CN112599103B - Backlight module circuit and liquid crystal display device - Google Patents
Backlight module circuit and liquid crystal display device Download PDFInfo
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- CN112599103B CN112599103B CN202011484173.7A CN202011484173A CN112599103B CN 112599103 B CN112599103 B CN 112599103B CN 202011484173 A CN202011484173 A CN 202011484173A CN 112599103 B CN112599103 B CN 112599103B
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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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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Abstract
The application provides a backlight module circuit and a liquid crystal display device, wherein the backlight module circuit comprises a plurality of subarea backlight units and a control unit; any one of the subarea backlight units comprises a light emitting diode in a light emitting diode main area and a light emitting diode in a light emitting diode sub area; the light emitting diodes in the light emitting diode main region and the light emitting diodes in the light emitting diode sub-region are connected in parallel to the control unit. The partition backlight unit is divided into a light emitting diode main area and a light emitting diode auxiliary area; the brightness of the LED sub-area is adjusted by adding a control switch in each second LED group in the LED sub-area, so that the gray scale number of the LEDs in the LED main area and the LEDs in the LED sub-area after being connected in parallel is increased, the backlight unit achieves higher bit number, and further more fine picture display of the liquid crystal screen is realized.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module circuit and a liquid crystal display device.
Background
With the rapid development of the LCD display screen technology, the large-scale application of the LED backlight module makes the response speed and the picture quality of the LCD television improved. The mini LED backlight adopts an active structure and matrix distribution, and the TFT device is used for controlling the light emitting diode to emit light, so that multiple partitions can be realized, and the whole television can realize higher-quality display.
At present, the backlight with high bite number in the LCD display screen can realize finer and finer picture display, so that the improvement of the bite number is the development trend of the LCD display screen technology in the future; however, there is a certain difficulty in achieving a high bit count in LCD displays, subject to the effects of factors such as LCD charging time and charging delay.
Disclosure of Invention
The application provides a backlight module circuit and a liquid crystal display device, which are used for improving the bit number of a liquid crystal screen and further realizing the finer and finer picture display of the liquid crystal screen.
In order to realize the functions, the technical scheme provided by the application is as follows:
a backlight module circuit comprises a plurality of subarea backlight units and a control unit;
any one of the subarea backlight units comprises a light-emitting diode main area and a light-emitting diode auxiliary area; the light emitting diodes in the light emitting diode main region and the light emitting diodes in the light emitting diode sub-region are connected to the control unit in parallel;
the control unit is used for lighting the light emitting diodes in the light emitting diode main area and the light emitting diodes in the light emitting diode sub area;
the light-emitting diode sub-region comprises N second light-emitting diode groups connected in parallel; any one of the second LED groups comprises a control switch (T3); the control switch (T3) controls the on and off of the light-emitting diodes in the corresponding second light-emitting diode group; and when the light emitting diodes in the light emitting diode main region and the light emitting diodes in the N parallel second light emitting diode groups are simultaneously lightened, the backlight module circuit increases N bit numbers, wherein N is a positive integer.
In the backlight module circuit, the main area of the light emitting diode comprises M first light emitting diode groups connected in parallel; any one of the first light-emitting diode groups and any one of the second light-emitting diode groups comprise a plurality of light-emitting diodes which are connected in series; wherein M is a positive integer greater than or equal to 1 and less than or equal to N;
the first and second light emitting diode groups are connected between the control unit and a power supply positive Voltage (VDD).
In the backlight module circuit of the present application, the brightness of the light emitting diodes in the second light emitting diode group is less than or equal to the brightness of the light emitting diodes in the first light emitting diode group.
In the backlight module circuit of the present application, the control unit includes a first control switch (T1) and a second control switch (T2);
the gate of the first control switch (T1) is connected to a SCAN signal (SCAN 1) of level 1, the first end of the first control switch (T1) is connected to the data signal trace (data), and the second end of the first control switch (T1) is electrically connected to the gate of the second control switch (T2);
the grid electrode of the second control switch (T2) is electrically connected with the second end of the first control switch (T1), the first end of the second control switch (T2) is connected with a low-potential power supply signal (Vss), and the second end of the second control switch (T2) is connected with the parallel circuit of the first light-emitting diode group and the second light-emitting diode group;
wherein the second control switch (T2) is controlled to be turned on by a data signal trace (data) through a signal input by the first control switch (T1).
In the backlight module circuit, the second control switch (T2) is controlled to be turned on by a data signal routing (data) through a signal input by the first control switch (T1); the first control switch (T1) and the second control switch (T2) control the turning on and off of the light emitting diodes in the first light emitting diode group.
In the backlight module circuit of the present application, the first control switch (T1), the second control switch (T2) and the third control switch (T3) control the on and off of the second light emitting diode group.
In the backlight module circuit of the present application, the first control switch (T1), the second control switch (T2) and the control switch (T3) are all thin film transistors.
In the backlight module circuit of the present application, the gate of the control switch (T3) in the nth second led group is connected to the nth SCAN Signal (SCAN), the first end of the control switch (T3) is connected to the anode of the corresponding second led group, the second end of the control switch (T3) is connected to the positive Voltage (VDD), wherein N is a positive integer, and N is equal to N + 1.
In the backlight module circuit of the present application, the gate of the control switch (T3) in the nth second led group is connected to the nth SCAN Signal (SCAN), the first end of the control switch (T3) is connected to the second end of the second control switch (T2), and the second end of the control switch (T3) is connected to the cathode of the second led group, wherein N is a positive integer and N is equal to N + 1.
The application also provides a liquid crystal display device, including the LCD screen and as above-mentioned backlight unit circuit, the backlight unit circuit does the LCD screen provides backlight.
Has the advantages that: any one of the subarea backlight units is divided into a light-emitting diode main area and a light-emitting diode auxiliary area; the light emitting diodes in the light emitting diode main region and the light emitting diodes in the light emitting diode sub-region are connected to the control unit in parallel; the control switch is additionally arranged in each second light-emitting diode group in the light-emitting diode sub-area, the control switch controls the light-emitting diodes in the corresponding second light-emitting diode groups to be turned on and off, and the brightness of the light-emitting diodes in the light-emitting diode sub-area is adjusted, so that the gray scale number of the light-emitting diodes in the light-emitting diode main area and the gray scale number of the light-emitting diodes in the light-emitting diode sub-area after being connected in parallel are increased, the backlight unit achieves higher bit number, and finer picture display of the liquid crystal screen is achieved.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a block diagram of a backlight module circuit provided in the present application;
FIG. 2 is a circuit diagram of a backlight module circuit provided in the present application;
fig. 3 is a first circuit diagram of a backlight module circuit according to an embodiment of the present disclosure;
fig. 4 is a second circuit diagram of a backlight module circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, the high-bite-number backlight of the LCD screen can realize finer and finer picture display, so that the improvement of the bite number is inevitably the development trend of the LCD screen technology in the future; however, the realization of high bit count LCD displays is difficult due to the influence of factors such as LCD charging time and charging delay. Based on this, this application provides a backlight unit circuit and liquid crystal disply device, can solve the defect of complaining.
Referring to fig. 1, a block diagram of a backlight module circuit provided in the present application is shown.
In the present application, the backlight module circuit includes a plurality of partitioned backlight units 10 and a control unit 20; any one of the partitioned backlight units 10 includes a light emitting diode main region 11 and a light emitting diode sub-region 12; the leds in the led main region 11 and the leds in the led sub-region 12 are connected in parallel to the control unit 20.
The control unit 20 is configured to light the leds in the led main region 11 and the leds in the led sub-region 12.
Referring to fig. 2, a circuit diagram of a backlight module circuit provided in the present application is shown.
In the present application, the light emitting diode main region 11 includes M first light emitting diode groups 111 connected in parallel; the led sub-region 12 includes N second led groups 121 connected in parallel; each of the first led group 111 and the second led group 121 includes a plurality of leds connected in series; the first and second light emitting diode groups 111 and 121 are connected between the control unit 20 and a power supply positive Voltage (VDD); wherein N is a positive integer, M is a positive integer greater than or equal to 1 and less than or equal to N.
In the present application, any one of the second led sets 121 includes a control switch (T3); the control switch (T3) controls the on and off of the corresponding light emitting diode in the second light emitting diode group 121.
In this application, when the light emitting diodes in the M parallel first light emitting diode groups 111 and the light emitting diodes in the N parallel second light emitting diode groups 121 are simultaneously turned on, the backlight module circuit increases N number of bits, where N is a positive integer, and M is a positive integer greater than or equal to 1 and less than or equal to N.
The partition backlight unit 10 is divided into a light emitting diode main area 11 and a light emitting diode sub area 12; the brightness of the led sub-region 12 is adjusted by adding a control switch (T3) to each second led group 121 in the led sub-region 12, so that the number of gray scales after the parallel connection of the leds in the led main region 10 and the leds in the led sub-region 20 is increased, and the backlight unit achieves a higher number of bits, thereby achieving a finer screen display of the lcd.
The technical solution of the present application will now be described with reference to specific embodiments.
Example one
Referring to fig. 3, a first circuit diagram of a backlight module circuit provided in the embodiment of the present application is shown.
In the present embodiment, the backlight module circuit includes a plurality of partitioned backlight units 10 and a control unit 20; any one of the partitioned backlight units 10 includes a light emitting diode main region 11 and a light emitting diode sub-region 12; the leds in the led main region 11 and the leds in the led sub-region 12 are connected in parallel to the control unit 20.
The control unit 20 is configured to light the leds in the led main region 11 and the leds in the led sub-region 12.
In the present embodiment, the light emitting diode main region 11 includes M first light emitting diode groups 111 connected in parallel; the led sub-region 12 includes N second led groups 121 connected in parallel; each of the first led group 111 and the second led group 121 includes a plurality of leds connected in series; the first and second light emitting diode groups 111 and 121 are connected between the control unit 20 and a power supply positive Voltage (VDD); wherein N is a positive integer, M is a positive integer greater than or equal to 1 and less than or equal to N.
Further, in the present embodiment, the led main region 11 includes a first led group 111; the led sub-region 12 comprises a second led group 121; each of the first led group 111 and any of the second led groups 121 includes one led.
In this embodiment, the second led set 121 includes a control switch (T3); the control switch (T3) controls the on and off of the corresponding light emitting diode in the second light emitting diode group 121.
In this embodiment, the gate of the control switch (T3) in the nth second led group 121 is connected to the nth SCAN signal (SCAN N), the first terminal of the control switch (T3) is connected to the positive electrode of the corresponding second led group 121, and the second terminal of the control switch (T3) is connected to the positive power supply Voltage (VDD), where N is a positive integer and N is equal to N + 1.
Further, in the present embodiment, a gate of the control switch (T3) is connected to the SCAN signal of level 2 (SCAN 2), a first terminal of the control switch (T3) is connected to the anode of the corresponding led in the second led group 121, and a second terminal of the control switch (T3) is connected to the positive power supply Voltage (VDD).
In the present embodiment, the control unit 20 includes a first control switch (T1) and a second control switch (T2); the first control switch (T1), the second control switch (T2) and the control switch (T3) are all thin film transistors.
The gate of the first control switch (T1) is connected to the SCAN signal (SCAN 1) of level 1, the first end of the first control switch (T1) is connected to the data signal trace (data), and the second end of the first control switch (T1) is electrically connected to the gate of the second control switch (T2).
The gate of the second control switch (T2) is electrically connected to the second terminal of the first control switch (T1), the first terminal of the second control switch (T2) is electrically connected to a low-potential power signal (Vss), and the second terminal of the second control switch (T2) is connected to the parallel circuit of the first led set 111 and the second led set 121.
In the embodiment, the second control switch (T2) is controlled to be turned on by a signal input by a data signal wire (data) through the first control switch (T1); the first control switch (T1) and the second control switch (T2) control the on and off of the light emitting diodes in the first light emitting diode group 111; the first control switch (T1), the second control switch (T2), and the third control switch (T3) control the on and off of the light emitting diodes in the second light emitting diode group 121.
The brightness of the leds in the second led group 121 is less than or equal to the brightness of the leds in the first led group 111, which is not limited in this embodiment.
In the present embodiment, when the first control switch (T1) and the second control switch (T2) control the light emitting diodes in the first light emitting diode group 111 to be turned on, the light emitting diodes in the first light emitting diode group 111 have 3 bits and 8 gray scales; when a display device (such as a liquid crystal display) needs a high-brightness and high-quality display effect, the control switch (T3) controls the light-emitting diodes in the second light-emitting diode group 121 to be turned on; the light emitting diodes in the first light emitting diode group 111 and the light emitting diodes in the second light emitting diode group 121 are connected in parallel, so that the number of the light emitting diodes is increased to 4, and thus, finer picture display of the liquid crystal display is realized.
It should be noted that, in this embodiment, the led main region 11 includes a first led group 111, the led sub-region 12 includes a second led group 121, each of the first led group 111 and any one of the second led groups 121 includes a led, a gate of the control switch (T3) is connected to the 2 nd SCAN signal (SCAN 2), the leds in the first led group 111 have 3 bits and 8 gray scales, and the number of the leds is increased to 4 bits for illustration only, which is not limited in this embodiment.
In the embodiment, any one of the subarea backlight units 10 is divided into a light-emitting diode main area 11 and a light-emitting diode sub-area 12; the light emitting diodes in the light emitting diode main region 11 and the light emitting diodes in the light emitting diode sub-region 12 are connected in parallel to the control unit 20; by adding a control switch (T3) to each second led group 121 in the led sub-region 12, the control switch controls (T3) the on and off of the leds in the corresponding second led group 121, and adjusts the brightness of the leds in the led sub-region 12, so as to increase the number of gray scales after the leds in the led main region 11 and the leds in the led sub-region 12 are connected in parallel, so that the backlight unit 10 achieves a higher number of bits, and thus achieves a finer screen display of the lcd.
Referring to fig. 4, a second circuit diagram of a backlight module circuit provided in the embodiment of the present application is shown.
In this embodiment, the circuit diagram of the backlight module circuit is similar to/the same as the first circuit diagram of the backlight module circuit provided in the above embodiment, and please refer to the description of the backlight module circuit in the above embodiment, which is not repeated herein, and the difference between the two is only:
in this embodiment, the gate of the control switch (T3) in the nth second led group 121 is connected to the nth SCAN signal (SCAN N), the first terminal of the control switch (T3) is connected to the second terminal of the second control switch (T2), and the second terminal of the control switch (T3) is connected to the cathode of the second led group 121, where N is a positive integer and N is equal to N + 1.
Further, in this embodiment, the gate of the control switch (T3) is connected to the SCAN signal (SCAN 2) of the 2 nd level, the first terminal of the control switch (T3) is connected to the second terminal of the second control switch (T2), and the second terminal of the control switch (T3) is connected to the cathode of the light emitting diode in the second light emitting diode set 121.
Example two
The embodiment further provides a liquid crystal display device, the liquid crystal display device comprises a liquid crystal screen and a backlight module circuit, and the backlight module circuit provides backlight for the liquid crystal screen.
The backlight module circuit has been described in detail in the first embodiment, and thus is not described herein again.
The application provides a backlight module circuit and a liquid crystal display device, wherein the backlight module circuit comprises a plurality of subarea backlight units and a control unit; any one of the subarea backlight units comprises a light emitting diode in a light emitting diode main area and a light emitting diode in a light emitting diode sub area; the light emitting diodes in the light emitting diode main area and the light emitting diodes in the light emitting diode secondary area are connected to the control unit in parallel; the control unit is used for lighting the light emitting diodes in the light emitting diode main area and the light emitting diodes in the light emitting diode sub area; the light-emitting diode sub-region comprises N second light-emitting diode groups connected in parallel; any one of the second LED groups comprises a control switch (T3); the control switch (T3) controls the on and off of the light-emitting diodes in the corresponding second light-emitting diode group; and when the light emitting diodes in the light emitting diode main region and the light emitting diodes in the N parallel second light emitting diode groups are simultaneously lightened, the backlight module circuit increases N bit numbers, wherein N is a positive integer.
The partition backlight unit is divided into a light emitting diode main area and a light emitting diode auxiliary area; the brightness of the LED sub-area is adjusted by adding a control switch in each second LED group in the LED sub-area, so that the number of gray scales of the LEDs in the LED main area and the LEDs in the LED sub-area after being connected in parallel is increased, a backlight unit achieves higher bit number, and further more fine and smooth picture display of a liquid crystal screen is realized.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The backlight module circuit and the liquid crystal display device provided by the embodiment of the present application are introduced in detail, and a specific example is applied to explain the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (8)
1. The backlight module circuit is characterized by comprising a plurality of subarea backlight units and a control unit;
any one of the subarea backlight units comprises a light-emitting diode main area and a light-emitting diode auxiliary area; the light emitting diodes in the light emitting diode main region and the light emitting diodes in the light emitting diode sub-region are connected to the control unit in parallel;
the control unit is used for lighting the light emitting diodes in the light emitting diode main area and the light emitting diodes in the light emitting diode sub area;
the light-emitting diode sub-region comprises N second light-emitting diode groups connected in parallel; any one of the second LED groups comprises a control switch (T3); the control switch (T3) controls the on and off of the light-emitting diodes in the corresponding second light-emitting diode group; when the light emitting diodes in the light emitting diode main region and the light emitting diodes in the N second light emitting diode groups connected in parallel are simultaneously lightened, the backlight module circuit increases N bit numbers, wherein N is a positive integer;
the light emitting diode main region comprises M first light emitting diode groups connected in parallel; any one of the first light-emitting diode groups and any one of the second light-emitting diode groups comprise a plurality of light-emitting diodes which are connected in series; wherein M is a positive integer greater than 1 and less than N; the first and second light emitting diode groups are connected between the control unit and a power supply positive Voltage (VDD); the brightness of the light emitting diodes in the second light emitting diode group is smaller than that of the light emitting diodes in the first light emitting diode group.
2. The backlight module circuit as claimed in claim 1, wherein the control unit comprises a first control switch (T1) and a second control switch (T2);
the gate of the first control switch (T1) is connected to a SCAN signal (SCAN 1) of level 1, the first end of the first control switch (T1) is connected to the data signal trace (data), and the second end of the first control switch (T1) is electrically connected to the gate of the second control switch (T2);
the grid electrode of the second control switch (T2) is electrically connected with the second end of the first control switch (T1), the first end of the second control switch (T2) is connected with a low-potential power supply signal (Vss), and the second end of the second control switch (T2) is connected with the parallel circuit of the first light-emitting diode group and the second light-emitting diode group;
wherein the second control switch (T2) is controlled to be turned on by a data signal trace (data) through a signal input by the first control switch (T1).
3. The backlight module circuit according to claim 2, wherein the second control switch (T2) is turned on by a signal inputted from the data signal trace (data) through the first control switch (T1); the first control switch (T1) and the second control switch (T2) control the turning on and off of the light emitting diodes in the first light emitting diode group.
4. The backlight module circuit according to claim 3, wherein the first control switch (T1), the second control switch (T2) and the control switch (T3) control the on and off of the second LED group.
5. The backlight module circuit of claim 4, wherein the first control switch (T1), the second control switch (T2) and the control switch (T3) are all thin film transistors.
6. The backlight module circuit as claimed in claim 1, wherein the gate of the control switch (T3) in the nth second led group is connected to the nth SCAN Signal (SCAN), the first terminal of the control switch (T3) is connected to the positive electrode of the corresponding second led group, and the second terminal of the control switch (T3) is connected to the positive power supply Voltage (VDD), wherein N is a positive integer and N is equal to N + 1.
7. The backlight module circuit as claimed in claim 2, wherein the gate of the control switch (T3) in the nth second led group is connected to the nth SCAN signal (SCAN N), the first terminal of the control switch (T3) is connected to the second terminal of the second control switch (T2), and the second terminal of the control switch (T3) is connected to the cathode of the second led group, wherein N is a positive integer and N is equal to N + 1.
8. A liquid crystal display device comprising a liquid crystal panel and the backlight module circuit of any one of claims 1-7, the backlight module circuit providing backlight to the liquid crystal panel.
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| CN114994979B (en) * | 2022-05-20 | 2023-08-29 | 北京显芯科技有限公司 | Backlight circuit and liquid crystal display |
| CN115376472B (en) * | 2022-09-29 | 2023-09-19 | 惠科股份有限公司 | Backlight module, display module and electronic equipment |
| CN117198229B (en) * | 2023-08-31 | 2024-08-09 | 惠科股份有限公司 | Display device and driving method of display device |
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| CN110930953A (en) * | 2019-11-22 | 2020-03-27 | 深圳市华星光电半导体显示技术有限公司 | Mini-LED backlight module and liquid crystal display panel |
| CN112017589A (en) * | 2020-09-08 | 2020-12-01 | Tcl华星光电技术有限公司 | Multi-gray-scale pixel driving circuit and display panel |
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