CN117075390A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN117075390A CN117075390A CN202311255701.5A CN202311255701A CN117075390A CN 117075390 A CN117075390 A CN 117075390A CN 202311255701 A CN202311255701 A CN 202311255701A CN 117075390 A CN117075390 A CN 117075390A
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 11
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133628—Illuminating devices with cooling means
Abstract
The application provides a backlight module and a display device, and relates to the technical field of display, wherein the backlight module comprises a back plate, a light emitting unit, a light sensor, a thermoelectric conversion module and a controller; by disposing the photosensor on the back plate, the luminance of the light emitting unit can be detected; the thermoelectric conversion module is arranged on the backboard, so that the heat energy of the backlight module can be converted into electric energy; the controller is electrically connected with the light sensor and the thermoelectric conversion module respectively, so that the controller can utilize the electric energy converted by the thermoelectric conversion module to carry out brightness compensation on the light-emitting unit under the condition that the brightness detected by the light sensor is lower than the target brightness. The technical scheme provided by the application can improve the brightness uniformity of the backlight module.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a backlight module and a display device.
Background
The liquid crystal display device consists of a liquid crystal display panel and a backlight module, and the liquid crystal display panel is a passive light-emitting element, and a light source with sufficient brightness and uniform distribution is provided for the liquid crystal display panel through the backlight module, so that the liquid crystal display panel can normally display images, and the light-emitting effect of the backlight module directly influences the display effect of the liquid crystal display panel.
The light emitting diode (Light Emitting Diode, LED) has the advantages of environmental protection, energy saving, long service life, thin thickness and the like, and the LED backlight module is widely applied to liquid crystal display devices.
However, the light emission brightness of the LED may decrease with an increase in temperature, thereby causing a fluctuation in display brightness of the liquid crystal display panel, affecting display quality.
Disclosure of Invention
In view of the above, the present application provides a backlight module and a display device for improving the brightness stability of the backlight module.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a backlight module, including: the device comprises a back plate, a light emitting unit, a light sensor, a thermoelectric conversion module and a controller; the light emitting unit, the light sensor and the thermoelectric conversion module are arranged on the back plate;
the light sensor is used for detecting the brightness of the light-emitting unit;
the thermoelectric conversion module is used for converting heat energy of the backlight module into electric energy;
the controller is electrically connected with the light sensor and the thermoelectric conversion module respectively, and is used for performing brightness compensation on the light emitting unit by utilizing the electric energy converted by the thermoelectric conversion module under the condition that the brightness detected by the light sensor is lower than the target brightness.
In a possible implementation manner of the first aspect, the thermoelectric conversion module is disposed on an outer wall of the back plate;
the thermoelectric conversion module comprises a hot end insulating layer arranged on the outer wall of the backboard, a cold end insulating layer arranged opposite to the hot end insulating layer, and a thermoelectric power generation assembly clamped between the hot end insulating layer and the cold end insulating layer.
In a possible implementation manner of the first aspect, the thermoelectric generation assembly includes a plurality of semiconductor assemblies arranged in an array, each semiconductor assembly includes a P-type semiconductor and an N-type semiconductor, and the P-type semiconductor and the N-type semiconductor in the same semiconductor assembly are connected in series through a first metal sheet disposed on the hot end insulating layer; each semiconductor assembly is connected in series by a second metal sheet spaced above the cold end insulating layer.
In a possible implementation manner of the first aspect, each of the first metal sheets is formed by a copper layer plated on the hot end insulating layer, and each of the second metal sheets is formed by a copper layer plated on the cold end insulating layer.
In a possible implementation manner of the first aspect, the backlight module further includes a fan, where the fan is configured to dissipate heat from the cold end insulating layer;
the controller is electrically connected with the fan, and the controller is further used for: controlling the fan to rotate at a first rotation speed under the condition that the brightness detected by the light sensor is lower than the target brightness; and controlling the fan to rotate at a second rotation speed under the condition that the brightness of the light sensor is not lower than the target brightness, wherein the first rotation speed is higher than the second rotation speed.
In a possible implementation manner of the first aspect, the controller is further configured to output the electric energy converted by the thermoelectric conversion module to the blower in a case where a brightness of the light sensor is not lower than the target brightness.
In a possible implementation manner of the first aspect, the fans include a plurality of fans, and each fan is used for radiating heat from a different light-emitting area; each light emitting area is correspondingly provided with the light sensor;
the controller is electrically connected with the light sensors respectively and is used for controlling the brightness of the light emitting units in the light emitting areas and the rotating speed of the fans corresponding to the light emitting areas according to the brightness detected by the light sensors corresponding to the light emitting areas for each light emitting area.
In a possible implementation manner of the first aspect, the backlight module further includes a heat sink, and the cold end insulating layer is fixed on a bottom plate of the heat sink;
one side of the bottom plate of the radiator, which is far away from the cold end insulating layer, is provided with a plurality of radiating fins arranged at intervals, each radiating fin is provided with a through hole for fixing a heat pipe, and the heat pipe is connected with each radiating fin through the through hole.
In a possible implementation manner of the first aspect, the backlight module further includes an energy storage module;
the controller is electrically connected with the energy storage module, and is further configured to store the electric energy converted by the thermoelectric conversion module in the energy storage module when the brightness detected by the light sensor is not lower than the target brightness.
In a second aspect, an embodiment of the present application provides a display device including: a liquid crystal display panel and a backlight module according to the first aspect or any one of the possible implementation manners of the first aspect.
The embodiment of the application provides a backlight module, which comprises a back plate, a light emitting unit, a light sensor, a thermoelectric conversion module and a controller, wherein the light emitting unit, the light sensor and the thermoelectric conversion module are arranged on the back plate; the light sensor can detect the brightness of the light emitting unit, the thermoelectric conversion module can convert the heat energy of the backlight module into electric energy, the controller is respectively electrically connected with the light sensor and the thermoelectric conversion module, and the electric energy converted by the thermoelectric conversion module can be used for carrying out brightness compensation on the light emitting unit under the condition that the brightness detected by the light sensor is lower than the target brightness, so that the brightness uniformity of the backlight module can be improved, and the power consumption can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a thermoelectric conversion module according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a heat absorption side of a thermoelectric generation assembly according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an heat-releasing side of a thermoelectric generation assembly according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an outer wall of a back plate according to an embodiment of the present application.
Reference numerals illustrate:
100-a display panel; 200-a backlight module; 210-a back plate; 211-a bottom plate; 212-side plates; 220 a light emitting unit; 230-an optical component; 300-a light sensor; 400-a thermoelectric conversion module; 410-a hot end insulating layer; 420 cold end insulating layer; 430—a thermoelectric generation assembly; 431-semiconductor component; 4311-P-type semiconductor; 4312-N type semiconductor; 432-a first metal sheet; 433-a second metal sheet; 500-fans; 600-heat sink; 610-a heat sink base plate; 620-heat sink; 630-heat pipe.
Detailed Description
Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The terminology used in the description of the embodiments of the application is for the purpose of describing particular embodiments of the application only and is not intended to be limiting of the application. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
The display effect of the display panel is directly related to the use experience of a user, and the unstable backlight brightness provided by the backlight module can lead to the occurrence of bright and dark flicker of the display panel, so that the display quality is reduced, and the use experience of the user is reduced.
In view of the above, the embodiment of the application provides a backlight module for improving the brightness stability of the backlight module. The backlight module can comprise a back plate, a light emitting unit, a light sensor, a thermoelectric conversion module and a controller. The light emitting unit, the light sensor, and the thermoelectric conversion module may be disposed on the back plate. The light sensor may be used to detect the brightness of the light emitting unit. The thermoelectric conversion module can be used for converting heat energy of the backlight module into electric energy. The controller may be electrically connected to the light sensor and the thermoelectric conversion module, respectively, for performing brightness compensation on the light emitting unit using the electric energy converted by the thermoelectric conversion module in case that the brightness detected by the light sensor is lower than the target brightness.
The application is further described below with reference to the drawings and embodiments.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application, as shown in fig. 1, a display panel 100 may perform a picture display, and a display quality is related to a quality of a backlight source of the backlight module 200. The backlight module 200 may include a back plate 210, a light emitting unit 220, and an optical assembly 230.
Wherein the back plate 210 may include a bottom plate 211 and a side plate 212 disposed around an edge of the bottom plate 211, the side plate 212 may provide support for the optical assembly 230 such that a cavity exists between the optical assembly 230 and the bottom plate 211. A plurality of light emitting units 220 are disposed in the cavity, and the light emitting units 220 may be disposed on an inner wall of the bottom plate 211 of the back plate 210, and may convert electric energy into a backlight light source of the backlight module 200 under the driving of the driving current. The optical assembly 230 may convert the backlight light source into a surface light source that may be used for display of the display panel 100.
The light emitting units 220 may be fixed on the back plate 210 in the form of light bars, or may be fixed on the back plate 210 in the form of an array, wherein the fixing manner may be gluing, or may be other manners, which is not particularly limited in the present application.
The light emitting unit 220 may be a light emitting diode (Light Emitting Diode, LED), or may be other types of LEDs, such as a sub-millimeter light emitting diode (Mini Light Emitting Diode, mini LED) or a Micro light emitting diode (Micro Light Emitting Diode, micro LED), which is not particularly limited in the present application.
The light emitting unit 220 may emit light under the driving of the driving current, and generates heat energy during the light emission process, thereby increasing the temperature of the backlight module 200. After the temperature of the backlight module 200 increases, especially when the operating temperature of the light emitting unit 220 exceeds the carrying temperature of the chip inside the light emitting unit 220, the light emitting efficiency of the light emitting unit 220 is rapidly reduced, and obvious light attenuation is generated, so that the brightness of the backlight source of the backlight module 200 is fluctuated, and the aging of the light emitting unit 220 is accelerated.
To detect the brightness of the light emitting unit 220, the light sensor 300 may be fixed to the inner wall of the back plate 210, and detect the brightness of the light emitting unit 220 when the light emitting unit 220 emits light. In some embodiments, the light sensor 300 may further include a plurality of light sensors for detecting the brightness of different light emitting areas of the backlight module 200.
It can be appreciated that the light sensor 300 can detect the brightness of the light emitting unit 220 in real time, so as to improve the timeliness of the detection result. The light sensor 300 may also detect the brightness of the light emitting unit 220 at regular time, thereby reducing power consumption.
In order to avoid waste of heat energy, the backlight module 200 may include a thermoelectric conversion module 400, and the thermoelectric conversion module 400 may convert the heat energy of the backlight module 200 into electric energy, thereby improving the energy utilization rate of the backlight module 200. The thermoelectric conversion module 400 may be disposed on the outer wall of the back plate 210, for example, since the temperature of the bottom plate 211 is high, the thermoelectric conversion module 400 may be fixed on the outer wall of the bottom plate 211 by bolting, gluing, or the like, so that the reliability of the thermoelectric conversion module 400 may be improved.
It can be understood that, in fig. 1, a direct type backlight module is taken as a schematic diagram, and the backlight module provided in the embodiment of the application may also be applied to a side-entry type backlight module. In addition, the structure in fig. 1 is only a schematic view, and is only used to indicate the positional relationship of the components in the backlight module 200, and in an actual product, the backlight module 200 may include more components than those shown in the drawing.
Fig. 2 is a schematic structural diagram of a thermoelectric conversion module according to an embodiment of the present application, and as shown in fig. 2, the thermoelectric conversion module 400 may include a hot-side insulating layer 410 disposed on an outer wall of the back plate 210, a cold-side insulating layer 420 disposed opposite to the hot-side insulating layer 410, and a thermoelectric generation assembly 430 interposed between the hot-side insulating layer 410 and the cold-side insulating layer 420. The back plate 210 of the backlight module 200 has a higher temperature, the side of the hot end insulating layer 410 may be a heat absorbing side of the thermoelectric generation assembly 430, and the side of the cold end insulating layer 420 may be a heat releasing side of the thermoelectric generation assembly 430.
Fig. 3 is a schematic structural diagram of a heat absorbing side of a thermoelectric generation assembly according to an embodiment of the present application. Fig. 4 is a schematic structural diagram of an heat-releasing side of a thermoelectric generation assembly according to an embodiment of the present application. Referring to fig. 2 to 4, the thermoelectric generation element 430 may include a plurality of semiconductor elements 431 arranged in an array, each semiconductor element 431 includes a P-type semiconductor 4311 and an N-type semiconductor 4312, and the P-type semiconductor 4311 and the N-type semiconductor 4312 in the same semiconductor element 431 are connected in series through a first metal sheet 432 disposed on the hot end insulating layer 410. Each semiconductor assembly 431 is connected in series by a second metal sheet 433 spaced above the cold end insulating layer 420.
Taking one semiconductor element 431 as an example, one end of the P-type semiconductor 4311 and one end of the N-type semiconductor 4312 close to the heat absorbing side are hot ends, and one end close to the heat releasing side is cold end, so that a temperature difference exists between the two ends of the P-type semiconductor 4311 and the N-type semiconductor 4312. Because the thermal excitation effect of the hot end is stronger, the concentration of carriers (holes and electrons) is higher than that of the cold end, and the holes and electrons move to the cold end under the driving of the concentration gradient of the carriers, so that potential difference is formed at the cold end.
The plurality of semiconductor assemblies 431 are connected in series through connection terminals (not shown in the drawing) provided on the second metal sheets 433 at both ends of the thermoelectric generation assembly 430, and a series superposition effect of the potential differences is achieved, so that the conversion of the heat energy of the backlight module 200 into the electric energy can be achieved.
In some embodiments, the thermoelectric generation assembly 430 may be directly fixed on the outer wall of the back plate 210, so that the hot end insulating layer 410 is not required to be prepared, the cost is reduced, and the temperature difference between the hot end and the cold end of the thermoelectric generation assembly 430 is improved.
The hot end insulating layer 410 may be first prepared on the outer wall of the back plate 210, and the hot end insulating layer 410 may be made of ceramic powder, aluminum silicon hydrochloric acid mineral powder, or the like. Each of the first metal sheets 432 may be formed by plating a copper layer on the hot terminal insulating layer 410, so that connection reliability and conductivity of the first metal sheets 432 are improved. After the first metal sheets 432 are formed, the P-type semiconductor 4311 and the N-type semiconductor 4312 may be mounted on each of the first metal sheets 432 using a surface mount technology (Surface Mount Technology, SMT). By adopting the SMT technique, the assembly efficiency can be improved.
Referring to fig. 4, after the P-type semiconductor 4311 and the N-type semiconductor 4312 are mounted on the first metal sheet 432, a second metal sheet 433 may be disposed on the P-type semiconductor 4311 and the N-type semiconductor 4312 correspondingly. The cold side insulating layer 420 may be the same material as the hot side insulating layer 410, thereby reducing manufacturing complexity. Each second metal sheet 433 may be formed by plating a copper layer on the cold end insulating layer 420, so that connection reliability and conductivity of the second metal sheet 433 may be improved. Each of the semiconductor elements 431 is connected in series by the first metal sheet 432 on the heat absorbing side and the second metal sheet 433 on the heat releasing side, thereby forming the thermoelectric generation element 430.
In some embodiments, the P-type semiconductor 4311 and the N-type semiconductor 4312 may be soldered on the first metal sheet 432 and the second metal sheet 433. In other embodiments, the P-type semiconductor 4311 and the N-type semiconductor 4312 may be connected to the first metal sheet 432 and the second metal sheet 433 by a high temperature resistant conductive paste, thereby reducing process complexity and improving connection conductivity.
The P-type semiconductor 4311 may be made of a hole-rich material, for example, bismuth telluride may be doped with antimony telluride. The N-type semiconductor 4312 may be made of an electron rich material, for example, a mixed material of bismuth telluride and bismuth selenide may be selected. It is understood that the P-type semiconductor 4311 and the N-type semiconductor 4312 may be made of other materials, and the embodiment of the present application is not particularly limited herein.
In addition, in the P-type semiconductor 4311 and the N-type semiconductor 4312, an endothermic phenomenon occurs when electrons transit from the cold side to the hot side, thereby absorbing heat of the back plate 210. When electrons diffuse from the hot end to the cold end, an exothermic phenomenon occurs, and heat of the hot end is released. Through the above embodiment, the present application can utilize the movement of the carriers to generate electric energy, and can reduce the temperature of the back plate 210 to dissipate heat of the backlight module 200.
The controller (not shown) may be disposed at any position of the backlight module and may be connected with the light sensor 300 and the thermoelectric conversion module 400 by a wired connection or a wireless connection, respectively. The controller may acquire the luminance of the light emitting unit 220 detected by the light sensor 300, compare the luminance with a target luminance, and compensate the luminance of the light emitting unit 220 using the power converted by the thermoelectric conversion module 400 in case the luminance is lower than the target luminance. The target brightness is the light-emitting brightness corresponding to the current driving current.
In one possible implementation, considering that there is generally a linear relationship between the luminance of the light emitting unit 220 and the driving current, that is, as the driving current increases, the luminance of the light emitting unit 220 also increases. The controller may increase the driving current of the light emitting unit 220 having a darker brightness such that the brightness of the light emitting unit 220 increases, which may reduce the complexity of brightness compensation.
In some embodiments, the thermoelectric conversion module 400 may output power to a controller, which provides power to the light emitting unit 220 according to a relationship between brightness and driving current. For example, in order to improve the accuracy of the controller to supply the power to the light emitting unit, a temperature sensor may be further provided in the backlight module 200 for detecting the temperature of the backlight module 200. The controller acquires the luminance detected by the light sensor 300 and the temperature detected by the temperature sensor, and according to the correspondence between the luminance and the current required for the light emitting unit 220 at the temperature to reach the target luminance, which is stored in the controller in advance, the controller outputs a corresponding compensation current to the light emitting unit.
In other embodiments, the thermoelectric conversion module 400 may output power to other circuit modules, such as a power compensation module, and the controller may provide compensation power to the light emitting unit through the power compensation module.
In another possible implementation, the controller may also increase the on-off time ratio of the light emitting unit 220, i.e., change the pulse width of the light emitting unit 220 to increase the brightness, so that the power consumption of brightness compensation may be reduced. Illustratively, the thermoelectric conversion module 400 outputs electric power to a controller, and the controller increases a duty ratio in a driving current output from the driving circuit using the electric power converted by the thermoelectric conversion module 400 according to a difference between the luminance of the light emitting unit 220 and the target luminance, thereby adjusting the luminance of the light emitting unit 220.
The controller may be powered by the backlight module 200. Considering that the light emitting unit 220 generates heat energy only in a light emitting state, so that there is a temperature difference between the two ends of the P-type semiconductor 4311 and the N-type semiconductor 4312, the temperature of the backlight module 200 can be converted into electric energy. Therefore, the controller may be powered by the thermoelectric conversion module 400, so that the controller may operate when the light emitting unit 220 emits light, thereby not only reducing power consumption, but also improving the utilization rate of electric energy.
The light sensor 300 may also be powered by the thermoelectric conversion module 400, so that the light sensor 300 may be in an operating state when the light emitting unit 220 is in a light emitting state, thereby reducing the duration of the operation of the light sensor 300 and prolonging the service life of the light sensor 300.
Further, fig. 5 is a schematic structural diagram of an outer wall of the back plate according to an embodiment of the present application. Considering that the heat absorption amount of electrons increases with an increase in the temperature difference between the hot side and the cold side in the P-type semiconductor 4311 and the N-type semiconductor 4312, that is, the larger the temperature difference, the larger the power generation amount of the thermoelectric conversion module 400.
As shown in fig. 5, the backlight module 200 may further include a blower 500, and the blower 500 may be used to dissipate heat from the cold end insulating layer 420. The controller may be electrically connected to the blower 500 by a wired connection or a wireless connection, and may be further configured to control the blower 500 to rotate at the first rotation speed in case the brightness detected by the light sensor 300 is lower than the target brightness. In the case that the brightness of the light sensor 300 is not lower than the target brightness, the blower 500 is controlled to rotate at a second rotation speed, which is greater than the second rotation speed.
Illustratively, the controller controls the fan 500 to rotate at the first rotation speed, so that the cold-end insulating layer 420 can be cooled, and thus the thermoelectric conversion module 400 can not only convert heat energy into electric energy, but also cool the backlight module 200. In some embodiments, the first rotational speed may be zero.
In the case where the luminance detected by the light sensor 300 is lower than the target luminance, it is indicated that the light emitting unit is light-decaying at this time. The controller may control the fan 500 to rotate at the second rotation speed, thereby increasing the rotation speed of the fan 500, reducing the temperature of the cold end, and further increasing the temperature difference between the hot end and the cold end, so that the thermoelectric conversion module 400 generates more electric energy, so that the controller may utilize the electric energy to perform brightness compensation on the light emitting unit 220.
The controller may also be used to output the electric energy converted by the thermoelectric conversion module 400 to the blower 500 when the brightness of the light sensor 300 is not lower than the target brightness, so that the blower 500 may operate only when the temperature of the backlight module 200 is increased, thereby not only reducing power consumption, but also improving the utilization rate of the electric energy.
In some embodiments, the blower 500 may include a plurality of fans 500, and each fan 500 may be configured to dissipate heat from different light emitting areas, where each light emitting area is correspondingly provided with a light sensor 300. The controller is electrically connected to the light sensors 300, and is configured to control, for each light emitting region, the brightness of the light emitting unit 220 in the light emitting region and the rotation speed of the blower 500 corresponding to the light emitting region according to the brightness detected by the light sensor 300 corresponding to the light emitting region.
For example, the area of the backlight module 200 where the light emitting unit 220 is located may be divided into a plurality of light emitting areas, and each light emitting area is provided with the light sensor 300 for detecting the brightness of the light emitting area. The controller may be electrically connected to each of the light sensors 300, and may acquire the brightness detected by each of the light sensors 300, and compare the brightness of the light emitting area detected by the light sensor 300 with the target brightness. In case that the brightness of any one of the light emitting areas detected by the light sensor 300 is lower than the target brightness, the rotation speed of the blower 500 corresponding to the light emitting area is increased so that the thermoelectric conversion module 400 generates more electric quantity, and the controller compensates the electric quantity to the light emitting unit 220 to increase the current of the light emitting unit 220, thereby realizing brightness compensation. In addition, the heat dissipation rate of the backlight module 200 can be increased, and the operating temperature of the light emitting unit 220 can be reduced.
Further, referring to fig. 2 and 3, in order to increase the heat dissipation efficiency of the fan 500 on the cold side insulating layer 420 and increase the temperature difference between the cold side and the hot side, the backlight module 200 may further include a heat sink 600, and the cold side insulating layer 420 is fixed on the heat sink bottom plate 610.
A plurality of heat sinks 620 are formed on a side of the heat sink base 610 away from the cold end insulating layer 420, and each heat sink 620 is provided with a through hole (not shown) for fixing a heat pipe 630, and the heat pipe 630 is connected to each heat sink 620 through the through hole. By providing the radiator 600 on the cold side insulating layer 420, the heat radiation area of the cold side insulating layer 420 can be increased, and the heat radiation speed can be increased when the fan 500 is used to radiate the heat of the radiator 600.
In some embodiments, the cold end insulating layer 420 may also be used as the radiator bottom 610, so that the structure may be simplified and the heat dissipation efficiency may be improved.
The heat pipe 630 may also be filled with condensate. The condensate can be evaporated after absorbing the heat of the cold end insulating layer 420, cooled and condensed after being radiated by the fan 500, and then returned to the cold end insulating layer 420 to form continuous circulation, so that the radiating efficiency of the cold end insulating layer 420 can be further improved, and the radiating of the backlight module 200 can be accelerated.
Further, the backlight module may further include an energy storage module (not shown). The controller may be electrically connected with the energy storage module. The controller may also store the electric energy converted by the thermoelectric conversion module 400 in the energy storage module in case the brightness detected by the light sensor 300 is not lower than the target brightness. The power in the energy storage module may be output to the controller so that the controller may provide power to the lighting unit or other modules in the display device, such as a fan, as desired. The electric energy stored in the energy storage module may also be output to other circuit modules, for example, an electric energy compensation module of the light emitting unit 220, and the controller controls the electric energy compensation module to provide the stored electric energy to the light emitting unit 220, so as to improve the utilization rate of the electric energy.
It is understood that the devices included in the backlight module of the present application are not limited to the above-mentioned circuit devices, for example, a voltage stabilizing circuit may be further included at the output end of the thermoelectric conversion module 400 to improve the stability of the output power of the thermoelectric conversion module 400, which is not particularly limited in this embodiment.
The embodiment of the application provides a backlight module, which comprises a back plate, a light emitting unit, a light sensor, a thermoelectric conversion module and a controller, wherein the light emitting unit, the light sensor and the thermoelectric conversion module are arranged on the back plate; the light sensor can detect the brightness of the light emitting unit, and the thermoelectric conversion module can convert the heat energy of the backlight module into electric energy. The controller is electrically connected with the light sensor and the thermoelectric conversion module respectively, and can utilize the electric energy converted by the thermoelectric conversion module to carry out brightness compensation on the light emitting unit under the condition that the brightness detected by the light sensor is lower than the target brightness. The technical scheme provided by the application can convert the heat energy of the backlight module into electric energy and output the electric energy to the light-emitting unit, so that the brightness uniformity of the backlight module can be improved, the power consumption can be reduced, the backlight module can be cooled, the temperature of the backlight module can be reduced, and the service life of the light-emitting unit can be prolonged.
Based on the same inventive concept, the present application provides a display device, which may include a liquid crystal display panel and the backlight module described in any of the above embodiments.
Since the display device in this embodiment includes the backlight module in the foregoing embodiment, that is, the display device in this embodiment has all the technical features and technical effects of the foregoing embodiment of the backlight module, reference is specifically made to the foregoing embodiment, and details thereof will not be described herein.
It should be understood that in the description of the application and the claims that follow, the terms "comprising," "including," "having," and any variations thereof are intended to cover a non-exclusive inclusion, which is meant to be "including but not limited to," unless otherwise specifically emphasized.
In the description of the present application, unless otherwise indicated, "/" means that the objects associated in tandem are in a "or" relationship, e.g., A/B may represent A or B; in the present application, "and/or" describing the association relationship of the association object, it means that there may be three relationships, for example, a and/or B may mean: a alone, a and B together, and B alone, wherein A, B may be singular or plural.
Also, in the description of the present application, unless otherwise indicated, "a plurality" means two or more than two. "at least one of the following" or similar expressions thereof, means any combination of these items, including any combination of single or plural items.
In addition, in the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the present application, unless specifically stated and limited otherwise, the terms "connected," "coupled," and the like are to be construed broadly and may be, for example, mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, unless otherwise specifically defined, the meaning of the terms in this disclosure is to be understood by those of ordinary skill in the art.
Furthermore, in the description of the present specification and the appended claims, the terms "first," "second," and the like are used to distinguish between similar objects, and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. It is to be understood that the data so used may be interchanged where appropriate, such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein; features defining "first", "second" may include at least one such feature, either explicitly or implicitly.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A backlight module, comprising: the device comprises a back plate, a light emitting unit, a light sensor, a thermoelectric conversion module and a controller; the light emitting unit, the light sensor and the thermoelectric conversion module are arranged on the back plate;
the light sensor is used for detecting the brightness of the light-emitting unit;
the thermoelectric conversion module is used for converting heat energy of the backlight module into electric energy;
the controller is electrically connected with the light sensor and the thermoelectric conversion module respectively, and is used for performing brightness compensation on the light emitting unit by utilizing the electric energy converted by the thermoelectric conversion module under the condition that the brightness detected by the light sensor is lower than the target brightness.
2. The backlight module according to claim 1, wherein the thermoelectric conversion module is disposed on an outer wall of the back plate;
the thermoelectric conversion module comprises a hot end insulating layer arranged on the outer wall of the backboard, a cold end insulating layer arranged opposite to the hot end insulating layer, and a thermoelectric power generation assembly clamped between the hot end insulating layer and the cold end insulating layer.
3. The backlight module according to claim 2, wherein the thermoelectric generation assembly comprises a plurality of semiconductor assemblies arranged in an array, each semiconductor assembly comprises a P-type semiconductor and an N-type semiconductor, and the P-type semiconductor and the N-type semiconductor in the same semiconductor assembly are connected in series through a first metal sheet arranged on the hot end insulating layer; each semiconductor assembly is connected in series by a second metal sheet spaced above the cold end insulating layer.
4. A backlight module according to claim 3, wherein each of the first metal sheets is formed by a copper layer plated on the hot-end insulating layer, and each of the second metal sheets is formed by a copper layer plated on the cold-end insulating layer.
5. The backlight module according to claim 2, further comprising a fan for dissipating heat from the cold end insulating layer;
the controller is electrically connected with the fan, and the controller is further used for: controlling the fan to rotate at a first rotation speed under the condition that the brightness detected by the light sensor is lower than the target brightness; and controlling the fan to rotate at a second rotation speed under the condition that the brightness of the light sensor is not lower than the target brightness, wherein the first rotation speed is higher than the second rotation speed.
6. The backlight module according to claim 5, wherein the controller is further configured to output the electric energy converted by the thermoelectric conversion module to the blower fan in a case where the luminance of the light sensor is not lower than the target luminance.
7. The backlight module according to claim 5, wherein the fans comprise a plurality of fans, each fan being configured to dissipate heat from a different light emitting area; each light emitting area is correspondingly provided with the light sensor;
the controller is electrically connected with the light sensors respectively and is used for controlling the brightness of the light emitting units in the light emitting areas and the rotating speed of the fans corresponding to the light emitting areas according to the brightness detected by the light sensors corresponding to the light emitting areas for each light emitting area.
8. The backlight module according to claim 2, further comprising a heat sink, wherein the cold end insulating layer is fixed on a bottom plate of the heat sink;
and one side of the bottom plate of the radiator, which is far away from the cold end insulating layer, is provided with a plurality of radiating fins arranged at intervals, each radiating fin is provided with a through hole for fixing a heat pipe, and the heat pipe is connected with each radiating fin through the through hole.
9. A backlight module according to any of claims 1-8, further comprising an energy storage module;
the controller is electrically connected with the energy storage module, and is further configured to store the electric energy converted by the thermoelectric conversion module in the energy storage module when the brightness detected by the light sensor is not lower than the target brightness.
10. A display device, comprising: a liquid crystal display panel and a backlight module according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311255701.5A CN117075390A (en) | 2023-09-27 | 2023-09-27 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311255701.5A CN117075390A (en) | 2023-09-27 | 2023-09-27 | Backlight module and display device |
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| CN117075390A true CN117075390A (en) | 2023-11-17 |
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| CN101042481A (en) * | 2006-03-21 | 2007-09-26 | 株式会社半导体能源研究所 | Backlight device and display device |
| US20090128729A1 (en) * | 2007-11-16 | 2009-05-21 | Dunn William R | Air curtain for display |
| CN103852944A (en) * | 2012-11-30 | 2014-06-11 | 乐金显示有限公司 | Liquid crystal display and method for manufacturing the same |
| CN112270898A (en) * | 2020-11-03 | 2021-01-26 | 广东韩科实业有限公司 | Heat dissipation device for liquid crystal display |
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| JP2004296989A (en) * | 2003-03-28 | 2004-10-21 | Tanaka Kikinzoku Kogyo Kk | Substrate for light emitting diode device |
| JP2007127706A (en) * | 2005-11-01 | 2007-05-24 | Ricoh Co Ltd | Liquid crystal display device, image forming apparatus and manufacturing method |
| CN101042481A (en) * | 2006-03-21 | 2007-09-26 | 株式会社半导体能源研究所 | Backlight device and display device |
| US20090128729A1 (en) * | 2007-11-16 | 2009-05-21 | Dunn William R | Air curtain for display |
| CN103852944A (en) * | 2012-11-30 | 2014-06-11 | 乐金显示有限公司 | Liquid crystal display and method for manufacturing the same |
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