CN110930953A - Mini-LED backlight module and liquid crystal display panel - Google Patents
Mini-LED backlight module and liquid crystal display panel Download PDFInfo
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- CN110930953A CN110930953A CN201911159216.1A CN201911159216A CN110930953A CN 110930953 A CN110930953 A CN 110930953A CN 201911159216 A CN201911159216 A CN 201911159216A CN 110930953 A CN110930953 A CN 110930953A
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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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Abstract
The embodiment of the application provides a mini-LED backlight unit, includes: a back plate; the LED light-emitting units are arranged on the back plate and distributed in a rectangular array; the input end of each switch tube is connected with a driving voltage signal, the control end of each switch tube is connected with a scanning voltage signal, and the output end of each switch tube is connected with the input end of at least one LED light-emitting unit; the light valve switches are arranged above the light emitting units, and each light valve switch is respectively opposite to one LED light emitting unit so as to adjust the light emitting area corresponding to the LED light emitting unit; and the driving control module is used for controlling to output scanning signals to the control end of each switch tube and outputting grating control signals to the light valve switch, and further adjusting the gray scale of the LED light-emitting unit by controlling the duty ratio of the switch tubes and the light-emitting area of the LED light-emitting unit corresponding to the switch tubes. The invention has the advantage of realizing more-level gray scale control.
Description
Technical Field
The application relates to the field of display, in particular to a mini-LED backlight module and a liquid crystal display panel.
Background
With the increasing requirements of users, the development speed of the mini-LED backlight module is rapid at present. However, there is no mature driving method in the world at present, and a common driving method is to realize gray scale display by controlling duty ratio adjustment of a thin film transistor by adopting a mode of connecting an LED and the thin film transistor or a field effect transistor in series, that is, driving is realized by a duty ratio method. However, the method requires high luminance of the LED, so the required current is very large, and as the refresh frequency of the display product is continuously increased, the real time of each frame is continuously reduced, so that the duty ratio driving is more difficult to realize the multi-gray scale level.
Disclosure of Invention
The embodiment of the application aims to provide a mini-LED backlight module and a liquid crystal display panel, which have the beneficial effect of realizing more-level gray scale control.
The embodiment of the application provides a mini-LED backlight unit, includes:
a back plate;
the LED light-emitting units are arranged on the back plate and distributed in a rectangular array;
the input end of each switch tube is connected with a driving voltage signal, the control end of each switch tube is connected with a scanning voltage signal, and the output end of each switch tube is connected with the input end of at least one LED light-emitting unit;
the light valve switches are arranged above the light emitting units, and each light valve switch is respectively opposite to one LED light emitting unit so as to adjust the light emitting area corresponding to the LED light emitting unit;
and the driving control module is used for controlling to output scanning signals to the control end of each switch tube and outputting grating control signals to the light valve switch, and further adjusting the gray scale of the LED light-emitting unit by controlling the duty ratio of the switch tubes and the light-emitting area of the LED light-emitting unit corresponding to the switch tubes.
In the mini-LED backlight module, the driving control module comprises a main control unit, a grating driving unit and a grid driving unit;
the main control unit is used for calculating corresponding duty ratio information and light-emitting area information according to the gray scale value of the LED light-emitting unit to be regulated, sending the duty ratio information to the grid driving unit and sending the light-emitting area information to the grating driving unit;
the grating driving unit is respectively connected with each light valve switch so as to respectively control the light emitting area of the LED light emitting unit corresponding to the light valve switch according to the light emitting area information;
the grid driving unit is connected with the control end of each switching tube respectively so as to control the duty ratio of each switching tube according to the duty ratio information respectively.
In the mini-LED backlight module described herein, the plurality of LED lighting units include a plurality of red LED lighting units, a plurality of green LED lighting units, and a plurality of blue LED lighting units.
In the mini-LED backlight module, the output end of each switch tube is connected with the input end of one LED light-emitting unit respectively.
In the mini-LED backlight module, the back plate comprises a plurality of rectangular areas distributed in a rectangular array, each rectangular area is internally provided with a plurality of LED light-emitting units, and the LED light-emitting units in the same rectangular area are connected with the output end of the same switch tube.
In the mini-LED backlight module, the rectangular area comprises a plurality of rectangular sub-areas which are arranged in an array, three LED light-emitting units are arranged in each rectangular sub-area, and each LED light-emitting unit comprises a red LED light-emitting unit, a green LED light-emitting unit and a blue LED light-emitting unit.
In the mini-LED backlight module, the light valve switch comprises a fixed grating and a movable grating, the movable grating is locally opposite to the fixed grating, and when the fixed grating is powered on, the movable grating is horizontally moved under the control of the drive control module to adjust the light emitting area of the corresponding LED light emitting unit.
In the mini-LED backlight module, the fixed gratings of the light valve switches corresponding to the same row of LED light-emitting units are sequentially connected to form a rectangular fixed grating area.
In the mini-LED backlight module, the switch tube is a field effect thin film transistor.
The embodiment of the application also provides a liquid crystal display panel which comprises any mini-LED backlight module.
The embodiment of the application provides a mini-LED backlight unit, include: a back plate; the LED light-emitting units are arranged on the back plate and distributed in a rectangular array; the input end of each switch tube is connected with a driving voltage signal, the control end of each switch tube is connected with a scanning voltage signal, and the output end of each switch tube is connected with the input end of at least one LED light-emitting unit; the light valve switches are arranged above the light emitting units, and each light valve switch is respectively opposite to one LED light emitting unit so as to adjust the light emitting area corresponding to the LED light emitting unit; the driving control module is used for controlling to output scanning signals to the control end of each switch tube and outputting grating control signals to the light valve switch, and further adjusting the gray scale of the LED light-emitting unit by controlling the duty ratio of the switch tubes and the light-emitting area of the LED light-emitting unit corresponding to the switch tubes; therefore, the gray scale can be adjusted in a mode of combining two dimensions, the adjusting range is wider, the gray scale control with more levels can be realized, and the display quality can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit structure diagram of a mini-LED backlight module according to an embodiment of the present application.
Fig. 2 is a top view structural diagram of a mini-LED backlight module according to an embodiment of the present application.
Fig. 3 is a layered structure diagram of a mini-LED backlight module according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 3, fig. 1 is a schematic circuit structure diagram of a mini-LED backlight module according to an embodiment of the present disclosure. Fig. 2 is a top view structural diagram of a mini-LED backlight module according to an embodiment of the present application. Fig. 3 is a layered structure diagram of a mini-LED backlight module according to an embodiment of the present application.
In some embodiments, the mini-LED backlight module comprises: the backlight module comprises a back plate 10, a plurality of LED light-emitting units 20, a plurality of switch tubes 30, a plurality of light valve switches 50 and a driving control module 40.
The plurality of LED light emitting units 20 are disposed on the back plate 10 and distributed in a rectangular array; the input end of each switch tube 30 is connected with a driving voltage signal, the control end is connected with a scanning voltage signal, and the output end is connected with the input end of at least one LED light-emitting unit 20; the light valve switches 50 are disposed above the light emitting units 20, and each light valve switch 50 is respectively opposite to one LED light emitting unit 20 for adjusting the light emitting area of the corresponding LED light emitting unit 20; the driving control module 40 is configured to control to output a scanning signal to the control end of each of the switch tubes 30 and output a grating control signal to the light valve switch 50, so as to adjust the gray scale of the LED light emitting unit by controlling the duty ratio of the switch tube 30 and the light emitting area of the LED light emitting unit 20 corresponding to the switch tube 30.
Specifically, in some embodiments, the driving control module 40 includes a main control unit 43, a grating driving unit 42, and a gate driving unit 41; the raster drive unit 42 and the gate drive unit 41 are connected to the main control unit 43. The main control unit 43 is configured to calculate corresponding duty ratio information and light emitting area information according to a gray scale value of the LED light emitting unit 20 to be adjusted, send the duty ratio information to the gate driving unit 42, and send the light emitting area information to the grating driving unit 42; the grating driving unit 42 is connected to each light valve switch 50, respectively, to control the light emitting area of the LED light emitting unit 20 corresponding to the light valve switch 50 according to the light emitting area information; the gate driving unit 41 is connected to the control end of each switching tube 30, respectively, to control the duty ratio of each switching tube 30 according to the duty ratio information, respectively.
The grating driving unit 42 includes a plurality of grating driving units, and each grating driving unit drives one light valve switch 50. Of course, it is understood that the main control unit 43, the grating driving unit 42 and the gate driving unit 41 may be integrated together to form a composite chip.
In some embodiments, the plurality of LED lighting units 20 includes a plurality of red LED lighting units 20a, a plurality of green LED lighting units 20b, and a plurality of blue LED lighting units 20 c.
In some embodiments, the output terminal of each switch tube 30 is connected to the input terminal of one LED lighting unit 20.
In the embodiment shown in fig. 2, the back plate 10 includes a plurality of rectangular areas 101 distributed in a rectangular array, a plurality of LED lighting units 20 are disposed in each of the rectangular areas 101, and the LED lighting units 20 in the same rectangular area 101 are connected to the output end of the same switch tube 30.
Furthermore, the rectangular area 101 includes a plurality of rectangular sub-areas 1011 arranged in an array, three LED lighting units 20 are disposed in each rectangular sub-area 1011, and each of the three LED lighting units 20 includes a red LED lighting unit 20a, a green LED lighting unit 20b, and a blue LED lighting unit 20 c.
The light valve switch 50 includes a fixed grating 51 and a movable grating 52, the movable grating 52 is locally opposite to the fixed grating 51, and when the fixed grating 51 is powered on, the movable grating 52 moves horizontally under the control of the driving control module 40 to adjust the light emitting area corresponding to the LED light emitting unit 20.
In some embodiments, the fixed gratings 51 of the light valve switches 50 corresponding to the LED lighting units 20 in the same row are sequentially connected to form a rectangular fixed grating area.
In some embodiments, the switch tube 30 is a field effect thin film transistor, but other switching transistors may be used.
When the system works, the main control unit 43 is configured to calculate corresponding duty ratio information and light emitting area information according to a gray scale value of the LED light emitting unit 20 to be adjusted, send the duty ratio information to the gate driving unit 42, and send the light emitting area information to the grating driving unit 42; the grating driving unit 42 is connected to each light valve switch 50, respectively, to control the light emitting area of the LED light emitting unit 20 corresponding to the light valve switch 50 according to the light emitting area information; the gate driving unit 41 is connected to the control end of each switching tube 30, respectively, to control the duty ratio of each switching tube 30 according to the duty ratio information, respectively.
When the light-emitting area and the adjustment weight of the duty ratio to the gray scale are specifically distributed, each gray scale value corresponds to a specific light-emitting area and a duty ratio according to a preset mapping table, and each gray scale value corresponds to a specific light-emitting area and a duty ratio which are the best combination of power consumption and effect obtained through multiple experiments.
The embodiment of the application provides a mini-LED backlight unit, include: a back plate; the LED light-emitting units are arranged on the back plate and distributed in a rectangular array; the input end of each switch tube is connected with a driving voltage signal, the control end of each switch tube is connected with a scanning voltage signal, and the output end of each switch tube is connected with the input end of at least one LED light-emitting unit; the light valve switches are arranged above the light emitting units, and each light valve switch is respectively opposite to one LED light emitting unit so as to adjust the light emitting area corresponding to the LED light emitting unit; the driving control module is used for controlling to output scanning signals to the control end of each switch tube and outputting grating control signals to the light valve switch, and further adjusting the gray scale of the LED light-emitting unit by controlling the duty ratio of the switch tubes and the light-emitting area of the LED light-emitting unit corresponding to the switch tubes; therefore, the gray scale can be adjusted in a mode of combining two dimensions, the adjusting range is wider, the gray scale control with more levels can be realized, and the display quality can be improved.
The invention also provides a liquid crystal display panel which comprises the mini-LED backlight module and the display panel in any embodiment.
The mini-LED backlight module and the liquid crystal display panel provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the above embodiments is only used to help understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A mini-LED backlight module is characterized by comprising:
a back plate;
the LED light-emitting units are arranged on the back plate and distributed in a rectangular array;
the input end of each switch tube is connected with a driving voltage signal, the control end of each switch tube is connected with a scanning voltage signal, and the output end of each switch tube is connected with the input end of at least one LED light-emitting unit;
the light valve switches are arranged above the light emitting units, and each light valve switch is respectively opposite to one LED light emitting unit so as to adjust the light emitting area corresponding to the LED light emitting unit;
and the driving control module is used for controlling to output scanning signals to the control end of each switch tube and outputting grating control signals to the light valve switch, and further adjusting the gray scale of the LED light-emitting unit by controlling the duty ratio of the switch tubes and the light-emitting area of the LED light-emitting unit corresponding to the switch tubes.
2. The mini-LED backlight module as claimed in claim 1, wherein the driving control module comprises a main control unit, a grating driving unit, and a gate driving unit;
the main control unit is used for calculating corresponding duty ratio information and light-emitting area information according to the gray scale value of the LED light-emitting unit to be regulated, sending the duty ratio information to the grid driving unit and sending the light-emitting area information to the grating driving unit;
the grating driving unit is respectively connected with each light valve switch so as to respectively control the light emitting area of the LED light emitting unit corresponding to the light valve switch according to the light emitting area information;
the grid driving unit is connected with the control end of each switching tube respectively so as to control the duty ratio of each switching tube according to the duty ratio information respectively.
3. The mini-LED backlight module as claimed in claim 2, wherein the plurality of LED lighting units comprises a plurality of red LED lighting units, a plurality of green LED lighting units and a plurality of blue LED lighting units.
4. The mini-LED backlight module as claimed in any of claims 1-3, wherein the output terminal of each of the switch tubes is connected to the input terminal of one of the LED light-emitting units.
5. The mini-LED backlight module as claimed in any of claims 1 to 3, wherein the back plate comprises a plurality of rectangular areas distributed in a rectangular array, each rectangular area is provided with a plurality of LED light-emitting units, and the LED light-emitting units in the same rectangular area are connected with the output end of the same switch tube.
6. The mini-LED backlight module as claimed in claim 5, wherein the rectangular area comprises a plurality of rectangular sub-areas arranged in an array, three LED units are disposed in each of the rectangular sub-areas, and the three LED units comprise a red LED unit, a green LED unit and a blue LED unit.
7. The mini-LED backlight module according to any of claims 1-3, wherein the light valve switch comprises a fixed grating and a movable grating, the movable grating is partially opposite to the fixed grating, and when the fixed grating is powered on, the movable grating moves horizontally under the control of the driving control module to adjust the light emitting area corresponding to the LED light emitting unit.
8. The mini-LED backlight module as claimed in claim 7, wherein the fixed gratings of the light valve switches corresponding to the LED light emitting units in the same row are sequentially connected to form a rectangular fixed grating region.
9. The mini-LED backlight module as claimed in claim 1, wherein the switching tubes are field effect thin film transistors.
10. A liquid crystal display panel comprising the mini-LED backlight module according to any one of claims 1 to 9.
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| CN201911159216.1A CN110930953A (en) | 2019-11-22 | 2019-11-22 | Mini-LED backlight module and liquid crystal display panel |
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| CN201911159216.1A CN110930953A (en) | 2019-11-22 | 2019-11-22 | Mini-LED backlight module and liquid crystal display panel |
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Cited By (6)
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| CN112599103A (en) * | 2020-12-15 | 2021-04-02 | Tcl华星光电技术有限公司 | Backlight module circuit and liquid crystal display device |
| WO2021223268A1 (en) * | 2020-05-06 | 2021-11-11 | Tcl华星光电技术有限公司 | Backlight module, display panel, and electronic apparatus |
| CN113674623A (en) * | 2021-08-13 | 2021-11-19 | Tcl华星光电技术有限公司 | Backlight panel, backlight module and display device |
| WO2022027726A1 (en) * | 2020-08-05 | 2022-02-10 | 武汉华星光电技术有限公司 | Led lamp panel, spliced led lamp panel, and display apparatus |
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| US11587917B2 (en) | 2020-05-06 | 2023-02-21 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module, display panel and electronic device |
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Application publication date: 20200327 |