CN215416207U - Display device - Google Patents
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- CN215416207U CN215416207U CN202122019685.2U CN202122019685U CN215416207U CN 215416207 U CN215416207 U CN 215416207U CN 202122019685 U CN202122019685 U CN 202122019685U CN 215416207 U CN215416207 U CN 215416207U
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Abstract
本实用新型公开了一种显示装置，包括：显示面板和背光模组；背光模组包括多个光源，光源包括：发光芯片、两个反射层、封装部和遮挡部；遮挡部位于光源的出光面上，两个反射层分别位于发光芯片的出光侧和背离出光侧的表面；其中，遮挡部对至少部分入射光线具有反射作用，可以减弱光源顶部的出射光强度，增大光源侧面出射光的强度；两个反射层的存在可以使发光芯片出射的部分光线由出光侧的反射层透射，部分光线由发光芯片的侧面出射，从而进一步增大了发光芯片光线的出射角度、减小了发光芯片中心位置处的亮度，避免了由于混光距离的减小出现的明显的灯影现象，提高了显示装置的显示效果。
The utility model discloses a display device, comprising: a display panel and a backlight module; the backlight module comprises a plurality of light sources, and the light source comprises: a light-emitting chip, two reflective layers, a packaging part and a shielding part; The two reflective layers are respectively located on the light-emitting side of the light-emitting chip and the surface away from the light-emitting side; wherein, the shielding part has a reflective effect on at least part of the incident light, which can reduce the intensity of the light emitted from the top of the light source and increase the intensity of the light emitted from the side of the light source. Intensity; the existence of the two reflective layers can make part of the light emitted by the light-emitting chip transmit through the reflective layer on the light-emitting side, and part of the light is emitted from the side of the light-emitting chip, thereby further increasing the light-emitting angle of the light-emitting chip and reducing the light-emitting chip. The brightness at the center position avoids the obvious lamp shadow phenomenon due to the reduction of the light mixing distance, and improves the display effect of the display device.
Description
Technical Field
The utility model relates to the technical field of display, in particular to a display device.
Background
With the rapid progress of Liquid Crystal Display (LCD) manufacturing technology and the advantages of being light, thin, power-saving, and radiation-free, LCD displays are widely used in various electronic products such as notebook computers, digital cameras, digital camcorders, mobile phones, computer screens, and LCD tvs. However, since the lcd panel in the lcd is a non-self-luminous display panel, the display function can be generated only by the light source provided by the backlight module.
Currently, the commonly used backlight modules include a side-in type backlight module and a direct type backlight module. In the direct type backlight module, in order to ensure the uniformity of the brightness of the display image, a certain light mixing distance needs to be set between the light sources and the diffusion plate, however, the development requirement of the thinning of the display device is met, the light mixing distance is reduced under the condition that the quantity of the light sources is unchanged and the distance between the light sources is unchanged, so that the upper position of the light sources is slightly bright, the joint position of two adjacent light sources is slightly dark, and the display effect of the display device is not uniform.
SUMMERY OF THE UTILITY MODEL
In some embodiments of the present invention, a display device includes: the display device comprises a display panel and a backlight module; the backlight module comprises a plurality of light sources, and the light sources comprise: the LED chip comprises a light emitting chip, two reflecting layers, a packaging part and a shielding part; the shielding part is positioned on the light emitting surface of the light source, and the two reflecting layers are respectively positioned on the light emitting side of the light emitting chip and the surface departing from the light emitting side; the shielding part has a reflection effect on at least part of incident light, the emergent light intensity at the top of the light source can be weakened, and the light reflected by the shielding part can be reflected again when reaching the bottom of the light source and finally emitted out from the side face of the light source, so that the intensity of the emergent light at the side face of the light source is increased; the existence of the two reflecting layers can enable most light rays to be emitted out of the side face of the light emitting chip, the light emitting angle of the light source is further increased, the light intensity of each position in the light emitting range is homogenized, the obvious lamp shadow phenomenon caused by the reduction of the light mixing distance is avoided, and the display effect of the display device is improved.
In some embodiments of the present invention, the two reflective layers are bragg reflective layers. The reflecting layer is formed by alternately stacking two first medium layers and two second medium layers with different refractive indexes. The two reflective layers include: a first reflective layer and a second reflective layer. The first reflection layer is positioned on the surface of one side, close to the circuit layer, of the light-emitting chip, and the second reflection layer is positioned on the surface of one side, away from the circuit layer, of the light-emitting chip. The reflectivity of the first reflecting layer is greater than that of the second reflecting layer, and the reflectivity of the first reflecting layer is greater than or equal to 90%, so that the most of light incident to the first reflecting layer can be reflected, the light incident to the second reflecting layer is partially transmitted, most of light is reflected, and the phenomenon that the brightness of the center of the light-emitting chip is too dark can be prevented.
In some embodiments of the utility model, the backlight module further comprises a back plate, and an overlapping region exists between the orthographic projection of the shielding part on the back plate and the orthographic projection of the light emitting chip on the back plate, so that light emitted by the light emitting chip can be ensured to be reflected by the shielding part when entering the overlapping region above the light emitting chip, the emergent light intensity at the top of the light source is reduced, and the light reflected by the shielding part can be reflected again when reaching the bottom of the light source and finally emitted out from the side surface of the light source, thereby avoiding the problems of slightly bright upper part of the light source and slightly dark joint position of two adjacent light sources.
In some embodiments of the utility model, the shielding part is in a central symmetry structure, and the light rays emitted by the light source after being shielded by the shielding part are also symmetrical, so that the light rays emitted by the display device are more uniform, and the display effect of the display device is improved.
In some embodiments of the present invention, the parameters of the shielding portion satisfy the conditions of the light intensity distribution of the light emitted from the light source; wherein, the parameters of the shielding part comprise: location, material, shape, concentration, thickness, and reflectivity. For example, the thickness of the middle of the shielding part can be set to be larger than the thicknesses of the two ends, so that the intensity of reflected light in the middle area of the shielding part can be increased, and when light enters the middle area of the shielding part, most of the light is reflected, so that the emergent light intensity in the middle area of the light source is weakened; the problems of over-brightness of the light sources and dark of the joint position of two adjacent light sources can be further avoided.
In some embodiments of the present invention, the encapsulation portion may be an encapsulation bracket; the shielding part can be a diffusion layer, the diffusion plate is internally provided with scattering particle materials, and light rays incident to the scattering particle materials can be refracted and reflected continuously, so that the effect of scattering the light rays is achieved, and the problem that the upper part of a light source is slightly bright can be avoided; in addition, the light reflected to the bottom of the light source by the scattering particle material can be reflected again and finally emitted out from the side face of the light source, so that the intensity of the light emitted from the side face of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the present invention, the shielding portion may also be a reflective layer, the reflective layer includes a matrix and reflective particles, the reflective particles have a reflective effect on incident light, when the light is incident on the shielding portion, a part of the incident light will be incident on the reflective particles and reflected by the reflective particles, thereby reducing the intensity of emergent light from the top of the light source; and when the light reflected by the reflected particles reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the utility model, the packaging part is packaging adhesive covered on the surface of the light emitting chip, the shielding part is made of material with light reflection property, such as white ink, when light is incident to the shielding part, part of incident light can be incident to the white ink and reflected by the white ink, so that the emergent light intensity at the top of the light source is weakened; and when the light reflected by the white ink reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
In some embodiments of the utility model, the white ink is located inside the encapsulation adhesive, after the encapsulation adhesive is dispensed on the surface of the light emitting chip, the white ink is dispensed on the surface of the encapsulation adhesive before the encapsulation adhesive is solidified, and the white ink flows into the encapsulation adhesive to form the shielding part because the encapsulation adhesive and the white ink both have fluidity. The shielding part is positioned inside the packaging adhesive, so that the shielding part can be fixed more firmly, and the service life of the display device is prolonged.
In some embodiments of the utility model, the white ink is positioned on the surface of the packaging adhesive, and after the packaging adhesive is solidified, the white ink is applied to the top of the shielding part to form the shielding part.
In some embodiments of the present invention, the backlight module further comprises: the light-emitting device comprises a circuit board, a light reflecting layer, a diffusion plate and an optical diaphragm; the circuit board is positioned on the back plate and used for providing a driving signal; the light reflecting layer is positioned on one side of the circuit board close to the light source and comprises a plurality of openings for exposing the light source; the diffusion plate is positioned on the light emitting side of the light source and is away from the light source by a specific distance; the optical film is positioned on one side of the diffusion plate, which is far away from the light source; wherein, the light source is a light emitting diode or a micro light emitting diode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the utility model;
FIG. 3 is a schematic cross-sectional view of a light source according to an embodiment of the present invention;
FIG. 4 is a second schematic cross-sectional view of a light source according to an embodiment of the present invention;
fig. 5 is a third schematic cross-sectional view illustrating a light source according to an embodiment of the utility model;
FIG. 6a is a fourth schematic cross-sectional view of a light source according to an embodiment of the present invention;
FIG. 6b is a fifth schematic cross-sectional view of a light source according to an embodiment of the present invention;
FIG. 6c is a sixth schematic cross-sectional view of a light source according to an embodiment of the present invention;
FIG. 7a is a seventh schematic cross-sectional view of a light source according to an embodiment of the present invention;
fig. 7b is an eighth schematic cross-sectional view of a light source according to an embodiment of the utility model.
The backlight module comprises a backlight module 100, a display panel 200, a back panel 11, a circuit board 12, a light source 13, a light reflecting layer 14, a diffusion plate 15, an optical film 16, a shielding part 131, a light emitting chip 132, a packaging part 133, a first reflecting layer 1341 and a second reflecting layer 1342.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
The liquid crystal display mainly comprises a backlight module and a liquid crystal display panel. The liquid crystal display panel does not emit light, and brightness display needs to be realized by a light source provided by the backlight module.
The display principle of the liquid crystal display is that liquid crystal is placed between two pieces of conductive glass, and the electric field effect of liquid crystal molecule distortion is caused by the driving of an electric field between two electrodes so as to control the transmission or shielding function of a backlight source, thereby displaying an image. If a color filter is added, a color image can be displayed.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
Referring to fig. 1, the display device includes: a backlight module 100 and a display panel 200.
The display panel 200 is located at the light emitting side of the backlight module 100, the shape and size of the display panel are generally matched with those of the backlight module, and the display panel 200 may be configured as a rectangle in general, including a top side, a bottom side, a left side and a right side, where the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the left side and one side of the right side, and the bottom side is connected to the other end of the left side and the other end of the right side.
The display panel 200 is a transmissive display panel, which can modulate the transmittance of light, but does not emit light by itself. 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 light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
The backlight module 100 is generally disposed at the bottom of the display device, and has a shape and size corresponding to those of the display device. When applied to the field of televisions or mobile terminals, the backlight module generally takes a rectangular shape.
The backlight module in the embodiment of the utility model adopts the direct type backlight module, is used for uniformly emitting light rays in the whole light emitting surface, and provides light rays with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.
Fig. 2 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the utility model.
Referring to fig. 2, the backlight assembly includes: a back plate 11, a circuit board 12, a light source 13, a light reflecting layer 14, a diffusion plate 15 and an optical film 16.
The back plate 11 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 11 is typically a rectangular structure, the shape of which is adapted to the shape of the display device when applied to a contoured display device. The back panel 11 includes a top side, a bottom side, a left side, and a right side. Wherein the antenna side is opposite to the ground side, the left side is opposite to the right side, the antenna side is connected with one end of the left side and one side of the right side respectively, and the ground side is connected with the other end of the left side and the other end of the right side respectively.
The material of the back plate 11 is aluminum, iron, aluminum alloy or iron alloy. The back plate 11 is used for supporting the circuit board 12 and supporting and fixing the edge positions of the components such as the reflective layer 14, the diffusion plate 15 and the optical film 16, and the back plate 11 also plays a role in dissipating heat of the circuit board 12.
The circuit board 12 is disposed on the back plate 11, and the shape of the circuit board 12 can be a plate or a strip, in general, the circuit board 12 is a plate, and the whole circuit board is rectangular or square, and when the circuit board is applied to a special-shaped display device, the shape and the size of the circuit board are adapted to the shape and the size of the display device.
The circuit board 12 comprises a substrate 121 and a circuit layer 122, the substrate 121 is located on the back plate 11, and the shape of the substrate 121 is the same as the overall shape of the circuit board 12. In general, the substrate 121 has a plate shape, and has a rectangular or square shape as a whole.
In the embodiment of the present invention, the substrate 121 may be made of glass with a high thermal conductivity, and the substrate 121 is made of glass with a high thermal conductivity, so that heat generated by the display device during displaying can be quickly dissipated, thereby avoiding the problem of reducing the light emitting efficiency caused by an over-high temperature. Alternatively, the substrate 121 may be made of material such as FR4 or PET, but is not limited thereto.
The circuit layer 122 provided by the embodiment of the present invention is formed by electroplating and depositing a conductive material on the substrate 121 and etching the circuit as required, and the conductive material may be copper, which is not limited herein. The conductive material will etch a fracture, and the two sides of the fracture are respectively connected with the anode and the cathode of the light source 13.
When the Circuit layer 122 is formed by the etching process, the substrate 121 and the Circuit layer 122 may form a Circuit Board, which may be a Printed Circuit Board (PCB); alternatively, when the circuit layer 122 is formed by a thin film process, the substrate 121 and the circuit layer 122 may also form an array substrate, which is not limited herein.
The light source 13 is located on the circuit layer 122, and after the circuit layer 122 is manufactured, a pad for soldering the light source 13 is formed on the surface of the circuit layer 122, and the light source 13 is soldered on the pad, so that the light source 13 is driven to emit light by controlling the driving signal of the circuit layer 122.
The backlight module provided in the embodiment of the present invention may include only one color light source 13, and may also include multiple color light sources 13, which is not limited herein.
The light reflecting layer 14 is positioned on one side of the circuit board 12 close to the light source 13, the shape and size of the light reflecting layer 14 are consistent with those of the circuit board 12, and the light reflecting layer 14 comprises a plurality of openings for exposing the light source 13 and has the property of reflecting light.
In the embodiment of the present invention, the surface of the circuit board 12 on the side away from the back plate 11 is coated with a material having a light reflecting property, and the material may be a white ink having a property of reflecting light, and the reflectivity of the white ink is greater than or equal to 85%, which is not limited herein.
In other embodiments of the present invention, the reflective layer 14 may also be a reflective sheet, and the reflective sheet is manufactured by coating a colloid mixed with reflective particles on the surface of the substrate, and the reflectivity of the reflective sheet is greater than or equal to 97%.
The reflective layer 14 provided in the embodiment of the present invention has a reflective effect on incident light, so that light reflected to one side of the reflective layer can be reflected again by the reflective layer. In some embodiments, the light reflecting layer 14 may be a diffuse reflecting layer, which makes the reflection path of the reflected light random, thereby homogenizing the light.
The diffusion plate 15 is located on the light-emitting side of the light source 13, a certain light mixing distance exists between the diffusion plate 15 and the light source 13, and the orthographic projection of the diffusion plate 15 on the back plate 11 covers the orthographic projection of the circuit board 12 on the back plate 11, namely the diffusion plate 15 is located right above the whole back plate 11. The diffusion plate 15 may be provided in a rectangular or square shape in a general case.
The diffusion plate 15 functions to diffuse incident light, and make the light passing through the diffusion plate 15 more uniform. The diffusion plate 15 is provided with scattering particle materials, and light incident to the scattering particle materials can be refracted and reflected continuously, so that the effect of scattering the light is achieved, and the effect of light uniformization is achieved.
The diffusion plate 15 has higher haze and more uniform effect, and can be processed by an extrusion process, and the material of the diffusion plate 15 is generally selected from at least one of polymethyl methacrylate (PMMA), Polycarbonate (PC), polystyrene material (PS), and polypropylene (PP).
The diffusion plate 15 may further include a quantum dot material disposed therein to form a quantum dot diffusion plate, when the light source 13 emits blue light, the quantum dot material includes a red quantum dot material and a green quantum dot material, the red quantum dot material emits red light under excitation of the blue light, the green quantum dot material emits green light under excitation of the blue light, and the excited emitted red light, green light and transmitted blue light are mixed to form a white light emission.
When the quantum dot diffusion plate is adopted, a quantum dot film is not arranged in the subsequent process of manufacturing the backlight module, so that the cost is reduced, and the display device is lighter and thinner.
The optical film 16 is located on the side of the diffuser plate 15 facing away from the light source 13, and the optical film 16 is disposed in a whole layer, and has the same shape as the diffuser plate 15, and may be disposed in a rectangular or square shape in general.
The optical film 16 can be disposed to adapt the backlight module to various practical applications.
In the present embodiment, the light source 13 may emit only blue light. At this time, the optical film 16 includes a color conversion layer such as a quantum dot layer or a fluorescent layer.
The quantum dot layer comprises a red quantum dot material and a green quantum dot material, the red quantum dot material emits red light under the excitation of blue light, the green quantum dot material emits green light under the excitation of the blue light, and the red light, the green light and the transmitted blue light which are emitted by excitation are mixed to form white light for emitting.
The fluorescent layer comprises fluorescent materials which are stimulated to emit red light and green light, and the stimulated red light, the green light and the transmitted blue light are mixed into white light to be emitted.
In addition, the optical film 16 may further include a prism sheet, which can change the exit angle of light, thereby changing the viewable angle of the display device.
The optical film 16 may further include a reflective polarizer, which is a brightness enhancement film, and can improve the brightness of the backlight module, improve the utilization efficiency of light, and make the emergent light have polarization property, thereby omitting the use of the polarizer under the lcd panel.
The optical film 16 not only can achieve the corresponding functions, but also has the atomization and covering effects.
In order to ensure the uniformity of the brightness of the display screen, a certain light mixing distance needs to be set between the light source and the diffusion plate, however, as the display device is required to be thinned, the light mixing distance is reduced by 1/n to ensure the displayThe display effect of the device, the particle number of the luminous light source needs to be increased to n2And the manufacturing cost of the display device is greatly increased. In order to avoid the increase of cost, the light mixing distance is reduced on the premise of not changing the number of the light sources, so that an obvious lamp shadow phenomenon can occur, and the display effect is influenced.
In view of the above, in the embodiment of the present invention, the light source 13 is disposed as follows, so that the light shadow problem occurring when the light mixing distance is reduced for realizing an ultra-thin design can be solved without changing the number of light sources while the display device is thinned.
Fig. 3 is a schematic cross-sectional structure diagram of a light source according to an embodiment of the present invention.
Referring to fig. 2 and 3, in the embodiment of the present invention, the light source 13 includes: a shielding portion 131, a light emitting chip 132, and a sealing portion 133.
The shielding part 131 is located at the light emitting side of the light source 13, and the shielding part 131 has a reflection effect on at least part of incident light, so that the intensity of the emergent light at the top of the light source 13 can be reduced; and when the light reflected by the shielding part 131 reaches the bottom of the light source 13, the light can be reflected again and finally emitted out from the side surface of the light source 13, so that the intensity of the light emitted from the side surface of the light source 13 is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source 13 is increased. Therefore, the problems of the light source 13 being over bright and the adjacent light source 13 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 13, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 13 used can be reduced without changing the light mixing distance, and the cost can be reduced.
In the embodiment provided by the utility model, an overlapping region exists between the front projection of the shielding portion 131 on the back plate 11 and the front projection of the light emitting chip 132 on the back plate 11, so that the light emitted by the light emitting chip 132 can be ensured to be reflected by the shielding portion 131 when entering the overlapping region above the light emitting chip 132, the intensity of the light emitted from the top of the light source 13 is reduced, and the light reflected by the shielding portion 131 can be reflected again when reaching the bottom of the light source 13 and finally emitted from the side surface of the light source 13, thereby avoiding the problems that the upper part of the light source 13 is slightly bright and the joint position of two adjacent light sources 13 is slightly dark.
Further, the shielding portion 131 is a central symmetric structure, and the light rays emitted from the light source 13 after being shielded by the shielding portion 131 are also symmetric, so that the light rays emitted from the display device are more uniform, and the display effect of the display device is improved.
The light emitting chip 132 is located on the circuit layer 122, and the light emitting chip 132 may be an LED chip, a mini LED chip, or an RGB chip. In the embodiment of the present invention, when the Light Emitting chip 132 is a micro Light Emitting Diode chip, the micro Light Emitting Diode chip includes, but is not limited to, a Mini-LED chip (Mini-Light Emitting Diode, abbreviated as Mini LED), which is different from a common Light Emitting Diode, and in the embodiment of the present invention, the Light Emitting chip 132 specifically refers to a micro Light Emitting Diode chip with a size of less than 500 μm. Since the light emitting chip 132 has a small size, the light emitting chip 132 is advantageous for controlling dynamic light emission to a smaller partition, which is advantageous for improving the contrast of a picture. In the embodiment of the present invention, the light emitting chips 132 are arranged in an array, which is beneficial to design the spacing between the light emitting chips according to the light emitting requirement of the backlight module.
The existence of the shielding portion 131 can appropriately reduce the light mixing distance, when the light mixing distance is applied to an ultra-thin display device, the light mixing distance needs to be further reduced, which is limited by the light emitting angle of the light emitting chip 132, and when the light mixing distance is further reduced, the problems that the upper part of the light source 13 is slightly bright and the joint position of two adjacent light sources 13 is slightly dark still exist.
In view of this, referring to fig. 4, the light source 13 provided in the embodiment of the present invention further includes two reflective layers 134, the two reflective layers 134 are respectively located on the light emitting side and the surface away from the light emitting side of the light emitting chip 132, the two reflective layers 134 have a property of reflecting light, when the light emitted from the light emitting chip 132 reaches the reflective layer on the light emitting side, part of the light is transmitted and most of the light is reflected, and when the reflected light reaches the reflective layer away from the light emitting side, the reflected light is reflected again, and this is repeated, finally, part of the light emitted from the light emitting chip 132 is transmitted by the reflective layer on the light emitting side, and part of the light is emitted from the side surface of the light emitting chip 132, so as to further increase the light emitting angle of the light emitting chip 132, reduce the brightness at the center of the light emitting chip 132, improve the light mixing effect of the two adjacent light sources 13, and avoid the obvious lamp shadow phenomenon due to the reduction of the light mixing distance, the display effect of the display device is improved. In addition, the existence of the reflective layer 134 can also avoid the black ring phenomenon that may occur after the shielding portion 131 is provided, thereby further improving the display effect of the display device.
Specifically, the two reflective layers 134 include: a first reflective layer 1341 and a second reflective layer 1342. The first reflective layer 1341 is disposed on a surface of the light emitting chip 132 close to the circuit layer 122, and the second reflective layer 1342 is disposed on a surface of the light emitting chip 132 away from the circuit layer 122. In the embodiment of the utility model, the reflectivity of the first reflective layer 1341 is greater than the reflectivity of the second reflective layer 1342, and the reflectivity of the first reflective layer 1341 is greater than or equal to 90%, so that most of the light incident on the first reflective layer 1341 is reflected, and the light incident on the second reflective layer 1342 is partially transmitted and reflected, thereby preventing the phenomenon of too dark brightness at the center of the light emitting chip 132.
In the embodiment of the present invention, the two reflective layers 134 are bragg reflective layers. The first reflective layer 1341 and the second reflective layer 1342 are formed by alternately stacking two first dielectric layers and two second dielectric layers with different refractive indexes, and the material of the first dielectric layer and the second dielectric layer may be determined according to different requirements of different display devices, as long as the reflectivity of the first reflective layer 1341 is greater than that of the second reflective layer 1342, and the reflectivity of the first reflective layer 1341 is greater than or equal to 90%, which is not limited herein.
The first reflective layer 1341 and the second reflective layer 1342 provided in the embodiments of the present invention may be provided with the number of layers of the first dielectric layer and the second dielectric layer according to different requirements of different display devices, which is not limited herein.
The sealing portion 133 is disposed around the light emitting chip 132, and is used for sealing and protecting the light emitting chip 132 and preventing foreign matters from entering the light source 13.
In the embodiment provided by the present invention, referring to fig. 4, the encapsulation part 133 may be an encapsulation bracket; specifically, the light emitting chip 132 is packaged in a POB packaging manner, and a package support is disposed outside the light emitting chip 132, and is used for packaging and protecting the light emitting chip 132 and preventing foreign matters from entering the light emitting chip 132. In the embodiment of the present invention, when the light emitting chip 132 is packaged in the POB packaging manner, the lower surface of the light emitting chip 132 forms a patch electrode at the same time, the patch electrode is electrically connected to the electrode of the light emitting chip 132, and after the light emitting chip is packaged, the packaged light emitting chip 132 is attached to the pad at the corresponding position of the circuit board. The POB packaging mode has mature process and good adaptability.
In some embodiments, as shown in fig. 4, the blocking portion 131 may be disposed on the package support. Therefore, the design can be simplified, and the shielding part is only required to be attached to the surface of the packaging support.
In another embodiment, as shown in fig. 5, a groove is disposed on the light emitting surface of the package support, and the groove is used for placing the blocking portion 131, and the blocking portion 131 is placed in the groove. The shielding part 131 is arranged by adopting the groove for more firm fixation, so that the surface of the light source is of a planar structure, and the service life of the display device is prolonged.
In the embodiment of the present invention, the shielding portion 131 may be a diffusion layer, and the diffusion plate is provided with scattering particle materials, so that light incident on the scattering particle materials can be refracted and reflected continuously, thereby achieving the effect of scattering light, and avoiding the problem of light above the light source 13; in addition, the light reflected back to the bottom of the light source 13 by the scattering particle material can be reflected again and finally emitted out from the side surface of the light source 13, which not only increases the intensity of the light emitted from the side surface of the light source 13, homogenizes the light intensity at each position in the light emitting range, but also increases the light emitting angle of the light source 13. Therefore, the problems of the light source 13 being over bright and the adjacent light source 13 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 13, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 13 used can be reduced without changing the light mixing distance, and the cost can be reduced.
In another embodiment of the present invention, the shielding portion 131 can also be a reflective layer, the reflective layer includes a matrix and reflective particles, the reflective particles have a reflective effect on the incident light, when the light enters the shielding portion 131, a part of the incident light will enter the reflective particles and be reflected by the reflective particles, so as to reduce the intensity of the light emitted from the top of the light source 13; and when the light reflected by the reflected particles reaches the bottom of the light source 13, the light can be reflected again and finally emitted out from the side surface of the light source 13, so that the intensity of the light emitted from the side surface of the light source 13 is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source 13 is increased. Therefore, the problems of the light source 13 being over bright and the adjacent light source 13 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 13, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 13 used can be reduced without changing the light mixing distance, and the cost can be reduced.
In specific implementation, the material of the shielding portion may be made of titanium dioxide or titanium dioxide, etc. which have reflection and/or scattering properties, and is not limited herein.
Fig. 6a is a fourth schematic cross-sectional view of a light source according to an embodiment of the utility model. Fig. 6b is a fifth schematic cross-sectional view of a light source according to an embodiment of the utility model. Fig. 6c is a sixth schematic cross-sectional view of a light source according to an embodiment of the utility model.
Referring to fig. 6a, in the embodiment provided in the present invention, the encapsulation portion 133 may also be an encapsulation glue; specifically, when the light emitting chip 132 is packaged by the COB packaging method, the light emitting chip 132 is first soldered to the pad corresponding to the circuit layer 122, and then the light emitting chip 132 is packaged by dispensing on the surface of the light emitting chip 132, where the packaging adhesive on the surface of the light emitting chip 132 may be a transparent colloid material, such as silica gel, modified silica gel, or epoxy resin with good permeability. COB packaging has higher efficiency and lower cost.
In the embodiment of the present invention, the shielding portion 131 is made of a material having a property of reflecting light, such as white ink, when light enters the shielding portion 131, a part of the incident light enters the white ink and is reflected by the white ink, so that the intensity of the light emitted from the top of the light source 13 is reduced; and when reaching the bottom of the light source 13, the light reflected by the white ink can be reflected again and finally emitted out from the side surface of the light source 13, so that the intensity of the light emitted from the side surface of the light source 13 is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source 13 is increased. Therefore, the problems of the light source 13 being over bright and the adjacent light source 13 being in dark at the connecting position can be avoided. On the premise of not changing the number of the light sources 13, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of light sources 13 used can be reduced without changing the light mixing distance, and the cost can be reduced.
Specifically, referring to fig. 6a, the white ink provided by the embodiment of the present invention is located inside the encapsulant 133, after the encapsulant is dispensed on the surface of the light emitting chip 132, and before the encapsulant is solidified, the white ink is dispensed on the surface of the encapsulant, and since both the encapsulant and the white ink have fluidity, the white ink will flow into the encapsulant, so as to form the shielding portion 131 shown in fig. 6 a. The shielding portion 131 is located inside the packaging adhesive, so that the shielding portion 131 can be fixed more firmly, and the service life of the display device is prolonged.
In another embodiment, before the sealing compound is solidified, a groove for containing white ink is formed on the sealing compound by pressing, and then the white ink is injected into the groove, and finally, since both the sealing compound and the white ink have fluidity, the white ink flows into the sealing compound, and the shielding portion 131 shown in fig. 6a is formed. Or pressing the packaging adhesive to form a groove for containing the white ink, injecting the white ink into the groove, and then dispensing the packaging adhesive on the upper side to seal the white ink in the packaging adhesive. The shielding portion 131 shown in fig. 6a may be formed to seal the white ink inside the sealing adhesive, and the specific operation method is not limited herein.
Referring to fig. 6b, in another embodiment of the present invention, the white ink is located on the surface of the encapsulant 133, and after the encapsulant is solidified, the white ink is applied to the top of the shielding portion 131 to form the shielding portion 131 as shown in fig. 6 a.
Referring to fig. 6c, in the embodiment of the utility model, after dispensing the glue on the surface of the light emitting chip 132, the top of the encapsulation glue is pressed properly, and after the encapsulation glue is solidified, white ink is dispensed on the top of the encapsulation glue, which is more reliable than the shielding portion 131 formed on the surface of the arc-shaped encapsulation glue shown in fig. 6b, thereby increasing the service life of the display device.
In the embodiment provided by the present invention, the parameters of the shielding portion 131 satisfy the condition of the light intensity distribution of the light source 13; wherein, the parameters of the shielding part 131 include: location, material, shape, concentration, thickness, and reflectivity. For example, as shown in fig. 7a, the thickness in the middle of the shielding portion 131 may be set larger than the thickness at both ends; alternatively, as shown in fig. 7b, the thickness of the white ink in the middle is increased (compared to fig. 6a), so that the intensity of the reflected light in the middle of the shielding part 131 can be increased, and when the light enters the middle of the shielding part 131, most of the light is reflected to reduce the intensity of the light emitted from the middle of the light source 13; the problems of the light sources 13 being brighter and the adjacent light sources 13 being darker at the connecting position can be further avoided.
When the backlight module is specifically implemented, the light-emitting light type of each light source can be simulated according to the final light-emitting effect of the backlight module, so that the setting area, the shape, the adopted material, the thickness and other parameters of the shielding part 131 are changed according to the simulation structure, and the light-emitting rate of each position is adjusted, so that the light-emitting light type of the final light source meets the condition of emitting uniform backlight. The specific shape of the blocking portion 131 is not limited in the embodiment of the present invention.
According to the first utility model concept, the shielding part is positioned at the light-emitting side of the light source, and the shielding part has a reflection effect on at least part of incident light, so that the emergent light intensity at the top of the light source can be weakened; and when the light reflected by the shielding part reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light source, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the second utility model discloses think about, there is the overlap area shielding part at the orthographic projection of backplate and luminescence chip at the orthographic projection of backplate, can guarantee the light of luminescence chip outgoing from this, when inciting into the overlap area of luminescence chip top, can be reflected by the shielding part, weaken the emergent light intensity at light source top, and when the bottom of light arrival light source by the light that shielding part reflects, can be reflected once more, finally the side outgoing at the light source, can avoid the light source top to shine partially and the problem that two adjacent light source handing-over positions are dark partially from this.
According to the third utility model discloses think about, the occlusion part is central symmetry structure, and the light of the light source outgoing after occlusion part shelters from is also symmetrical each other to make the light of display device outgoing more even, improved display device's display effect.
According to the fourth utility model, the light source comprises two reflecting layers, the two reflecting layers are respectively arranged on the light emitting side and the surface deviating from the light emitting side of the light emitting chip, the two reflecting layers have the property of reflecting light, when the light emitted by the light emitting chip reaches the reflecting layer on the light emitting side, part of the light is transmitted, most of the light is reflected, and the reflected light is reflected again when reaching the reflecting layer departing from the light-emitting side, repeating the above steps, part of light emitted from the light emitting chip is transmitted by the reflective layer at the light emitting side, and part of light is emitted from the side surface of the light emitting chip, thereby further increased the exit angle of emitting chip light, reduced the luminance of emitting chip central point department of putting, promoted the mixed light effect of two adjacent light sources, avoided because the obvious lamp shadow phenomenon that appears of mixed light distance's reduction, improved display device's display effect. In addition, the existence of the reflecting layer can also avoid the black ring phenomenon which can be caused after the shielding part is arranged, thereby further improving the display effect of the display device.
According to a fifth novel concept, the two reflective layers are bragg reflective layers. The reflecting layer is formed by alternately stacking two first medium layers and two second medium layers with different refractive indexes. The two reflective layers include: a first reflective layer and a second reflective layer. The first reflection layer is positioned on the surface of one side, close to the circuit layer, of the light-emitting chip, and the second reflection layer is positioned on the surface of one side, away from the circuit layer, of the light-emitting chip. The reflectivity of the first reflecting layer is greater than that of the second reflecting layer, and the reflectivity of the first reflecting layer is greater than or equal to 90%, so that the most of light incident to the first reflecting layer can be reflected, the light incident to the second reflecting layer is partially transmitted, most of light is reflected, and the phenomenon that the brightness of the center of the light-emitting chip is too dark can be prevented.
According to the concept of the sixth utility model, the packaging part can be a packaging bracket; specifically, adopt the POB packaging mode to encapsulate the luminescence chip, can set up the encapsulation support in the outside of luminescence chip, the encapsulation support is used for the encapsulation protection luminescence chip, and the separation foreign matter enters into inside the luminescence chip. The POB packaging mode has mature process and good adaptability.
According to the seventh utility model design, be provided with the recess on the play plain noodles of encapsulation support, this recess is used for placing the occlusion part, places the occlusion part in the recess. The groove is adopted to arrange the shielding part for fixation, so that the surface of the light source is of a planar structure, and the service life of the display device is prolonged.
According to the concept of the eighth utility model, the shielding part can be a diffusion layer, the diffusion plate is provided with scattering particle materials, and light rays incident on the scattering particle materials can be refracted and reflected continuously, so that the effect of scattering the light rays is achieved, and the problem that the upper part of the light source is slightly bright can be avoided; in addition, the light reflected to the bottom of the light source by the scattering particle material can be reflected again and finally emitted out from the side face of the light source, so that the intensity of the light emitted from the side face of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the ninth utility model, the shielding part can also be a reflecting layer, the reflecting layer comprises a substrate and reflecting particles, the reflecting particles have a reflecting effect on incident light, when the light is incident to the shielding part, part of the incident light can be incident to the reflecting particles and reflected by the reflecting particles, so that the emergent light intensity at the top of the light source is weakened; and when the light reflected by the reflected particles reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the concept of the tenth utility model, the packaging part is packaging glue; specifically, the light emitting chip is packaged in a COB packaging mode, the light emitting chip is welded to the bonding pad corresponding to the circuit layer, and then the light emitting chip is packaged on the surface of the light emitting chip in a dispensing mode, so that the COB packaging has high efficiency and low cost.
According to the eleventh utility model, the shielding portion is made of a material having a property of reflecting light, such as white ink, and when light is incident to the shielding portion, part of the incident light is incident to the white ink and reflected by the white ink, so that the intensity of emergent light from the top of the light source is reduced; and when the light reflected by the white ink reaches the bottom of the light source, the light can be reflected again and finally emitted out from the side surface of the light, so that the intensity of the light emitted from the side surface of the light source is increased, the light intensity at each position in the light emitting range is homogenized, and the light emitting angle of the light source is increased. Therefore, the problems that the upper part of the light source is slightly bright and the joint position of two adjacent light sources is slightly dark can be avoided. On the premise of not changing the number of light sources, the light mixing distance can be properly reduced, so that the development requirement of thinning the display device can be met on the premise of not increasing the manufacturing cost; in addition, the number of the light sources used can be reduced and the cost can be reduced on the premise of not changing the light mixing distance.
According to the twelfth utility model, white printing ink is located the inside of encapsulation glue, and after the encapsulation of luminous chip surface point was glued, before the encapsulation glue solidifies, to the surface point white printing ink of encapsulation glue, because encapsulation glue and white printing ink all have mobility, white printing ink can flow to the inside of encapsulation glue, forms the occlusion part. The shielding part is positioned inside the packaging adhesive, so that the shielding part can be fixed more firmly, and the service life of the display device is prolonged.
According to the idea of the thirteenth utility model, the white ink is located on the surface of the packaging adhesive, and after the packaging adhesive is solidified, the white ink is applied to the top of the shielding part to form the shielding part.
According to the concept of the fourteenth utility model, the parameters of the shielding part satisfy the conditions of the light intensity distribution of the light emitted from the light source; wherein, the parameters of the shielding part comprise: location, material, shape, concentration, thickness, and reflectivity. For example, the thickness of the middle of the shielding part can be set to be larger than the thicknesses of the two ends, so that the intensity of reflected light in the middle area of the shielding part can be increased, and when light enters the middle area of the shielding part, most of the light is reflected, so that the emergent light intensity in the middle area of the light source is weakened; the problems of over-brightness of the light sources and dark of the joint position of two adjacent light sources can be further avoided.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
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| CN202122019685.2U CN215416207U (en) | 2021-08-25 | 2021-08-25 | Display device |
| PCT/CN2022/095745 WO2022247941A1 (en) | 2021-05-28 | 2022-05-27 | Display device |
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| CN202122019685.2U CN215416207U (en) | 2021-08-25 | 2021-08-25 | Display device |
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| CN115079469A (en) * | 2022-07-21 | 2022-09-20 | 华引芯（武汉）科技有限公司 | Light source, light source module and display device |
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