Patent ID: 12261243

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present disclosure. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the disclosure, and are not used to limit the disclosure. In the present disclosure, in the case of no explanation to the contrary, the orientation words used such as “on” and “under” usually refer to upper and lower directions of the device in actual use or working state, specifically the directions in the drawings, and “inside” and “outside” refer to the outline of the device.

The embodiments of the present disclosure provide a light-emitting diode, a light-emitting substrate, and a display device. They will be described in detail in the following. It should be noted that an order of description in the following embodiments is not meant to limit a preferred order of the embodiments.

The present disclosure provides the light-emitting diode. The light-emitting diode includes a first semiconductor layer, a light-emitting layer, a second semiconductor layer, and a first protective layer. The light-emitting layer is disposed on the first semiconductor layer. The second semiconductor layer is disposed on one side of the light-emitting layer away from the first semiconductor layer and is located on a light-emitting surface of the light-emitting layer. The first protective layer is disposed on one side of the second semiconductor layer away from the light-emitting layer. wherein, the light-emitting diode includes at least one convergence surface, and the at least one convergence surface includes a surface of the second semiconductor layer away from the light-emitting layer and/or a surface of the first protective layer away from the second semiconductor layer.

Therefore, the light-emitting diode of the present disclosure is provided with the at least one convergence surface, and the at least one convergence surface includes the surface of the second semiconductor layer away from the light-emitting layer and/or the surface of the first protective layer away from the second semiconductor layer. When light emitted from the light-emitting layer is incident on the at least one convergence surface, using the convergence effect of the at least one convergence surface on the light, an angle of emergence of light emitted from the at least one convergence surface will be reduced, thereby improving the collimation effect of the light-emitting diode. When the light-emitting diode is applied to total reflective LCD display products, display uniformity of the total reflective LCD display products can be improved.

The light-emitting diode of the present disclosure will be described in detail below in conjunction with specific embodiments.

Referring toFIG.1, the embodiment of the present disclosure provides a light-emitting diode10. The light-emitting diode10includes a base substrate1, a buffer layer2, a first semiconductor layer3, a light-emitting layer4, a second semiconductor layer5, a first protective layer6, a second protective layer7, a first electrode8, and a second electrode9.

Specifically, the base substrate1may be a sapphire base substrate, a gallium arsenide base substrate, or a silicon base substrate. In this embodiment, the base substrate1is the sapphire base substrate.

The buffer layer2is disposed on one side of the base substrate1. A material of the buffer layer2may include gallium nitride.

The first semiconductor layer3is disposed on one side of the buffer layer2away from the base substrate1. In this embodiment, the first semiconductor layer3is an N-type semiconductor layer, and a material of the N-type semiconductor layer includes N-type gallium nitride.

The light-emitting layer4is disposed on one side of the first semiconductor layer3away from the buffer layer2. light-emitting layer4has a light-emitting surface. Wherein, the light-emitting layer4is a multiple-quantum-well structure, and the multiple-quantum-well structure may include a stacked structure of a gallium nitride layer and an indium gallium nitride layer.

The second semiconductor layer5is disposed on one side of the light-emitting layer4away from the first semiconductor layer3. The second semiconductor layer5is located on the light-emitting surface of the light-emitting layer4. In this embodiment, the second semiconductor layer5is a P-type semiconductor layer, and a material of the P-type semiconductor layer includes P-type gallium nitride.

The first protective layer6is disposed on one side of the second semiconductor layer5away from the light-emitting layer4. A refractive index of the first protective layer6is less than a refractive index of the second semiconductor layer5and greater than a refractive index of the air. Wherein, a material of the first protective layer6may include one or more of silicon oxide, silicon nitride, or silicon oxynitride.

In this embodiment, the light-emitting diode10includes at least one convergence surface. It can be understood that the convergence surface is used to converge light, converging light refers to reducing an angle of emergence of light incident on the convergence surface to converge the light. Wherein, the at least one convergence surface protrudes outward along a direction from the first semiconductor layer3toward the light-emitting layer4.

By the above setting, when the light emitted from the light-emitting surface of the light-emitting layer4enters the convergence surface, incident light on the convergence surface will be refracted on the convergence surface, and the angle of emergence of refracted light on the convergence surface will decrease, so that the refracted light will converge toward a center of the light-emitting diode10, thereby improving the collimation effect of the light-emitting diode10.

Specifically, the at least one convergence surface includes a first convergence surface51and a second convergence surface61. The surface of the second semiconductor layer5away from the light-emitting layer4is the first convergence surface51. The second semiconductor layer5has a first bottom surface52. The first bottom surface52is in contact with the light-emitting surface of the light-emitting layer4and is directly connected to the first convergence surface51. The first convergence surface51protrudes outward along a direction from the first semiconductor layer3toward the light-emitting layer4. The surface of the first protective layer6away from the second semiconductor layer5is a second convergence surface61. The second convergence surface61protrudes outward along a direction from the light-emitting layer4toward the second semiconductor layer5. The first protective layer6has a second bottom surface62, and the second bottom surface62is in contact with the first convergence surface51and is directly connected to the second convergence surface61.

By the above setting, when the light emitted from the light-emitting surface of the light-emitting layer4enters the first convergence surface51, the incident light on the first convergence surface51will be refracted on the first convergence surface51, and the angle of emergence of refracted light on the first convergence surface51will decrease, so that the refracted light will converge toward a center of the first protective layer6, thereby improving the collimation effect of the light-emitting diode10. Further, when the refracted light emitted from the first convergence surface51enters the second convergence surface61, incident light on the second convergence surface61will be refracted on the second convergence surface61, and an angle of emergence of refracted light on the second convergence surface61will decrease, so that the refracted light will converge toward the center of the light-emitting diode10and act as emission light to be emitted, thereby further improving the collimation effect of the light-emitting diode10.

It should be noted that in some embodiments, the light-emitting diode10may also include only one of the first convergence surface51or the second convergence surface61. At this time, the convergence surface is the surface of the second semiconductor layer5away from the light-emitting layer4or the surface of the first protective layer6away from the second semiconductor layer5, and is not repeated herein.

Further, in this embodiment, an orthographic projection of the first protective layer6on a plane where the first semiconductor layer3is located is within an orthographic projection of the second semiconductor layer5on the plane where the first semiconductor layer3is located, and in a direction from the first semiconductor layer3to the light-emitting layer4, a horizontal cross-sectional area of the second semiconductor layer5decreases. A surface of the first protective layer6adjacent to the light-emitting layer4matches a surface of the second semiconductor layer5away from the light-emitting layer4, and this setting can further improve the collimation effect of the light-emitting diode10.

It should be noted that in this embodiment, structures of the second semiconductor layer5and the first protective layer6are only for illustration, and are used to facilitate the description of the embodiments, but should not be construed as a limitation on the present disclosure. In some embodiments, the second semiconductor layer5further has a first connecting surface (not shown in the figure) connecting the first convergence surface51and the first bottom surface52, and the first connecting surface may protrude outward in a direction away from the first convergence surface51. The first protective layer6has a second connecting surface (not shown in the figure) connecting the second convergence surface61and the second bottom surface62, and the second connecting surface may protrude outward in a direction away from the second convergence surface61, which will not be repeated here.

The second protective layer7is disposed on one side of the first semiconductor layer3away from the buffer layer2and is adjacent to the light-emitting layer4. A thickness of the second protective layer7is less than a thickness of the light-emitting layer4. Specifically, the second protective layer7is on a same layer as the light-emitting layer4, and one side surface of the second protective layer7is in contact with one side surface of the light-emitting layer4. Wherein, the second protective layer7may be manufactured by a same process as the first protective layer6, and a material of the second protective layer7may include one or more of silicon oxide, silicon nitride, or silicon oxynitride.

The first electrode8is disposed on one side of the first protective layer6away from the second semiconductor layer5, that is, the first electrode8is disposed on the second convergence surface61. The second electrode9is disposed on one side of the second protective layer7away from the first semiconductor layer3. In this embodiment, the first electrode8is a P-type electrode, and the second electrode9is an N-type electrode.

The present disclosure further provides the light-emitting substrate. The light-emitting substrate may be used as a backlight product to provide a light source required for LCDs, or the light-emitting substrate may also be directly used in direct view display products. This embodiment only takes a structure of the light-emitting substrate as a backlight product as an example for description, but is not limited thereto.

Specifically, referring toFIG.2, the light-emitting substrate100includes a substrate20, a light board30, and a light-emitting diode10. The light board30is disposed on the substrate20and is located on at least one side edge of the substrate20. The light-emitting diode10is disposed on an inner surface of the light board30.

In this embodiment, the substrate20is provided with two light boards30. The two light boards30are disposed opposite to each other at the edges of the substrate20and are located on a long-side direction of the substrate20, thereby improving light-emitting uniformity of the light-emitting substrate100. Wherein, light-emitting diodes10disposed on one light board30is arranged corresponding to light-emitting diodes10disposed on the other light board30by one-to-one.

The light-emitting diodes10may be the light-emitting diode10described in the foregoing example, and a specific structure of the light-emitting diodes10may refer to the description of the foregoing example, which will not be repeated here.

It should be noted that in some embodiments, the two light boards30on the substrate20may also be disposed in a short-side direction of the substrate20, or in some embodiments, the substrate20may also be provided with one light board30, three light boards30, or four light boards30. A location and a number of the light boards30on the substrate20are not specifically limited in the present disclosure.

In the light-emitting substrate100provided in the present disclosure, the collimation effect of the light-emitting substrate100can be improved by using the light-emitting diode10described in the foregoing example, which has high collimation, thereby improving a light-emitting brightness of the light-emitting substrate100and the light-emitting uniformity of the light-emitting substrate100at a same time.

Referring toFIG.3, a first embodiment of the present disclosure provides a display device1000. The display device1000includes a framework200, a total reflective liquid crystal display panel300, a light-emitting substrate100, and a coverplate400. The framework200includes a bottom plate201and a side wall202disposed on the bottom plate201. The total reflective liquid crystal display panel300is disposed on the bottom plate201. The light-emitting substrate100is disposed on an inner surface of the side wall202. One side of the light-emitting substrate100provided with the light-emitting diode10faces the total reflective liquid crystal display panel300. The coverplate400is attached to an upper surface of the side wall202.

It should be noted that for facilitating the description of the present disclosure, the display device1000in the following embodiments of the present disclosure only shows the structures of the light board30and the light-emitting diode10of the light-emitting substrate100, but it should not be construed as a limitation on the present disclosure. In addition, a structure of the light-emitting substrate100here is same as the structure of the light-emitting substrate100described in the foregoing embodiment, and a specific structure of the light-emitting substrate100may refer to the description of the foregoing embodiment, which will not be repeated here.

In the display device1000provided in this embodiment, an additional light source is provided to the total reflective liquid crystal display panel300by disposing the light-emitting substrate100on the side wall202of the framework200, thereby improving the brightness of the display device1000, and preventing brightness of the display screen from being reduced due to lower brightness of ambient light. In addition, since the light-emitting substrate100has a good collimation effect, the brightness uniformity of the display device1000may also be improved.

Referring toFIGS.4and5, a second embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the second embodiment of the present disclosure and that in the first embodiment is that in a long-side direction X of the display device1000, the side wall202has a first inner surface2021and a second inner surface2022defined opposite to each other, and the first inner surface2021and the second inner surface2022are both provided with the light-emitting substrate100.

In this embodiment, by disposing two light-emitting substrates100in the long-side direction X of the display device1000, the brightness uniformity of the display device1000can be further improved while improving the brightness of the display device1000.

Referring toFIGS.6and7, a third embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the third embodiment of the present disclosure and that in the first embodiment is that the light-emitting substrate100further includes a first light-blocking part40, which is disposed on one side of the light-emitting diode10facing the total reflective liquid crystal display panel300and covers peripheries of the light-emitting diode10.

In this embodiment, the light-emitting diode10emits light from one side, that is, an upper surface of the light-emitting diode10is the light-emitting surface. In this embodiment, by disposing the first light-blocking part40around the light-emitting diode10, the light-blocking effect of the first light-blocking part40is used to make the peripheries of the light-emitting diode10be unable to transmit light, which prevents light from emitting from edges of the light-emitting diode10, thereby decreasing a light-emitting angle and further improving the collimation effect of the light-emitting substrate100. Therefore, it is beneficial to further improve the brightness uniformity of the display device1000.

In this embodiment, the first light-blocking part40may be formed by dispensing process. Specifically, the first light-blocking part40is an opaque white glue, and a material of the white glue may be silica gel doped with titanium dioxide. In some embodiments, the material of the first light-blocking part40may also be a black light-shielding material. For example, a black pigment may be doped into the silica gel to realize a light-shielding effect. The material of the first light-blocking part40is not limited in the present disclosure.

Referring toFIGS.8and9, a fourth embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the fourth embodiment of the present disclosure and that in the third embodiment is that the light-emitting substrate100further includes a second light-blocking part50covering a side surface of the light-emitting diode10.

In this embodiment, the light-emitting diode10emits light from five sides, that is, the upper surface and four side surfaces of the light-emitting diode10are all light-emitting surfaces. In this embodiment, by disposing the second light-blocking part50on side surfaces of the light-emitting diode10, the light-blocking effect of the second light-blocking part50is used to make the side surfaces of the light-emitting diode10be unable to transmit light, which prevents light from emitting from the side surfaces of the light-emitting diode10, thereby further improving the collimation effect of the light-emitting substrate100. Therefore, it is beneficial to further improve the brightness uniformity of the display device1000.

In this embodiment, a material of the second light-blocking part50may be same as that of the first light-blocking part40, which may be the silica gel doped with titanium dioxide. In some embodiments, the material of the second light-blocking part50may also be different from that of the first light-blocking part40, and at this time, the material of the second light-blocking part50may be the silica gel doped with black pigments. Under this setting, the light-blocking effect of the second light-blocking part50is better than that of the first light-blocking part40.

Referring toFIG.10, a fifth embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the fifth embodiment of the present disclosure and that in the first embodiment is that the light-emitting substrate100further includes a reflective component60disposed on the substrate20, one side of the reflective component60away from the substrate20is provided with a groove601, a surface of the groove601is a reflective curved surface601a, and the light-emitting diode10is accommodated in the groove601.

In this embodiment, the light-emitting substrate100is provided with the reflective component60, and the light-emitting diode10is accommodated in the groove601of the reflective component60. Since the surface of the groove601is the reflective curved surface601a, when light at a large angle emitted from the light-emitting diode10is incident on the surface of the groove601, the incident light incident on the reflective curved surface601awill be reflected and re-emitted to the light-emitting diode10, thereby realizing a light collimation effect. Therefore, the loss of light emitted from the edges of the light-emitting diode10at the large angle is reduced, so that the light at the edges of the light-emitting diode10and in a central area of the light-emitting diode10is homogenized, thereby further improving the collimation effect of the light-emitting substrate100and the brightness uniformity of the display device1000.

In this embodiment, the reflective component60is a reflective cover, and the reflective cover may cover the light-emitting diode10. When a material of the reflective component60is a reflective material such as silver, the reflective surface is provided by the reflective cover itself. When the material of the reflective component60is a non-reflective material, the reflective surface may be obtained by attaching or coating a reflective layer. As long as it can ensure that the surface of the groove601is a curved surface having the reflective effect, it is within the protection scope of the present disclosure.

Referring toFIG.11, a sixth embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the sixth embodiment of the present disclosure and that in the first embodiment is that the coverplate400and the framework200together form a closed chamber500, the closed chamber500is provided with an air bag501, a gas for refraction is filled in the air bag501, and a refractive index of the gas for refraction is greater than the refractive index of the air.

In current technology, the medium between the total reflective liquid crystal display panel300and the light-emitting substrate100is the air, and the refractive index of the air is 1.000292. After the light emitted from the light-emitting substrate100is refracted by the air, an angle between the refracted light and the normal line is large, and the light entering the total reflective liquid crystal display panel300is more divergent, making the uniformity between the light at the edges of the panel and the central area of the panel is poorer.

Therefore, in this embodiment, by replacing the air in the closed chamber500with the gas for refraction which has the refractive index greater than the air, after the light emitted from the light-emitting substrate100is refracted by the gas for refraction in the air bag501, the angle between the refracted light and the normal line becomes smaller, thereby improving the collimation effect of the incident light on the total reflective liquid crystal display panel300. Therefore, the light at the edges and the central area of the total reflective liquid crystal display panel300can be homogenized, thereby improving the brightness uniformity of the display device1000.

In this embodiment, the gas for refraction is stored in the air bag501, so the airtightness of the gas for refraction can be greatly improved. The gas for refraction may be a non-toxic and harmless gas such as nitrogen, and a type of the gas for refraction is not specifically limited in this embodiment.

Further, at least one of the coverplate400or the framework200is provided with an inflatable port600connected to the air bag501. In this embodiment, the inflatable port600is disposed on the side wall202of the framework200. The inflatable port600is provided with an inflatable sealing device600a. The inflatable sealing device600aincludes a valve (not shown in the figure), when the valve is opened, the air bag501is filled with the gas for refraction by an inflatable pump (not shown in the figure).

Referring toFIGS.12and13, a seventh embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the seventh embodiment of the present disclosure and that in the sixth embodiment is that the bottom plate has a first section201aand a second section201badjacent to the first section201a, the total reflective liquid crystal display panel300is disposed on the first section201a, and the inflatable port600is disposed on the second section201b.

In this embodiment, disposing the inflatable port600on the second section201bof the bottom plate201can improve the aesthetics of the display device1000. It should be noted that the second section201bis a part of the bottom plate201where the total reflective liquid crystal display panel300is not disposed. The position of the second section201bin this embodiment is only for illustration and is used to describe this embodiment conveniently, but should not be construed as a limitation of the present disclosure.

Referring toFIG.14, an eighth embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the eighth embodiment of the present disclosure and that in the second embodiment is that the first inner surface2021and the second inner surface2022are both arc-shaped reflective concave surfaces.

In this embodiment, the inner surfaces of the side wall202provided with the light-emitting substrate100are designed as the arc-shaped reflective concave surfaces. When light at a large angle emitted from light-emitting substrates100is incident on the reflective concave surfaces, the incident light will be reflected by the first inner surface2021and the second inner surface2022and re-emitted to corresponding light-emitting substrates100, thereby realizing the light collimation effect. Therefore, the loss of light emitted from the edges of the light-emitting substrate100at the large angle is reduced, so that the light at the edges and in the central area of the light-emitting substrate100is homogenized, thereby further improving the collimation effect of the light-emitting substrate100and the brightness uniformity of the display device1000.

Referring toFIG.15, a ninth embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the ninth embodiment of the present disclosure and that in the eighth embodiment is that an outer surface of the side wall202is also an arc-shaped reflective concave surface.

Specifically, a first outer surface2023corresponding to the first inner surface2021and a second outer surface2024corresponding to the second inner surface2022on the side wall202are both arc-shaped reflective concave surfaces.

In this embodiment, the outer surfaces of the side wall202provided with the light-emitting substrates100are designed as the arc-shaped reflective concave surfaces. At this time, the side wall202is an arc structure. When a part of the light at the large angle emitted from the inner surfaces of the side wall202are incident on the first outer surface2023and the second outer surface2024of the side wall202, a part of the incident light will be reflected and re-emitted toward the light-emitting substrate100, thereby improving utilization of light.

Referring toFIG.16, a tenth embodiment of the present disclosure provides the display device1000. A difference between the display device1000provided in the tenth embodiment of the present disclosure and that in the ninth embodiment is that the display device1000further includes a reflective layer700, and the reflective layer700is disposed on the reflective concave surfaces.

Specifically, the first inner surface2021and the second inner surface2022are provided with the reflective layer700, respectively. Wherein, the reflective layer700may be a reflective sheet or a white oil layer. When the light at the large angle emitted from light-emitting substrates100is incident on the reflective layer700, the incident light will be reflected by the reflective layer700and re-emitted to the light-emitting substrates100, thereby realizing the light collimation effect. Therefore, the loss of light emitted from the edges of the light-emitting substrate100at the large angle can be reduced, thereby further improving the collimation effect of the light-emitting substrate100. Therefore, the brightness uniformity of the display device1000can be further improved.

The light-emitting diode, the light-emitting substrate, and the display device provided in the embodiments of the present disclosure are described in detail above. Specific examples are used herein to explain the principles and implementation of the present disclosure. The descriptions of the above embodiments are only used to help understand the method of the present disclosure and its core ideas; meanwhile, for those skilled in the art, the range of specific implementation and application may be changed according to the ideas of the present disclosure. In summary, the content of the specification should not be construed as causing limitations to the present disclosure.