Backlight and display device

Abstract

This application provides a backlight and a display device, relating to the field of display technology. Its purpose is to alleviate the technical problem in related technologies where the viewing angle of the display device is limited due to the use of optical elements to differentiate light output areas. The backlight is configured to continuously output backlight at multiple output angles. The backlight includes at least one backlight unit, which includes a fixing member and multiple sub-light sources spaced circumferentially along the fixing member. Each sub-light source has a different light emission direction.

Description

Technical Field

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

[0002] Most glasses-free 3D display devices are based on the principle of parallax. By setting up optical elements such as cylindrical lenses or liquid crystal lenses in front of the display screen, the left and right eye views are directed to the left and right eyes of the viewer, respectively, thereby creating a stereoscopic effect.

[0003] However, this method of differentiating light output areas through space generally suffers from a narrow effective viewing angle and a limited effective viewing distance. When users deviate from the optimal viewing position, the image may become blurry, the sense of depth may be weakened, or it may even disappear. Utility Model Content

[0004] This application provides a backlight and a display device to at least alleviate the technical problem in the related art where the viewing angle of the display device is limited by setting optical elements to distinguish the light output area.

[0005] On one hand, embodiments of this application provide a backlight source configured to continuously output backlight at multiple output angles. The backlight source includes at least one backlight unit, and the backlight unit includes a fixing member and multiple sub-light sources arranged circumferentially along the fixing member, each of the sub-light sources having a different light emission direction.

[0006] In some embodiments, the angle between the light emission directions of any two adjacent sub-light sources is equal in the clockwise direction.

[0007] In some embodiments, the backlight is configured to face the display panel; the plurality of sub-light sources include a first selected sub-light source and a plurality of second selected sub-light sources, wherein the light emission direction of the first selected sub-light source is perpendicular to the plane of the display panel; wherein, along the clockwise direction, the first selected sub-light source is located between two adjacent second selected sub-light sources.

[0008] In some embodiments, along the clockwise direction, the light emission direction of the first sub-light source among the plurality of sub-light sources has a first angle with the light emission direction of the first selected sub-light source, and the light emission direction of the last sub-light source has a second angle with the light emission direction of the first selected sub-light source, wherein the first angle and the second angle are equal.

[0009] In some embodiments, the first included angle is greater than or equal to 30° and less than or equal to 45°.

[0010] In some embodiments, the plurality of sub-light sources are fixed to the outer peripheral surface of the fixing member, and the outer peripheral surface is a curved surface.

[0011] In some embodiments, the fixing member is columnar, and in some of the plurality of sub-light sources, the reverse extension line of the light emission direction of some of the sub-light sources does not intersect with the geometric center line of the fixing member.

[0012] In some embodiments, the backlight units are provided in a plurality of ways along a first direction and constitute a backlight assembly, and the plurality of backlight assemblies are spaced apart along a second direction, the second direction intersecting the first direction.

[0013] On the other hand, embodiments of this application also provide a display device, which includes a backlight as described in any of the above embodiments.

[0014] In some embodiments, the display device further includes a display panel disposed opposite the backlight.

[0015] In the backlight provided in this embodiment, the multiple sub-light sources in each backlight unit emit light in different directions. Therefore, multiple sub-light sources can be controlled to turn on sequentially in a certain order, thereby enabling the backlight to continuously output backlight from multiple output angles. By continuously outputting backlight from multiple output angles, the display panel can display corresponding images at different output angles. This ensures that the user can always receive images for both the left and right eyes at different times, regardless of their viewing angle, without the user experiencing difficulty in viewing a good 3D image due to changes in their viewing angle. Therefore, the backlight provided in this embodiment eliminates the limitation on the user's viewing angle caused by the use of optical elements to differentiate light output areas in related technologies, which is beneficial for improving the 3D image display effect of the display device. Furthermore, since the backlight outputs backlight at corresponding output angles at different times, the left and right eye images can reach the corresponding positions more accurately, reducing image crosstalk and improving the 3D image display quality. At the same time, the display device using this backlight does not require fixed optical elements (such as cylindrical lenses), thus avoiding the "mosquito net" phenomenon. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of a display device provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of a backlight provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a backlight unit according to some embodiments of this application; Figure 4 This is a schematic diagram of the light emission direction of multiple sub-light sources in a backlight unit according to some embodiments of this application. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The described technical solutions are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0019] In the description of this application, it should be understood that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms "multiple" and similar words mean two or more, unless otherwise expressly defined.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] The various embodiments of this application are similar, and features from different embodiments and / or different examples can be combined with each other.

[0022] Related technologies typically employ a cylindrical lens placed in front of the display screen to achieve glasses-free 3D display. However, the direction of the light emitted by the display screen is fixed, and the left and right eyes can only receive the correct parallax image within specific angles and areas. If the user is outside this specific angle and area range, problems such as blurry images and poor stereoscopic display effects will occur.

[0023] Furthermore, because the cylindrical lens has a periodic structure, the light emitted from the display screen will undergo diffraction or interference when passing through it. This results in the image presented to the user being superimposed with the shadow of the cylindrical lens structure, forming a grid-like interference similar to a mosquito net, thus causing the mosquito net phenomenon.

[0024] Based on this, some embodiments of this application provide a backlight and a display device to at least alleviate the technical problem in the related art where the viewing angle of the display device is limited by setting optical elements to distinguish the light output area.

[0025] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a display device provided in some embodiments of this application. The display device 1000 includes a backlight 100 and a display panel 200 located on one side of the backlight 100. The backlight 100 can provide backlight to the display panel 200 so that the display device 1000 can display an image. As an example, the display panel 200 faces the backlight 100, thereby effectively receiving light from the backlight 100.

[0026] In some examples, the display device 1000 also includes a mounting frame 300, in which the display panel 200 and the backlight 100 are both fixed.

[0027] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a backlight provided in some embodiments of this application. The backlight 100 is configured to continuously output backlight at multiple output angles. The backlight 100 includes at least one backlight unit 10.

[0028] like Figure 3 As shown, Figure 3 This is a schematic diagram of the backlight unit 10. The backlight unit 10 includes a fixing member 11 and a plurality of sub-light sources 12 arranged circumferentially along the fixing member 11, each sub-light source 12 having a different light emission direction. Since the light emission direction of each sub-light source 12 is different, the backlight source 100 can output backlight at different output angles by controlling the activation of different sub-light sources 12.

[0029] It is worth noting that the output angle of the backlight 100 represents the angle between the overall light emission direction of the backlight 100 and the direction perpendicular to the plane where the backlight 100 is located (hereinafter referred to as the positive direction). When the backlight 100 is directly facing the display panel 200, the plane where the backlight 100 is located is parallel to the plane where the display panel 200 is located. The output angle of the backlight 100 is related to the light emission direction of the sub-light source 12 that participates in light emission. For example, when the backlight 100 includes a backlight unit 10, the light emission direction of the sub-light source 12 that is turned on in the backlight unit 10 is the light emission direction of the backlight 100, and the output angle of the backlight 100 is the angle between the light emission direction of the backlight and the square. In addition, the light emission direction of the sub-light source 12 can refer to the optical axis direction of the sub-light source 12, and the light emitted by the sub-light source 12 has the highest concentration on its optical axis.

[0030] For the backlight 100 provided in this application embodiment, since the multiple sub-light sources 12 in its backlight unit 10 have different light emission directions, the multiple sub-light sources 12 can be controlled to turn on sequentially in a certain order, thereby realizing that the backlight 100 continuously outputs backlight at multiple output angles. By continuously outputting backlight at multiple output angles, the display panel can display corresponding images at different output angles. This ensures that the user can always receive images for the left and right eyes at different times, regardless of their viewing angle, without the user having difficulty viewing a good 3D image due to changes in the viewing angle. Therefore, the backlight provided in this application embodiment eliminates the limitation on the user's viewing angle caused by the distinction of light output areas by setting optical elements in related technologies, which is beneficial to improving the 3D image display effect of the display device. In addition, since the backlight 100 outputs backlight at corresponding output angles at different times, the left and right eye images can reach the corresponding positions more accurately, reducing image crosstalk and improving the 3D image display quality; at the same time, the display device using this backlight 100 does not require fixed optical elements (such as cylindrical lenses), so there is no mosquito net phenomenon.

[0031] In some embodiments, please continue reading Figure 2 The backlight units 10 are provided in multiple ways along the first direction X to form a backlight assembly 10A. The multiple backlight assemblies 10A are arranged at intervals along the second direction Y, and the second direction Y intersects the first direction X. For example, the second direction Y is perpendicular to the first direction X.

[0032] In this case, the backlight 100 can have a high light output brightness, thereby ensuring that the display device 1000 has a good image display effect.

[0033] It is worth noting that when the backlight 100 includes multiple backlight units 10, at least some (e.g., all) of the sub-light sources 12 with the same light emission direction in all the backlight units 10 are turned on at one output angle, thereby enabling the backlight 100 to have high brightness at that output angle. At different times, by controlling the sub-light sources 12 with different light emission directions to be turned on, the backlight 100 can continuously output backlight at multiple output angles.

[0034] In some examples, along the first direction X, the fixing members 11 of the plurality of backlight units 10 in the backlight assembly 10A can be integrally formed. This can improve the structural stability of the backlight assembly 10A.

[0035] In some embodiments, please refer to Figure 3 In the backlight unit 10, multiple sub-light sources 12 are fixed to the outer peripheral surface of the fixing member 11, and the outer peripheral surface is curved.

[0036] This configuration allows the outer periphery of the curved surface to guide the light emission angle of the sub-light source 12, which is beneficial for controlling the light emission direction of the sub-light source 12 and fixing it. In addition, the above configuration can effectively ensure that the light emitted by the sub-light source 12 is not blocked by the fixing member 11 in the same backlight unit 10, thereby improving the light emission efficiency of the sub-light source 12.

[0037] In some examples, the fastener 11 is columnar.

[0038] For example, the fastener 11 can be a hollow columnar structure, and its internal space can be used to lay metal wires to connect the sub-light sources 12, thereby realizing the driving of different sub-light sources 12.

[0039] In some examples, among the multiple sub-light sources 12 in the backlight unit 10, the reverse extension line of the light emission direction of some sub-light sources 12 does not intersect with the geometric center line of the fixing member 11.

[0040] This configuration effectively avoids the situation where the location of the sub-light source 12 directly determines its light emission direction, thus affecting the placement of the sub-light source 12. Therefore, in this embodiment, the flexibility of the placement of the multiple sub-light sources 12 in the backlight unit 10 is effectively improved.

[0041] It is worth noting that when the backward extension of the light emission direction of all sub-light sources 12 intersects the geometric center line of the fixing member 11, if the angle between the light emission directions of two adjacent sub-light sources 12 along the clockwise direction R is 10°, then the angle between the positions of these two adjacent sub-light sources 12 and the geometric center of the fixing member 11 on the same plane is also 10°. However, in this embodiment, the backward extension of the light emission direction of some sub-light sources 12 does not intersect the geometric center line of the fixing member 11. Therefore, even when the angle between the light emission directions of two adjacent sub-light sources 12 along the clockwise direction R is 10°, the angle between the positions of these two adjacent sub-light sources 12 and the geometric center of the fixing member 11 on the same plane can be greater than 10°. This increases the spacing between adjacent sub-light sources 12, which is beneficial for heat dissipation.

[0042] In some embodiments, please refer to Figure 3 and Figure 4 Along the clockwise direction R, the angle between the light emission directions of any two adjacent sub-light sources 12 is equal.

[0043] This configuration ensures that the angle distribution of the light output by the backlight 100 is uniform and precise, reducing problems such as image ghosting and blurring caused by angle deviation. This allows users to obtain a good 3D viewing effect in a larger area and reduces the limitation on viewing position.

[0044] As an example, the multiple sub-light sources 12 in the backlight unit 10 are arranged in a clockwise direction R. In the clockwise direction R, the angle between the light emission directions of the first and second sub-light sources 12 is equal to the angle between the light emission directions of the second and third sub-light sources 12. Furthermore, the aforementioned angle is also equal to the angle between the light emission directions of the third and fourth sub-light sources 12.

[0045] In some examples, the angle between the light emission directions of any two adjacent sub-light sources 12 can be 4°, 5°, 6°, 7°, 8°, 9°, 10°, etc., and this application embodiment does not limit this.

[0046] like Figure 4 As shown, Figure 4 This is a schematic diagram showing the light emission directions of a plurality of sub-light sources 12 in a backlight unit 10 according to some embodiments of this application. For three consecutive sub-light sources 12 in the backlight unit 10, the light emission direction of the middle sub-light source 12 forms an angle α1 with the light emission direction of the sub-light source 12 on one side, and the light emission direction of the middle sub-light source 12 forms an angle β1 with the light emission direction of the sub-light source 12 on the other side, wherein the angles α1 and β1 are equal in magnitude.

[0047] In some embodiments, please continue reading Figure 4 The backlight unit 10 includes multiple sub-light sources 12, including a first selected sub-light source 12A and multiple second selected sub-light sources 12B. The light emission direction of the first selected sub-light source 12A is perpendicular to the plane of the display panel 200. That is, the light emitted by the first selected sub-light source 12A is perpendicular to the display panel. The light emission direction of the first selected sub-light source 12A can also be referred to as the positive direction.

[0048] Along the clockwise direction R, the first selected sub-light source 12A is located between two adjacent second selected sub-light sources 12B.

[0049] This configuration allows the second selected sub-light sources 12B on the left and right sides of the first selected sub-light source 12A to output light into the left and right eyes respectively, which is beneficial for the user to view the three-dimensional image.

[0050] In some examples, in the backlight unit 10, along the clockwise direction R, the light emission direction of the first sub-light source among a plurality of sub-light sources 12 has a first angle α2 with the light emission direction of the first selected sub-light source 12A, and the light emission direction of the last sub-light source has a second angle β2 with the light emission direction of the first selected sub-light source 12A, and the first angle α2 and the second angle β2 are equal.

[0051] This configuration ensures that the first selected sub-light source 12A is located in the middle of the plurality of sub-light sources 12 in the backlight unit 10. In other words, the number of second selected sub-light sources 12B on both the left and right sides of the first selected sub-light source 12A is equal. Under these conditions, the amount of light entering the left eye is equal to the amount of light entering the right eye among the backlight outputs from the backlight source 100 at multiple output angles, which helps to ensure the display quality of the 3D image.

[0052] Figure 4 The diagram shows that the backlight unit 10 includes seven sub-light sources 12, of which the fourth sub-light source 12 is the first selected sub-light source 12A. It is worth noting that... Figure 4 The number of sub-light sources 12 in the backlight unit 10 shown does not limit the actual number of sub-light sources 12.

[0053] In some examples, the first included angle α2 is greater than or equal to 30° and less than or equal to 45°.

[0054] The first included angle α2 represents the angle between the light output direction of the first sub-light source 12 or the last sub-light source 12 in the clockwise direction R in the backlight unit 10 and the positive direction. The larger the first included angle α2, the larger the maximum output angle of the backlight source 100, and the wider the viewing angle of the three-dimensional image. The smaller the first included angle α2, the smaller the maximum output angle of the backlight source 100, and the more concentrated the light output by the backlight source 100.

[0055] By setting the first included angle α2 to be greater than or equal to 30° and less than or equal to 45°, the viewing angle of the 3D image seen by the user can be effectively avoided, thus preventing the user's viewing experience from being too narrow. At the same time, it avoids the problem of low brightness in the 3D image seen by the user at large angles due to poor light concentration, which also affects the visual perception. Furthermore, setting the first included angle α2 within the above range can effectively match the stereoscopic vision range of the human eye, ensuring that the user's left and right eyes can receive the parallax image, thereby viewing a good 3D image.

[0056] For example, the first included angle α2 can be 30°, 32°, 34°, 35°, 36°, 38°, 40°, 42°, 44° or 45°, etc.

[0057] The display device provided in this application embodiment includes the backlight source described in any of the above embodiments, and therefore has the technical effects of the backlight source, which will not be described in detail here.

[0058] 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 source, characterized in that, The backlight is configured to continuously output backlight at multiple output angles. The backlight includes at least one backlight unit, and the backlight unit includes a fixing member and a plurality of sub-light sources arranged circumferentially along the fixing member. Each of the sub-light sources has a different light emission direction.

2. The backlight according to claim 1, characterized in that, Along the clockwise direction, the angle between the light emission directions of any two adjacent sub-light sources is equal.

3. The backlight according to claim 2, characterized in that, The backlight is configured to face the display panel; The plurality of sub-light sources includes a first selected sub-light source and a plurality of second selected sub-light sources. The light emission direction of the first selected sub-light source is perpendicular to the plane on which the display panel is located. In the clockwise direction, the first selected sub-light source is located between two adjacent second selected sub-light sources.

4. The backlight according to claim 3, characterized in that, Along the clockwise direction, the light emission direction of the first sub-light source among the plurality of sub-light sources has a first angle with the light emission direction of the first selected sub-light source, and the light emission direction of the last sub-light source has a second angle with the light emission direction of the first selected sub-light source, wherein the first angle and the second angle are equal.

5. The backlight according to claim 4, characterized in that, The first included angle is greater than or equal to 30° and less than or equal to 45°.

6. The backlight according to any one of claims 1-5, characterized in that, The plurality of sub-light sources are fixed to the outer peripheral surface of the fixing member, and the outer peripheral surface is a curved surface.

7. The backlight according to claim 6, characterized in that, The fixing member is columnar, and among the plurality of sub-light sources, the reverse extension lines of the light emission directions of some of the sub-light sources do not intersect with the geometric center line of the fixing member.

8. The backlight according to any one of claims 1-5, characterized in that, The backlight units are arranged in multiple ways along the first direction to form a backlight assembly, and the multiple backlight assemblies are arranged at intervals along the second direction, which intersects with the first direction.

9. A display device, characterized in that, include: The backlight as described in any one of claims 1-8.

10. The display device according to claim 9, characterized in that, It also includes a display panel positioned directly opposite the backlight.

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