Backlight module and display device

Abstract

The embodiment of the present application provides a backlight module and a display device, and relates to the technical field of display devices.The backlight module comprises a plurality of light emitting units and a driving device, at least two of the plurality of light emitting units are configured to emit light with different color temperatures under the same driving voltage; and the driving device is connected with the plurality of light emitting units and is used for selectively driving at least part of the plurality of light emitting units to emit light. In the scheme of the embodiment, the light emitting units of the backlight module can emit light with at least two color temperatures under the same driving voltage, compared with the backlight module using a single rated color temperature lamp bead at present, the color temperature adjustment range of the backlight module provided in the present application is wider, and when the backlight module is applied to a display device, the display device can be matched with a corresponding control device, so that the light spectrum of the display device is closer to the natural spectrum.

Description

Technical Field

[0001] This application relates to the technical field of display devices, specifically to a backlight module and a display device. Background Technology

[0002] Prolonged exposure to display devices can easily cause eye strain, one of the core causes being the spectral difference between artificial and natural light sources. Therefore, the luminous effect of natural light spectrum has always been a pursuit of technicians in the field of display devices. Currently, the backlight modules of display devices can generally only emit one color temperature under rated voltage. This results in a narrow range of adjustable color temperatures for display devices, and the resulting spectrum is generally discontinuous. Long-term use of electronic display products can lead to visual fatigue. Utility Model Content

[0003] This application provides a backlight module and display device, which aims to make the emission spectrum of existing display devices closer to the natural spectrum.

[0004] On one hand, embodiments of this application provide a backlight module, including: A plurality of light-emitting units, wherein at least two of the plurality of light-emitting units are configured to emit light at the same driving voltage but with different color temperatures; and... A driving device that drives and connects to a plurality of light-emitting units, for selectively driving at least a portion of the plurality of light-emitting units to emit light.

[0005] In some embodiments, the plurality of light-emitting units constitute a plurality of light-emitting unit groups, and the rated emission color temperature of the light-emitting units in each light-emitting unit group is set to the same value; The driving device includes a driving module that drives each of the light-emitting unit groups individually.

[0006] In some embodiments, the light-emitting units of the plurality of light-emitting unit groups are arranged alternately.

[0007] In some embodiments, the rated emission color temperatures of the plurality of light-emitting unit groups are set differently; The backlight module is a side-lit backlight module, and the number of light-emitting unit groups in the side-lit backlight module is 2 to 20.

[0008] In some embodiments, the side-lit backlight module has 6 groups of light-emitting units, and its rated emission color temperature is 2700~6500k.

[0009] In some embodiments, the rated emission color temperatures of the six groups of light-emitting units are 2700K, 3000K, 4000K, 5000K, 5700K, and 6500K, respectively.

[0010] In some embodiments, the backlight module includes a backplate defining a plurality of light-emitting areas, a plurality of light-emitting units being disposed in the plurality of light-emitting areas, and the light-emitting units located in the same light-emitting area having the same rated color temperature, and the plurality of light-emitting areas having a plurality of rated color temperatures.

[0011] In some embodiments, the driving device is configured to output a variety of driving voltages.

[0012] On the other hand, embodiments of this application provide a display device, which includes a backlight module as described above.

[0013] In some embodiments, the display device includes a mobile communication device.

[0014] In the solution of this embodiment, since the light-emitting unit of the backlight module can emit at least two light emission color temperatures under the same driving voltage, compared with the backlight module that currently uses lamps with a single rated color temperature, the color temperature adjustment range of the backlight module provided in this application is wider. When applied to a display device, in conjunction with the corresponding control device, the light emission spectrum of the display device can be made closer to the natural spectrum. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a backlight module provided in some embodiments of this application; Figure 2 This is an embodiment of the present application. Figure 1 A partial structural diagram at point A in the middle; Figure 3 This is another embodiment of the present application. Figure 1 A partial structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the structure of a backlight module provided in some embodiments of this application.

[0017] Explanation of key component symbols: Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0021] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0022] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0023] Prolonged exposure to display devices can easily cause eye strain, one of the core causes being the spectral difference between artificial and natural light sources. Therefore, the luminous effect of natural light spectrum has always been a pursuit of technicians in the field of display devices. Currently, the backlight modules of display devices can generally only emit one color temperature under rated voltage. This results in a narrow range of adjustable color temperatures for display devices, and the resulting spectrum is generally discontinuous. Long-term use of electronic display products can lead to visual fatigue.

[0024] For this, please refer to Figures 1 to 4 This application provides a backlight module 100, which includes a plurality of light-emitting units 10 and a driving device. At least two of the plurality of light-emitting units 10 are configured to emit different color temperatures under the same driving voltage. The driving device drives and connects to the plurality of light-emitting units 10 to selectively drive at least a portion of the plurality of light-emitting units 10 to emit light.

[0025] It should be noted that the specific implementation of the light-emitting unit 10 is not limited. It can be a single LED bead, or it can be in the form of a light strip with a plurality of LED beads, etc., and is not limited here. In some embodiments, the light-emitting unit 10 refers to a single LED bead.

[0026] The specific implementation of the driving device is not limited. It can be in the form of a driving chip, a driving board, or a driving IC. It can drive each light-emitting unit 10 individually, or drive each group of light-emitting units with the same rated light emission color temperature individually, or drive multiple light-emitting units 10 with different color temperatures at the same time, etc. There are no limitations here.

[0027] At least two of the plurality of light-emitting units 10 are configured to have different color temperatures under the same driving voltage. That is, under the same driving voltage, the plurality of light-emitting units 10 have at least two color temperatures. The specific number of color temperatures is not limited and can be two, three, four, etc., and is not limited here.

[0028] The driving device is used to selectively drive at least some of the plurality of light-emitting units 10 to emit light. It can be used to select any part and any number of the plurality of light-emitting units 10 to light up, or it can be used to light up only the light-emitting units 10 with the same emission color temperature, or it can be used to light up only a portion of the light-emitting units 10 with the same emission color temperature, or it can be used to select a corresponding number of light-emitting units 10 with different emission color temperatures to light up, etc., and is not limited here.

[0029] The specific implementation of the configuration of the light-emitting unit 10 to emit different color temperatures under the same driving voltage is not limited. It can be that the proportion of phosphor in the light-emitting unit 10 is adjusted to be different, so that the color temperature of the emitted light is different. It can also be that the light-emitting chip of the light-emitting unit 10 is set to be different, so that the color temperature of the emitted light is different, etc., which are not limited here.

[0030] In the scheme of this embodiment, since the light-emitting unit 10 of the backlight module 100 can emit at least two light emission color temperatures under the same driving voltage, compared with the backlight module 100 that currently uses lamp beads with a single rated color temperature, the backlight module 100 provided in this application has a wider color temperature adjustment range. When applied to a display device, in conjunction with the corresponding control device, it can make the light emission spectrum of the display device closer to the natural spectrum.

[0031] According to the above implementation method, the backlight module 100 is paired with a natural spectrum RGBW panel, so that the spectrum emitted by the screen through this device combination is continuous and adjustable. In the voltage control unit, combined with the characteristics of biological rhythms, multiple matching time nodes are set (such as: 6 o'clock / 9 o'clock / 12 o'clock / 14 o'clock / 16 o'clock / 18 o'clock, 6 groups or more matching spectral groups of set time nodes); ultimately, by sensing the color temperature sensor, the ambient color temperature is identified; at different time periods, the light spectrum emitted by the screen is continuous and the color temperature is close to that of the environment, making the human eye more comfortable than ordinary display screens; improving human eye visual fatigue, enhancing visual quality, and achieving the effect of eye protection.

[0032] In some embodiments, the plurality of light-emitting units 10 constitute a plurality of light-emitting unit groups, and the rated emission color temperature of the light-emitting units 10 in each light-emitting unit group is set to the same value; the driving device includes a driving module that drives each light-emitting unit group individually.

[0033] It should be noted that the number of light-emitting units 10 in each of the light-emitting unit groups is not limited and can be one, two, three, etc., which is not limited here. The number of light-emitting units 10 in multiple light-emitting unit groups can be the same or different. For example, the first light-emitting unit group has three light-emitting units 10, the second light-emitting unit group has two light-emitting units 10, the third light-emitting unit group has one light-emitting unit 10, etc., which is not limited here.

[0034] Among the multiple light-emitting unit groups, the rated emission color temperature of any two light-emitting unit groups can be set to the same or different, and this is not limited here.

[0035] In the solution of this embodiment, by setting the light-emitting units 10 with the same rated emission color temperature as a light-emitting unit group, the number of driving modules can be reduced and the cost can be lowered.

[0036] In actual use, when the backlight module 100 needs to emit light of a single color temperature, it can control one or more driving modules corresponding to that color temperature to drive the backlight module 100 to emit light of the corresponding color temperature. The whole control logic is relatively simple.

[0037] The driving module that drives each of the light-emitting unit groups individually can be one driving module driving one light-emitting unit group, or multiple driving modules driving the same light-emitting unit group, etc., and is not limited here.

[0038] It should be noted that the arrangement of the light-emitting units 10 in the multiple light-emitting unit groups can be arbitrary according to actual needs. They can be regularly distributed or irregularly distributed, etc., and are not limited here.

[0039] In some embodiments, the light-emitting units 10 of the plurality of light-emitting unit groups are arranged alternately.

[0040] Specifically, the alternating distribution can be along a certain direction, such as alternating distribution laterally, or alternating distribution along a vertical direction. Taking the backlight module 100 as a side-lit backlight module as an example, it can be that the light-emitting units 10 of multiple light-emitting unit groups are arranged alternately along the length of the lamp strip. For details, please refer to [link to relevant documentation]. Figure 2Taking the light-emitting unit group as three groups, with the light-emitting units 10 of the three groups being the first light-emitting unit 11, the second light-emitting unit 12, and the third light-emitting unit 13 respectively, their order along the length of the light strip can be the first light-emitting unit 11, the second light-emitting unit 12, the third light-emitting unit 13, the first light-emitting unit 11, the second light-emitting unit 12, the third light-emitting unit 13, and so on. Of course, in some embodiments, the light-emitting units 10 of the multiple light-emitting unit groups are alternately distributed in both the longitudinal and transverse directions, etc., which are not limited here.

[0041] In the scheme of this embodiment, by having the light-emitting units 10 of the multiple light-emitting unit groups arranged alternately, when only one light-emitting unit group is lit at a time, the uniformity of the emitted light can be better, effectively improving the light efficiency of the display device using the backlight module 100.

[0042] In some embodiments, the rated emission color temperatures of the plurality of light-emitting unit groups are set differently; the backlight module 100 is a side-lit backlight module, and the number of light-emitting unit groups in the side-lit backlight module is 2 to 20.

[0043] It should be noted that for some display devices that pursue a thinner profile, especially mobile communication devices such as mobile phones, edge-lit backlight modules 100 are often set up on such display devices. In edge-lit backlight modules 100, the light-emitting units 10 are located on the side, and the light emitted by them enters the light guide plate and then emits light towards the display panel under the action of the light guide plate. However, due to the limited space on the side, the number of light-emitting units 10 that can be set up is also limited. For edge-lit backlight modules, the number of light-emitting unit groups cannot be too large, otherwise it will affect the display effect of the display device using the backlight module 100.

[0044] Therefore, in this embodiment, the number of light-emitting unit groups in the side-lit backlight module is 2 to 20, thereby avoiding setting too many light-emitting unit groups and affecting the display effect of the display device.

[0045] The rated emission color temperatures of the multiple light-emitting unit groups are set differently, that is, the rated emission color temperatures of any two of the multiple light-emitting unit groups are different. This setting can provide as many combinations of rated emission color temperatures as possible, so that the light emitted by the display device is closer to the natural spectrum.

[0046] In some embodiments, the side-lit backlight module has 6 groups of light-emitting units, and its rated emission color temperature is 2700~6500k.

[0047] In the scheme of this embodiment, considering the small size of mobile communication devices such as mobile phones, when using a side-lit backlight module 100, the number of LEDs is small. If there are too many groups, it will inevitably affect the display effect of mobile communication devices such as mobile phones. Therefore, the number of light-emitting unit groups is set to 6 groups. On the one hand, the rated light emission color temperature can be set as many times as possible. On the other hand, the display effect of mobile communication devices such as mobile phones can also be guaranteed.

[0048] Current research indicates that the color temperature of natural light is generally between 3000K and 6500K. Therefore, setting the rated color temperature of the side-lit backlight module to 2700-6500K can cover the color temperature range of natural light, allowing for higher color fidelity when simulating natural light.

[0049] Specifically, it should be noted that the rated color temperature of the 6 groups of light-emitting units is not limited and can be any value between 2700 and 6500k, and is not limited here.

[0050] In some embodiments, the rated emission color temperatures of the six groups of light-emitting units are 2700K, 3000K, 4000K, 5000K, 5700K, and 6500K, respectively.

[0051] It should be noted that when the rated color temperature of the light-emitting unit group is 2700K, it means that the rated color temperature of the light-emitting unit group is a value around 2700K. It does not exclude values ​​such as 2701K and 2699K, which have the same effect. Similarly, when the rated color temperature of the light-emitting unit group is 3000K, 4000K, etc., the same applies.

[0052] Please refer to the details. Figure 3 The six groups of light-emitting units include a first group of light-emitting units composed of a first light-emitting unit 11, a second group of light-emitting units composed of a second light-emitting unit 12, a third group of light-emitting units composed of a third light-emitting unit 13, a fourth group of light-emitting units composed of a fourth light-emitting unit 17, a fifth group of light-emitting units composed of a fifth light-emitting unit 18, and a sixth group of light-emitting units composed of a sixth light-emitting unit 19. The rated color temperature of the first light-emitting unit 11 is 2700K, the rated color temperature of the second light-emitting unit 12 is 3000K, the rated color temperature of the third light-emitting unit 13 is 4000K, the rated color temperature of the fourth light-emitting unit 17 is 5000K, the rated color temperature of the fifth light-emitting unit 18 is 5700K, and the rated color temperature of the sixth light-emitting unit 19 is 6500K.

[0053] In the scheme of this embodiment, by setting the rated emission color temperatures of the six groups of light-emitting units to 2700K, 3000K, 4000K, 5000K, 5700K and 6500K respectively, the continuity of the backlight module 100 in imitating the natural spectrum can be improved.

[0054] It should be emphasized that the backlight module 100 can be direct-lit or side-lit. When the backlight module 100 is a direct-lit backlight module 100, the multiple light-emitting units 10 can be randomly distributed or distributed in multiple areas, etc., which are not limited here.

[0055] In some embodiments, the backlight module 100 includes a back plate 20, which defines a plurality of light-emitting areas. A plurality of light-emitting units 10 are disposed in the plurality of light-emitting areas, and the light-emitting units 10 located in the same light-emitting area have the same rated color temperature. The plurality of light-emitting areas have a plurality of rated color temperatures.

[0056] In the scheme of this embodiment, by defining multiple light-emitting areas on the back plate 20, and the light-emitting units 10 located in the same light-emitting area have the same rated color temperature, each light-emitting area can be controlled individually to obtain the desired color temperature.

[0057] Specifically, the multiple light-emitting areas have multiple rated color temperatures. Each light-emitting area may have a rated color temperature, and any two light-emitting areas may have different rated color temperatures. Alternatively, the number of light-emitting areas may be different from the number of rated color temperatures. For example, there may be five light-emitting areas with a total of three rated color temperatures, etc. No limitation is made here.

[0058] Furthermore, the number of light-emitting areas can be set differently for different display devices. In some embodiments, when the display device is a television of 40 inches or larger, the number of light-emitting areas can be set to 2,000 to 4,000; when the display device is a mobile communication device such as a mobile phone, the number of light-emitting areas can be set to 50 to 100; when the display device is a tablet, the number of light-emitting areas can be set to 100 to 500; and when the display device is a computer monitor, the number of light-emitting areas can be set to 500 to 2,000.

[0059] In some embodiments, the driving device is configured to output multiple driving voltages. It is understood that the color temperature of the light output by the light-emitting unit 10 is different under different driving voltages. Therefore, in this embodiment, the driving device is configured to output multiple driving voltages. For example, the driving device is provided with three driving voltages: 3V, 5V, and 9V. The rated voltage of our multiple light-emitting units 10 is 5V, and the corresponding rated color temperatures are 2700K and 6500K. In this way, when we drive them with the rated voltage of 5V, we can provide a color temperature of 2700K and / or 6500K, while when driven by 3V or 9V, we can provide other color temperatures. Thus, although we only set two rated color temperature light-emitting units 10, we can output light with 3 times 2, that is, 6 color temperatures.

[0060] This utility model also proposes a display device, which includes a backlight module 100. The specific structure of the backlight module 100 is as described in the above embodiments. Since this display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0061] In some embodiments, the display device includes a mobile communication device.

[0062] It is understandable that mobile communication devices, such as mobile phones, are devices that are closely related to users' lives. When the backlight module 100 provided in this application is used, the light emission of the mobile communication device can be closer to the natural spectrum, so that users are less likely to experience eye fatigue when using the mobile communication device, thus improving the user experience.

[0063] The backlight module 100 and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A backlight module, characterized in that, include: Multiple light-emitting units, wherein at least two of the multiple light-emitting units are configured to emit different color temperatures under the same driving voltage; as well as, A driving device that drives and connects to a plurality of light-emitting units, for selectively driving at least a portion of the plurality of light-emitting units to emit light.

2. The backlight module according to claim 1, characterized in that, The plurality of light-emitting units constitute a plurality of light-emitting unit groups, and the rated light emission color temperature of the light-emitting units in each of the light-emitting unit groups is set to be the same; The driving device includes a driving module that drives each of the light-emitting unit groups individually.

3. The backlight module according to claim 2, characterized in that, The light-emitting units of the multiple light-emitting unit groups are arranged alternately.

4. The backlight module according to claim 2, characterized in that, The rated emission color temperatures of the multiple groups of light-emitting units are set differently; The backlight module is a side-lit backlight module, and the number of light-emitting unit groups in the side-lit backlight module is 2 to 20.

5. The backlight module according to claim 4, characterized in that, The side-lit backlight module has 6 groups of light-emitting units, and its rated color temperature is 2700~6500k.

6. The backlight module according to claim 5, characterized in that, The rated color temperatures of the six groups of light-emitting units are 2700K, 3000K, 4000K, 5000K, 5700K, and 6500K, respectively.

7. The backlight module according to claim 2, characterized in that, The backlight module includes a back plate, which defines multiple light-emitting areas. Multiple light-emitting units are disposed in the multiple light-emitting areas, and the light-emitting units located in the same light-emitting area have the same rated color temperature. The multiple light-emitting areas have multiple rated color temperatures.

8. The backlight module according to claim 1, characterized in that, The drive device is configured to output a variety of drive voltages.

9. A display device, characterized in that, The display device includes a backlight module as described in any one of claims 1 to 8.

10. The display device as claimed in claim 9, characterized in that, The display device includes a mobile communication device.

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