display brightness of different light-emitting areas under the same display gray scale in one frame scanning time to be the same by respectively controlling the number of sub-frames of the light-emitting diode units emitting light in one frame scanning time and controlling the light-emitting time of the light-emitting diode units emitting light in any sub-frame through a pulse width modulation signal; the light emitting brightness of the display module under the same display gray scale is more uniform, and the display effect of the display module is guaranteed.
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 schematic view of a display module according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a driving method of a display module according to an embodiment of the present disclosure;
fig. 3 is another flowchart illustrating a driving method of a display module according to an embodiment of the present disclosure;
fig. 4 is a timing diagram illustrating driving of led units in different light-emitting areas according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a driving method of a display module according to an embodiment of the present disclosure;
fig. 6 is a timing diagram illustrating another driving of led units in different light-emitting areas according to an embodiment of the present disclosure;
fig. 7 is an enlarged view of a light-emitting unit in a display module according to an embodiment of the present disclosure;
fig. 8 is another enlarged view of a light-emitting unit in a display module according to an embodiment of the disclosure;
fig. 9 is a schematic view of a display device 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.
When the number of the light emitting elements included in the two light emitting areas at different positions in the display panel is different, or the areas of the light emitting areas are different, or the voltage received by the light emitting areas is different, the light emitting luminance of the two light emitting areas is different, so that the light emitting luminance of at least one light emitting area in the display panel viewed by a user is too bright or too dark, that is, the display effect of the display panel is not good. Therefore, it is desirable to provide a driving method of a display module to drive different light emitting areas in a display panel to have the same display brightness at the same display gray level within a frame scanning time.
In view of this, the present invention provides a display module, a driving method thereof and a display device, so as to solve the problem of uneven brightness of light emitted from a display module due to different brightness of light emitting regions at different positions in a display panel.
Fig. 1 is a schematic view of a display module provided in an embodiment of the present disclosure, and fig. 2 is a flowchart of a driving method of the display module provided in the embodiment of the present disclosure; referring to fig. 1 and 2, the present application provides a driving method of a display module, in which the display module 100 includes:
the light emitting device comprises a plurality of light emitting units 3, wherein the light emitting units 3 are arranged in an array, and any light emitting unit 3 comprises at least one switch unit 4 and one light emitting diode unit 5;
a plurality of light emitting regions, any of which includes at least one light emitting unit 3;
a plurality of driving signal lines 6, each driving signal line 6 electrically connected to one light emitting unit 3 for transmitting pulse width modulation signals to the light emitting units 3 one by one, controlling on/off of the light emitting units 3, and controlling light emitting time of the light emitting units 3;
one frame scanning time of any light-emitting unit 3 comprises a plurality of subframes;
the display module 100 includes a first light emitting region 11 and a second light emitting region 12;
the driving method comprises the following steps:
Specifically, the application provides a driving method of a display module, and the display module 100 used in the driving method includes a display area 1 and a non-display area 2, wherein the non-display area 2 is arranged around the display area 1; the display module 100 comprises a plurality of light-emitting units 3, the light-emitting units 3 are arranged in the display area 1 in an array manner, and any light-emitting unit 3 at least comprises a switch unit 4 and a light-emitting diode unit 5; the display module 100 further includes a plurality of light emitting areas, and any light emitting area may include a plurality of light emitting units 3, and the size of the light emitting unit 3 included in any light emitting area is not particularly limited in the present application, for example, one light emitting area may include one light emitting unit 3, or one light emitting area may include four light emitting units 3. The display module 100 further includes a plurality of driving signal lines 6, each of the light emitting units 3 is electrically connected to the driving chip IC in the non-display area 2 through one of the driving signal lines 6, and the driving signal lines 6 are used for transmitting pulse width modulation signals to the light emitting units 3 one by one, so as to control the on/off of the light emitting units 3 and control the light emitting time of the light emitting units 3.
In the display module 100 provided in the present application, a frame scanning time of any light emitting unit 3 includes a plurality of subframes, but the present application does not limit the number of subframes included in a frame scanning time of any light emitting unit 3, for example, a frame scanning time may include 4 subframes, or a frame scanning time may include 100 subframes; that is, the number of subframes included in one frame of scanning time can be adjusted accordingly according to the requirement.
The driving method of the display module includes, in step 101, controlling the light emitting time of any light emitting diode unit 5 in a subframe through the pwm signals transmitted by different driving signal lines 6, where the control of the light emitting time can be used to adjust the light emitting brightness of each light emitting unit 3 in a frame scanning time. Further, in step 102, the number of sub-frames of light emitted by the led units 5 within one frame of scanning time is controlled respectively, and the light emitting time of the led units 5 emitting light is controlled in step 101, so as to adjust the display brightness of different light emitting areas (for example, the display module 100 may include the first light emitting area 11 and the second light emitting area 12) to be the same at the same display gray scale within one frame of scanning time. In step 102, the number of the sub-frames that emit light within one frame scanning time of each light-emitting unit 3 is controlled, which can be used to control the display gray scale and the light-emitting brightness of the light-emitting unit 3. When the number of the light emitting diode units 5 included in the two light emitting areas is different, for example, the number of the light emitting diode units 5 included in the first light emitting area 11 is smaller than the number of the light emitting diode units 5 included in the second light emitting area 12, in the prior art, when the first light emitting area 11 and the second light emitting area 12 emit light simultaneously, the overall brightness of the second light emitting area 12 including a larger number of light emitting diode units is higher, and the overall brightness of the first light emitting area 11 including a smaller number of light emitting diode units is lower in the same display gray scale within one frame scanning time, and a certain brightness difference appears between the two light emitting areas, which affects the visual experience of the user. In the present application, by respectively controlling the number of the sub-frames of the light emitting diode units 5 in the first light emitting area 11 and the second light emitting area 12 within one frame scanning time and controlling the light emitting time of the light emitting diode units 5 in any sub-frame by the pulse width modulation signal, the display luminance of different light emitting areas (the first light emitting area 11 and the second light emitting area 12) under the same display gray scale within one frame scanning time is the same, so that the luminance difference between different light emitting areas is avoided, and the display effect of the display module 100 is improved.
It should be noted that the Pulse Width Modulation (PWM) in step 101 is divided into several time slices within one frame scanning time, for example, 64 time slices for 64 gray scales, and if 5/64 gray scales need to be displayed, the driving voltage is only used to make the light-emitting unit 3 emit light during 5/64 time. In step 102, "the number of subframes in which the led unit 5 emits light within one Frame scanning time" is Frame Rate Control (FRC), and 64 subframes are required for changing each time slice into one subframe and displaying 64-level gray scale; in order to realize frame frequency control, a frame is divided into a plurality of sub-frames, and finally, the brightness sensed by human eyes is the accumulation of the brightness of all the sub-frames due to the visual effect of the human eyes.
That is, in the driving method provided by the present application, the display brightness of different light emitting areas under the same display gray scale within one frame scanning time is the same by respectively controlling the number of the sub-frames of the light emitting diode unit 5 emitting light within one frame scanning time and controlling the light emitting time of the light emitting diode unit 5 emitting light within any one sub-frame by the pulse width modulation signal; the brightness of the light emitted by the display module 100 under the same display gray scale is improved to be more uniform, and the display effect of the display module 100 is guaranteed.
It should be noted that fig. 1 is only a schematic diagram for clearly illustrating a display module provided in the present disclosure, and does not represent an actual structure of the display module; that is, this application does not restrict the outward appearance of display module assembly, the arrangement and the mode of setting up of inside pixel unit and circuit, components and parts etc. and the structure of actual display module assembly can be carried out corresponding adjustment by technical staff according to the demand.
Fig. 3 is another flowchart of a driving method of a display module according to an embodiment of the present disclosure, and fig. 4 is a timing chart of driving light emitting diode units in different light emitting areas according to the embodiment of the present disclosure, please refer to fig. 1, fig. 3, and fig. 4, where optionally, the number of the light emitting units 3 included in the first light emitting area 11 is smaller than the number of the light emitting units 3 included in the second light emitting area 12;
the driving method comprises the following steps:
Specifically, the present application provides a case that at least two different light emitting regions of the display module 100 emit light simultaneously, for example, as shown in fig. 1, where the number of the light emitting units 3 included in the first light emitting region 11 and the second light emitting region 12 is different, specifically, the number of the light emitting units 3 included in the first light emitting region 11 is smaller than the number of the light emitting units 3 included in the second light emitting region 12, as shown in fig. 1, the first light emitting region 11 may include only one light emitting unit 3, and the second light emitting region 12 includes four light emitting units 3 arranged in a matrix; that is, when the frame rate control and the pulse width modulation are not performed on the light emitting units 3 of the first light emitting area 11 and the second light emitting area 12, under the same display screen, since the brightness of the light emitted by the light emitting units 3 in the second light emitting area 12 is enhanced, the problem that the luminance of the light emitted from the second light emitting area 12 is higher than that of the light emitted from the first light emitting area 11 occurs, that is, the problem that the luminance of the whole display module is not uniform occurs. For example, the first light-emitting region 11 emits light with luminance of 400nit, whereas the second light-emitting region 12 emits light with luminance of 1600 nit.
Therefore, the driving method of the display module further includes step 1011: when modulation signals with different pulse widths are transmitted to the light-emitting units 3 emitting light through the plurality of driving signal lines 6 during one frame scanning time, the light-emitting time T1 of the light-emitting diode units 5 in the first light-emitting region 11 can be controlled to be longer than the light-emitting time T2 of the light-emitting diode units 5 in the second light-emitting region 12, as shown in fig. 4, the PWM is at a high level for controlling the turn-on of the corresponding light-emitting diode units 5, the width of the high level corresponds to the pulse width of the PWM for controlling the light-emitting time of the corresponding light-emitting diode units 5; since the light emission luminance sensed by the human eye becomes stronger as the light emission time of the same light-emitting unit 3 becomes longer within one frame scanning time due to persistence of vision of the human eye, the problem of light emission unevenness of the display panel can be weakened to some extent by adjusting the light emission time T1 of the light-emitting region (first light-emitting region 11) including the small number of light-emitting units 3 to be longer than the light emission time T2 of the light-emitting region (second light-emitting region 12) including the large number of light-emitting units 3.
It should be noted that "11 PWM" shown in fig. 4 is a pulse width modulation signal received by the first light-emitting area 11, and "12 PWM" is a pulse width modulation signal received by the second light-emitting area 12. The first subframe, the second subframe, the third subframe, … …, and the nth subframe are labeled in fig. 4, where N is a positive integer greater than 1. That is, the present application divides one frame scanning time into N subframes, for example, when the "nth subframe" shown in fig. 4 is the fourth subframe, the present application divides one frame scanning time into 4 subframes.
A better way to eliminate the display module 100 light-emitting unevenness is to control the number of sub-frames of the led units 5 emitting light within a frame scanning time and to control the light-emitting time of the led units 5 emitting light within any sub-frame by the pwm signal, that is, to make the display brightness of different light-emitting areas in the same display gray scale within a frame scanning time the same by the pwm and the frame frequency control, so as to eliminate the display brightness unevenness problem of the display module 100.
With reference to fig. 1, fig. 3 and fig. 4, optionally, the driving method further includes step 1012, controlling the lighting time T2 of the led units 5 in the second lighting area 12 to be within the lighting time T1 of the led units 5 in the first lighting area 11.
Specifically, in order to eliminate the difference of the light emitting brightness of the light emitting regions with different numbers of light emitting units 3 in one frame display time, the present application controls the light emitting time T1 of the light emitting diode unit 5 in the first light emitting region 11 to be longer than the light emitting time T2 of the light emitting diode unit 5 in the second light emitting region 12; in addition, the present application further provides a driving method for controlling the light emission of different light emitting areas, which includes step 1012: controlling the light emitting time T2 of the light emitting diode unit 5 in the second light emitting region 12 to be within the light emitting time T1 of the light emitting diode unit 5 in the first light emitting region 11, as shown in FIG. 4; that is, in each subframe, although the light-emitting time T2 of the light-emitting unit 3 in the second light-emitting region 12 is short, the light-emitting time T2 of all the light-emitting diode units 5 in the second light-emitting region 12 needs to be adjusted to coincide with the light-emitting time T1 of the light-emitting diode units 5 in the first light-emitting region 11, so that there is no interval time between the light-emitting time T2 of the second light-emitting region 12 and the light-emitting time T1 of the first light-emitting region 11, which is beneficial to avoiding the phenomenon that the display module 100 slightly flickers within the same frame display time; specifically, referring to fig. 4, the phase (corresponding to the emitting time T2) of the second light-emitting region 12 receiving the PWM high-level signal is within the phase (corresponding to the emitting time T1) of the first light-emitting region 11 receiving the PWM high-level signal. That is, the light-emitting time T2 of the light-emitting diode unit 5 in the second light-emitting region 12 is within the light-emitting time T1 of the light-emitting diode unit 5 in the first light-emitting region 11, which is beneficial to the stability of the display screen of the display module 100 and the protection of the eyes of the user.
Fig. 5 is another flowchart of a driving method of a display module according to an embodiment of the present disclosure, and fig. 6 is another timing diagram of driving led units in different light-emitting areas according to an embodiment of the present disclosure, and referring to fig. 1, fig. 5, and fig. 6, optionally, the second light-emitting area 12 includes a first sub-light-emitting area 121, a second sub-light-emitting area 122, a third sub-light-emitting area 123, and a fourth sub-light-emitting area 124, which have the same shape and area, the first sub-light-emitting area 121 and the third sub-light-emitting area 123 are diagonally disposed, and the second sub-light-emitting area 122 and the fourth sub-light-emitting area 124 are diagonally disposed; the shape and area of the first sub-light-emitting region 121 are the same as those of the first light-emitting region 11;
the driving method further includes:
Specifically, referring to fig. 1, the present application provides an embodiment as follows: the second light-emitting region 12 includes a first sub-light-emitting region 121, a second sub-light-emitting region 122, a third sub-light-emitting region 123 and a fourth sub-light-emitting region 124, which have the same shape and area, wherein the four sub-light-emitting regions of the second light-emitting region 12 are arranged in a matrix, wherein the first sub-light-emitting region 121 and the third sub-light-emitting region 123 are diagonally arranged, the second sub-light-emitting region 122 and the fourth sub-light-emitting region 124 are diagonally arranged, and the shape and area of the first light-emitting region 11 are the same as those of any sub-light-emitting region in the second light-emitting region 12, as shown; that is, one second light-emitting region 12 may be equivalently constituted by four first light-emitting regions 11.
It should be noted that "11 PWM" shown in fig. 6 is a pulse width modulation signal received by the first light-emitting area 11, "121 PWM" is a pulse width modulation signal received by the first sub-light-emitting area 121, "122 PWM" is a pulse width modulation signal received by the second sub-light-emitting area 122, "123 PWM" is a pulse width modulation signal received by the third sub-light-emitting area 123, and "124 PWM" is a pulse width modulation signal received by the fourth sub-light-emitting area 124. T21 shown in fig. 6 is the light emitting time of the first sub-light emitting area 121, corresponding to the pulse width of the PWM received by the first sub-light emitting area 121; t22 is the light emitting time of the second sub-light emitting region 122, corresponding to the pulse width of the PWM received by the second sub-light emitting region 122; t23 is the light emitting time of the third sub-light emitting area 123, corresponding to the pulse width of the PWM received by the third sub-light emitting area 123; t24 is the light emitting time of the fourth sub-light emitting area 124, corresponding to the pulse width of the PWM received by the fourth sub-light emitting area 124. The first subframe, the second subframe, the third subframe, … …, and the nth subframe are labeled in fig. 6, where N is a positive integer greater than 1. That is, the present application divides one frame scanning time into N subframes, for example, when the "nth subframe" shown in fig. 6 is the fourth subframe, the present application divides one frame scanning time into 4 subframes.
The driving method of the display module further includes a step 1013: controlling the light emitting diode units 5 in the first sub-light-emitting area 121 and the third sub-light-emitting area 123 to emit light in a time-sharing manner with the light emitting diode units 5 in the second sub-light-emitting area 122 and the fourth sub-light-emitting area 124 during one frame scanning time; specifically, the light-emitting units 3 at diagonal positions in the second light-emitting region 12 are controlled to emit light in a time-sharing manner, and on the basis, the light-emitting time (T21/T22/T23/T24) of the light-emitting diode unit 5 of any sub-light-emitting region in the second light-emitting region 12 is controlled to be within the light-emitting time T1 of the light-emitting diode unit 5 in the first light-emitting region 11; as shown in fig. 6, the phases (corresponding to the lighting times T21/T22/T23/T24) of receiving the PWM high level signal in any sub-lighting region 121/122/123/124 of the second lighting region 12 are all within the phase (corresponding to the lighting time T1) of receiving the PWM high level signal in the first lighting region 11, but the phases (corresponding to the lighting times T21 and T23) of receiving the PWM high level signal in the first and third sub-lighting regions 121 and 123 do not overlap with the phases (corresponding to the lighting times T22 and T24) of receiving the PWM high level signal in the second and fourth sub-lighting regions 122 and 124.
The light-emitting units 3 in the second light-emitting area 12 provided by the application adopt a diagonal lighting mode, so that the brightness of the light emitted by the second light-emitting area 12 is balanced, and the situation that the display picture of the second light-emitting area 12 is too bright or too dark compared with the display picture of the first light-emitting area 11 in one frame of scanning time is avoided, thereby being beneficial to ensuring that the display brightness of the second light-emitting area 12 and the display brightness of the first light-emitting area 11 in the same display gray scale in one frame of scanning time are the same, and further being beneficial to eliminating the problem of uneven display brightness of the display module 100.
With reference to fig. 1, fig. 5 and fig. 6, optionally, the driving method further includes a step 1014 of controlling the light emitting diode unit 5 in the first sub-light-emitting area 121 and the light emitting diode unit 5 in the third sub-light-emitting area 123 to emit light simultaneously, and controlling the light emitting diode unit 5 in the second sub-light-emitting area 122 and the light emitting diode unit 5 in the fourth sub-light-emitting area 124 to emit light simultaneously.
Specifically, when the sub-light emitting regions in the second light emitting region 12 are arranged to emit light diagonally, the driving method of the display module 100 provided by the present application may further control the light emitting diode units 5 in the diagonally arranged sub-light emitting regions to emit light simultaneously, and the light emitting time of the light emitting diode units 5 in the diagonally arranged sub-light emitting regions is the same; in conjunction with the second light-emitting region 12 shown in fig. 1 of the present application, step 1014 is specifically: the light emitting diode unit 5 in the first sub-light-emitting area 121 and the light emitting diode unit 5 in the third sub-light-emitting area 123 are controlled to emit light simultaneously, and the light emitting diode unit 5 in the second sub-light-emitting area 122 and the light emitting diode unit 5 in the fourth sub-light-emitting area 124 are controlled to emit light simultaneously. Referring to fig. 6, the phases (corresponding to the emitting time T21/T22/T23/T24) of receiving the PWM high level signal by any one of the sub-emitting regions 121/122/123/124 in the second emitting region 12 are all located in the phase (corresponding to the emitting time T1) of receiving the PWM high level signal by the first emitting region 11, the phases (corresponding to the emitting time T21/T23) of receiving the PWM high level signal by the first sub-emitting region 121 and the third sub-emitting region 123 are the same, the phases (corresponding to the emitting time T22/T24) of receiving the PWM high level signal by the second sub-emitting region 122 and the fourth sub-emitting region 124 are the same, and the phases (corresponding to the lighting times T21/T23) of the first and third sub-luminescent regions 121 and 123 receiving the PWM high signal do not coincide with the phases (corresponding to the lighting times T22/T24) of the second and fourth sub-luminescent regions 122 and 124 receiving the PWM high signal. That is, the pulse width modulation signals received by the light emitting units 3 in the two diagonally arranged sub-light emitting areas and the number of sub-frames emitting light within one frame scanning time are the same, which is beneficial to conveniently control the display of the sub-light emitting areas in the second light emitting area 12.
In addition, the light emitting units 3 in the second light emitting region 12 provided by the present application are diagonally lit, so that the brightness of the light emitted from the second light emitting region 12 is balanced, and at the same time, the situation that the display image of the second light emitting region 12 is too bright or too dark in comparison with the display image of the first light emitting region 11 within one frame of scanning time does not occur, which is beneficial to making the display brightness of the second light emitting region 12 and the display brightness of the first light emitting region 11 within the same display gray scale within one frame of scanning time the same, and further beneficial to eliminating the problem of the display module 100 that the display brightness is uneven.
Referring to fig. 1, based on the same inventive concept, the present application further provides a display module 100, including:
the light emitting device comprises a plurality of light emitting units 3, wherein the light emitting units 3 are arranged in an array, and any light emitting unit 3 comprises at least one switch unit 4 and one light emitting diode unit 5;
a plurality of light emitting regions, any of which includes at least one light emitting unit 3;
a plurality of driving signal lines 6, each driving signal line 6 being coupled to one light emitting unit 3, for transmitting pulse width modulation signals to the light emitting units 3 one by one, controlling on/off of the light emitting units 3, and controlling light emitting time of the light emitting units 3;
the display module 100 includes a first light-emitting area 11 and a second light-emitting area 12, and the display luminance of the first light-emitting area 11 and the display luminance of the second light-emitting area 12 are the same at the same display gray level within one frame scanning time.
Specifically, based on the driving method of the display module provided above, the present application also provides a display module 100, and the driving method of the display module can be used for the display module 100. The display module 100 provided by the application comprises a display area 1 and a non-display area 2, wherein the non-display area 2 is arranged around the display area 1; the display region 1 includes a plurality of light emitting units 3 arranged in an array, wherein any one of the light emitting units 3 includes at least one switch unit 4 and one light emitting diode unit 5; the display module 100 further includes a plurality of light emitting areas, and any light emitting area may include a plurality of light emitting units 3, and the size of the light emitting unit 3 included in any light emitting area is not specifically limited in the present application, for example, as shown in fig. 1, one light emitting area may include one light emitting unit 3, or one light emitting area may include four light emitting units 3. The display module 100 further includes a plurality of driving signal lines 6, each of the light emitting units 3 is electrically connected to the driving chip IC in the non-display area 2 through one of the driving signal lines 6, and the driving signal lines 6 are used for transmitting pulse width modulation signals to the light emitting units 3 one by one, so as to control the on/off of the light emitting units 3 and control the length of light emitting time of the light emitting units 3.
In the display module 100 provided in the present application, any light emitting unit 3 includes a plurality of sub-frames within one frame scanning time, but the present application does not limit the number of sub-frames included within one frame scanning time of any light emitting unit 3, for example, a frame scanning time may include 4 sub-frames, or a frame scanning time may include 100 sub-frames; that is, the number of subframes included in one frame of scanning time can be adjusted accordingly according to the requirement.
The display module 100 provided by the present application can include different light emitting regions in the display process, for example, the display module includes a first light emitting region 11 and a second light emitting region 12, and the display luminance of the different light emitting regions (for example, the first light emitting region 11 and the second light emitting region 12) in the same display gray scale within one frame scanning time can be adjusted to be the same by the driving method of the display module 100, regardless of whether the number of the light emitting units 3 included in the first light emitting region 11 and the second light emitting region 12 is the same, and regardless of the distance between the first light emitting region 11 and the second light emitting region 12 in the display module 100; the brightness of the light emitted by the display module 100 under the same display gray scale is improved to be more uniform, and the display effect of the display module 100 is guaranteed.
Fig. 7 is an enlarged view of a light emitting unit in a display module according to an embodiment of the present disclosure, and fig. 8 is another enlarged view of a light emitting unit in a display module according to an embodiment of the present disclosure, please refer to fig. 1, 7 and 8, where optionally, any one of the light emitting diode units 5 at least includes one light emitting diode 51 connected in series with the switch unit 4.
Specifically, the light emitting diode unit 5 included in any light emitting unit 3 in the display area 1 includes at least one light emitting diode 51, the light emitting diodes 51 in any light emitting unit 3 are all connected in series with the switch unit 4, that is, the light emitting diodes 51 in the light emitting unit 3 are connected in series to form the light emitting diode unit 5, and then one end of the light emitting diode unit 5 is electrically connected with the switch unit 4, and is used for receiving the voltage signal transmitted by the switch unit 4, further controlling the on/off of the light emitting diode unit 5, and controlling the light emitting time width of the light emitting diode unit 5 within one frame of scanning time. Optionally, the switch unit 4 of each light emitting unit 3 is connected in series with one light emitting diode 51, or the switch unit 4 is connected in series with two light emitting diodes 51. As shown in fig. 7, one switching unit 4 is connected in series with one light emitting diode 51, and as shown in fig. 8, one switching unit 4 is connected in series with two light emitting diodes 51.
Optionally, the light emitting diode 51 comprises a Mini LED or a Micro LED. That is, the light emitting element in any one of the light emitting units 3 in the display module 100 provided by the present application is a Mini LED or a Micro LED, wherein the Mini LED has the advantage of saving energy consumption in the using process, which is beneficial to improving the service life of the corresponding display module 100, and the Mini LED is thinner, which is beneficial to the thin design requirement of the corresponding display module 100, and the Mini LED also has the advantage of being easier to produce in batches, which is beneficial to improving the production efficiency of the display module 100. The Micro LED has the advantages of miniaturization and thinning, and also has the advantages of simple structure, short response time and the like. That is, the light emitting elements of the light emitting unit 3 of the present application adopt Mini LED or Micro LED, which is favorable for the thin design requirement of the display module 100, and the number of the light emitting elements in the display module 100 in the same area is more, the arrangement is more intensive, which is favorable for improving the resolution of the display module 100, and is favorable for improving the display effect of the display module 100.
With reference to fig. 1, fig. 7 and fig. 8, optionally, the display module 100 further includes: a first power signal terminal PVDD and a second power signal terminal PVEE, wherein a first terminal 52 of any one of the light emitting diode units 5 is electrically connected with the first power signal terminal PVDD, a second terminal 53 of any one of the light emitting diode units 5 is electrically connected with a first terminal 54 of the corresponding switch unit 4, and a second terminal 55 of any one of the switch units 4 is electrically connected with the second power signal terminal PVEE; the control terminal 56 of any one of the switch units 4 is electrically connected to one of the drive signal lines 6.
Specifically, the display module 100 further includes a first power signal terminal PVDD and a second power signal terminal PVEE, the first end 52 of the led unit 5 in any one of the light emitting units 3 is electrically connected to the first power signal terminal PVDD, the second end 53 of the led unit 5 in any one of the light emitting units 3 is electrically connected to the first end 54 of the corresponding switch unit 4, the second end 55 of any one of the switch units 4 is electrically connected to the second power signal terminal PVEE, and the control end 56 of any one of the switch units 4 is electrically connected to different driving signal lines 6. The first power signal terminal PVDD is configured to provide a voltage signal to the first terminal 52 of the led unit 5, and form a voltage difference with the voltage signal received by the second terminal of the led unit 5, so as to drive the led unit 5 to conduct. The driving signal lines 6 are used for transmitting pulse width modulation signals to the light emitting units 3 one by one, so as to control the on and off of the light emitting units 3, and also control the light emitting time of the light emitting units 3.
The display brightness of different light-emitting areas under the same display gray scale in one frame scanning time is the same by respectively controlling the number of the sub-frames which are emitted by the light-emitting diode units 5 in one frame scanning time and controlling the light-emitting time of the light-emitting diode units 5 which emit light in any sub-frame through the pulse width modulation signal; the brightness of the light emitted by the display module 100 under the same display gray scale is improved to be more uniform, and the display effect of the display module 100 is guaranteed.
With continued reference to fig. 1 and 7, optionally, any one of the switch units 4 includes a field effect transistor 30, a gate of the field effect transistor 30 is used as a control terminal 56 of the switch unit 4, a first pole is used as a first terminal 54 of the switch unit 4, and a second pole is used as a second terminal 55 of the switch unit 4.
Specifically, the field effect transistor 30 may be selected as the switching unit 4 in the display module 100 provided by the present application, and specifically, the gate of the field effect transistor 30 is used as the control terminal 56 of the switching unit 4, the first pole of the field effect transistor 30 is used as the first terminal 54 of the switching unit 4, and the second pole of the field effect transistor 30 is used as the second terminal 55 of the switching unit 4. The gate of the field effect transistor 30 is electrically connected to one of the driving signal lines 6, the first pole of the field effect transistor 30 is electrically connected to the second terminal 53 of the light emitting diode unit 5, and the second pole of the field effect transistor 30 is electrically connected to the second power signal terminal PVEE.
With reference to fig. 1 and fig. 7, optionally, the display module 100 further includes: a current limiting resistor 7, wherein the current limiting resistor 7 is disposed between the second end 55 of any one of the switch units 4 and the second power signal terminal PVEE.
Specifically, when the field effect transistor 30 is selected for use as the switch unit 4 in the display module 100 provided by the present application, in order to avoid the risk that the circuit is burned out in the display process of the display module 100, the current limiting resistor 7 is additionally arranged between the second end 55 of any switch unit 4 in the display module 100 and the second power signal terminal PVEE, so as to protect the circuit from being broken down, which is beneficial to improving the yield of the display module 100 and the service life of the display module 100.
It should be noted that the current limiting resistor 7 additionally disposed between the second end 55 of any switch unit 4 and the second power signal terminal PVEE can be replaced by a trace resistor, for example, the trace between the second end 55 of the switch unit 4 and the second power signal terminal PVEE can be formed by thickening or increasing the trace between the second end 55 of the switch unit 4 and the second power signal terminal PVEE, that is, the trace between the second end 55 of the switch unit 4 and the second power signal terminal PVEE and the additionally disposed current limiting resistor 7 can be made of the same material and supported in the same process, which is beneficial to simplifying the manufacturing process of the display module 100 and improving the yield of the display module 100.
Referring to fig. 1 and 8, optionally, each of the switch units 4 includes a first thin film transistor 31 and a second thin film transistor 32, gates of the first thin film transistor 31 and the second thin film transistor 32 are electrically connected to the driving signal line 6, and the first thin film transistor 31 and the second thin film transistor 32 are turned on or turned off simultaneously; the first and second thin film transistors 31 and 32 have first poles as the first terminal 54 of the switching unit 4 and second poles as the second terminal 55 of the switching unit 4.
Specifically, the switching unit 4 in any one of the light emitting units 3 provided in the present application may be formed by two TFTs (Thin Film transistors) connected in parallel, in addition to the above-described field effect Transistor 30; that is, any one of the switch units 4 includes a first thin film transistor 31 and a second thin film transistor 32, wherein the gates of the first thin film transistor 31 and the second thin film transistor 32 are electrically connected to the driving signal line 6, and the pulse width modulation signal transmitted by the driving signal line 6 is used for controlling the first thin film transistor 31 and the second thin film transistor 32 to be turned on or off simultaneously and also used for controlling the time width of turning on the first thin film transistor 31 and the second thin film transistor 32. First poles of the first thin film transistor 31 and the second thin film transistor 32 are both used as a first terminal 54 of the switch unit 4, and second poles of the first thin film transistor 31 and the second thin film transistor 32 are both used as a second terminal 55 of the switch unit 4, that is, the first poles of the first thin film transistor 31 and the second thin film transistor 32 are both electrically connected to the second power signal terminal PVEE, and the second poles of the first thin film transistor 31 and the second thin film transistor 32 are both electrically connected to the second terminal 53 of the light emitting diode unit 5.
The display brightness of different light-emitting areas under the same display gray scale in one frame scanning time is the same by respectively controlling the number of the sub-frames which are emitted by the light-emitting diode units 5 in one frame scanning time and controlling the light-emitting time of the light-emitting diode units 5 which emit light in any sub-frame through the pulse width modulation signal; the brightness of the light emitted by the display module 100 under the same display gray scale is improved to be more uniform, and the display effect of the display module 100 is guaranteed.
Fig. 9 is a schematic view of a display device according to an embodiment of the present application, please refer to fig. 1 to 9, and based on the same inventive concept, the present application further provides a display device 200, where the display device 200 includes a display module 100, and the display module 100 is any one of the display modules 100 provided in the present application.
It should be noted that, in the embodiment of the display device 200 provided in the present application, reference may be made to the above-mentioned embodiment of the display module 100, and repeated descriptions are omitted. The display device 200 provided by the present application may be: any product and component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a vehicle-mounted display screen, a navigator and the like.
The driving module of the display module 100 includes a display data input module, a data storage module, and an FRC + PWM adjusting module; wherein, the display data can include the time width of the light emitting of any light emitting unit 3, the stage of the light emitting, the number of the sub-frames of the light emitting within the scanning time of one frame, etc., the display data can be adjusted correspondingly by the technical staff, the data storage module is used for temporarily storing the input display data and transmitting the display data to the FRC + PWM adjusting module, to control the lighting time of the led unit 5 in any lighting unit 3 in a subframe, and further by separately controlling the number of sub-frames of the light emitting diode units 5 emitting light within one frame scanning time, in combination with the light emitting time of the light emitting diode units 5, therefore, the display brightness of different light emitting areas in the display module 100 (for example, the display module 100 may include the first light emitting area 11 and the second light emitting area 12) may be controlled to be the same in the same display gray scale within one frame scanning time. The brightness of the light emitted by the display module 100 under the same display gray scale is improved to be more uniform, and the display effect of the display module 100 is guaranteed.
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 application provides a driving method of a display module, which enables the display brightness of different light-emitting areas under the same display gray scale in one frame scanning time to be the same by respectively controlling the number of sub-frames of the light-emitting diode units emitting light in one frame scanning time and controlling the light-emitting time of the light-emitting diode units emitting light in any sub-frame through a pulse width modulation signal; the light emitting brightness of the display module under the same display gray scale is more uniform, and the display effect of the display module is guaranteed.
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 (13)
1. A driving method of a display module is characterized in that the display module comprises:
the light emitting device comprises a plurality of light emitting units, a light emitting unit and a light emitting diode unit, wherein the light emitting units are arranged in an array;
a plurality of light emitting regions, any of the light emitting regions including at least one of the light emitting cells;
each driving signal line is electrically connected with one light-emitting unit and is used for transmitting pulse width modulation signals to the light-emitting units one by one, controlling the on/off of the light-emitting units and controlling the light-emitting time of the light-emitting units;
one frame of scanning time of any one light-emitting unit comprises a plurality of subframes;
the display module comprises a first light-emitting area and a second light-emitting area;
the driving method includes:
controlling the light emitting time of the light emitting diode units emitting light in any subframe through the pulse width modulation signal;
the display brightness of the first light-emitting area and the display brightness of the second light-emitting area under the same display gray scale within the one-frame scanning time are the same by respectively controlling the number of the sub-frames of the light-emitting diode units emitting light within the one-frame scanning time and the light-emitting time of the light-emitting diode units emitting light.
2. The method of driving a display module according to claim 1, wherein the number of the light-emitting units included in the first light-emitting area is smaller than the number of the light-emitting units included in the second light-emitting area;
the driving method includes:
and controlling the light emitting time of the light emitting diode units in the first light emitting area to be T1 and controlling the light emitting time of the light emitting diode units in the second light emitting area to be T2 when the pulse width modulation signals are transmitted to the light emitting units through the plurality of driving signal lines in the scanning time of one frame, wherein T1 is more than or equal to T2.
3. The driving method of a display module according to claim 2,
the light-emitting time T2 of the light-emitting diode unit in the second light-emitting area is controlled to be within the light-emitting time T1 of the light-emitting diode unit in the first light-emitting area.
4. The driving method of a display module according to claim 3,
the second light-emitting area comprises a first sub-light-emitting area, a second sub-light-emitting area, a third sub-light-emitting area and a fourth sub-light-emitting area which are identical in shape and area, the first sub-light-emitting area and the third sub-light-emitting area are diagonally arranged, and the second sub-light-emitting area and the fourth sub-light-emitting area are diagonally arranged; the shape and area of the first sub-light-emitting region and the first light-emitting region are the same;
the driving method further includes:
and controlling the light-emitting diode units in the first sub-light-emitting area and the third sub-light-emitting area to emit light in a time-sharing manner with the light-emitting diode units in the second sub-light-emitting area and the fourth sub-light-emitting area.
5. The driving method of a display module according to claim 4,
and controlling the light emitting diode units in the first sub-light-emitting area and the light emitting diode units in the third sub-light-emitting area to emit light simultaneously, and controlling the light emitting diode units in the second sub-light-emitting area and the light emitting diode units in the fourth sub-light-emitting area to emit light simultaneously.
6. A display module, comprising:
the light emitting device comprises a plurality of light emitting units, a light emitting unit and a light emitting diode unit, wherein the light emitting units are arranged in an array;
a plurality of light emitting regions, any of the light emitting regions including at least one of the light emitting cells;
each driving signal line is coupled with one light-emitting unit and is used for transmitting pulse width modulation signals to the light-emitting units one by one, controlling the on/off of the light-emitting units and controlling the light-emitting time of the light-emitting units;
the display module comprises a first light-emitting area and a second light-emitting area, the number of the light-emitting units in the first light-emitting area is smaller than that of the light-emitting units in the second light-emitting area, the light-emitting time of the light-emitting diode units in the first light-emitting area is longer than that of the light-emitting diode units in the second light-emitting area, and the display brightness of the first light-emitting area and the display brightness of the second light-emitting area under the same display gray scale in one frame scanning time are the same.
7. The display module of claim 6, wherein any of the LED units comprises at least one LED connected in series with the switch unit.
8. The display module of claim 7, wherein the light emitting diodes comprise Mini LEDs or Micro LEDs.
9. The display module of claim 6, further comprising:
the first end of any light emitting diode unit is electrically connected with the first power signal end, the second end of any light emitting diode unit is electrically connected with the first end of the corresponding switch unit, and the second end of any switch unit is electrically connected with the second power signal end; the control end of any one of the switch units is electrically connected with one of the driving signal lines.
10. The display module of claim 9, wherein any of the switch units comprises a field effect transistor, a gate of the field effect transistor is used as a control terminal of the switch unit, a first pole is used as a first terminal of the switch unit, and a second pole is used as a second terminal of the switch unit.
11. The display module of claim 10, further comprising:
and the current-limiting resistor is arranged between the second end of any one of the switch units and the second power supply signal end.
12. The display module according to claim 6, wherein any of the switch units comprises a first thin film transistor and a second thin film transistor, gates of the first thin film transistor and the second thin film transistor are electrically connected to the driving signal line, and the first thin film transistor and the second thin film transistor are turned on or turned off simultaneously; first poles of the first thin film transistor and the second thin film transistor serve as first ends of the switch units, and second poles of the first thin film transistor and the second thin film transistor serve as second ends of the switch units.
13. A display device, comprising the display module of any one of claims 6 to 12.
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| CN113948040B (en) * | 2021-11-22 | 2023-07-07 | 视涯科技股份有限公司 | Display panel |
| CN115881021B (en) * | 2023-03-03 | 2023-05-12 | 北京数字光芯集成电路设计有限公司 | Display control circuit and method, and micro display device |
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