CN114355649B - Color temperature compensation device, backlight module and display device - Google Patents
Color temperature compensation device, backlight module and display device Download PDFInfo
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- CN114355649B CN114355649B CN202111619078.8A CN202111619078A CN114355649B CN 114355649 B CN114355649 B CN 114355649B CN 202111619078 A CN202111619078 A CN 202111619078A CN 114355649 B CN114355649 B CN 114355649B
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Abstract
The application discloses a color temperature compensation device, a backlight module and a display device. The color temperature compensation device includes: a sensor; the controller is connected with the sensor; the color temperature compensation film comprises a first electrode layer, a second electrode layer and an electrochromic layer positioned between the first electrode layer and the second electrode layer, wherein the first electrode layer and the second electrode layer are connected with a controller. After the temperature detected by the sensor reaches or exceeds a threshold value, a temperature signal is sent to the controller, and the controller controls the voltage between the first electrode layer and the second electrode layer according to the temperature signal so that the electrochromic layer is changed from colorless to transparent to a preset color. The color temperature compensation device monitors temperature through the sensor, and when the temperature is too high, the color temperature compensation film color is changed by applying voltage to the color temperature compensation film through the controller, and light passing through the color temperature compensation film is subjected to light compensation.
Description
Technical Field
The present disclosure relates to display manufacturing technology, and more particularly to a color temperature compensation device, a backlight module, and a display.
Background
LCDs (liquid crystal display devices) are increasingly being used because of their low emissivity, thinness, shortness, and low power consumption.
However, in FFS (new fringe field switching technology) mode, when the panel temperature is too high, the LCD may have color shift problem, because the liquid crystal optical rotation of the liquid crystal is insufficient at high temperature, so that the transmittance of part of green light and part of yellow light may be greatly reduced, for example, at 85 ℃, the transmittance of part of green light and part of yellow light may be reduced due to the low optical rotation of the liquid crystal compared with the transmittance of 25 ℃ at normal temperature, the panel may display color shift blue, and the brightness may be reduced by about 30%.
Disclosure of Invention
The technical problem that this application mainly solves is to provide a colour temperature compensation arrangement, backlight unit and display device, detects the temperature through the sensor in the colour temperature compensation arrangement, adjusts the colour of colour temperature compensation membrane when the temperature is too high, can carry out the optical compensation to the light when the light passes through. The problem that the display part of the panel of the liquid crystal display device is lack of blue light at high temperature can be effectively solved.
For solving the technical problem, a first technical scheme that this application adopted is to provide a colour temperature compensation arrangement, and colour temperature compensation arrangement includes: a sensor; the controller is connected with the sensor; the color temperature compensation film comprises a first electrode layer, a second electrode layer and an electrochromic layer positioned between the first electrode layer and the second electrode layer, and the first electrode layer and the second electrode layer are connected with the controller; after the temperature detected by the sensor reaches or exceeds a threshold value, a temperature signal is sent to the controller, and the controller controls the voltage between the first electrode layer and the second electrode layer according to the temperature signal so that the electrochromic layer is changed from colorless to transparent to a preset color.
For solving above-mentioned technical problem, the second technical scheme that this application adopted provides a backlight unit, corresponds the setting with the panel, and backlight unit includes: an optical film; the backlight source is arranged corresponding to the optical film, and at least part of light led out by the backlight source is emitted to the optical film; the color temperature compensation device is arranged corresponding to the backlight source, at least part of light led out by the backlight source passes through the color temperature compensation device and is emitted out of the backlight module to the panel, and the color temperature compensation device comprises: the sensor is arranged against the panel; the controller is connected with the sensor; the color temperature compensation film comprises a first electrode layer, a second electrode layer and an electrochromic layer positioned between the first electrode layer and the second electrode layer, and the first electrode layer and the second electrode layer are connected with the controller; after the temperature detected by the sensor reaches or exceeds a threshold value, a temperature signal is sent to the controller, and the controller controls the voltage between the first electrode layer and the second electrode layer according to the temperature signal so that the electrochromic layer is changed from colorless to transparent to a preset color.
Wherein the first electrode layer and the second electrode layer are colorless and transparent; the preset color is yellow, the depth of the preset color can be changed along with the temperature signal received by the controller, the voltage between the first electrode layer and the second electrode layer is controlled to be larger as the temperature of the temperature signal is higher, the preset color is darker, the voltage is smaller as the temperature of the temperature signal is lower, and the preset color is lighter.
The backlight source is a side-in type backlight source or a direct-in type backlight source, the side-in type backlight source comprises light emitting diodes and light guide plates which are arranged corresponding to the light emitting diodes, and the direct-in type backlight source comprises a plurality of light emitting diodes which are arranged in an array.
The color temperature compensation film is attached to the optical film or the backlight source, or the color temperature compensation film is arranged corresponding to the optical film at intervals.
Wherein, optical film includes: a diffusion sheet; a reflection sheet; the diffusion sheet and the reflection sheet are respectively positioned at two opposite sides of the backlight source.
Wherein, the colour temperature compensation film sets up with the diffusion piece laminating, or colour temperature compensation film sets up with the backlight laminating, or colour temperature compensation film sets up with the reflector plate laminating and is located the one side of reflector plate towards the backlight.
The color temperature compensation film is arranged between the diffusion sheet and the backlight source, or the color temperature compensation film is arranged between the backlight source and the reflecting sheet.
The color temperature compensation film and the diffusion sheet are opposite to and spaced from the surface of the backlight source.
In order to solve the technical problem, a third technical scheme adopted by the application is to provide a display device, the display device comprises a panel, a back plate and a backlight module, the backlight module is arranged between the panel and the back plate, the backlight module is the backlight module described above, the sensor and the controller are located in a non-display area of the display device, the color temperature compensation film is located in a display area of the display device, and the sensor is arranged close to the panel.
The beneficial effects of this application are: in order to solve the above problems, the present application provides a color temperature compensation device, a backlight module and a display device, wherein the color temperature compensation device comprises a sensor, a controller and a color temperature compensation film, the sensor is attached to a panel, the sensor detects the temperature of the panel, when the temperature of the panel is too high, the controller controls the color temperature compensation film to change the color, changes the light transmittance, and avoids the color shift and the brightness reduction of the display device at high temperature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic structural diagram of an embodiment of a color temperature compensation device of the present application;
fig. 2 is a schematic structural diagram of a first embodiment of a backlight module according to the present application;
fig. 3 is a schematic structural diagram of a second embodiment of a backlight module according to the present application;
fig. 4 is a schematic structural diagram of a third embodiment of a backlight module according to the present application;
fig. 5 is a schematic structural diagram of a fourth embodiment of a backlight module according to the present application;
fig. 6 is a schematic structural diagram of a fifth embodiment of a backlight module according to the present application;
fig. 7 is a schematic structural diagram of a sixth embodiment of a backlight module according to the present application;
fig. 8 is a schematic structural diagram of a seventh embodiment of a backlight module of the present application;
fig. 9 is a schematic structural diagram of an eighth embodiment of a backlight module of the present application;
fig. 10 is a schematic structural diagram of a ninth embodiment of a backlight module of the present application;
fig. 11 is a schematic structural view of an embodiment of a display device of the present application.
Reference numerals:
100. color temperature compensating means; 318/418, light emitting diodes; 328. a light guide plate; 428. a flexible circuit board; 1110. a display device; 1112. a panel; 1111. a back plate;
200/300/400/500/600/700/800/900/1000/1100, a backlight module;
104/204/504/604/704/804/904/1004/1104, sensors;
105/205/505/605/705/805/905/10051105, a controller;
106/206/506/606/706/806/906/1006/1106, color temperature compensation film;
101/201/501/601/701/801/901/1001, a first electrode layer;
103/203/503/603/703/803/903/1003, a second electrode layer;
102/202/502/602/702/802/902/1002 and electrochromic layers;
207/507/607/707/807/907/1007, diffusion sheet;
208/308/408/508/608/708/808/908/1008, backlight source;
209/509/609/709/809/909/1009, a reflective sheet.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two, but does not exclude the case of at least one.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
Under the high-temperature environment, the liquid crystal has insufficient optical rotation, the transmittance of part of green light and part of yellow light can be greatly reduced, the display color of the panel is bluish, and meanwhile, the brightness is reduced. When the temperature of the panel is too high, the color of the color temperature compensation device is adjusted to change the light transmittance of the panel, so that the problems that the color of the panel is blue and the brightness of the liquid crystal display device is reduced at high temperature can be effectively solved.
The following describes a color temperature compensation device, a backlight module and a display device provided by the application in detail with reference to embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a color temperature compensation device 100 of the present application.
As shown in fig. 1, in the present embodiment, a color temperature compensation device 100 includes a sensor 104, a controller 105, and a color temperature compensation film 106.
Wherein the controller 105 is connected with the sensor 104. The color temperature compensation film 106 includes a first electrode layer 101, a second electrode layer 103, and an electrochromic layer 102 between the first electrode layer 101 and the second electrode layer 103, the first electrode layer 101 and the second electrode layer 103 being connected to a controller 105. After the sensor 104 detects that the temperature reaches or exceeds the threshold value, a temperature signal is sent to the controller 105, and the controller 105 controls the voltage between the first electrode layer 101 and the second electrode layer 103 according to the temperature signal, so that the electrochromic layer 102 changes from colorless to transparent to a preset color.
In this embodiment, the first electrode layer 101 and the second electrode layer 103 are colorless and transparent, the electrochromic layer 102 is colorless in an initial state, the electrochromic layer 102 specifically includes an ion storage layer, an electrolyte layer and an electroluminescent layer, when no voltage is applied between the first electrode layer 101 and the second electrode layer 103, the color temperature compensation film 106 is colorless, the colorless and transparent color temperature compensation film 106 has no influence on light passing through, when a voltage is applied to the first electrode layer 101 and the second electrode layer 103, ions in the ion storage layer enter the electroluminescent layer through the electrolyte layer under the action of an applied electric field, meanwhile electrons in one layer of the first electrode layer 101 and the second electrode layer 103 which is an anode enter the electrochromic layer 102, the ions and the electrons cause the electrochromic layer 102 to change from colorless and transparent to yellowish after oxidation-reduction reaction, specifically, the more the voltage at two ends of the electrochromic layer 102 is larger, the more the yellow degree of the electrochromic layer 102 is smaller, and the more the yellow degree of the electrochromic layer 102 is smaller. The color temperature compensation film 106 after color change has a complementary effect on the light passing through, wherein the reaction is a reversible reaction, and the electrochromic layer 102 returns to a colorless transparent state after the external electric field is canceled.
It can be appreciated that the first electrode layer 101, the second electrode layer 103 and the electrochromic layer 102 in the color temperature compensation device 100 can be changed in color by applying a voltage so as to realize light supplement to the passing light, and the color temperature compensation device 100 of the present application further includes a sensor 104 and a controller 105. The sensor 104 is in a specific application and is attached to the panel, and the temperature detected by the sensor 104 is the temperature of the panel. When the panel temperature is in the normal temperature state, the optical rotation of the liquid crystal of the panel is normal, and at this time, the controller 105 does not apply a voltage to the first electrode layer 101 and the second electrode layer 103, and the electrochromic layer 102 is colorless and transparent in the initial state, and does not affect the light transmission. When the temperature of the panel detected by the sensor 104 is too high, the controller 105 applies voltage to the first electrode layer 101 and the second electrode layer 103, the electrochromic layer 102 changes color to be yellow under the action of an applied electric field, and yellow light is supplemented to the transmitted light.
Correspondingly, the application provides a backlight module.
Specifically, referring to fig. 2, fig. 2 is a schematic structural diagram of a first embodiment of a backlight module 200 according to the present application. As shown in fig. 2, in the present embodiment, the backlight module 200 includes an optical film (not shown), a backlight 208, and a color temperature compensation device (not shown).
Wherein the backlight 208 is disposed corresponding to the optical film, and at least a portion of the light directed from the backlight 208 impinges on the optical film. The color temperature compensation device is disposed corresponding to the backlight 208, at least part of light led out from the backlight 208 passes through the color temperature compensation device and is emitted out of the backlight module 200 onto the panel, and the color temperature compensation device includes: a sensor 204 disposed against the panel; a controller 205 connected to the sensor 204. The color temperature compensation film 206 includes a first electrode layer 201, a second electrode layer 203, and an electrochromic layer 202 between the first electrode layer 201 and the second electrode layer 203, the first electrode layer 201 and the second electrode layer 203 being colorless and transparent, the first electrode layer 201 and the second electrode layer 203 being connected to a controller 205. After the sensor 204 detects that the temperature reaches or exceeds the threshold value, a temperature signal is sent to the controller 205, and the controller 205 controls the voltage between the first electrode layer 201 and the second electrode layer 203 according to the temperature signal, so that the electrochromic layer 202 changes from colorless to transparent to a preset color.
The preset color is yellow, and the shade of the preset color is changed according to the temperature signal received by the controller 205, so that the voltage between the first electrode layer 201 and the second electrode layer 203 is controlled to be higher as the temperature of the temperature signal is higher, the voltage is higher as the temperature of the temperature signal is lower, the voltage is lower as the temperature of the temperature signal is lower, and the preset color is lighter. Specifically, when the panel of the display device works in an environment with a high temperature, insufficient optical rotation of the liquid crystal in the panel can cause the transmittance of green light and yellow light to be greatly reduced, and when the yellow light is excessively absent, the light source can display blue on the panel, and the higher the ambient temperature is, the lower the transmittance of the yellow light is. By setting the electrochromic layer 202 to change from colorless and transparent to yellow after applying voltage, the light emitted by the backlight source 208 can supplement yellow light when passing through the electrochromic layer 202, the light can not appear blue-bias phenomenon when passing through the supplement yellow light, and the higher the temperature is, the controller 205 controls the higher the voltage between the first electrode layer 201 and the second electrode layer 203, the darker the yellow of the electrochromic layer 202 is, the more sufficient the yellow light passing through the light is, and by setting the color temperature compensation device 206, the backlight module 200 can adaptively adjust the self-adaptive light compensation for the deficiency of the yellow light according to the environmental temperature.
The color temperature compensation film 206 is attached to the optical film or the backlight 208, or the color temperature compensation film 206 is disposed at a distance from the optical film. Specifically, the optical films in the backlight module 200 include various films, and the color temperature compensation film 206 may be attached to any one of the films or may be disposed at intervals corresponding to any one of the films. Various methods of arrangement enable the color temperature compensation film 206 to perform its function of light compensation for the light emitted by the backlight 208.
The optical film includes a diffusion sheet 207 and a reflection sheet 209, and the diffusion sheet 207 and the reflection sheet 209 are respectively located at two opposite sides of the backlight 208.
In the present embodiment, the optical film includes a diffusion sheet 207 and a reflection sheet 209, and in other embodiments, the optical film can include, for example, a brightness enhancement film, an infrared reflection film, and the like.
In the present embodiment, the backlight 208 is an LED, which has the characteristics of good color reproducibility, low power consumption, and long lifetime, and in other embodiments, the backlight 208 may be another light emitting device such as CCFL, which is not particularly limited in this application.
In the present embodiment, the diffusion sheet 207 is provided to make the light emitted from the backlight unit 200 to the panel uniform. Specifically, a plurality of chemical micro-particles with different sizes are formed in the diffusion sheet 207, when light passes through the diffusion sheet 207, the light continuously passes through two media with different refractive indexes, and a plurality of refraction, reflection and scattering effects are generated on the light, so that a light diffusion effect is caused, and a uniform surface light source is formed.
Specifically, the reflective sheet 209 can reflect light emitted from the backlight 208 in a direction opposite to that of the diffusion sheet 207, and the light utilization efficiency is increased by providing the reflective sheet 209 structure.
The backlight sources in the backlight module can be a direct-in backlight source and a side-in backlight source. Specifically, please refer to fig. 3 and fig. 4. Fig. 3 is a schematic structural diagram of a second embodiment of the backlight module of the present application, and fig. 4 is a schematic structural diagram of a third embodiment of the backlight module of the present application.
Referring to fig. 3, in fig. 3, the backlight 308 is a side-in backlight, and the backlight 308 includes a light emitting diode 318 and a light guide plate 328 corresponding to the light emitting diode. Specifically, the light emitted by the led 318 is emitted to each light guide point on one end surface of the light guide plate 328, and the light is diffused in each angle in the light guide plate 328, so that the light reflection condition is destroyed, and the light is emitted from the front surface of the light guide plate 328, and the front surface of the light guide plate 328 has various light guide points with different densities and sizes, so that the light guide plate 328 emits light uniformly.
Referring to fig. 4, in fig. 4, the backlight 408 is a direct-in backlight, and the backlight 408 includes a plurality of light emitting diodes 418 arranged in an array. Wherein a plurality of leds 418 are fixedly disposed on a flexible circuit board 428. In the embodiment of fig. 4, the direct backlight includes the light emitting diode 418 and the flexible circuit board 428, and in other embodiments, the direct backlight can also include a light guide plate disposed on the light emitting surface of the flexible circuit board.
It can be understood that the backlight module 300 of the side-in backlight 308 in fig. 3 has the light emitting diodes 318 arranged on the side, which has the advantage of thinner device compared with the backlight module 400 of the direct-in backlight 408 in fig. 4, and the light emitting effect of the backlight module 300 of the direct-in backlight 308 is slightly better. Both the backlight 308 of fig. 3 and the backlight 408 of fig. 4 are included within the scope of the present application, and are not specifically limited thereto.
Note that in the embodiments shown below, the backlight is shown as a side-entry backlight.
The color temperature compensation film of the backlight module can be attached to the diffusion sheet, the backlight source and the reflection sheet, and can be specifically shown in fig. 5, 6 and 7. Or may be disposed between any of the diaphragms individually, see fig. 8, 9 and 10.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present application.
In this embodiment, the backlight module 500 includes a backlight 508, a color temperature compensation device (not shown), and an optical film (not shown). The optical film includes a diffusion sheet 507 and a reflection sheet 509.
Wherein the color temperature compensation device comprises a sensor 504, which is arranged against the panel. A controller 505 is connected to the sensor 504. The color temperature compensation film 506 includes a first electrode layer 501, a second electrode layer 503, and an electrochromic layer 502 between the first electrode layer 501 and the second electrode layer 503, the first electrode layer 501 and the second electrode layer 503 being connected to the controller 505.
The backlight 508 is a light emitting diode (not shown) and a light guide plate (not shown) corresponding to the light emitting diode.
Wherein the diffusion sheet 507 and the reflection sheet 509 are respectively located at two opposite sides of the backlight 508.
Wherein, the color temperature compensation film 506 is attached to the diffusion sheet 507.
In the present embodiment, the color temperature compensation film 506 is attached to the diffusion sheet 507, specifically, the color temperature compensation film 506 is attached to a surface of the diffusion sheet 507 away from the backlight 508, and in other embodiments, the color temperature compensation film 506 may be attached to a surface of the diffusion sheet 507 close to the backlight 508.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a backlight module according to a fifth embodiment of the present application.
In this embodiment, the backlight module 600 includes a backlight 608, a color temperature compensation device (not shown) and an optical film (not shown), wherein the optical film includes a diffusion sheet 607 and a reflection sheet 609.
Wherein the color temperature compensation device comprises a sensor 604, which is arranged close to the panel; a controller 605 connected to the sensor 604; the color temperature compensation film 606 includes a first electrode layer 601, a second electrode layer 603, and an electrochromic layer 602 between the first electrode layer 601 and the second electrode layer 603, the first electrode layer 601 and the second electrode layer 603 being connected to the controller 605.
The backlight 608 is a light emitting diode (not shown) and a light guide plate (not shown) corresponding to the light emitting diode.
Wherein the diffusion sheet 607 and the reflection sheet 609 are respectively located at two opposite sides of the backlight 608.
Wherein, the color temperature compensation film 606 is attached to the backlight 608.
In the present embodiment, the color temperature compensation film 606 is attached to the backlight 608, specifically, the color temperature compensation film 606 is attached to the surface of the backlight 608 away from the reflector 609, and in other embodiments, the color temperature compensation film 606 may be attached to the surface of the backlight 608 close to the diffuser 607.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a backlight module according to a sixth embodiment of the present application.
In this embodiment, the backlight module 700 includes a backlight 708, a color temperature compensation device (not shown), a diffusion sheet 707, and a reflection sheet 709.
Wherein the color temperature compensation device comprises a sensor 704 arranged against the panel; a controller 705 coupled to the sensor 704; the color temperature compensation film 706 includes a first electrode layer 701, a second electrode layer 703, and an electrochromic layer 702 between the first electrode layer 701 and the second electrode layer 703, and the first electrode layer 701 and the second electrode layer 703 are connected to a controller 705.
The backlight 708 is a light emitting diode (not shown) and a light guide plate (not shown) corresponding to the light emitting diode.
Wherein the diffusion sheet 707 and the reflection sheet 709 are respectively located at two opposite sides of the backlight 708.
The color temperature compensation film 706 is attached to the reflective sheet 709, and is located on a surface of the reflective sheet 709 facing the backlight 708.
In the present embodiment, the color temperature compensation film 706 is provided in contact with the reflection sheet 709.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a backlight module according to a seventh embodiment of the present application.
In this embodiment, the backlight module 800 includes a backlight 808, a color temperature compensation device (not shown), a diffusion sheet 807, and a reflection sheet 809.
The color temperature compensation device comprises a sensor 804, and is arranged close to the panel; a controller 805 connected to the sensor 804; the color temperature compensation film 806 includes a first electrode layer 801, a second electrode layer 803, and an electrochromic layer 802 between the first electrode layer 801 and the second electrode layer 803, and the first electrode layer 801 and the second electrode layer 803 are connected to a controller 805.
The backlight 808 is a light emitting diode (not shown) and a light guide plate (not shown) corresponding to the light emitting diode.
Wherein the diffuser 807 and the reflector 809 are located on opposite sides of the backlight 808, respectively.
Wherein the color temperature compensation film 806 is disposed between the diffuser 807 and the backlight 808.
In the present embodiment, the color temperature compensation film 806 is located between the diffusion sheet 807 and the backlight 808.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an eighth embodiment of a backlight module according to the present application.
In this embodiment, the backlight module 900 includes a backlight 908, a color temperature compensation device (not shown), a diffusion plate 907 and a reflection plate 909.
Wherein the color temperature compensation device comprises a sensor 904 arranged against the panel; a controller 905 connected to the sensor 904; the color temperature compensation film 906 includes a first electrode layer 901, a second electrode layer 903, and an electrochromic layer 902 between the first electrode layer 901 and the second electrode layer 903, and the first electrode layer 901 and the second electrode layer 903 are connected to a controller 905.
The backlight 908 is a light emitting diode (not shown) and a light guide plate (not shown) corresponding to the light emitting diode.
Wherein the diffusion sheet 907 and the reflection sheet 909 are respectively located at two opposite sides of the backlight 908.
Wherein the color temperature compensation film 906 is disposed between the backlight 908 and the reflection sheet 909.
In the present embodiment, the color temperature compensation film 906 is located between the backlight 908 and the reflective sheet.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a backlight module according to a ninth embodiment of the present application.
In this embodiment, the backlight module 1000 includes a backlight 1008, a color temperature compensation device (not shown), a diffusion plate 1007, and a reflective plate 1009.
Wherein, the color temperature compensation device comprises a sensor 1004 which is arranged close to the panel; a controller 1005 connected to the sensor 1004; the color temperature compensation film 1006 includes a first electrode layer 1001, a second electrode layer 1003, and an electrochromic layer 1002 located between the first electrode layer 1001 and the second electrode layer 1003, and the first electrode layer 1001 and the second electrode layer 1003 are connected to a controller 1005.
The backlight 1008 is a light emitting diode (not labeled) and a light guide plate (not labeled) disposed corresponding to the light emitting diode.
Wherein the diffusion sheet 1007 and the reflection sheet 1009 are respectively located at two opposite sides of the backlight 1008.
Wherein the color temperature compensation film 1006 is disposed opposite to and spaced apart from the surface of the diffusion sheet 1007 away from the backlight 1008.
In the present embodiment, the color temperature compensation film 1006 is located on the surface of the diffusion sheet 1007 away from the backlight 1008 at intervals.
It can be understood that the arrangement structure of any one of the color temperature compensation films shown in fig. 5, 6, 7, 8, 9 and 10 can effectively compensate the light emitted by the backlight source when the voltage is applied to the color temperature compensation film, so that the light displayed on the panel is free from color deviation. It should be noted that the above embodiments only show the arrangement relation between the color temperature compensation film and the backlight and the diffusion sheet and the reflection sheet in the optical film, the optical film is not limited to include the diffusion sheet and the reflection sheet, and the optical film in different backlight modules can include, for example, a brightness enhancement film, an anti-infrared film, a composite brightness enhancement film, etc., and in other embodiments, the color temperature compensation film may be disposed between any films of the optical film, or may be bonded to any films, which is not specifically limited in this application.
Correspondingly, the application provides a display device.
Specifically, referring to fig. 11, fig. 11 is a schematic structural diagram of an embodiment of a display device according to the present application. As shown in fig. 11, in the present embodiment, the display device 1110 includes a panel 1112, a back panel 1111, and a backlight module 1100.
In this embodiment, the backlight module 1100 is the backlight module 1100 described in any of the above embodiments.
The sensor 1104 and the controller 1105 are located in a non-display area (not labeled) of the display device 1110, the color temperature compensation film 1106 is located in a display area (not labeled) of the display device 1110, and the sensor 1104 is disposed against the panel 1112.
The non-display area setting of the sensor 1104 and the controller 1105 in the display device 1110 does not affect the screen display of the display device 1110. The display device 1110 has a backlight module 1100 with a color temperature compensation device (not labeled), wherein a sensor 1104 in the color temperature compensation device is arranged against a panel 1112 to detect the temperature of the panel 1112 in real time, and when the temperature of the panel 1112 is too high, the color of the color temperature compensation film 1106 is adjusted by controlling a module speed 1105 to perform light compensation on the passing light.
By the mode, the color temperature compensation device is added in the backlight module, and comprises a sensor, a controller and a color temperature compensation film. The color temperature compensation film is arranged between any optical films in the backlight assembly, the sensor is attached to the panel, the temperature of the panel is monitored in real time by connecting the sensor with the color temperature compensation film through the controller, and when the temperature of the panel is too high, the color temperature compensation film is changed to adjust the light transmission of the color temperature compensation film, so that the color cast problem caused by the fact that the optical rotation of liquid crystal is insufficient, and the transmittance of green light and yellow light is greatly reduced at high temperature is effectively avoided.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent principle changes made by the specification and the drawings of the present application, or direct or indirect application in other related technical fields, are included in the scope of the patent protection of the present application.
Claims (8)
1. A backlight module, characterized in that it is disposed corresponding to a panel, the backlight module comprising:
an optical film;
the backlight source is arranged corresponding to the optical film, and at least part of light led out by the backlight source is emitted to the optical film;
the color temperature compensation device is arranged corresponding to the backlight source, at least part of light led out by the backlight source passes through the color temperature compensation device and is emitted out of the backlight module to the panel, and the color temperature compensation device comprises:
a sensor disposed against the panel; the panel is a liquid crystal display panel, and the sensor is used for detecting the temperature of the panel;
the controller is connected with the sensor;
the color temperature compensation film comprises a first electrode layer, a second electrode layer and an electrochromic layer positioned between the first electrode layer and the second electrode layer, and the first electrode layer and the second electrode layer are connected with the controller; the first electrode layer and the second electrode layer are colorless and transparent;
the sensor detects that the temperature of the panel reaches or exceeds a threshold value, and then sends a temperature signal to the controller, and the controller controls the voltage between the first electrode layer and the second electrode layer according to the temperature signal so as to change the electrochromic layer from colorless and transparent to preset color;
the preset color is yellow, the shade of the preset color can be changed along with the temperature signal received by the controller, the voltage between the first electrode layer and the second electrode layer is controlled to be changed, the voltage is larger when the temperature of the temperature signal is higher, the preset color is darker, the voltage is smaller when the temperature of the temperature signal is lower, and the preset color is lighter.
2. A backlight module according to claim 1, wherein,
the backlight source is a side-in type backlight source or a direct-in type backlight source, the side-in type backlight source comprises light emitting diodes and light guide plates which are arranged corresponding to the light emitting diodes, and the direct-in type backlight source comprises a plurality of light emitting diodes which are arranged in an array.
3. A backlight module according to claim 1, wherein,
the color temperature compensation film is attached to the optical film or the backlight source, or the color temperature compensation film is arranged at intervals corresponding to the optical film.
4. A backlight module according to claim 3, wherein the optical film comprises:
a diffusion sheet;
a reflection sheet;
the diffusion sheet and the reflection sheet are respectively positioned at two opposite sides of the backlight source.
5. A backlight module according to claim 4, wherein,
the color temperature compensation film is attached to the diffusion sheet, or the color temperature compensation film is attached to the backlight, or the color temperature compensation film is attached to the reflection sheet and located on one surface of the reflection sheet facing the backlight.
6. A backlight module according to claim 4, wherein,
the color temperature compensation film is arranged between the diffusion sheet and the backlight source, or the color temperature compensation film is arranged between the backlight source and the reflecting sheet.
7. A backlight module according to claim 4, wherein,
the color temperature compensation film and the diffusion sheet are opposite to and spaced from the surface of the backlight source.
8. The display device is characterized by comprising a panel, a back plate and a backlight module, wherein the backlight module is arranged between the panel and the back plate, the backlight module is the backlight module according to any one of claims 1-7, the sensor and the controller are positioned in a non-display area of the display device, the color temperature compensation film is positioned in a display area of the display device, and the sensor is arranged close to the panel.
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