Backlight assembly and display device

Abstract

The utility model provides a backlight assembly and display equipment, the backlight assembly comprises a light guide plate, at least one first light-emitting part and at least one second light-emitting part, the light guide plate comprises a light-emitting surface, a first light-in surface and a second light-in surface, the light-emitting surface is used for emitting light to transmit a display panel, and the first light-in surface and the second light-in surface are adjacent to the light-emitting surface; the at least one first light-emitting part comprises a first light-emitting part, and the first light-emitting part is arranged towards the first light-in surface; and the at least one second light-emitting part comprises a second light-emitting part, and the second light-emitting part is arranged towards the second light-in surface. Compared with the prior art, the first light-emitting part and the second light-emitting part are arranged corresponding to the first light-in face and the second light-in face of the light guide plate correspondingly, the first light-emitting part and the second light-emitting part emit light to enter the light guide plate at the same time, the heating condition of one single light-in face can be relieved, and the heat dissipation pressure of the backlight assembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight assembly and a display device. Background Art

[0002] With the development of manufacturing technology, liquid crystal display screens are widely used in life, but the display panel of the liquid crystal display screen cannot emit light by itself, so a backlight assembly is required to illuminate the display panel. The light emitted by the backlight assembly can transmit the display panel, so that the user can clearly see the display content on the display panel.

[0003] Common backlight components usually use single-side light input, where the light source is injected through one side of the light guide plate to illuminate the display panel through the light conduction performance of the light guide plate. However, LCD screens all have a demand for brightness, and in order to ensure the brightness of the entire LCD screen, the single-sided light source needs to output at a higher power, which makes the side of the backlight component with the light source prone to overheating, affecting the normal operation of the LCD screen. Summary of the invention

[0004] The present application mainly provides a backlight assembly and a display device, which can alleviate the overheating of the backlight assembly.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a backlight assembly, including a light guide plate, at least one first light-emitting element and at least one second light-emitting element, the light guide plate including a light-emitting surface, a first light-incident surface and a second light-incident surface, the light-emitting surface is used to emit light to transmit the display panel, the first light-incident surface and the second light-incident surface are adjacent to the light-emitting surface; at least one first light-emitting element, the first light-emitting element including a first light-emitting portion, the first light-emitting portion is arranged toward the first light-incident surface; at least one second light-emitting element, the second light-emitting element including a second light-emitting portion, the second light-emitting portion is arranged toward the second light-incident surface.

[0006] In a specific embodiment, the first light incident surface is disposed opposite to the second light incident surface, and the first light exiting portion is disposed opposite to the second light exiting portion.

[0007] In a specific embodiment, the number of the first light-emitting components and the number of the second light-emitting components are both plural, the first light-emitting components are evenly arranged along the first light-entering surface, and the second light-emitting components are evenly arranged along the second light-entering surface; the outline shape of the light-emitting surface is a rectangle, and the first light-entering surface and the second light-entering surface are adjacent to the light-emitting surface through the two longer sides of the rectangle.

[0008] In a specific embodiment, the backlight assembly also includes at least one third light-emitting element, the third light-emitting element includes a third light emitting portion, the light guide plate also includes at least one third light incident surface, the third light incident surface is adjacent to the light-emitting surface, and the third light emitting portion is arranged toward the third light incident surface; wherein the first light incident surface, the second light incident surface, and the third light incident surface are evenly arranged around the light-emitting surface.

[0009] In a specific embodiment, the backlight assembly also includes a fixed frame, the fixed frame forms a mounting groove, the light guide plate is arranged in the mounting groove, the light-emitting surface is arranged opposite to the fixed frame forming the bottom of the mounting groove, the light guide plate and the fixed frame are relatively fixed, a gap is formed between the first light-entering surface and the second light-entering surface and the side wall of the mounting groove, the first light-emitting component and the second light-emitting component are arranged in the gap, and the first light-emitting component and the second light-emitting component are relatively fixed to the fixed frame forming the side wall of the mounting groove; wherein the volume of the gap is greater than the volume of the first light-emitting component and the second light-emitting component.

[0010] In a specific embodiment, the fixing frame is made of thermally conductive silicone, thermally conductive plastic, graphite and / or metal material.

[0011] In a specific implementation, the first light-emitting component and the second light-emitting component are bonded and fixed to the fixing frame by means of heat-conducting adhesive.

[0012] In a specific embodiment, the backlight assembly also includes a temperature-controlled switch, which is disposed in the mounting groove and connected to the input ends of the first light-emitting component and the second light-emitting component. When the temperature-controlled switch detects that the temperature in the mounting groove exceeds a preset safety temperature range, the temperature-controlled switch reduces the power input to the first light-emitting component and the second light-emitting component.

[0013] In a specific embodiment, the backlight assembly also includes a heat sink, which is connected to the temperature control switch, and the heat absorption end of the heat sink is arranged in the gap, and the heat release end of the heat sink is arranged outside the mounting groove; wherein, when the temperature control switch detects that the temperature in the mounting groove exceeds the safety temperature range, the heat sink is activated to transfer the heat in the mounting groove to the outside of the mounting groove.

[0014] To solve the above technical problems, another technical solution adopted in the present application is: to provide a display device, the display device comprising a display panel and a backlight assembly as described in any one of the above items, the display panel being relatively fixed to the backlight assembly, and the light emitted by the backlight assembly being transmitted to the outside through the display panel.

[0015] The beneficial effects of the present application are: different from the prior art, in the embodiment of the present application, at least one first light-emitting component is arranged corresponding to the first light incident surface of the light guide plate, and at least one second light-emitting component is arranged corresponding to the second light incident surface of the light guide plate. The first light-emitting component and the second light-emitting component cooperate to emit light, and are incident from different light incident surfaces of the light guide plate. Compared with the design in which the light-emitting components are concentrated on a single light incident surface, the heat generated by the light-emitting components can be dispersed to the two light incident surfaces, so that the backlight assembly will not be overheated on one side. At the same time, it is also beneficial to heat dissipation, thereby achieving the effect of alleviating the heat generation of the backlight assembly and improving the stability of the backlight assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a schematic diagram of the assembly structure of the backlight assembly provided by the present application;

[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of the A area in the middle;

[0019] Figure 3 It is an enlarged structural schematic diagram of the backlight assembly provided in this application.

[0020] 1. backlight assembly; 11. light guide plate; 111. light emitting surface; 112. first light incident surface; 113. second light incident surface; 12. first light emitting element; 121. first light emitting portion; 13. second light emitting element; 131. second light emitting portion; 14. fixing frame; 141. mounting groove; 142. gap; 15. thermal conductive adhesive. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is particularly noted that the following implementation methods are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following implementation methods are only some implementation methods of the present application rather than all implementation methods. All other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] The terms "first", "second" and "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, and the manner is such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the implementation mode of this application (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. The manner, such as a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0023] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] With the development of manufacturing technology, liquid crystal display screens are widely used in life, but the display panel of the liquid crystal display screen cannot emit light by itself, so a backlight assembly is required to illuminate the display panel. The light emitted by the backlight assembly can transmit the display panel, so that the user can clearly see the display content on the display panel.

[0025] Common backlight components usually use single-side light input, where the light source is injected through one side of the light guide plate to illuminate the display panel through the light transmission performance of the light guide plate. However, LCD screens all have a demand for brightness, especially those used outdoors. Due to the strong outdoor light, if the light source of the backlight component cannot emit light of sufficient intensity, the display effect of the LCD screen will be greatly affected.

[0026] Therefore, in order to ensure the brightness of the entire LCD screen, the light source on one side needs to output a larger power, which causes the side of the backlight assembly with the light source to heat up seriously due to the excessive power of the light source. When the temperature is too high, it will have an adverse effect on the normal operation of the LCD screen. In addition, since the light sources are concentrated on one side, the heat sink of the LCD screen is also under great pressure, so that the heat sink also needs to output a larger power, which greatly increases the energy consumption of the LCD screen.

[0027] In order to improve or solve the above technical problems, the inventors of the present application have proposed at least the following embodiments after long-term research.

[0028] See also Figure 1 , 2 , 3, Figure 1 It is a schematic diagram of the assembly structure of the backlight assembly provided in this application. Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of area A in the middle. Figure 3 The embodiment of the present application provides a backlight assembly (1), comprising a light guide plate (11), at least one first light emitting element (12) and at least one second light emitting element (13).

[0029] The light guide plate (11) comprises a light emitting surface (111), a first light incident surface (112) and a second light incident surface (113). The light emitting surface (111) is used to emit light to transmit a display panel, and the first light incident surface (112) and the second light incident surface (113) are adjacent to the light emitting surface (111). The first light emitting element (12) comprises a first light emitting portion (121), which is arranged toward the first light incident surface (112), so that the light emitted by the first light emitting element (12) can be incident on the light guide plate (11) through the first light incident surface (112). The second light emitting element (13) comprises a second light emitting portion (131), which is arranged toward the second light incident surface (113), so that the light emitted by the second light emitting element (13) can be incident on the light guide plate (11) through the second light incident surface (113).

[0030] In the present embodiment, at least one first light-emitting element (12) is arranged corresponding to the first light-entry surface (112) of the light guide plate (11), and at least one second light-emitting element (13) is arranged corresponding to the second light-entry surface (113) of the light guide plate (11). The first light-emitting element (12) and the second light-emitting element (13) can emit light in coordination and are incident from different light-entry surfaces of the light guide plate (11). Compared with a design in which the light-emitting elements are concentratedly arranged on a single light-entry surface, the heat generated by the light-emitting elements can be dispersed to the two light-entry surfaces, so that the backlight assembly (1) does not overheat on one side. At the same time, it is also beneficial to heat dissipation, thereby achieving the effect of alleviating the heat generation of the backlight assembly (1) and improving the stability of the backlight assembly (1).

[0031] Optionally, the light guide plate (11) can be made of a transparent polymer material, such as PC (polycarbonate) and / or PMMA (polymethyl methacrylate), or can be made of an optical fiber material to obtain a good light guiding effect.

[0032] In one embodiment, the first light incident surface (112) and the second light incident surface (113) are arranged opposite to each other, and the first light emitting portion (121) and the second light emitting portion (131) are arranged opposite to each other.

[0033] Since the light guide member cannot achieve a perfect light guiding effect, the wavelength of the light will inevitably change when it propagates in the light guide member, resulting in that the wavelength of the light transmitted through the light emitting surface (111) to the display panel is not uniform, and color difference is easily generated at the end of the display panel close to the light incident surface and the end far from the light incident surface. In this embodiment, the first light incident surface (112) and the second light incident surface (113) are arranged opposite to each other, so that light can enter from two opposite sides of the light guide plate (11), so that the wavelength of the light transmitted through the light emitting surface (111) is more uniform, and the color difference between different areas on the display panel can be reduced.

[0034] In one embodiment, the number of the first light-emitting components (12) and the number of the second light-emitting components (13) can be multiple, and the first light-emitting components (12) are evenly arranged along the first light-entering surface (112), and the second light-emitting components (13) are evenly arranged along the second light-entering surface (113), so that the incident light is evenly incident on the light guide plate (11), so that the brightness of the light emitted from each area of ​​the light-emitting surface (111) is evenly oriented, and at the same time, the heat generation positions can be evenly dispersed, thereby preventing local overheating due to the concentration of light-emitting components and reducing the heat dissipation pressure of the backlight assembly (1).

[0035] Optionally, the contour shape of the light-emitting surface (111) can also be a rectangle, and the first light-entering surface (112) and the second light-entering surface (113) are adjacent to the light-emitting surface (111) through the two longer sides of the rectangle, so that the first light-entering surface (112) and the second light-entering surface (113) are longer, thereby evenly distributing the first light-emitting component (12) and the second light-emitting component (13), further making the light intensity more uniform and reducing the heat dissipation pressure.

[0036] In one embodiment, the backlight assembly (1) further includes at least one third light emitting element, the third light emitting element includes a third light emitting portion, the light guide plate (11) further includes at least one third light incident surface, the third light incident surface is adjacent to the light emitting surface (111), and the third light emitting portion is arranged toward the third light incident surface. The first light incident surface (112), the second light incident surface (113), and the third light incident surface can be evenly arranged around the light emitting surface (111). By using the first light emitting element (12), the second light emitting element (13), and the third light emitting element evenly arranged around the light emitting surface (111), light is evenly incident on the light guide plate (11) at multiple angles, further making the light intensity more uniform and reducing the heat dissipation pressure.

[0037] In one embodiment, the backlight assembly (1) further comprises a fixed frame (14), the fixed frame (14) is formed with a mounting groove (141), and the light guide plate (11) is arranged in the mounting groove (141). The light emitting surface (111) is arranged opposite to the fixed frame (14) forming the groove bottom of the mounting groove (141), and the light guide plate (11) and the fixed frame (14) are relatively fixed. A gap (142) is formed between the first light incident surface (112) and the second light incident surface (113) and the side wall of the mounting groove (141), the first light emitting component (12) and the second light emitting component (13) are arranged in the gap (142), and the first light emitting component (12) and the second light emitting component (13) are relatively fixed to the fixed frame (14) forming the side wall of the mounting groove (141).

[0038] Through the structure provided in this embodiment, the light guide plate (11) can be fixed relative to the first light-emitting component (12) and the second light-emitting component (13) by using the mounting groove (141), so that the light energy emitted by the first light-emitting component (12) can be incident through the first light incident surface (112), and the light energy emitted by the second light-emitting component (13) can be incident through the second light incident surface (113), and the gap (142) can be used to dissipate heat from the mounting groove (141), thereby improving the stability of the backlight assembly (1).

[0039] The volume of the gap (142) can be larger than the volume of the first light-emitting component (12) and the second light-emitting component (13), thereby reserving space for the fixed frame (14), the light-emitting component and the light guide plate (11) to heat up and expand. The third light-emitting component can also be arranged in the same way.

[0040] In one embodiment, the fixing frame (14) is made of thermally conductive silicone, thermally conductive plastic, graphite and / or metal material. The metal material can be silver-plated, copper-plated, gold-plated, etc. to improve its thermal conductivity. Thus, the heat generated by the first light-emitting element (12), the second light-emitting element (13), and the third light-emitting element can be conducted away by using a material with good thermal conductivity, so that the heat is not concentrated in the mounting groove (141), thereby improving the heat dissipation performance and stability of the backlight assembly (1).

[0041] In one embodiment, the first light-emitting component (12) and the second light-emitting component (13) are bonded and fixed to the fixed frame (14) by means of a heat-conducting adhesive (15). The same is true for the third light-emitting component. Thus, the heat emitted by the first light-emitting component (12), the second light-emitting component (13) and the third light-emitting component can be promptly transferred to the fixed frame (14), thereby reducing the probability of the first light-emitting component (12), the second light-emitting component (13) and the third light-emitting component being irreversibly damaged when overheated, thereby improving the stability of the backlight assembly (1).

[0042] In one embodiment, a temperature control switch is further included, which is arranged in the mounting groove (141) and connected to the input ends of the first light-emitting element (12) and the second light-emitting element (13). When the temperature control switch detects that the temperature in the mounting groove (141) exceeds a preset safe temperature range, the temperature control switch can reduce the power input to the first light-emitting element (12) and the second light-emitting element (13), thereby alleviating the heating of the first light-emitting element (12) and the second light-emitting element (13), facilitating heat dissipation, and improving the stability of the backlight assembly (1).

[0043] Optionally, when the temperature control switch detects that the temperature in the installation groove (141) returns to a safe temperature range, the temperature control switch can control the power input to the first light-emitting element (12) and the second light-emitting element (13) to increase again, so as to ensure that the backlight assembly (1) has a certain brightness.

[0044] In one embodiment, a heat sink is further included, the heat sink is connected to the temperature control switch, the heat absorbing end of the heat sink is arranged in the gap (142), and the heat releasing end of the heat sink is arranged outside the installation groove (141).

[0045] When the temperature control switch detects that the temperature in the mounting groove (141) exceeds the safe temperature range, the heat sink can be activated to transfer the heat in the mounting groove (141) to the outside of the mounting groove (141), thereby reducing the heat generation power while dissipating the heat from the mounting groove (141), further accelerating the rate at which the temperature in the mounting groove (141) returns to the safe temperature range, and effectively improving the stability of the backlight assembly (1).

[0046] Optionally, the first light emitting element (12), the second light emitting element (13) and the third light emitting element may adopt a white light source. For a display device used outdoors, the maximum light intensity when all the first light emitting elements (12), the second light emitting elements (13) and the third light emitting elements in the backlight assembly (1) emit light together needs to be able to reach more than 1000 nits. For a display device used indoors, the maximum light intensity when all the first light emitting elements (12), the second light emitting elements (13) and the third light emitting elements in the backlight assembly (1) emit light together needs to be able to reach 600 nits.

[0047] Optionally, each of the first light-emitting element (12), the second light-emitting element (13) and the third light-emitting element may be connected via a wire or a flexible FPC board (flexible printed circuit) to facilitate control and unified power supply.

[0048] The embodiment of the present application also provides a display device, comprising a display panel and a backlight assembly (1) as described in any of the above embodiments. The display panel can be fixed relative to the backlight assembly (1), and the light emitted by the light-emitting surface (111) of the backlight assembly (1) can be transmitted to the outside through the display panel.

[0049] In the present embodiment, at least one first light-emitting element (12) is arranged corresponding to the first light incident surface (112) of the light guide plate (11), and at least one second light-emitting element (13) is arranged corresponding to the second light incident surface (113) of the light guide plate (11). The first light-emitting element (12) and the second light-emitting element (13) can emit light in coordination and are incident from different light incident surfaces of the light guide plate (11). Compared with a design in which the light-emitting elements are concentratedly arranged on a single light incident surface, the heat generated by the light-emitting elements can be dispersed to the two light incident surfaces, so that the backlight assembly (1) does not overheat on one side. At the same time, it is also beneficial to heat dissipation, thereby achieving the effect of alleviating the heat generation of the backlight assembly (1) and improving the stability of the display device.

[0050] The above description is only part of the implementation methods of the present application, and does not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A backlight assembly (1), characterized in that: include: A light guide plate (11), comprising a light emitting surface (111), a first light incident surface (112) and a second light incident surface (113), wherein the light emitting surface (111) is used to emit light to transmit a display panel, and the first light incident surface (112) and the second light incident surface (113) are adjacent to the light emitting surface (111); at least one first light-emitting element (12), the first light-emitting element (12) comprising a first light-emitting portion (121), the first light-emitting portion (121) being arranged toward the first light-incident surface (112); At least one second light-emitting element (13), the second light-emitting element (13) comprising a second light-emitting portion (131), the second light-emitting portion (131) being arranged toward the second light-incident surface (113).

2. The backlight assembly (1) according to claim 1, characterized in that: The first light incident surface (112) and the second light incident surface (113) are arranged opposite to each other, and the first light emitting portion (121) and the second light emitting portion (131) are arranged opposite to each other.

3. The backlight assembly (1) according to claim 2, characterized in that: The number of the first light-emitting components (12) and the number of the second light-emitting components (13) are both plural, the first light-emitting components (12) are evenly arranged along the first light incident surface (112), and the second light-emitting components (13) are evenly arranged along the second light incident surface (113); The outline shape of the light-emitting surface (111) is a rectangle, and the first light-entering surface (112) and the second light-entering surface (113) are adjacent to the light-emitting surface (111) via two longer sides of the rectangle.

4. The backlight assembly (1) according to claim 1, characterized in that: The backlight assembly (1) further comprises at least one third light emitting element, the third light emitting element comprises a third light emitting portion, the light guide plate (11) further comprises at least one third light incident surface, the third light incident surface is adjacent to the light emitting surface (111), and the third light emitting portion is arranged towards the third light incident surface; Wherein, the first light incident surface (112), the second light incident surface (113), and the third light incident surface are evenly arranged around the light emitting surface (111).

5. The backlight assembly (1) according to any one of claims 1 to 4, characterized in that: Also includes a fixed frame (14), The fixed frame (14) is formed with a mounting groove (141), the light guide plate (11) is arranged in the mounting groove (141), the light emitting surface (111) is arranged relative to the fixed frame (14) forming the groove bottom of the mounting groove (141), the light guide plate (11) and the fixed frame (14) are relatively fixed, a gap (142) is formed between the first light incident surface (112) and the second light incident surface (113) and the side wall of the mounting groove (141), the first light emitting component (12) and the second light emitting component (13) are arranged in the gap (142), and the first light emitting component (12) and the second light emitting component (13) are relatively fixed to the fixed frame (14) forming the side wall of the mounting groove (141); Wherein, the volume of the gap (142) is greater than the volume of the first light-emitting component (12) and the second light-emitting component (13).

6. The backlight assembly (1) according to claim 5, characterized in that: The fixing frame (14) is made of thermally conductive silicone, thermally conductive plastic, graphite and / or metal material.

7. The backlight assembly (1) according to claim 5, characterized in that: The first light-emitting component (12) and the second light-emitting component (13) are bonded and fixed to the fixing frame (14) by means of a heat-conducting adhesive (15).

8. The backlight assembly (1) according to claim 5, characterized in that: The invention also comprises a temperature control switch, which is arranged in the installation groove (141) and connected to the input ends of the first light-emitting component (12) and the second light-emitting component (13); when the temperature control switch detects that the temperature in the installation groove (141) exceeds a preset safety temperature range, the temperature control switch reduces the power input to the first light-emitting component (12) and the second light-emitting component (13).

9. The backlight assembly (1) according to claim 8, characterized in that: Also includes heat sink, The heat sink is connected to the temperature control switch, the heat absorbing end of the heat sink is arranged in the gap (142), and the heat releasing end of the heat sink is arranged outside the installation groove (141); When the temperature control switch detects that the temperature in the installation slot (141) exceeds the safe temperature range, the heat sink is activated to transfer the heat in the installation slot (141) to outside the installation slot (141).

10. A display device, characterized in that: include: The backlight assembly (1) as claimed in claims 1 to 9; The display panel is fixed relative to the backlight assembly (1), and the light emitted by the backlight assembly (1) is transmitted to the outside through the display panel.

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