CN113421499A - Backlight panel, backlight module and display device - Google Patents
Backlight panel, backlight module and display device Download PDFInfo
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- CN113421499A CN113421499A CN202110611783.7A CN202110611783A CN113421499A CN 113421499 A CN113421499 A CN 113421499A CN 202110611783 A CN202110611783 A CN 202110611783A CN 113421499 A CN113421499 A CN 113421499A
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- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
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- 239000012788 optical film Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
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- Computer Hardware Design (AREA)
- Planar Illumination Modules (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The embodiment of the application discloses a backlight panel, a backlight module and a display device, wherein the backlight panel comprises a substrate and a light-emitting unit, and a control circuit, a first power supply signal wire and a second power supply signal wire are arranged on the substrate; the light emitting unit comprises a plurality of sub-light emitting units, each sub-light emitting unit comprises a light emitting device, a first control switch and a voltage division element, the light emitting devices are connected between the first power supply signal line and the second power supply signal line in series, and the control circuit is electrically connected with the first control switch to control the first control switch to be switched on or switched off; the resistance value of the voltage dividing element of the sub light emitting unit is gradually decreased along a direction from the input terminal to the output terminal of the first power signal line. This application reduces gradually through the direction of the input to the output that makes the partial pressure component of sub-luminescence unit's resistance follow first power signal line, reduces the current difference of each sub-luminescence unit of flowing through, improves the homogeneity of the whole luminance of backlight lamp plate.
Description
Technical Field
The application relates to the field of display, concretely relates to backlight plate, backlight unit and display device.
Background
With the increasing demand of the high-level TV market for image quality, the display image quality is improved to become a new demand of the high-level TV, and a Mini LED (submillimeter light emitting diode) or a Micro LED (Micro light emitting diode) is used as a brand new display technology, and has advantages in brightness and power consumption compared with an OLED (organic light emitting diode). The Mini-LED/Micro-LED is a current-driven LED which emits light, and the LED is sensitive to weak change of current, and small current change can cause large brightness change. When the backlight lamp panel is designed in the prior art, the difference of voltage or current of different areas of the backlight lamp panel is large, so that the brightness of the backlight lamp panel is uneven.
Disclosure of Invention
The embodiment of the application provides a backlight plate, a backlight module and a display device, which can solve the problem that the brightness of the backlight plate is uneven due to the fact that the voltage or current difference of different areas of the backlight plate is large in the prior art.
The embodiment of the application provides a lamp plate in a poor light, include:
a substrate on which a control circuit, a first power supply signal line, and a second power supply signal line are disposed;
a light emitting unit disposed on the substrate, the light emitting unit including a plurality of sub light emitting units including a light emitting device, a first control switch, and a voltage dividing element, the light emitting device, the first control switch, and the voltage dividing element being connected in series between the first power signal line and the second power signal line; the control circuit is electrically connected with the first control switch to control the first control switch to be switched on or switched off;
the resistance value of the voltage dividing element of the sub light emitting unit is gradually decreased in a direction from the input terminal to the output terminal of the first power signal line.
Alternatively, in some embodiments of the present application, the light emitting device, the first control switch, and the voltage dividing element are sequentially connected in series between the first power supply signal line and the second power supply signal line.
Optionally, in some embodiments of the present application, the voltage dividing element includes a plurality of sub voltage dividing elements, at least some of which are connected in series; and/or at least part of the sub voltage dividing elements are connected in parallel;
the sum of the resistance values of the plurality of sub voltage-dividing elements gradually decreases in a direction from the input terminal to the output terminal of the first power signal line.
Alternatively, in some embodiments of the present application, the light emitting device is connected between the first power signal line and the first control switch, and the plurality of sub voltage dividing elements are connected between the first control switch and the second power signal line.
Optionally, in some embodiments of the present application, the voltage dividing element includes a first thin film transistor and/or a resistor.
Optionally, in some embodiments of the present application, an input terminal of the first thin film transistor is electrically connected to an output terminal of the first control switch, an output terminal of the first thin film transistor is electrically connected to the second power signal line, and a control terminal of the first thin film transistor is electrically connected to the first power signal line.
Optionally, in some embodiments of the present application, the first control switch includes a second thin film transistor, an input terminal of the first thin film transistor is electrically connected to an output terminal of the second thin film transistor, an output terminal of the first thin film transistor is electrically connected to the second power signal line, and a control terminal of the first thin film transistor is electrically connected to a control terminal of the second thin film transistor.
Optionally, in some embodiments of the present application, the voltage dividing element includes a plurality of the first thin film transistors and a plurality of the resistors;
at least one of the first thin film transistors and at least one of the resistors are connected in series between the first control switch and the second power supply signal line; and/or the presence of a gas in the gas,
at least one of the first thin film transistors and at least one of the resistors are connected in parallel between the first control switch and the second power supply signal line.
Correspondingly, the embodiment of the application also provides a backlight module, which comprises the backlight panel.
Correspondingly, the embodiment of the application also provides a display device which comprises the backlight module.
The backlight lamp panel comprises a first power signal line, a second power signal line and a plurality of sub-light emitting units, and the voltage dividing elements are arranged in the sub-light emitting units, and the resistance values of the voltage dividing elements of the sub-light emitting units are gradually reduced along the direction from the input end to the output end of the first power signal line, so that the influence of internal resistance voltage drop caused by the resistance values of the first power signal line can be reduced, the current difference flowing through each sub-light emitting unit is reduced, and the uniformity of the whole luminance of the backlight lamp panel is 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 diagram of a backlight panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present application.
Description of reference numerals:
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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
The embodiment of the application provides a backlight panel, a backlight module and a display device. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
First, an embodiment of the present application provides a backlight panel, including a substrate and a light emitting unit, wherein the substrate is provided with a control circuit, a first power signal line and a second power signal line; the light emitting unit is arranged on the substrate, and comprises a plurality of sub-light emitting units, each sub-light emitting unit comprises a light emitting device, a first control switch and a voltage division element, and the light emitting devices, the first control switches and the voltage division elements are connected between the first power signal line and the second power signal line in series; the control circuit is electrically connected with the first control switch to control the first control switch to be switched on or switched off; the resistance value of the voltage dividing element of the sub light emitting unit is gradually decreased along a direction from the input terminal to the output terminal of the first power signal line.
Fig. 1 is a schematic circuit diagram of a backlight panel provided in an embodiment of the present application, and as shown in fig. 1, the backlight panel 110 includes a substrate 111 and a light-emitting unit 115, where the substrate 111 is provided with a control circuit 112, a first power signal line 113 and a second power signal line 114, which are used for controlling the light-emitting condition of the light-emitting unit 115, and the setting of the control circuit 112 can realize the regulation and control of the light-emitting conditions of different light-emitting units 115, so as to adjust the display brightness of the backlight panel 110.
The substrate 111 used in the embodiment of the present application may be a glass substrate 111 or a printed circuit substrate 111, and is not limited herein.
The light emitting unit 115 is disposed on the substrate 111, and different control modes of the control circuit 112 on the light emitting unit 115 can be realized by the arrangement and connection of the light emitting unit 115 and the control circuit 112, so as to regulate and control the light emitting condition of the light emitting unit 115.
Optionally, the light-emitting unit 115 includes a plurality of sub-light-emitting units 1151, and by designing the layout positions among the plurality of sub-light-emitting units 1151, the light-emitting area of the light-emitting unit 115 can be adjusted and controlled, so as to meet different backlight requirements; meanwhile, the electrical connection between each sub-light emitting unit 1151 and the control circuit 112 can be adjusted according to design requirements, so as to simplify circuit wiring and control methods.
The sub-light emitting unit 1151 includes a light emitting device 1152, the light emitting device 1152 includes one or more light emitting elements, and the plurality of light emitting elements are connected in series and used as a light source for the backlight panel 110. The arrangement mode and the arrangement position of the light emitting elements can be designed in a matching manner according to different backlight requirements, so that the applicability of the backlight panel 110 is improved.
It should be noted that, in the embodiment of the present application, the light emitting element is an LED lamp, and the LED lamp may include different colors, and the use requirements of different backlight light sources can be met by adjusting the number, the color, and the arrangement manner of the LED lamps.
The sub light emitting unit 1151 includes a first control switch 1153, and the first control switch 1153 is connected in series with the light emitting device 1152 between the first power signal line 113 and the second power signal line 114 for controlling whether or not current is conducted in the light emitting device 1152. The first power signal line 113 and the second power signal line 114 may provide a dc signal to the plurality of sub-light emitting units 1151, so as to turn on the light emitting devices 1152 and the first control switches 1153 in the sub-light emitting units 1151, and by designing a connection manner between the first control switches 1153 and the light emitting devices 1152, a current direction in the light emitting devices 1152 may be changed, so that layouts of the first power signal line 113 and the second power signal line 114 are designed, and optimization of routing on the substrate 111 of the backlight lamp panel 110 is achieved.
The control circuit 112 is electrically connected to the first control switch 1153, and the first control switch 1153 can be controlled to be turned on or off by adjusting a control signal in the control circuit 112, so as to control whether a current in the light emitting device 1152 is turned on or not, thereby controlling the light emitting condition of the sub light emitting unit 1151.
It should be noted that the control circuit 112 includes a scan driving line 1121, a data driving line 1122, and a second control switch 1123, wherein the scan driving line 1121 is electrically connected to a control end of the second control switch 1123 to control the second control switch 1123 to be turned on or off; the data driving line 1122 is electrically connected to an input terminal of the second control switch 1123, and an output terminal of the second control switch 1123 is electrically connected to a control terminal of the first control switch 1153, so as to control on/off of the first control switch 1153, thereby controlling whether the current in the light emitting device 1152 is on or off, and controlling the light emitting condition of the sub light emitting unit 1151.
The sub light emitting unit 1151 further includes a voltage dividing element 1154, and the voltage dividing element 1154 is connected between the first power supply signal line 113 and the second power supply signal line 114 in series with the light emitting device 1152 and the first control switch 1153. The voltage dividing element 1154 can occupy partial voltage on the line where the light emitting device 1152 and the first control switch 1153 are located, so that voltage and current at two ends of the light emitting device 1152 are adjusted to meet requirements of luminance of different sub-light emitting units 1151 of the backlight lamp panel 110.
The first power signal line 113 has an input end and an output end, and during the operation of the backlight panel 110, the potential of the input end is higher than that of the output end, that is, a voltage signal output by the first power signal line 113 is transmitted from the input end to the output end. Due to the existence of the resistance of the first power signal line 113, voltage drop occurs in the process of transmitting the voltage signal from the input end to the output end, so that the voltage or current at two ends of different sub-light emitting units 1151 has a large difference, and the overall brightness of the backlight panel 110 is not uniform, thereby affecting the display effect.
Optionally, the resistance of the voltage dividing element 1154 of the sub-light emitting unit 1151 is gradually decreased along the direction from the input end to the output end of the first power signal line 113, because the voltage and the current at the two ends of the sub-light emitting unit 1151 are gradually decreased along the direction from the input end to the output end of the first power signal line 113, through the adjustment of the resistance of the voltage dividing element 1154, the resistance of the voltage dividing element 1154 of the sub-light emitting unit 1151 close to the input end of the first power signal line 113 is greater than the resistance of the voltage dividing element 1154 of the sub-light emitting unit 1151 close to the output end of the first power signal line 113, so that the difference of the currents flowing through the two ends of different sub-light emitting units 1151 can be reduced, and the uniformity of the overall luminance of the backlight lamp panel 110 is improved.
In the embodiment of the application, the voltage dividing element 1154 is arranged in the sub-light emitting units 1151, and the resistance value of the voltage dividing element 1154 is gradually reduced along the direction from the input end to the output end of the first power signal line 113, so that the influence of internal resistance voltage drop caused by the resistance value of the first power signal line 113 is reduced, the current difference flowing through each sub-light emitting unit 1151 is reduced, and the uniformity of the whole light emitting brightness of the backlight lamp panel 110 is improved.
Alternatively, the light emitting device 1152, the first control switch 1153, and the voltage dividing element 1154 are sequentially connected in series between the first power signal and the second power signal, that is, an input terminal of the light emitting device 1152 is electrically connected to the first power signal line 113, an output terminal of the light emitting device 1152 is electrically connected to an input terminal of the first control switch 1153, an output terminal of the first control switch 1153 is electrically connected to an input terminal of the voltage dividing element 1154, and an output terminal of the voltage dividing element 1154 is electrically connected to the second power signal line 114. By adopting the connection mode, the resistance value of the voltage dividing element 1154 can be conveniently adjusted, and the influence on the control of whether the first control switch 1153 conducts or not to the current in the light emitting device 1152 when the resistance value of the voltage dividing element 1154 is adjusted and designed is avoided; meanwhile, the adoption of the connection mode facilitates the adjustment of the connection mode of the voltage dividing element 1154, the matching design among different sub-light emitting units 1151 and the wiring design on the backlight panel 110.
In some embodiments, the light emitting device 1152 is connected between the first control switch 1153 and the voltage dividing element 1154, i.e., an input terminal of the first control switch 1153 is electrically connected to the first power signal line 113, and an output terminal of the first control switch 1153 is electrically connected to an input terminal of the light emitting device 1152. An output terminal of the light emitting device 1152 is electrically connected to an input terminal of the voltage dividing element 1154, and an output terminal of the voltage dividing element 1154 is electrically connected to the second power signal line 114. By separating the first control switch 1153 from the voltage dividing element 1154 in this connection manner, it is possible to avoid influencing the conduction of the first control switch 1153 when the resistance value of the voltage dividing element 1154 is adjusted.
In other embodiments, the light emitting device 1152 is connected between the light emitting element 1154 and the second power supply signal line 114, that is, an input terminal of the first control switch 1153 is electrically connected to the first power supply signal line 113, an output terminal of the first control switch 1153 is electrically connected to an input terminal of the voltage dividing element 1154, an output terminal of the voltage dividing element 1154 is electrically connected to an input terminal of the light emitting device 1152, and an output terminal of the light emitting device 1152 is electrically connected to the second power supply signal line 114. By adopting the connection mode, the position relation among the light emitting devices 1152 of different sub-light emitting units 1151 can be adjusted conveniently, so that the light emitting area of the backlight lamp panel 110 can be regulated and controlled, and different light emitting requirements of the backlight lamp panel 110 can be met.
It should be noted that the connection order of the light emitting device 1152, the first control switch 1153, and the voltage dividing element 1154 between the first power signal line 113 and the second power signal line 114 can be adjusted according to design requirements, and it is only necessary to ensure that the setting of the voltage dividing element 1154 can improve the difference of the current flowing through each of the sub light emitting units 1151.
Optionally, the voltage dividing element 1154 includes a plurality of sub voltage dividing elements 1154a, and the adjustment range of the total resistance of the voltage dividing element 1154 can be enlarged by adjusting the connection mode between the plurality of sub voltage dividing elements 1154a, so as to meet the design requirement of large voltage or current difference between two ends of different sub light emitting units 1151, and further improve the uniformity of the overall luminance of the backlight lamp panel 110.
In some embodiments, at least some of the sub voltage dividing elements 1154a are connected in series, when designing and adjusting the resistance value of the voltage dividing element 1154, because the maximum resistance value of a single sub voltage dividing element 1154a is limited, when the overall resistance value of the voltage dividing element 1154 needs to be increased, the upper limit range of the resistance value adjustment of the voltage dividing element 1154 can be increased by connecting a plurality of sub voltage dividing elements 1154a in series, so as to meet the design requirement of the backlight lamp panel 110 in a wider range.
The sum of the resistances of the sub-voltage dividing elements 1154a gradually decreases along the direction from the input end to the output end of the first power signal line 113, so as to reduce the influence of internal resistance voltage drop caused by the resistance of the first power signal line 113 itself, reduce the current difference flowing through each sub-light emitting unit 1151, and improve the uniformity of the overall luminance of the backlight panel 110.
In other embodiments, at least some of the sub voltage dividing elements 1154a are connected in parallel, when designing and adjusting the resistance value of the voltage dividing element 1154, because the minimum resistance value of a single sub voltage dividing element 1154a is limited, when the overall resistance value of the voltage dividing element 1154 needs to be reduced, the lower limit range of the resistance value adjustment of the voltage dividing element 1154 can be increased by connecting a plurality of sub voltage dividing elements 1154a in parallel, so as to meet the design requirement of the backlight lamp panel 110 in a wider range.
The sum of the resistances of the sub-voltage dividing elements 1154a gradually decreases along the direction from the input end to the output end of the first power signal line 113, so as to reduce the influence of internal resistance voltage drop caused by the resistance of the first power signal line 113 itself, reduce the current difference flowing through each sub-light emitting unit 1151, and improve the uniformity of the overall luminance of the backlight panel 110.
It should be noted that the sub voltage dividing elements 1154a may adopt all serial connection modes, all parallel connection modes, or a combination of serial connection and parallel connection modes, and different connection modes of the sub voltage dividing elements 1154a can meet the requirements of different sub light emitting units 1151 of the backlight panel 110 for different voltage dividing adjustment ranges. The interconnection mode among the plurality of sub voltage division elements 1154a can be adjusted according to actual requirements, and only by ensuring that the setting of the voltage division element 1154 can reduce the influence of internal resistance voltage drop caused by the resistance value of the first power signal line 113 itself, the current difference flowing through each sub light emitting unit 1151 is reduced, and the uniformity of the whole luminance of the backlight panel 110 is improved.
Alternatively, in the embodiment of the present application, the light emitting device 1152 is connected between the first power source signal line 113 and the first control switch 1153, and the plurality of sub voltage dividing elements 1154a are connected between the first control switch 1153 and the second power source signal line 114. By adopting the connection mode, the mutual connection among the sub voltage division elements 1154a and the adjustment of the total resistance value of the voltage division element 1154 are facilitated, and the influence on the control of whether the first control switch 1153 conducts or not to the current in the light emitting device 1152 when the total resistance value of the voltage division element 1154 is adjusted is avoided; meanwhile, the adoption of such a connection mode facilitates the matching design between different sub-light emitting units 1151 and the wiring design on the backlight panel 110.
In some embodiments, the partial sub-voltage dividing element 1154a may also be connected between the first power signal line 113 and the light emitting device 1152, or connected between the light emitting device 1152 and the first control switch 1153, and a connection manner between the sub-voltage dividing elements 1154a connected at the same interval position may also be adjusted according to design requirements, where no limitation is imposed, only by ensuring that the current difference of each sub-light emitting unit 1151 can be reduced through the overall arrangement of the plurality of sub-voltage dividing elements 1154a, and improving the uniformity of the overall light emitting brightness of the backlight lamp panel 110.
Optionally, in this embodiment of the application, the voltage dividing element 1154 includes a first thin film transistor or a resistor, or includes a first thin film transistor and a resistor at the same time, the specific components of the voltage dividing element 1154 and the connection manner between the components may be adjusted accordingly according to actual design requirements, and it is only necessary to ensure that the setting of the voltage dividing element 1154 can reduce the current difference of each sub-light emitting unit 1151, and improve the uniformity of the overall luminance of the backlight panel 110.
Alternatively, the voltage dividing element 1154 includes a first thin film transistor, an input terminal of which is electrically connected to an output terminal of the first control switch 1153, and an output terminal of which is electrically connected to the second power supply signal line 114. The resistance value of the first thin film transistor is directly related to the width-length ratio W/L of the channel of the first thin film transistor, and when the width-length ratio W/L is larger, the resistance value of the first thin film transistor is smaller; in addition, the resistance value of the first thin film transistor is not fixed and is also related to the charging voltage of the control end of the first thin film transistor in the working process, and when the charging voltage is larger, the resistance value of the first thin film transistor is smaller.
The voltage dividing element 1154 is set as the first thin film transistor, the resistance value of the voltage dividing element 1154 is designed according to the channel width-length ratio W/L of the first thin film transistor in the manufacturing process, and the resistance value of the voltage dividing element 1154 can be adjusted in real time through the change of the charging voltage of the control end of the first thin film transistor according to actual requirements in the using process, so that the resistance value adjusting requirements of different sub-light emitting units 1151 of the backlight lamp panel 110 are met, and the using range of the backlight lamp panel 110 is expanded.
In some embodiments, the voltage dividing element 1154 is a first thin film transistor, and a control terminal of the first thin film transistor is electrically connected to the first power signal line 113, an input terminal of the first thin film transistor is electrically connected to an output terminal of the first control switch 1153, an output terminal of the first thin film transistor is electrically connected to the second power signal line 114, and the light emitting device 1152 is connected between the first power signal line 113 and the first control switch 1153. That is, the turning on or off of the first thin film transistor is directly controlled by the output voltage signal of the first power signal line 113, and at the same time, the magnitude of the output voltage of the first power signal line 113 directly affects the resistance value of the first thin film transistor.
When the internal resistance voltage drop of the sub-light emitting unit 1151 is large, the output voltage of the first power signal line 113 may be increased, or the channel width-to-length ratio W/L of the first thin film transistor may be increased, so as to increase the current flowing through the sub-light emitting unit 1151 and improve the uniformity of the overall luminance of the backlight panel 110.
In other embodiments, the voltage dividing element 1154 includes a first thin film transistor, the first control switch 1153 includes a second thin film transistor, and a control terminal of the first thin film transistor is electrically connected to a control terminal of the second thin film transistor, an input terminal of the first thin film transistor is electrically connected to an output terminal of the second thin film transistor, an output terminal of the first thin film transistor is electrically connected to the second power signal line 114, and the light emitting device 1152 is connected between the first power signal line 113 and the second thin film transistor. That is, the first thin film transistor and the second thin film transistor are connected in series, and the on/off states of the first thin film transistor and the second thin film transistor are controlled by the data driving line 1122 in the control circuit 112, and meanwhile, the magnitude of the output voltage of the data driving line 1122 also directly affects the resistance values of the first thin film transistor and the second thin film transistor.
When the internal resistance voltage drop of the sub-light emitting unit 1151 is large, the output voltage of the data driving line 1122 may be increased, or the channel width-to-length ratio W/L of the first thin film transistor or the second thin film transistor may be increased, so as to increase the current flowing through the sub-light emitting unit 1151 and improve the uniformity of the overall luminance of the backlight panel 110.
When the resistance of the first thin film transistor is adjusted by adjusting the output voltage of the data driving line 1122, the influence of the output voltage of the data driving line 1122 on the second thin film transistor needs to be considered, that is, the output voltage of the data driving line 1122 needs to be ensured to turn on the second thin film transistor and the first thin film transistor, so as to ensure that a current flows in the sub light emitting unit 1151.
Optionally, besides the first thin film transistor, a resistor can be directly used as the voltage dividing element 1154, that is, before the backlight lamp panel 110 is manufactured, internal resistance voltage drops of different sub-light emitting units 1151 are calculated according to test data, the resistance value of the voltage dividing element 1154 to which each sub-light emitting unit 1151 needs to be connected is determined, and then the resistor with the corresponding size is connected to the circuit of each sub-light emitting unit 1151. The resistor is used as the voltage dividing element 1154, so that the stability of the resistance value of the access resistor can be ensured, and the fluctuation of the resistance value of the voltage dividing element 1154 caused by the fluctuation of the output voltage of the first power signal line 113 or the data driving line 1122 is avoided, so that the fluctuation of the current flowing through the sub-light emitting unit 1151 is avoided, and the light emitting stability of the backlight lamp panel 110 is influenced.
Optionally, the voltage dividing element 1154 is composed of a plurality of resistors, and the adjustment range of the total resistance of the voltage dividing element 1154 can be enlarged by adjusting the connection mode among the plurality of resistors, so as to meet the design requirement of large voltage or current difference at two ends of different sub-light emitting units 1151, and further improve the uniformity of the overall light emitting brightness of the backlight lamp panel 110.
In some embodiments, at least some of the resistors are connected in series, when designing and adjusting the resistance value of the voltage dividing element 1154, considering the influence of the manufacturing process, the maximum resistance value of a single resistor is limited, and when the overall resistance value of the voltage dividing element 1154 needs to be increased, a mode of connecting a plurality of resistors in series may be adopted to increase the upper limit range of the adjustment of the resistance value of the voltage dividing element 1154, so as to meet the design requirement of the backlight lamp panel 110 for a larger inner resistance voltage drop adjustment range.
In other embodiments, at least some of the resistors are connected in parallel, when designing and adjusting the resistance value of the voltage dividing element 1154, considering the influence of the manufacturing process, the minimum resistance value of a single resistor is also limited, and when the overall resistance value of the voltage dividing element 1154 needs to be continuously reduced, a mode of connecting a plurality of resistors in parallel can be adopted to increase the lower limit range of the adjustment of the resistance value of the voltage dividing element 1154, so as to meet the design requirement of the backlight lamp panel 110 for a larger inner resistance voltage drop adjustment range.
It should be noted that, the plurality of resistors may be connected in all series, may be connected in all parallel, and may also be connected in a combination of series and parallel, which is not limited herein. The mode of interconnection between a plurality of resistances can be adjusted according to actual needs, and it is only necessary to ensure that the setting of the voltage dividing element 1154 can reduce the influence of internal resistance voltage drop caused by the self resistance of the first power signal line 113, so that the current difference flowing through each sub-light emitting unit 1151 is reduced, and the uniformity of the overall brightness of the backlight lamp panel 110 is improved.
Since the resistance of the resistor itself is stable and will not change due to the fluctuation of the output voltage of the first power signal line 113 or the data driving line 1122, the setting position of the resistor can be adjusted according to actual requirements, that is, the resistor can be connected between the first power signal line 113 and the light emitting device 1152, or between the light emitting device 1152 and the first control switch 1153, or between the first control switch 1153 and the second power signal line 114, which is not limited herein.
Optionally, the voltage dividing element 1154 in the embodiment of the present application includes a plurality of first thin film transistors and a plurality of resistors, that is, the voltage dividing element 1154 is formed by hybrid connection of the first thin film transistors and the resistors, and at least one of the first thin film transistors and at least one of the resistors are connected in series between the first control switch 1153 and the second power signal line 114, so as to reduce a difference in current flowing through each of the sub light emitting units 1151.
When the resistance value of the voltage dividing element 1154 is designed and adjusted, considering the influence of the manufacturing process, the maximum resistance value of a single first thin film transistor or a resistor is limited, when the overall resistance value of the voltage dividing element 1154 needs to be increased continuously, and in the process of the previous test verification, when the internal resistance voltage drop range of each sub-light emitting unit 1151 is preliminarily determined, the mode of connecting the first thin film transistor and the resistor in series can be adopted, so that the upper limit range of the resistance value adjustment of the voltage dividing element 1154 can be increased, the adjustment requirement on the first thin film transistor can be reduced, the manufacturing process is simplified, and the production cost is reduced.
Optionally, the voltage dividing element 1154 in this embodiment of the application includes a plurality of first thin film transistors and a plurality of resistors, and at least one of the first thin film transistors and at least one of the resistors are connected in parallel between the first control switch 1153 and the second power signal line 114, so as to reduce a current difference flowing through each sub-light emitting unit 1151, and improve uniformity of overall light emission of the backlight panel 110.
When the resistance value of the voltage dividing element 1154 is designed and adjusted, considering the influence of the manufacturing process, the minimum resistance value of a single first thin film transistor or a resistor is limited, when the overall resistance value of the voltage dividing element 1154 needs to be continuously reduced, and in the process of the previous test verification, when the internal resistance voltage drop range of each sub-light emitting unit 1151 is preliminarily determined, the first thin film transistor and the resistor can be connected in parallel, so that the lower limit range of the resistance value adjustment of the voltage dividing element 1154 can be enlarged, the adjustment requirement on the first thin film transistor can be reduced, the manufacturing process is simplified, and the production cost is reduced.
Secondly, this application embodiment also provides a backlight module, and this backlight module includes the backlight lamp plate, and the specific structure of this backlight lamp plate refers to above-mentioned embodiment, because this backlight module has adopted all technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least. And will not be described in detail herein.
Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure, and as shown in fig. 2, the backlight module 100 includes a back plate 120, a backlight panel 110, and an optical diaphragm set 130, where the backlight panel 110 is disposed on the back plate 120, and the optical diaphragm set 130 is stacked on the backlight panel 110. The back plate 120 may be provided with a plurality of backlight panels 110 in a splicing manner, so as to avoid an excessively large area of a single backlight panel 110 and reduce the difficulty of the manufacturing process.
It should be noted that a groove may be disposed on the back plate 120, the backlight panel 110 and the optical film set 130 are disposed in the groove, and the groove structure is helpful to limit the positions of the back plate 120 and the optical film set 130, so as to facilitate the assembly of the backlight module 100.
Finally, the embodiment of the present application further provides a display device, which includes a backlight module, and the specific structure of the backlight module refers to the above embodiments. And will not be described in detail herein.
Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present disclosure, and as shown in fig. 3, the display device 10 includes a backlight module 100, a display panel 200, a driving circuit 300, and a housing 400. The display panel 200 is located at the light-emitting side of the backlight module 100, and the backlight module 100 can emit light uniformly in the whole light-emitting surface, so as to provide light with brightness reorganization and uniform distribution for the display panel 200, so that the display panel 200 can normally display images. The housing 400 is connected with the display panel 200 to support and fix the display panel 200, the driving circuit 300 is disposed in the housing 400, and the driving circuit 300 is electrically connected with the display panel 200 to control the display panel 200 to display images.
In the embodiment of the present invention, the display device 10 may be any product or component having a display function, such as a mobile phone, a computer, a digital camera, a digital video camera, a game machine, an audio reproducing device, an information terminal, an intelligent wearable device, an intelligent weighing electronic scale, a vehicle-mounted display, and a television.
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 panel, the backlight module and the 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 understand the method and the core idea of 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. The utility model provides a backlight plate which characterized in that, backlight plate includes:
a substrate on which a control circuit, a first power supply signal line, and a second power supply signal line are disposed;
a light emitting unit disposed on the substrate, the light emitting unit including a plurality of sub light emitting units including a light emitting device, a first control switch, and a voltage dividing element, the light emitting device, the first control switch, and the voltage dividing element being connected in series between the first power signal line and the second power signal line; the control circuit is electrically connected with the first control switch to control the first control switch to be switched on or switched off;
the resistance value of the voltage dividing element of the sub light emitting unit is gradually decreased in a direction from the input terminal to the output terminal of the first power signal line.
2. The backlight panel of claim 1, wherein the light emitting device, the first control switch, and the voltage dividing element are sequentially connected in series between the first power signal line and the second power signal line.
3. The backlight panel of claim 1, wherein the voltage dividing element comprises a plurality of sub voltage dividing elements, at least some of which are connected in series; and/or at least part of the sub voltage dividing elements are connected in parallel;
the sum of the resistance values of the plurality of sub voltage-dividing elements gradually decreases in a direction from the input terminal to the output terminal of the first power signal line.
4. The backlight panel of claim 3, wherein the light emitting device is connected between the first power signal line and the first control switch, and the plurality of sub-voltage dividing elements are connected between the first control switch and the second power signal line.
5. The backlight panel of claim 1, wherein the voltage divider comprises a first thin film transistor and/or a resistor.
6. The backlight panel of claim 5, wherein an input terminal of the first thin film transistor is electrically connected to an output terminal of the first control switch, an output terminal of the first thin film transistor is electrically connected to the second power signal line, and a control terminal of the first thin film transistor is electrically connected to the first power signal line.
7. The backlight panel of claim 5, wherein the first control switch comprises a second thin film transistor, an input terminal of the first thin film transistor is electrically connected to an output terminal of the second thin film transistor, an output terminal of the first thin film transistor is electrically connected to the second power signal line, and a control terminal of the first thin film transistor is electrically connected to a control terminal of the second thin film transistor.
8. The backlight panel of claim 5, wherein the voltage divider comprises a plurality of the first thin film transistors and a plurality of the resistors;
at least one of the first thin film transistors and at least one of the resistors are connected in series between the first control switch and the second power supply signal line; and/or the presence of a gas in the gas,
at least one of the first thin film transistors and at least one of the resistors are connected in parallel between the first control switch and the second power supply signal line.
9. A backlight module characterized in that the backlight module comprises the backlight panel of any one of claims 1 to 8.
10. A display device, characterized in that the display device comprises the backlight module according to claim 9.
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| CN202110611783.7A CN113421499A (en) | 2021-06-02 | 2021-06-02 | Backlight panel, backlight module and display device |
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| CN202110611783.7A CN113421499A (en) | 2021-06-02 | 2021-06-02 | Backlight panel, backlight module and display device |
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Application publication date: 20210921 |