Display device

Abstract

The invention relates to a display device which comprises a display panel used for displaying images and a backlight module used for providing a light source for the display panel, the backlight module comprises a plurality of light-emitting units, and at least one light-emitting unit comprises a first light-emitting device, a second light-emitting device, a first lens and a second lens. The first light-emitting device and the second light-emitting device are different in emergent light beam wavelength, the first lens is arranged on the first light-emitting device, and the second lens is arranged on the second light-emitting device. A distance between a center of the first light emitting device and a center of the second light emitting device is greater than a distance between a first optical center of the first lens and a second optical center of the second lens. Therefore, based on the change of the light path by the first lens or the second lens with the optical center deviating, the light spot of the first light-emitting device and the light spot of the second light-emitting device can deviate towards the center in the light-emitting area of one light-emitting unit, the non-overlapping area of the light spots is reduced, and the display quality of the display equipment is improved.

Description

Technical Field

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

[0002] With the development of electronic technology, various display devices have emerged. Display devices refer to devices with image output functions, including televisions, tablets, etc., which are widely used in various scenarios such as home, school, and business.

[0003] In a display device, multiple light-emitting units can be provided, each of which includes multiple light-emitting devices for emitting light of different colors. The light emitted by the multiple light-emitting devices can also be mixed to obtain the required color light. However, when multiple light-emitting devices in each light-emitting unit achieve color mixing, the light spots of each light-emitting device are not completely overlapped, and color cast problems are likely to occur at the edge positions, resulting in different colors of light observed from different angles, affecting the lighting effect. Summary of the invention

[0004] Based on this, it is necessary to provide a display device that can improve the luminous effect in order to solve the technical problem that the luminous effect of the traditional display device is poor.

[0005] In a first aspect, the present application provides a display device, comprising: a display panel, for displaying an image;

[0006] A backlight module, used to provide a light source for the display panel; wherein the backlight module includes a plurality of light-emitting units, at least one of which includes:

[0007] A first light emitting device and a second light emitting device, wherein the wavelengths of light beams emitted by the first light emitting device and the second light emitting device are different;

[0008] A first lens is disposed on the first light emitting device, wherein the first lens has a first optical center;

[0009] A second lens is disposed on the second light emitting device, wherein the second lens has a second optical center;

[0010] The distance between the center of the first light emitting device and the center of the second light emitting device is a first distance, and the distance between the first optical center and the second optical center is a second distance;

[0011] Wherein, the first distance is greater than the second distance.

[0012] In the above-mentioned display device, the first optical center of the first lens deviates from the center of the first light-emitting device, or the second optical center of the second lens deviates from the center of the second light-emitting device, and the first distance between the center of the first light-emitting device and the center of the second light-emitting device is smaller than the second distance between the first optical center and the second optical center. Based on the change of the light path caused by the first lens or the second lens due to the deviation of the optical center, within the light-emitting area of ​​a light-emitting unit, the light spot of the first light-emitting device and the light spot of the second light-emitting device can be shifted toward the center, so that the overlapping area of ​​the light spots of the two light-emitting devices is larger, the non-overlapping area of ​​the light spots is reduced, the color cast phenomenon at the edge of the light spots is improved, the light-emitting effect is improved, and thus the display quality of the display device is improved.

[0013] In a second aspect, the present application further provides a display device, including:

[0014] A display panel, used for displaying images;

[0015] A backlight module, used to provide light source for the display panel;

[0016] Wherein, the backlight module includes a plurality of light-emitting units, at least one of which includes:

[0017] A first light emitting device and a second light emitting device, wherein the wavelengths of light beams emitted by the first light emitting device and the second light emitting device are different;

[0018] A first lens is disposed on the first light emitting device, wherein the first lens has a first optical center;

[0019] A second lens is disposed on the second light emitting device, wherein the second lens has a second optical center;

[0020] The distance between the center of the first light-emitting device and the center of the second light-emitting device is the ninth distance, the distance between the center of the light spot formed by the first light-emitting device on the target plane and the center of the light spot formed by the second light-emitting device on the target plane is the tenth distance, the ninth distance is greater than the tenth distance, and the target plane is parallel to the surface of the substrate used to support the first light-emitting device and the second light-emitting device.

[0021] The above-mentioned display device, based on the change of the light path caused by the first lens or the second lens whose optical center is deviated, can make the light spot of the first light-emitting device and the light spot of the second light-emitting device shift toward the center within the light-emitting area of ​​a light-emitting unit, so that the overlapping area of ​​the light spots of the two light-emitting devices is larger, the non-overlapping area of ​​the light spots is reduced, the color cast phenomenon at the edge of the light spots is improved, the light-emitting effect is improved, and the display quality of the display device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments of the present application or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a display device in one embodiment;

[0024] Figure 2 is a schematic structural diagram of a light-emitting unit in one embodiment;

[0025] Figure 3 A schematic diagram of the effect of a lens changing a light path in one embodiment;

[0026] Figure 4 is a schematic structural diagram of a light emitting unit in another embodiment;

[0027] Figure 5 is a structural schematic diagram of a light emitting unit in yet another embodiment;

[0028] Figure 6 A schematic diagram of the structure of a light emitting unit in yet another embodiment;

[0029] Figure 7 It is a structural schematic diagram of a light emitting unit in another embodiment;

[0030] Figure 8 is a schematic structural diagram of a light emitting unit in an optional embodiment;

[0031] Fig. 9 is a schematic structural diagram of a light emitting unit in another optional embodiment;

[0032] Fig.10 A schematic diagram of a light path of a light emitting unit before improvement in one embodiment;

[0033] Fig.11 FIG. 1 is a schematic diagram of the light path of an improved light emitting unit in an embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0038] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0039] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0040] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0041] In one embodiment, a display device is provided, such as Figure 1 As shown, the display device includes a backlight module 100 and a display panel 200 .

[0042] The display panel 200 is located on the light-emitting side of the backlight module 100 and is used to display images. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of the light incident on the pixel unit from the backlight module 100, so that the light transmitted by all pixel units constitutes the displayed image.

[0043] The backlight module 100 is used to provide a light source for the display panel 200. The backlight module 100 can emit light uniformly in the entire light emitting surface, and is used to provide light with sufficient brightness and uniform distribution.

[0044] The above-mentioned display device can be a display product such as a liquid crystal display screen, a liquid crystal display, an instrument panel, etc., or a mobile terminal product such as a monitor, a mobile phone, a tablet computer, a smart photo album, etc. The display device uses a backlight module 100 to provide backlight, and the display panel 200 modulates the light emitted by the backlight module 100 to realize image display. In a specific application scenario, the display device can be a liquid crystal TV.

[0045] The backlight module may include a substrate, a light-emitting driving circuit arranged on the substrate, and a light-emitting device arranged on the substrate. Among them, the substrate has a bearing and supporting function. The substrate may be a printed circuit board (PCB), and the shape of the substrate may be selected according to the specific situation, for example, it may be a quadrilateral, a circle or a rectangle. The substrate is also provided with wiring to realize the electrical connection between the light-emitting device and the light-emitting driving circuit. The light-emitting driving circuit is a key part for controlling the brightness and color of the light-emitting device, and is mainly responsible for receiving external signals and converting them into signals that can drive the light-emitting device to emit light. The specific structure of the light-emitting driving circuit does not need to be limited, and those skilled in the art can set it according to the specific situation.

[0046] In actual implementation, the backlight module can be divided into zones, and the light sources in each zone can be dimmed independently, thereby achieving more refined dynamic control and improving the dynamic contrast of the liquid crystal display. The backlight module includes a plurality of light-emitting units, and at least one light-emitting unit includes a first light-emitting device, a second light-emitting device, a first lens, and a second lens.

[0047] Specifically, a light-emitting unit may include two, three, four or more light-emitting devices that emit light beams of different wavelengths, and light beams of different wavelengths are light beams of different colors. In the present embodiment, a light-emitting unit includes two light-emitting devices that emit light beams of different wavelengths, namely, a first light-emitting device and a second light-emitting device. The light-emitting unit may mix the light emitted by the various light-emitting devices it includes to obtain a mixed light of a specific color. Exemplarily, a light-emitting unit includes a red light-emitting device, a green light-emitting device and a blue light-emitting device. When the red light-emitting device, the green light-emitting device and the blue light-emitting device all emit light, the emitted red, green and blue light can be mixed to obtain white light, and the light-emitting unit can emit white light. In addition, in a light-emitting unit, the number of light-emitting devices that emit light of the same wavelength may be one or more, which is convenient for color adjustment and brightness adjustment, etc. Exemplarily, two red light-emitting devices may be included in a light-emitting unit to increase the brightness of red light. It can be understood that based on the different types of light-emitting devices included in the light-emitting unit, the color of the light emitted by the light-emitting unit is also different, which can be set according to actual needs and is not limited here.

[0048] In addition, the light emitting unit further includes a lens disposed on the light emitting device. Based on the different number of light emitting devices included in a light emitting unit, the number of lenses included in a light emitting unit may also be different.

[0049] In an optional embodiment, a light-emitting unit includes two light-emitting devices, a first light-emitting device and a second light-emitting device, and further includes a first lens disposed on the first light-emitting device and a second lens disposed on the second light-emitting device.

[0050] In another optional embodiment, a light-emitting unit includes three light-emitting devices, namely, a first light-emitting device, a second light-emitting device, and a third light-emitting device. In this case, a first optional implementation is as follows: a light-emitting unit includes two lenses, namely, a first lens and a second lens, and the first lens and the second lens are respectively arranged on two of the three light-emitting devices, and no lens is arranged on the other light-emitting device. A second optional implementation is as follows: a light-emitting unit includes three lenses, namely, a first lens, a second lens, and a third lens, and the three lenses are respectively arranged on the three light-emitting devices in a one-to-one correspondence. When a light-emitting unit includes other numbers of light-emitting devices, the number of lenses to be arranged can refer to the above implementation, and will not be repeated here.

[0051] Furthermore, the setting position of the lens needs to meet certain conditions. In the present embodiment, the first lens is arranged on the first light-emitting device, and the second lens is arranged on the second light-emitting device. That is, the lens is arranged on the light-emitting device, and can be specifically arranged on the optical path of the light-emitting device, in the area through which the light beam emitted by the light-emitting device passes. Exemplarily, in the case where the light-emitting device is arranged on a substrate, the lens can also be arranged on the substrate, covering the light-emitting device. Thus, the light beam emitted by the light-emitting device will be emitted after passing through the lens. The lens is used to change the emission angle of the light in the optical path, and based on the different refractive indices with other media, the propagation direction of the light is changed by refraction, thereby realizing the convergence or divergence of the light.

[0052] In addition, the distance between the center of the first light emitting device and the center of the second light emitting device is a first distance. The first lens has a first optical center, the second lens has a second optical center, and the distance between the first optical center and the second optical center is a second distance. The first distance is greater than the second distance.

[0053] The center of the light-emitting device refers to the geometric center of the light-emitting device. For example, if the light-emitting device is a square or a rectangle, the center of the light-emitting device refers to the intersection of the two diagonals of the light-emitting device. The optical center of a lens refers to the center point of the lens. The propagation direction of light passing through the optical center will not change. The optical center of a lens is located on the optical axis of the lens. The optical axis refers to a straight line perpendicular to the surface of the lens, passing through the center of the lens. The optical axis of the lens is also the symmetry axis of the lens. The propagation direction of light passing through the optical axis of the lens remains unchanged.

[0054] See also Figure 2 The light-emitting unit includes a first light-emitting device 112, a first lens 122, a second light-emitting device 114, and a second lens 124, and a second distance d2 between a first optical center of the first lens 122 and a second optical center of the second lens 124 is smaller than a first distance d1 between a center of the first light-emitting device 112 and a center of the second light-emitting device 114. Thus, within a light-emitting area of ​​a light-emitting unit, a light spot of a light-emitting device provided with a lens can be shifted toward a light spot of another light-emitting device, so that an overlapping area between a light spot of a light-emitting device provided with a lens and a light spot of another light-emitting device is larger, a non-overlapping area of ​​the light spot is reduced, a color cast phenomenon at an edge position of the light spot is improved, and a light-emitting effect is improved, thereby improving a display quality of a display device.

[0055] Take a light-emitting unit including two light-emitting devices, namely a red light-emitting device and a green light-emitting device, a first lens is provided on the red light-emitting device, and the first lens is a convex lens, and a second lens is provided on the green light-emitting device as an example for explanation. The optical center of the first lens is offset in the direction close to the green light-emitting device relative to the center of the red light-emitting device, and the optical center of the second lens is offset in the direction close to the red light-emitting device relative to the center of the green light-emitting device. Under the action of the first lens changing the emission angle of the red light and the second lens changing the emission angle of the green light, the red light spot formed on the target plane by the red light emitted by the red light-emitting device and the green light spot formed on the target plane by the green light emitted by the green light-emitting device are both offset toward the center, so that the overlapping area of ​​the red light spot and the green light spot is larger, and the area of ​​the edge where the red light spot does not overlap with the green light spot is reduced, thereby improving the color cast phenomenon at the edge position and improving the display effect.

[0056] Specifically, the first distance being greater than the second distance may be: the distance between the centers of the two light-emitting devices is greater than the distance between the optical centers of the two lenses. That is, the optical center of at least one of the first lens and the second lens is offset toward the center direction relative to the geometric center of the light-emitting device. For example, the first optical center of the first lens is offset toward the center direction relative to the center of the first light-emitting device, and the second optical center of the second lens is not offset relative to the center of the second light-emitting device. Alternatively, the first optical center of the first lens is offset toward the center direction relative to the center of the first light-emitting device, and the second optical center of the second lens is offset toward the center direction relative to the center of the second light-emitting device. Alternatively, the first optical center of the first lens is offset toward the center direction relative to the center of the first light-emitting device, and the second optical center of the second lens is offset toward the edge direction relative to the center of the second light-emitting device, and the offset distance between the first optical center and the center of the first light-emitting device is greater than the offset distance between the second optical center and the center of the second light-emitting device. Among them, the center direction is the direction in which the light-emitting device approaches another light-emitting device, and the edge direction is the direction in which the light-emitting device moves away from another light-emitting device. Figure 3 As shown, in different cases where the center of the light emitting device is offset from the optical center of the lens (green) or the center of the light emitting device is not offset from the optical center of the lens (blue), the lens has different effects on changing the exit angle and path of the light.

[0057] The display device provided in this embodiment includes a display panel for displaying an image, and a backlight module for providing a light source for the display panel, the backlight module includes a plurality of light-emitting units, at least one light-emitting unit includes a first light-emitting device, a second light-emitting device, a first lens, and a second lens, the wavelengths of the light beams emitted by the first light-emitting device and the second light-emitting device are different, the first lens is arranged on the first light-emitting device, the second lens is arranged on the second light-emitting device, and the distance between the center of the first light-emitting device and the center of the second light-emitting device is greater than the distance between the first optical center of the first lens and the second optical center of the second lens. Thus, the first optical center of the first lens deviates from the center of the first light-emitting device, or the second optical center of the second lens deviates from the center of the second light-emitting device, the first distance between the center of the first light-emitting device and the center of the second light-emitting device is less than the second distance between the first optical center and the second optical center, based on the change of the light path by the first lens or the second lens due to the deviation of the optical center, within the light-emitting area of ​​a light-emitting unit, the light spot of the first light-emitting device and the light spot of the second light-emitting device can be shifted toward the center, so that the overlapping area of ​​the light spots of the two light-emitting devices is larger, the non-overlapping area of ​​the light spots is reduced, the color cast phenomenon at the edge of the light spots is improved, the light-emitting effect is improved, and the display quality of the display device is improved.

[0058] In an exemplary embodiment, Figure 4 As shown, the light-emitting unit also includes a third light-emitting device 116, the distance between the first optical center and the center of the third light-emitting device 116 is a third distance, the distance between the center of the first light-emitting device 112 and the center of the third light-emitting device 116 is a fourth distance, and the third distance is smaller than the fourth distance; the distance between the second optical center and the center of the third light-emitting device 116 is a fifth distance, the distance between the center of the second light-emitting device 114 and the center of the third light-emitting device 116 is a sixth distance, and the fifth distance is smaller than the sixth distance.

[0059] Specifically, Figure 4As shown, with the center of the third light emitting device 116 as a reference, the distance between the first optical center and the center of the third light emitting device 116 is smaller than the distance between the center of the first light emitting device 112 and the center of the third light emitting device 116, and the first optical center is offset in a direction close to the third light emitting device 116 relative to the center of the first light emitting device 112. Moreover, with the center of the third light emitting device 116 as a reference, the distance between the second optical center and the center of the third light emitting device 116 is smaller than the distance between the center of the second light emitting device 114 and the center of the third light emitting device 116, and the second optical center is offset in a direction close to the third light emitting device 116 relative to the center of the second light emitting device 114. Thus, the first lens 122 can correct the light spot formed by the light emitted by the first light-emitting device 112 toward the direction of the third light-emitting device 116, and the second lens 124 can correct the light spot formed by the light emitted by the second light-emitting device 114 toward the direction of the third light-emitting device 116, thereby increasing the overlapping area of ​​the light spot formed by the light emitted by the first light-emitting device 112 and the light spot formed by the third light-emitting device 116, and also increasing the overlapping area of ​​the light spot formed by the light emitted by the second light-emitting device 114 and the light spot formed by the third light-emitting device 116, which has an obvious effect on reducing the non-overlapping area of ​​the light spot edge and a good effect on improving the color cast problem.

[0060] In an extensible manner, the offset distance between the first optical center and the center of the first light-emitting device 112 is the absolute value of the difference between the third distance and the fourth distance, and the offset distance between the first optical center and the center of the first light-emitting device 112 can be determined in combination with the fourth distance. The offset distance between the second optical center and the center of the second light-emitting device 114 is the absolute value of the difference between the fifth distance and the sixth distance, and the offset distance between the second optical center and the center of the second light-emitting device 114 can be determined in combination with the sixth distance. The offset distance is determined according to the distance between the centers of the light-emitting devices and the light distribution curve of the light-emitting devices, and the position of the lens is determined, so that the lens has a better correction effect on the spot position.

[0061] The number of the first light emitting devices 112, the second light emitting devices 114, and the third light emitting devices 116 is not unique. For example, the number of the first light emitting devices 112 may be one or more, the number of the second light emitting devices 114 may be one or more, and the number of the third light emitting devices 116 may also be one or more. In this case, the number of the light emitting devices is at least three.

[0062] Exemplarily, the first light emitting device 112 emits red light, the second light emitting device 114 emits green light, and the third light emitting device 116 emits blue light. In this case, the light emitted by the first light emitting device 112, the second light emitting device 114 and the third light emitting device 116 can be mixed to obtain white light. By controlling the brightness of the three colors of red, green and blue, rich color changes and mixing can be achieved, the colors are bright and the reduction is good, and the color performance is more outstanding than that of ordinary white light LEDs. In addition, the traditional light emitting method of using LED blue light to excite phosphors and quantum dots, although the luminous efficiency has been significantly improved, when used as white light in a color liquid crystal display backlight source, under the principle of additive color mixing, there is still obvious energy waste, especially when displaying high-saturation images, the energy waste is more serious. In comparison, the backlight liquid crystal module of the RGB three-color LED light source is conducive to further improvement in energy efficiency and color gamut of TV products.

[0063] Among the three light emitting devices, lenses are arranged on the optical paths of two of the light emitting devices, including a first lens 122 arranged on the first light emitting device 112 and a second lens 124 arranged on the second light emitting device 114. It is understood that the other light emitting device may be provided with a lens or not, which is not limited here.

[0064] In this embodiment, the light-emitting unit includes a first light-emitting device 112, a second light-emitting device 114 and a third light-emitting device 116, which can emit at least two different wavelengths of light. The distance between the first optical center of the first lens 122 and the center of the third light-emitting device 116 is smaller than the distance between the center of the first light-emitting device 112 and the center of the third light-emitting device 116. The distance between the second optical center of the second lens 124 and the center of the third light-emitting device 116 is smaller than the distance between the center of the second light-emitting device 114 and the center of the third light-emitting device 116. The first lens 122 and the second lens 124 can both improve the edge color cast, which is beneficial to greatly improve the lighting effect.

[0065] In addition to the first lens 122 and the second lens 124, in an exemplary embodiment, as Figure 5 As shown, the lens further includes a third lens 126 disposed on the third light emitting device 116 .

[0066] The third lens 126, the first lens 122 and the second lens 124 belong to the same light-emitting unit. The third lens 126 is disposed on the third light-emitting device 116 and can change the emission angle of the light emitted by the third light-emitting device 116, for example, to expand the emission angle of the light emitted by the third light-emitting device 116 to expand the spot area of ​​the third light-emitting device 116.

[0067] The arrangement of the third light emitting device 116 and the third lens 126 is not unique, and optionally, the center of the third light emitting device 116 may not be offset relative to the optical center of the third lens 126, or the center of the third light emitting device 116 may be offset relative to the optical center of the third lens 126. The specific arrangement may be determined in combination with the arrangement of the first light emitting device 112, the second light emitting device 114, and the third light emitting device 116, or according to actual needs, and is not limited here.

[0068] In this embodiment, the lens further includes a third lens 126 disposed on the optical path of the third light emitting device 116. The third lens 126 can change the emission angle of the light emitted by the third light emitting device 116, which is beneficial to improving the display quality.

[0069] The arrangement of the first light emitting device 112, the second light emitting device 114 and the third light emitting device 116 is not unique. In an optional embodiment, Figure 5 As shown, the first light emitting device 112 , the second light emitting device 114 and the third light emitting device 116 are arranged linearly, and the third light emitting device 116 is disposed between the first light emitting device 112 and the second light emitting device 114 .

[0070] Thus, the first light-emitting device 112, the third light-emitting device 116 and the second light-emitting device 114 are arranged in sequence and are all located on a straight line, so that the light emitted by the first light-emitting device 112, the third light-emitting device 116 and the second light-emitting device 114 can be mixed along the straight line direction to improve the consistency of color mixing. In addition, the linear arrangement method is also conducive to simplifying the manufacturing process, reducing production costs and improving production efficiency.

[0071] In this embodiment, the first light-emitting device 112, the second light-emitting device 114 and the third light-emitting device 116 are arranged linearly, and the third light-emitting device 116 is disposed between the first light-emitting device 112 and the second light-emitting device 114, so that the light emitted by the first light-emitting device 112, the third light-emitting device 116 and the second light-emitting device 114 can be mixed along a straight line direction to improve the consistency of color mixing. The first lens 122 and the second lens 124 can expand the overlapping area of ​​the light spots of the first light-emitting device 112, the second light-emitting device 114 and the third light-emitting device 116, which is beneficial to improving the display quality.

[0072] In another optional embodiment, if Figure 6As shown, the first light emitting device 112, the second light emitting device 114 and the third light emitting device 116 are respectively located at the three vertices of the same triangle, so that the first light emitting device 112, the second light emitting device 114 and the third light emitting device 116 are arranged in a triangle, and the shape of the triangle is not limited. In this arrangement, the spacing between the light emitting devices is small, and the overlap of the light spots is relatively higher. Correspondingly, if the first light emitting device 112, the second light emitting device 114 and the third light emitting device 116 are arranged in a triangle, a lens can be set on the light path of one light emitting device, two light emitting devices or three light emitting devices. Figure 6 The figure shows the case where lenses are arranged on the optical paths of two light emitting devices. The distance between the optical centers of at least two lenses and the center of another light emitting device is smaller than the distance between the centers of the two light emitting devices provided with the lenses and the center of the other light emitting device, so that the light spots formed by the light emitting devices provided with the lenses are corrected in the direction close to the geometric center of the triangle, thereby improving the overlap of the light spots of each light emitting device.

[0073] In this embodiment, the first light emitting device 112, the second light emitting device 114 and the third light emitting device 116 are respectively located at the three vertices of the same triangle. In this arrangement, the spacing between the light emitting devices is small, the light spot overlap is relatively higher, and the display effect is good.

[0074] Further, in an exemplary embodiment, the third lens 126 has a third optical center, the distance between the third optical center and the center of the first light-emitting device 112 is a seventh distance, the distance between the center of the third light-emitting device 116 and the center of the first light-emitting device 112 is an eighth distance, and the difference between the seventh distance and the eighth distance is within the allowable error range.

[0075] The allowable error range is a smaller range, and the specific value of the allowable error range can be set according to actual conditions. The difference between the seventh distance and the eighth distance is within the allowable error range, indicating that the seventh distance is equal to the eighth distance, or the difference between the seventh distance and the eighth distance is very small.

[0076] When the difference between the distance between the third optical center and the center of the first light emitting device 112 and the distance between the center of the third light emitting device 116 and the center of the first light emitting device 112 is within the allowable error range, it indicates that the distance between the optical center of the third lens 126 and the center of the first light emitting device 112 and the distance between the center of the third light emitting device 116 and the center of the first light emitting device 112 are almost equal, the center of the third light emitting device 116 coincides with the projection of the optical center of the third lens 126 on the substrate, or the distance between the projection of the optical center of the third lens 126 on the substrate is very small. Since the third light emitting device 116 is located between the first light emitting device 112 and the second light emitting device 114, the third optical center of the third lens 126 may not be offset relative to the center of the third light emitting device 116, so that the light spot formed by the light emitted by the third light emitting device 116 is at the original position.

[0077] In this embodiment, the distance between the third optical center and the center of the first light emitting device 112 is the seventh distance, the distance between the center of the third light emitting device 116 and the center of the first light emitting device 112 is the eighth distance, and the difference between the seventh distance and the eighth distance is within the allowable error range. In the structure thus formed, the third optical center of the third lens 126 is almost not offset relative to the center of the third light emitting device 116, and the implementation difficulty is small.

[0078] In an optional embodiment, if Figure 7 As shown, the first lens 122, the second lens 124 and the third lens 126 are integrally formed, and the structure formed after molding can be regarded as the lens 120. Since the volume of the light-emitting device is usually small, if the light-emitting device is glued separately to form a lens, the processing difficulty is large and the designability is poor. Therefore, in this embodiment, the first lens 122, the second lens 124 and the third lens 126 are integrally formed, which reduces the processing difficulty.

[0079] The method of integrally forming the first lens 122, the second lens 124 and the third lens 126 is not unique. For example, after applying glue on the optical path of the light-emitting device, the shape design is completed by molding to form a lens that meets the conditions. Alternatively, a finished lens that meets the conditions can be made first, and then the finished lens is set on the optical path of the light-emitting device, for example, by gluing it to the substrate where the light-emitting device is located, so that the finished lens is located on the optical path of the light-emitting device. In an extensible manner, the lens can be a silicone lens or a plastic lens, etc., which is not limited here.

[0080] In this embodiment, the first lens 122, the second lens 124 and the third lens 126 are integrally formed to form an integrated structure, thereby reducing the difficulty of processing.

[0081] The shapes of the lenses mentioned in the above embodiments, such as the first lens, the second lens and the third lens, are not limited. Exemplarily, the lens is a convex lens or a concave lens. In an exemplary embodiment, the first lens is a convex lens or a concave lens, and the second lens is a convex lens or a concave lens. Among them, a convex lens refers to a lens that is thicker in the center than at the edge. Taking the lens disposed on a substrate as an example, the intersection of the optical axis of the convex lens and the lens surface is the highest point of the lens thickness. A concave lens is a lens that forms a concave structure at the top of the convex lens, such as Figure 8 Taking the lens disposed on the substrate as an example, the intersection of the optical axis of the concave lens and the lens surface is located at the center of the concave structure.

[0082] In this embodiment, the lens is a convex lens or a concave lens, and both can change the emission angle of the light in the optical path, thereby playing a role in correcting the position of the light spot.

[0083] Further, in one embodiment, the first lens and the second lens have the same structure. It can be understood that the first lens and the second lens have the same structure means that the first lens and the second lens have the same shape and are equal or similar in size. For example, the first lens and the second lens are both convex lenses.

[0084] In this embodiment, the first lens and the second lens have the same structure, which can reduce the difficulty of manufacturing the light-emitting unit and improve production efficiency.

[0085] In an embodiment, the first lens or the second lens is provided with a color conversion material, such as Fig. 9 As shown, a color conversion material 130 is disposed in the first lens 122, and the color conversion material 130 is used to convert the wavelength of light emitted from the light emitting device having the lens disposed on the optical path.

[0086] It can be understood that, when there are multiple lenses, for example, including a first lens, a second lens, and a third lens, one or more of the lenses may be provided with the color conversion material 130, and the other lenses may not be provided with the color conversion material 130. Alternatively, the color conversion material 130 may be provided in all the lenses, which may be determined according to the lighting requirements.

[0087] After the light emitted by the light emitting device passes through the lens, the wavelength of the light emitted by the light emitting device can be converted under the action of the color conversion material 130 set in the lens, thereby converting the color of the emitted light to meet more display color requirements. In addition, through the joint action of the light emitting device and the color conversion material 130, light of a specific color can be obtained. Therefore, the first color of light can be obtained by using a low-cost light emitting device with a specific color conversion material 130, replacing the need for the first color of light emitted by a high-cost light emitting device, which is conducive to reducing the overall cost of use, providing a variety of feasible structural options, and improving the flexibility of the light emitting unit structure.

[0088] In this embodiment, a color conversion material 130 is provided in the lens. The color conversion material 130 is used to convert the wavelength of light emitted by the light emitting device having the lens provided in the optical path, which can meet more display color requirements and improve the flexibility of the light emitting unit structure.

[0089] In one embodiment, a display device is also provided, including a backlight module and a display panel. The display panel is used to display an image, and the backlight module is used to provide a light source for the display panel. Among them, the backlight module includes a plurality of light-emitting units, and at least one light-emitting unit includes: a first light-emitting device, a second light-emitting device, a first lens, and a second lens. The wavelengths of the light beams emitted by the first light-emitting device and the second light-emitting device are different. The first lens is arranged on the first light-emitting device, and the first lens has a first optical center. The second lens is arranged on the second light-emitting device, and the second lens has a second optical center. The distance between the center of the first light-emitting device and the center of the second light-emitting device is the ninth distance, and the distance between the center of the light spot formed by the first light-emitting device on the target plane and the center of the light spot formed by the second light-emitting device on the target plane is the tenth distance, the ninth distance is greater than the tenth distance, and the target plane is parallel to the surface of the substrate used to carry the first light-emitting device and the second light-emitting device.

[0090] Specifically, a light-emitting unit may include two, three, four or more light-emitting devices that emit light beams of different wavelengths, and light beams of different wavelengths are light beams of different colors. In the present embodiment, a light-emitting unit includes two light-emitting devices that emit light beams of different wavelengths, namely, a first light-emitting device and a second light-emitting device. The light-emitting unit may mix the light emitted by the various light-emitting devices it includes to obtain a mixed light of a specific color. Exemplarily, a light-emitting unit includes a red light-emitting device, a green light-emitting device and a blue light-emitting device. When the red light-emitting device, the green light-emitting device and the blue light-emitting device all emit light, the emitted red, green and blue light can be mixed to obtain white light, and the light-emitting unit can emit white light. In addition, in a light-emitting unit, the number of light-emitting devices that emit light of the same wavelength may be one or more, which is convenient for color adjustment and brightness adjustment, etc. Exemplarily, two red light-emitting devices may be included in a light-emitting unit to increase the brightness of red light. It can be understood that based on the different types of light-emitting devices included in the light-emitting unit, the color of the light emitted by the light-emitting unit is also different, which can be set according to actual needs and is not limited here.

[0091] In addition, the light-emitting unit further includes a lens disposed on the light-emitting device. Based on the different number of light-emitting devices included in a light-emitting unit, the number of lenses included in a light-emitting unit may also be different. In an optional embodiment, a light-emitting unit includes two light-emitting devices, a first light-emitting device and a second light-emitting device, and further includes a first lens disposed on the first light-emitting device and a second lens disposed on the second light-emitting device.

[0092] Furthermore, the setting position of the lens needs to meet certain conditions. In this embodiment, the distance between the center of the first light-emitting device and the center of the second light-emitting device is the ninth distance, the distance between the center of the light spot formed by the first light-emitting device on the target plane and the center of the light spot formed by the second light-emitting device on the target plane is the tenth distance, the ninth distance is greater than the tenth distance, and the target plane is parallel to the surface of the substrate for carrying the light-emitting device.

[0093] The light emitted by the light emitting device can form a light spot on the target plane, and the target plane can be the receiving surface of the diffusion plate. In addition, the target plane is usually parallel to the surface of the substrate used to carry the light emitting device, which is conducive to making the obtained light more uniform.

[0094] In the absence of a lens, Fig.10 As shown, when the light distribution curves of two light emitting devices are the same and the light emitting angles of the two light emitting devices are equal, the distance between the centers of the two light emitting devices is generally equal to the distance between the centers of the light spots formed by the two light emitting devices on the target plane. Fig.10The three ellipses formed by the dotted lines in the figure are light spots formed by the light emitted by the three light-emitting devices. The point in the light spot is the center of the light spot. In this case, the three light spots cannot overlap well. In this embodiment, a first lens is provided on the first light-emitting device, and a second lens is provided on the second light-emitting device, so that the distance between the center of the first light-emitting device and the center of the second light-emitting device is greater than the distance between the center of the light spot formed by the first light-emitting device on the target plane and the center of the light spot formed by the second light-emitting device on the target plane, that is, the distance between the centers of the two light spots is made smaller to increase the overlapping area of ​​the two light spots, reduce the non-overlapping area of ​​the light spots, improve the color cast phenomenon at the edge of the light spots, improve the light-emitting effect, and thus improve the display quality of the display device.

[0095] In this embodiment, based on the change in the light path caused by the first lens or the second lens due to the deviation of the optical center, the light spot of the first light-emitting device and the light spot of the second light-emitting device can be shifted toward the center within the light-emitting area of ​​a light-emitting unit, so that the overlapping area of ​​the light spots of the two light-emitting devices is larger, the non-overlapping area of ​​the light spots is reduced, the color cast phenomenon at the edge of the light spots is improved, the light-emitting effect is improved, and the display quality of the display device is improved.

[0096] In order to better understand the above embodiment, a detailed explanation is given below in conjunction with a specific embodiment. In one embodiment, a display device is provided, including a display panel and a backlight module, the backlight module includes a plurality of light-emitting units, one light-emitting unit includes three light-emitting devices that emit light of different wavelengths, namely a red light-emitting device, a green light-emitting device and a blue light-emitting device, and the light-emitting unit also includes a lens.

[0097] For example, Figure 4 As shown, in an optional solution, at least one light-emitting unit includes three light-emitting devices, and the three light-emitting devices are RGB three-color LED devices. The RGB three-color LED devices are chip-level devices, and from left to right, they are LED1, LED2 and LED3, which can be three RGB chips, or one or two of the chips can be RGB three-color LED devices realized by color conversion materials. LED2 is located between LED1 and LED3, and there is no glue on LED2. LED1 and LED3 are at the edge of the device, and there is a glue design above the chip. The center of the lens formed after glue dispensing is offset from the center of the chip. The material used for glue dispensing is generally a high-temperature yellowing-resistant silicone material.

[0098] After this structure is applied to the backlight module, the light spots of LED1 and LED3 can overlap well with the light spot of LED2 on the receiving surface of the diffuser plate. For the effect diagram, please refer to Fig.11, which can solve the color cast problem at the edge of RGBLED devices. The eccentric lenses of LED1 and LED3 need to be designed according to the spacing between LEDs in the backlight module, the distance from the diffuser to the light board (mixed light distance OD), and the LED light distribution curve. The shape is not limited to the spherical shape in the example, but can also be a concave cup shape.

[0099] like Figure 5 As shown, in another optional solution, at least one light-emitting unit includes three light-emitting devices, and the three light-emitting devices are RGB three-color LED devices. The RGB three-color LED devices are chip-level devices, and from left to right, they are LED1, LED2, and LED3, which can be three RGB chips, or RGB three-color LED devices realized by one or two chips through color conversion materials. LED1 and LED3 are at the edge of the device, and LED2 is between LED1 and LED3. LED1, LED2, and LED3 chips are all glued, and the glue is eccentrically glued above LED1 and LED3, and the glue is non-eccentrically glued above LED2. This structure reduces the color uniformity problem in the center while improving the uneven color at the edge.

[0100] like Figure 7 As shown, in another optional solution, at least one light-emitting unit includes three light-emitting devices, and the three light-emitting devices are RGB three-color LED devices. The RGB three-color LED devices are chip-level devices, which are LED1, LED2 and LED3 from left to right. They can be three RGB chips, or RGB three-color LED devices in which one or two chips are realized by color conversion materials. LED1 and LED3 are at the edge of the device, and LED2 is between LED1 and LED3. Considering that the RGB three-color LED device is relatively small, the dispensing process is difficult, and the dispensing lens has poor designability, another example of RGB LED device is given in this embodiment. In this embodiment, the lens adopts an integrated molding design, which can be that the silicone is dispensed on the three chips and the shape design is completed by molding; or the finished silicone lens is attached to the LED device by glue.

[0101] The display device provided in the embodiment of the present application forms a lens on the light path of the light-emitting device to change the direction of the light, thereby achieving full overlapping and mixing of RGB three-color light at the edge of the device's light spot, thereby solving the color cast problem at the edge of the RGB LED device.

[0102] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0103] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A display device, characterized in that: include: A display panel, used for displaying images; A backlight module, used to provide light source for the display panel; Wherein, the backlight module includes a plurality of light-emitting units, at least one of which includes: A first light emitting device and a second light emitting device, wherein the wavelengths of light beams emitted by the first light emitting device and the second light emitting device are different; A first lens is disposed on the first light emitting device, wherein the first lens has a first optical center; A second lens is disposed on the second light emitting device, wherein the second lens has a second optical center; The distance between the center of the first light emitting device and the center of the second light emitting device is a first distance, and the distance between the first optical center and the second optical center is a second distance; Wherein, the first distance is greater than the second distance.

2. The display device according to claim 1, characterized in that The light emitting unit further comprises a third light emitting device; The distance between the first optical center and the center of the third light emitting device is a third distance, the distance between the center of the first light emitting device and the center of the third light emitting device is a fourth distance, and the third distance is smaller than the fourth distance; The distance between the second optical center and the center of the third light emitting device is a fifth distance, the distance between the center of the second light emitting device and the center of the third light emitting device is a sixth distance, and the fifth distance is smaller than the sixth distance.

3. The display device according to claim 2, characterized in that The light emitting unit further includes a third lens, and the third lens is disposed on the third light emitting device.

4. The display device according to claim 3, characterized in that The first light emitting device, the second light emitting device and the third light emitting device are arranged linearly, and the third light emitting device is disposed between the first light emitting device and the second light emitting device.

5. The display device according to claim 4, characterized in that The third lens has a third optical center, the distance between the third optical center and the center of the first light-emitting device is a seventh distance, the distance between the center of the third light-emitting device and the center of the first light-emitting device is an eighth distance, and the difference between the seventh distance and the eighth distance is within an allowable error range.

6. The display device according to claim 3, characterized in that The first lens, the second lens and the third lens are integrally formed, the first lens is a convex lens or a concave lens, and the second lens is a convex lens or a concave lens.

7. The display device according to claim 6, characterized in that The first lens and the second lens have the same structure.

8. The display device according to claim 2, characterized in that The first light emitting device, the second light emitting device and the third light emitting device are respectively located at three vertices of the same triangle.

9. The display device according to any one of claims 1 to 8, characterized in that: A color conversion material is disposed in the first lens or the second lens, and the color conversion material is used to convert the wavelength of the incident light beam.

10. A display device, characterized in that: include: A display panel, used for displaying images; A backlight module, used to provide light source for the display panel; Wherein, the backlight module includes a plurality of light-emitting units, at least one of which includes: A first light emitting device and a second light emitting device, wherein the wavelengths of light beams emitted by the first light emitting device and the second light emitting device are different; A first lens is disposed on the first light emitting device, wherein the first lens has a first optical center; A second lens is disposed on the second light emitting device, wherein the second lens has a second optical center; The distance between the center of the first light-emitting device and the center of the second light-emitting device is the ninth distance, the distance between the center of the light spot formed by the first light-emitting device on the target plane and the center of the light spot formed by the second light-emitting device on the target plane is the tenth distance, the ninth distance is greater than the tenth distance, and the target plane is parallel to the surface of the substrate used to support the first light-emitting device and the second light-emitting device.

Images