DRIVE BACKPLANE AND METHOD FOR PREPARING SAME, LIGHT-EMITTING SUBSTRATE AND METHOD FOR PREPARING SAME

A drive backplane and a method for preparing same, a light-emitting substrate and a method for preparing same. The drive backplane includes a driving substrate, a reflective layer, and a number of barriers, wherein the driving substrate includes a base substrate and connecting components disposed on the base substrate, and the connecting components are used to connect to light-emitting devices. The drive backplane can avoid a phenomenon that the reflective layer covers the connecting components, and the reflective layer covers a larger area on the drive backplane and reflectivity is relatively high.

FIELD OF DISCLOSURE

The present application relates to a field of display technology, and in particular, to a drive backplane and a method for preparing same, a light-emitting substrate and a method for preparing same.

BACKGROUND

Mini light-emitting diode (mini LED), also known as sub-millimeter light-emitting diode, is a new type of display technology that enables a size of light-emitting diode (LED) to be between 100 m and 200 μm. Among mini LEDs, each LED may be individually addressed and driven to emit light, so it has advantages of high efficiency, high brightness, high reliability, fast response time, and large screen, etc. Meanwhile, mini LED display products also have the advantages of thinness and low power consumption, thus are increasingly favored by consumers.

SUMMARY

Technical Problem

Positive electrodes and negative electrodes of mini LEDs are typically coupled to pads on a drive backplane, so as to realize lighting of the mini LEDs via the drive backplane. In a preparing process of the drive backplane, white oil for reflecting light given off by the mini LEDs is coated on peripheral regions of the pads on the drive backplane, so as to improve light utilization and light-emitting uniformity of the mini LEDs. But due to good fluidity of the white oil, it is easy to cover the pads during a flow process, which affects conduction and soldering reliability of the mini LEDs. In order to solve the above-mentioned problem, an opening area of the white oil is usually increased, that is, when printing the white oil, printing site of the white oil is away from the pads, but in such a case, it results in lower coverage area of the white oil on the drive backplane and lower reflectivity, which further causes lower light utilization and poorer light-emitting uniformity of the mini LEDs.

Technical Solution

The embodiments of the present application provide a drive backplane and a method for preparing same, a light-emitting substrate and a method for preparing same, which may avoid a phenomenon that a reflective layer covers connecting components, and the reflective layer covers a large area on the drive backplane and the reflectivity is relatively high. In a case that light-emitting devices are disposed on the connecting components of the drive backplane to form a light-emitting substrate, a light utilization of the light-emitting device as well as a light-emitting uniformity of the light-emitting substrate will be improved.

In a first aspect, an embodiment of the present application provides a drive backplane, including:a driving substrate, including a base substrate and connecting components disposed on the base substrate, and the connecting components are used to connect to light-emitting devices;a reflective layer, disposed on one side of the base substrate where the connecting components are disposed, and the reflective layer is disposed on a periphery of the connecting components;a number of barriers, disposed on the one side of the base substrate where the connecting components are disposed, and the barriers are disposed around the connecting components and the barriers are embedded in the reflective layer.

In some embodiments, a number of openings are defined on the reflective layer, groups of the connecting components are disposed on the base substrate, and each opening is provided with a group of the connecting components; a sum of areas of the number of openings is a, an area of the reflective layer is b, and an aperture ratio a/(a+b) is 0.2%-30%.

In some embodiments, a cross-section of the barriers is circular, and a diameter of the cross-section of the barriers is 1 μm-150 μm, and a height of the barriers is 30 μm-150 μm.

In some embodiments, a height of the barriers is greater than or equal to a thickness of the reflective layer;a top surface of a region between adjacent barriers on the reflective layer shows an arc surface recessed facing the base substrate.

In some embodiments, the connecting components include a number of connecting pieces, and a distance between a connecting piece and an adjacent barrier is 50 μm-200 μm;a distance between adjacent barriers is 30 μm-200 μm.

In some embodiments, a material of the barriers includes a photoresist material.

In some embodiments, at least one ring of the barriers is disposed on a periphery of each group of the connecting components, and the barriers of a same ring are located on sides of a central symmetric figure.

In a second aspect, an embodiment of the present application provides a method for preparing a drive backplane, including:providing a driving substrate, the driving substrate includes a base substrate and connecting components disposed on the base substrate, and the connecting components are used to connect to light-emitting devices;disposing a number of barriers corresponding to a periphery of the connecting components on the base substrate, so that a number of barriers are disposed around the connecting components;disposing an ink material corresponding to the periphery of the connecting components on the base substrate, the ink material is connected with the number of barriers, and a reflective layer is formed after the ink material is cured, so that the barriers are embedded in the reflective layer.

In some embodiments, the step of disposing the number of barriers corresponding to the periphery of the connecting components on the base substrate includes:disposing a photoresist material on the base substrate to form a photoresist layer;patterning the photoresist layer by means of exposure and development to form the number of barriers located on the periphery of the connecting components.

In some embodiments, the ink material corresponding to the periphery of the connecting components is disposed on the base substrate by screen printing or inkjet printing.

In a third aspect, an embodiment of the present application provides a light-emitting substrate, including:a drive backplane, the drive backplane is the above-mentioned drive backplane, or is a drive backplane obtained by the above-mentioned method for preparing the drive backplane;light-emitting devices, the light-emitting devices are electrically connected to the connecting components of the drive backplane.

In a fourth aspect, an embodiment of the present application provides a method for preparing a light-emitting substrate, including:providing the above-mentioned drive backplane, or preparing the drive backplane according to the above-mentioned method for preparing the drive backplane;providing light-emitting devices, so that the light-emitting devices are electrically connected to the connecting components of the drive backplane to obtain the light-emitting substrate.

ADVANTAGES OF THE PRESENT APPLICATION

There is provided with a drive backplane in the embodiments of the present application. By disposing a number of barriers in the reflective layer, the reflective layer can be implemented as follows: first, the number of barriers are disposed on the base substrate, and then the ink material is disposed on the base substrate to form the reflective layer, and under the blocking effect of the barriers, the fluidity of the ink material decreases, and due to a surface tension between an outer surface of the barriers and the ink material, the ink material is attracted by the outer surface of the barriers, thereby reducing the fluidity of the ink material. In addition, when the fluidity of the ink material decreases, the ink material does not easily flow to a position of the connecting components, thereby avoiding a problem of the connecting components being covered by the ink material, which can improve soldering yield. In addition, when the fluidity of the ink material decreases, the ink material can be disposed at a position close to the connecting components when the ink material is applied, so as to reduce an area of the opening surrounded by the inner edge of the reflective layer and to increase a coverage area of the ink material (namely, the reflective layer) on the drive backplane, and when the light-emitting devices are disposed on the connecting components of the drive backplane to form a light-emitting substrate, the drive backplane has a high reflectivity for the lights given off by the light-emitting devices, which not only can improve the light utilization of the light-emitting devices, but also avoid a formation of dark regions between adjacent light-emitting devices, thereby improving the light-emitting uniformity of the light-emitting substrate.

DETAILED DESCRIPTION

Technical solutions in the implementations of the present application will be described clearly and completely hereinafter with reference to the accompanying drawings in the implementations of the present application. Apparently, the described implementations are merely some rather than all implementations of the present application. All other implementations obtained by those of ordinary skill in the art based on the implementations of the present application without creative efforts shall fall within the protection scope of the present application.

Please refer toFIGS.1to3.FIG.1is a first schematic top view of a drive backplane provided by an embodiment of the present application,FIG.2is an enlarged schematic view of a region C in the drive backplane ofFIG.1, andFIG.3is a schematic cross-sectional view of the drive backplane ofFIG.2along an A-A direction. An embodiment of the present application provides a drive backplane110, including a driving substrate50, a reflective layer40, and a number of barriers30. In the embodiments of the present application, “a number of” refers to one or more, and “a plurality of” refers to two or more, such as three, four, five, six, seven, eight, and so on.

Wherein the driving substrate50includes a base substrate10and connecting components20disposed on the base substrate10, and the connecting components20are used to connect to light-emitting devices120.

The reflective layer40is disposed on one side of the base substrate10where the connecting components20are disposed, and the reflective layer40is disposed on a periphery of the connecting components20.

The number of barriers30are disposed on the one side of the base substrate10where the connecting members20are disposed, and the number of barriers30are disposed around the connecting members20, and the number of barriers30are embedded in the reflective layer40.

It should be noted that the drive backplane110is provided in the embodiments of the present application. By disposing the number of barriers30in the reflective layer40, the reflective layer40can be implemented as follows: first, the number of barriers30are disposed on the base substrate10, and then an ink material is disposed on the base substrate10to form the reflective layer40, and under a blocking effect of the barriers30, a fluidity of the ink material decreases, and due to surface tension between an outer surface of the barriers30and the ink material, the ink material is attracted by the outer surface of the barriers30, thereby reducing the fluidity of the ink material. In addition, when the fluidity of the ink material decreases, the ink material does not easily flow to a position of the connecting components20, thereby avoiding a problem of the connecting components20being covered by the ink material, which can improve soldering yield. In addition, when the fluidity of the ink material decreases, the ink material can be disposed at a position close to the connecting components20when the ink material is applied, so as to reduce an area of the opening surrounded by an inner edge of the reflective layer40and to increase a coverage area of the ink material (namely, the reflective layer40) on the drive backplane110, and when the light-emitting devices120are disposed on the connecting components20of the drive backplane110to form a light-emitting substrate100, the drive backplane110has a high reflectivity for light given off by the light-emitting devices120, which not only can improve light utilization of the light-emitting devices120, but also avoid a formation of dark regions between adjacent light-emitting devices120, thereby improving a light-emitting uniformity of the light-emitting substrate100.

Referring toFIG.1, a number of openings41are defined on the reflective layer40, groups of the connecting components20are disposed on the base substrate10. Each opening41is provided with a group of the connecting components20, and a sum of areas of openings41is a, and an area of the reflective layer40is b, and an aperture ratio a/(a+b) is 0.2%-30%, such as 0.2%, 0.4%, 0.6%, 0.8%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 13%, 15%, 17%, 20%, 22%, 25%, 28%, 30%, etc. It can be seen that the reflective layer40has a relatively small aperture ratio. In a case that the aperture ratio of the reflective layer40is relatively small, the coverage area of the reflective layer40on the drive backplane110is relatively large, so that reflectivity of the reflective layer40to the light-emitting devices120can be increased.

Exemplarily, a cross-section of the barriers30is circular, and a diameter of the cross-section of the barriers30is 1 μm-150 μm, such as 1 μm, 3 μm, 5 μm, 7 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 27 μm, 30 μm, 50 μm, 70 μm, 100 μm, 130 μm, 150 μm, etc. It should be noted that the cross-section of the barriers30refers to a cross-section obtained by cutting the barriers30in a direction parallel to the base substrate10in the embodiment of the present application. It should be understood that the cross-section of the barriers30can also be in other shapes, such as triangular, rectangular (rectangular or square), regular pentagonal, regular hexagonal, star, and irregular shape and the like.

Referring toFIG.1, the barriers30may be in the shape of a truncated cone, that is, a cross-sectional area of the barriers30gradually increases from one side away from the base substrate10to one side close to the base substrate10. Certainly, a shape of the barriers30can also be set such that the cross-sectional area of the barriers30gradually decreases or remains uniform, from one side away from the base substrate10to one side close to the base substrate10.

Exemplarily, a height of the barriers30may be 30 μm-150 μm, such as 30 μm, 40 am, 50 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, and the like. It should be understood that the height of the barriers30refers to a distance between a side surface of the barriers30away from the base substrate10and a side surface of the barriers30connected to the base substrate10.

Exemplarily, a thickness of the reflective layer40may be 30 μm-150 μm, such as 30 μm, 40 μm, 50 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, and the like. It should be understood that the thickness of the reflective layer40refers to a distance between a side surface of the reflective layer40away from the base substrate10and a side surface of the reflective layer40connected to the base substrate10.

Please refer toFIG.1, the height of the barriers30may be greater than or equal to the thickness of the reflective layer40.

It should be noted that when the height of the barriers30is greater than or equal to the thickness of the reflective layer40, due to an effect of surface tension, a top surface of a region between adjacent barriers30on the reflective layer40(that is, the side surface of the reflective layer40away from the base substrate10) shows an arc surface recessed facing the base substrate10, so that an upper surface of the reflective layer40shows uneven shapes to realize an effect of diffuse reflection, and reflected light from different regions on the reflective layer40shows a relatively uniform output intensity. In a case that the light-emitting devices120are arranged on the connecting components20of the drive backplane110to form the light-emitting substrate100, the light-emitting uniformity of different regions on the light-emitting substrate100is better. It should be noted that when the top surface of the reflective layer40is of uneven shapes, the thickness of the reflective layer40is an average value of thicknesses of all regions.

Certainly, in other embodiments, the height of the barriers30may also be less than the thickness of the reflective layer40. In this case, the reflective layer40covers a top surface of the barriers30(that is, the side surface of the barrier30away from the base substrate10), the top surface of the reflective layer40is flat, and the diffuse reflection effect of the top surface of the reflective layer40is poor at this time, the reflectivity is however high.

Exemplarily, each group of the connecting components20may include a number of connecting pieces21spaced apart, and distance S between each connecting piece21and an adjacent barrier30is 50 μm-200 μm, that is, among the number of barriers30disposed around the connecting components20, the distance S between the barrier30disposed closest to the connecting piece21and the connecting piece21is set to 50 μm-200 μm, so that when the ink material is arranged to form the reflective layer40, a buffer distance is provided for the flow of the ink material, so as to prevent the ink material from flowing onto the connecting piece21and causing the connecting piece21to be covered. Exemplarily, the distance S between each connecting piece21and the adjacent barrier30may be 50 μm, 70 μm, 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, and the like.

Exemplarily, the connecting members21may be a pad, namely, the connecting members21are connected to the light-emitting devices120by soldering. Exemplarily, a material of the connecting members21may be metal, such as one or more of molybdenum (Mo), titanium (Ti), and copper (Cu).

Please combineFIG.1, each connecting component20may include two connecting pieces21spaced apart, one for connecting to a positive pole of the light-emitting devices120, and another for connecting to a negative pole of the light-emitting devices120.

Exemplarily, a distance L between adjacent barriers30may be 30 μm-200 μm, such as 30 μm, 50 μm, 80 μm, 100 μm, 130 μm, 150 μm, 170 μm, 200 μm, and the like. By setting the distance between adjacent barriers30to within a suitable range (30 μm-200 μm), the number of barriers30can effectively block the ink material when the ink material is disposed to form the reflective layer40, thereby reducing the fluidity of the ink material.

Exemplarily, a material of the barriers30may be a photoresist material, such as a positive photoresist material or a negative photoresist material. In a case that the material of the barriers30is a photoresist material, the barriers30may be prepared by coating a photoresist, and by exposure and development.

Exemplarily, a color of the reflective layer40may be white, so as to have a better reflective effect. A material of the reflective layer40may be an insulating material (e.g., resin material, etc.), so as to protect lines on the driving substrate50when the connecting pieces21and the light-emitting devices120are soldered.

Exemplarily, the base substrate10may be a thin film transistor (TFT) substrate, namely, the base substrate10includes TFT devices, so that the light-emitting devices120can be controlled to turn on or off by using the TFT devices.

Referring toFIGS.1-5, at least one ring of barriers30is disposed on a periphery of each group of the connecting components20, and the barriers30of a same ring are located on sides of a central symmetric figure. Exemplarily, the central symmetric figure may be a rectangle, a square, a circle, a triangle, a rhombus, and the like. When each group of the connecting components20includes two connecting pieces21, a center symmetry point of the central symmetric figure may coincide with a midpoint of a line connecting geometric centers of the two connecting pieces21.

Please refer toFIGS.4-5,FIG.4is a second schematic top view of a partial area of the drive backplane provided by an embodiment of the present application, andFIG.5is a schematic cross-sectional view of the drive backplane ofFIG.4along a B-B direction. By comparing the embodiments shown inFIGS.1-3with the embodiments shown inFIGS.4-5, it can be seen that in the embodiments shown inFIGS.1-3, a number of rings of barriers30are disposed on the periphery of each group of the connecting components20, and the barriers30of the same ring are located on sides of a rectangle, so that all regions of the reflective layer40are provided with the barriers30. In the embodiments shown inFIGS.4-5, a ring of barriers30are provided on the periphery of each group of the connecting components20, and the barriers30of the same ring are located on sides of the rectangle, that is, the barriers30are merely provided in the regions of the reflective layer40close to the connecting components20. As shown inFIGS.1-3, the number of barriers30are arranged in multiple rings on the periphery of the connecting components20, and the multiple rings may be two or more rings, such as three rings, four rings, five rings, six rings, and the like. As shown inFIGS.4-5, the number of barriers30are arranged in a ring on the periphery of the connecting component20.

Please refer toFIG.6.FIG.6is a flowchart of a method for preparing a drive backplane provided by an embodiment of the present application. An embodiment of the present application provides a method for preparing a drive backplane, including:

S100, with reference toFIG.7, providing a driving substrate50, the driving substrate50includes a base substrate10and connecting components20disposed on the base substrate10.

S200, with reference toFIGS.8-9, arranging a number of barriers30corresponding to a periphery of the connecting components20on the base substrate10, so as to arrange the number of barriers30around the connecting components20.

With reference toFIGS.8-9, the step of “arranging a number of barriers30corresponding to the periphery of the connecting components20on the base substrate10” may include:with reference toFIG.8, disposing a photoresist material on the base substrate10to form a photoresist layer60;with reference toFIG.9, patterning the photoresist layer60by means of exposure and development to form a number of barriers30located on the periphery of the connecting components20.

S300, with reference toFIG.9andFIG.3, disposing an ink material corresponding to the periphery of the connecting components20on the base substrate10, the ink material is connected with the number of barriers30, and a reflective layer40is formed after the ink material is cured, so as to dispose the number of barriers30inside the reflective layer40.

It should be understood that when the ink material corresponding to the periphery of the connecting components20is provided on the base substrate10, the ink material may be applied between adjacent barriers30, or may be applied on the periphery (namely, a side away from the connecting components20) of the number of barriers30.

Exemplarily, the ink material corresponding to the periphery of the connecting components20may be disposed on the base substrate10by means of screen printing or inkjet printing.

In the preparing method of the drive backplane provided by the embodiment of the present application, the number of barriers30are firstly arranged on the base substrate10, and then the ink material for forming the reflective layer40is arranged on the base substrate10. Under the blocking effect of the barriers30, the fluidity of the ink material decreases, and due to the surface tension between the outer surface of the barriers30and the ink material, the ink material can be attracted by the outer surface of the barriers30, thereby reducing the fluidity of the ink material. When the fluidity of the ink material decreases, the ink material does not easily flow to the position of the connecting components20, thereby avoiding the problem of the connecting components20being covered by the ink material, which can improve the soldering yield. In addition, when the fluidity of the ink material decreases, the ink material can be disposed at a position close to the connecting components20when the ink material is applied, so as to reduce the area of the opening41surrounded by the inner edge of the reflective layer40, and to increase the coverage area of the ink material (namely, the reflective layer40) on the drive backplane110. When the light-emitting devices120are disposed on the connecting components20of the drive backplane110to form the light-emitting substrate100, the drive backplane110has a high reflectivity for the lights given off by the light-emitting devices120, which not only can improve the light utilization of the light-emitting devices120, but also avoid the formation of dark regions between adjacent light-emitting devices120, thereby improving the light-emitting uniformity of the light-emitting substrate100.

In the related art, in order to reduce the fluidity of the ink material, a small amount of ink material is usually printed each time, and total amount of ink material required for preparing the reflective layer40is achieved by multiple printings, but this method reduces printing speed and increases printing cost due to large number of printing times and long printing time. In the preparing method of the drive backplane of the embodiment of the present application, the fluidity of the ink material is reduced by using the barriers30, so that the ink material for preparing the reflective layer40can be printed in one printing process, thereby improving printing efficiency and reducing printing costs.

Exemplarily, a number of openings41are defined on the reflective layer40, groups of the connecting components20are disposed on the base substrate10, and each opening41is provided with a group of the connecting components20. The sum of the areas of the number of openings41is a, and the area of the reflective layer40is b, and the aperture ratio a/(a+b) is 0.2%-30%.

Exemplarily, the cross-section of the barriers30is circular, the diameter of the cross-section of the barriers30is 1 μm-150 μm, and the height of the barriers30is 30 μm-150 μm.

Exemplarily, the thickness of the reflective layer40is 30 μm-150 μm.

Exemplarily, the top surface of the region between adjacent barriers30on the reflective layer40shows an arc surface recessed facing the base substrate10.

Exemplarily, each group of the connecting components20includes the number of connecting pieces21spaced apart, and the distance S between each connecting piece21and the adjacent barrier is 50 μm-200 μm.

Please refer toFIG.10.FIG.10is a schematic cross-sectional view of a light-emitting substrate provided by an embodiment of the present application. The embodiment of the present application provides a light-emitting substrate100, including a drive backplane110and light-emitting devices120, wherein the drive backplane110may be the drive backplane110in any of the above-mentioned embodiments, or the drive backplane110obtained by the method for preparing the drive backplane in any of the above-mentioned embodiments; the light-emitting devices120are electrically connected to the connecting components20of the drive backplane110.

Referring toFIG.10, when each group of the connecting components20includes two connecting pieces21spaced apart, a positive pole of the light-emitting devices120is connected to one of the connecting pieces21, and a negative pole of the light-emitting devices120is connected to another connecting piece21.

Exemplarily, the light-emitting devices120are LED devices, such as mini LEDs, micro LEDs, and the like.

It should be noted that the light-emitting substrate100may be a display panel, that is, used for displaying images, or the light-emitting substrate100may be used as a light source in a liquid crystal display device to provide backlight for a liquid crystal display panel.

Exemplarily, the light-emitting substrate100may be applied to display devices such as televisions, tablet computers, notebook computers, mobile phones, computer monitors, and advertising screens.

Please refer toFIG.11, in conjunction withFIG.3andFIG.10.FIG.11is a flowchart of a method for preparing a light-emitting substrate provided by an embodiment of the present application. The embodiment of the present application provides a method for preparing the light-emitting substrate, including:

S10, with reference toFIG.3, providing the drive backplane110in any of the above-mentioned embodiments, or preparing the drive backplane110according to the method for preparing the drive backplane in any of the above-described embodiments.

S20, with reference toFIG.10, providing the light-emitting devices120, so that the light-emitting devices120are electrically connected to the connecting components20of the drive backplane110to obtain the light-emitting substrate100.

Exemplarily, the light-emitting devices120are electrically connected to the connecting components20in the drive backplane110by soldering.

The drive backplane and the preparing method thereof, the light-emitting substrate and the preparing method thereof provided in the embodiments of the present application have been described in detail above. The specific examples herein are utilized to illustrate the principles and embodiments of the application. The description of the embodiments above is designed to assist in understanding the method and ideas of the present application. At the same time, persons skilled in the art could, based on the ideas in the application, make alterations to the specific embodiments and application scope, and thus the content of the present specification should not be construed as placing limitations on the present application.