CN113471239B - Display panel and display device - Google Patents
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- CN113471239B CN113471239B CN202110739418.4A CN202110739418A CN113471239B CN 113471239 B CN113471239 B CN 113471239B CN 202110739418 A CN202110739418 A CN 202110739418A CN 113471239 B CN113471239 B CN 113471239B
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- 239000010410 layer Substances 0.000 claims abstract description 143
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/483—Containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
Abstract
The embodiment of the invention discloses a display panel and a display device. Wherein the display panel includes: a substrate base; the functional layer is positioned on one side of the substrate and comprises a plurality of pixel grooves, and the side walls of the pixel grooves incline towards the direction deviating from the inside of the grooves along the direction of the substrate pointing to the functional layer; the rod-shaped light emitting diode comprises a first end and a second end, the rod-shaped light emitting diode extends along the side wall of the pixel groove, the first end points to the bottom of the pixel groove, and the second end points to the top of the pixel groove; the color conversion layer is at least partially arranged in the pixel groove and covers the rod-shaped light-emitting diode. According to the embodiment of the invention, the stereoscopic pixel structure can be formed by the stereoscopic arrangement of the rod-type light emitting diode. The three-dimensional pixel structure can gather light rays emitted by the rod-shaped light-emitting diode, so that the color conversion layer is fully excited by the rod-shaped light-emitting diode, and the conversion efficiency of the color conversion layer is greatly improved.
Description
Technical Field
The embodiment of the invention relates to a display technology, in particular to a display panel and a display device.
Background
Since the light emitting device of the Micro light emitting diode (Micro LED) display is composed of an inorganic material, it has advantages of high brightness, long life, and the like, compared with the OLED display. Micro LED devices formed on a sapphire or silicon substrate or other substrate may be formed on a TFT array substrate by a transfer method and electrically connected. However, in array fabrication, the common mass transfer process has the problems of low yield and complex process. Based on this, a rod light emitting diode (nano LED) has been invented, which can realize the regular arrangement of Micro LEDs with high efficiency and high yield, and can realize high PPI due to its small size.
The solution for implementing color display by the rod-type light emitting diode device is to position the rod-type light emitting diode on the substrate at a planar angle, and to provide a photoluminescent layer directly above the rod-type light emitting diode. Such placement of the rod-type light emitting diode device results in a rod-type light emitting diode having poor excitation efficiency for photoluminescent materials in the photoluminescent layer.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for improving the excitation efficiency of a light-emitting unit to photoluminescent materials in a photoluminescent layer.
In a first aspect, an embodiment of the present invention provides a display panel, including: a substrate base; the functional layer is positioned on one side of the substrate and comprises a plurality of pixel grooves, and the side walls of the pixel grooves incline towards the direction deviating from the inside of the grooves along the direction of the substrate pointing to the functional layer; the rod-shaped light emitting diode comprises a first end and a second end, the rod-shaped light emitting diode extends along the side wall of the pixel groove, the first end points to the bottom of the pixel groove, and the second end points to the top of the pixel groove; the color conversion layer is at least partially arranged in the pixel groove and covers the rod-shaped light-emitting diode.
In a second aspect, an embodiment of the present invention further provides a display apparatus, including the display panel.
The embodiment of the invention comprises the steps of arranging a substrate base plate; the functional layer is positioned on one side of the substrate and comprises a plurality of pixel grooves, and the side walls of the pixel grooves incline towards the direction deviating from the inside of the grooves along the direction of the substrate pointing to the functional layer; the rod-shaped light emitting diode comprises a first end and a second end, the rod-shaped light emitting diode extends along the side wall of the pixel groove, the first end points to the bottom of the pixel groove, and the second end points to the top of the pixel groove; the color conversion layer is at least partially arranged in the pixel groove and covers the rod-shaped light-emitting diode. By means of the mode of arranging the rod-shaped light emitting diode in the three-dimensional mode, a three-dimensional pixel structure can be formed. The three-dimensional pixel structure can gather light rays emitted by the rod-shaped light-emitting diode, so that the color conversion layer is fully excited by the rod-shaped light-emitting diode, and the conversion efficiency of the color conversion layer is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel provided in the prior art;
fig. 2 is a schematic cross-sectional structure of a display panel according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
FIG. 6 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
Fig. 7 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of a bar-type light emitting diode according to an embodiment of the present invention;
FIG. 9 is a cross-sectional view of the section at dashed line A1A2 of FIG. 8;
Fig. 10 is a schematic structural diagram of another bar-type led according to an embodiment of the present invention;
FIG. 11 is a cross-sectional view of the section at dashed line A3A4 of FIG. 10;
FIG. 12 is another cross-sectional view of the cross-section at dashed line A3A4 of FIG. 10;
FIG. 13 is a schematic cross-sectional view of another display panel according to an embodiment of the invention;
fig. 14 is a schematic cross-sectional view of another display panel according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a schematic structural diagram of a display panel provided in the prior art, see fig. 1. In the related art, the color conversion layer 02 is provided above the light emitting device 01, and the color conversion layer 02 containing the color conversion material is irradiated with light emission by the light emitting device 01, thereby exciting the color conversion material to emit light. Such a structure often fails to sufficiently excite the color conversion material to perform light color conversion, and light emitted from the light emitting device cannot be sufficiently utilized by the color conversion material, resulting in a large number of color conversion materials being used. On the one hand, the cost of the display panel is high, and on the other hand, the color conversion layer is thick, so that the manufacturing difficulty of the color conversion layer is high.
Fig. 2 is a schematic cross-sectional structure of a display panel according to an embodiment of the present invention, and fig. 3 is a schematic cross-sectional structure of another display panel according to an embodiment of the present invention, see fig. 2 and fig. 3. Based on the foregoing, an embodiment of the present invention provides a display panel, including:
A substrate 1; a functional layer 2 positioned on one side of the substrate 1, the functional layer 2 comprising a plurality of pixel grooves 3, the side walls of the pixel grooves 3 being inclined in a direction away from the inside of the grooves along the direction in which the substrate 1 points to the functional layer 2; a bar-type light emitting diode 4, the bar-type light emitting diode 4 including a first end and a second end, the bar-type light emitting diode 4 extending along a sidewall of the pixel groove 3, the first end being directed to a bottom of the pixel groove 3, the second end being directed to a top of the pixel groove 3; and a color conversion layer 5, wherein the color conversion layer 5 is at least partially arranged in the pixel groove 3 and covers the rod-shaped light emitting diode 4.
Wherein the functional layer 2 is a film layer for realizing a part of functions of the substrate 1, and the functional layer 2 comprises a pixel groove 3 for providing a accommodation space for the rod-shaped light emitting diode 4. A rod-shaped light emitting diode 4 and a color conversion layer 5 are arranged in the pixel groove 3. Alternatively, the rod type light emitting diode 4 may be disposed around the color conversion layer 5, and the pixel groove 3 may be filled with the color conversion layer 5 after the rod type light emitting diode 4 is disposed at the sidewall of the pixel groove 3. The height of the color conversion layer 5 may be greater than or equal to the height of the rod-shaped light emitting diode 4. Wherein the rod type light emitting diode 4 may include a first semiconductor layer, an insulating outer layer, an active layer, and a second semiconductor layer. The active layer of the rod type light emitting diode 4 can realize 360-degree light emission under the excitation of an external power supply. The first end of the bar-type light emitting diode 4 may be connected to the first semiconductor layer or the second semiconductor layer, and the second end of the bar-type light emitting diode 4 may be connected to a semiconductor layer of the first semiconductor layer or the second semiconductor layer that is not connected to the first end of the bar-type light emitting diode 4. The color conversion layer 5 may convert the light emitted by the rod-type light emitting diode 4 into light of any desired color, and the embodiment of the present invention is not limited to the color of the light converted by the color conversion layer 5, and the color of the light converted by the color conversion layer 5 may be determined according to actual needs. The color conversion material in the color conversion layer 5 may include any material capable of converting light color, such as a quantum dot material or a phosphor, and the embodiment of the present invention is not limited to the specific composition of the color conversion material. The light emission color of the rod type light emitting diode 4 may be any color, for example, blue.
Fig. 4 is a schematic cross-sectional structure of another display panel according to an embodiment of the invention, see fig. 4. In other embodiments, the color conversion layer 5 includes a first color conversion layer 51 and a second color conversion layer 52 in different pixel grooves 3, and the colors of light converted by the first color conversion layer 51 and the second color conversion layer 52 are different.
The color of the light emitted from the first color conversion layer 51 and the second color conversion layer 52 may be determined according to actual needs. For example, when the emission color of the rod-shaped light emitting diode 4 is blue, a quantum dot material capable of converting red light may be provided in the first color conversion layer 51, and a quantum dot material capable of converting green light may be provided in the second color conversion layer 52. And three rod-shaped light emitting diodes 4 are provided, a first color conversion layer 51 is provided above a first rod-shaped light emitting diode 4, a second color conversion layer 52 is provided above a second rod-shaped light emitting diode 4, and no color conversion layer 5 is provided above a third rod-shaped light emitting diode 4. The three bar-type light emitting diodes 4 described above may be used as three sub-pixels in one pixel.
Fig. 5 is a schematic cross-sectional structure of another display panel according to an embodiment of the invention, see fig. 5. In other embodiments, the pixel groove 3 includes a first pixel groove 31 corresponding to a first color light and a second pixel groove 32 corresponding to a second color light, the wavelength of the first color light being greater than the wavelength of the second color light; the opening of the second pixel groove 32 is larger than the opening of the first pixel groove 31.
For color conversion materials, particularly quantum dot materials, the longer the wavelength of light converted by the color conversion material, the higher the brightness of the converted light, with the same excitation light provided by the rod-shaped light emitting diode 4. The color of the emergent light corresponding to the first pixel groove 31 is the first color light, the color of the emergent light corresponding to the second pixel groove 32 is the second color light, and the emergent light refers to the light emitted by the rod-shaped light emitting diode 4 in the pixel groove 3 after being converted by the color conversion layer 5. For example, the first color light is green light and the second color light is blue light. The opening of the first pixel groove 31 corresponding to the first color light may be set smaller, and the opening of the second pixel groove 32 corresponding to the second color light may be set larger, so as to compensate the light-emitting brightness difference between the quantum dot material emitting green light and the quantum dot material emitting blue light by changing the size of the light outlet of the pixel groove 3.
On the basis of the above embodiment, the cross section of the pixel groove 3 is in an inverted trapezoid along the cross section perpendicular to the plane of the substrate 1; the upper bottom and waist of the inverted trapezoid cross section of the second pixel groove 32 are α 1, and the upper bottom and waist of the inverted trapezoid cross section of the first pixel groove 31 have an included angle α 2,α1>α2.
The excited efficiency of the first color light is higher than that of the second color light, so that the gathering effect of the light rays with different colors can be changed by setting different inclination angles of the side wall of the pixel groove 3, and the emergent intensity of the light rays with different colors can be further changed. The first color light is green light, and the second color light is blue light, and because the excited efficiency of the green light quantum dot material is higher, the inclination angle of the side wall of the first pixel groove 31 can be set larger, so that the included angle alpha 2 between the upper bottom of the inverted trapezoid section of the first pixel groove 31 and the waist is smaller than the included angle alpha 1 between the upper bottom of the inverted trapezoid section of the second pixel groove 32 and the waist. The gathering effect of green light is reduced, and the light intensity of blue light and green light is balanced.
Optionally, the included angle between the upper bottom of the inverted trapezoid and the waist is greater than or equal to 145 degrees.
The included angle between the inverted trapezoid upper bottom and the waist is set to be larger than or equal to 145 degrees, so that the pixel groove 3 has a good light gathering effect, and the display panel can be ensured to have a good visual angle while certain emergent light intensity can be ensured.
Fig. 6 is a schematic cross-sectional structure of another display panel according to an embodiment of the invention, see fig. 6. In other embodiments, the volume of the first pixel groove 31 is smaller than the volume of the second pixel groove 32.
Since the excited efficiency of the first color light is higher than that of the second color light, the volume of the first pixel groove 31 can be set smaller than that of the second pixel groove 32. The volumes of the color conversion layer 5 and the rod type light emitting diode 4 in the first pixel groove 31 and the second pixel groove 32 are adjusted to adjust the emergent amounts of the first color light and the second color light. Alternatively, the light intensity of the first color light may be made equal to the light intensity of the second color light.
In other embodiments, the color conversion layer 5 includes a third color conversion layer, and the color of the light converted by the third color conversion layer is white; the display panel further comprises a color filter layer arranged on one side of the functional layer 2 away from the substrate 1.
The backlight of the display panel may include a substrate base 1, a rod type light emitting diode 4, and a color conversion layer 5. The color conversion layer 5 includes a third color conversion layer. Alternatively, if the rod type light emitting diode 4 emits blue light, the third color conversion layer may be a quantum dot material that converts red light and green light, and may also be a quantum dot material that converts yellow light. The light emitted by the rod-shaped light-emitting diode 4 is mixed with the light which is not converted by the rod-shaped light-emitting diode 4 and emitted after being converted by the third color conversion layer, and the color of the emitted light is white. The color filter layer can convert the light emitted by the pixel groove 3 into red, green and blue. Optionally, when white light is emitted, the display panel can be used as a backlight source, and the display panel can further comprise a liquid crystal box and polarizing films positioned on two sides of the liquid crystal box, wherein the brightness of the red, green and blue sub-pixels can be adjusted by controlling the deflection of the liquid crystal box, so that the picture display can be realized.
With continued reference to fig. 3. In other embodiments, at least two rod-shaped light emitting diodes 4 are arranged in the pixel recess 3.
The pixel groove 3 may include not only one bar-type light emitting diode 4, but also two or more bar-type light emitting diodes 4. By increasing the number of the bar-type light emitting diodes 4, the light emitting brightness of the pixel groove 3 can be increased. Thereby increasing the overall brightness of the display panel.
On the basis of the above embodiment, the pixel grooves 3 are in the shape of a truncated cone, and the bar-shaped light emitting diodes 4 located in the same pixel groove 3 are arranged around the groove along the side wall of the pixel groove 3.
Wherein the orthographic projections of the rod-shaped light emitting diodes 4 may be arranged circumferentially along the side walls. The plurality of light emitting diodes jointly excite the color conversion layer 5. The color conversion layer 5 is fully utilized, and the illumination intensity of the emergent light of the pixel groove 3 is further increased.
On the basis of the above embodiment, the diameter of the bottom surface of the side of the pixel groove 3 close to the substrate base plate 1 is greater than or equal to 1.5 times the axial length of the bar-type light emitting diode 4.
Wherein ink jet print drops can be ejected into the pixel grooves 3 during ink jet printing to effect transfer of the bar type light emitting diode 4 to the pixel grooves 3. The bottom of the pixel recess 3 may be precipitated with the bar-type light emitting diode 4. When the diameter of the bottom surface of the side, close to the substrate 1, of the pixel groove 3 is greater than or equal to 1.5 times of the axial length of the rod-shaped light-emitting diode 4, the rod-shaped light-emitting diode 4 deposited at the bottom of the pixel groove 3 can be better prevented from contacting electrodes of the rod-shaped light-emitting diode 4 at other correct positions through the first end and the second end.
In other embodiments, the sidewall of the pixel groove 3 includes at least one alignment member for aligning the rod-shaped light emitting diode 4 in the pixel groove 3.
In the prior art, for alignment of the rod-type light emitting diode 4, an electromagnetic field alignment method is mostly adopted, and the electromagnetic field alignment method is used to realize high alignment rate under a higher voltage, so that the complexity of wiring is higher, the area of a non-display area of the display panel is further enlarged, and the display resolution of the display panel is indirectly reduced. In addition, since the electromagnetic field positioning can only position the rod-type light emitting diode 4 at a plane angle, the design of the pixel structure in space is limited. Aiming at the problems existing in the prior art, the alignment component is arranged in the side wall of the pixel groove 3 to relieve the problems.
The alignment component is used for installing the rod-shaped light emitting diode 4 in the side wall of the pixel groove 3, and after the alignment component is aligned with the rod-shaped light emitting diode 4, the rod-shaped light emitting diode 4 can be more firmly arranged in the side wall of the pixel groove 3, and the process of installing the rod-shaped light emitting diode 4 in the side wall of the pixel groove 3 can be more smooth. For example, the first end and the second end of the bar-type light emitting diode 4 may be provided in different shapes, and the alignment members may be adapted to the contour of the correctly mounted bar-type light emitting diode 4. Thus, the dependence on the electromagnetic field alignment method can be reduced.
Fig. 7 is a schematic cross-sectional structure of another display panel according to an embodiment of the invention, see fig. 7. On the basis of the above embodiment, the alignment element 6 comprises at least one alignment electrode 61 and/or at least one magnetic region 62.
In the process of ink-jet printing to realize the transfer of the bar-type light-emitting diode 4 to the pixel groove 3, a voltage may be applied to the electrode plate of the counter electrode 61 to form an electric field, so that the bar-type light-emitting diode 4 deflects according to the direction of the electric field under the action of the electric field force. One end of the rod-shaped light emitting diode 4 faces the direction of the electric field, and the other end faces the opposite direction of the electric field. The pose of the rod-shaped light emitting diode 4 in the ink jet printing solution can be adjusted to the correct pose.
Or the magnetic region 62 may be disposed on the alignment member 6, so that the rod-shaped light emitting diode 4 that can be attracted by the magnetic substance can be attracted during the process of transferring the rod-shaped light emitting diode 4 to the pixel groove 3 by means of ink-jet printing, and the rod-shaped light emitting diode 4 can be attached to the magnetic region 62. The assembly of the bar-type light emitting diode 4 in the above manner can completely omit the non-display area wiring required for the electromagnetic field alignment method, and avoid the adverse effect of the non-display area wiring on the display panel.
Alternatively, the alignment electrode 61 may be provided at the same time as the magnetic region 62 is provided on the alignment member 6. A voltage is applied to the counter electrode 61 to form an electric field so that the rod type light emitting diode 4 is deflected by the force of the electric field according to the direction of the electric field. At the same time, the bar-type light emitting diode 4 attracted by the magnetic substance is attracted by the magnetic region 62, and the bar-type light emitting diode 4 can be attached to the magnetic region 62. The mounting of the bar-type light emitting diode 4 in this manner can partially omit the non-display area wiring required for the electromagnetic field alignment method, reducing the adverse effect of the non-display area wiring on the display panel.
On the basis of the above embodiment, the alignment member 6 includes the alignment electrode 61 and the first magnetic region arranged in the same layer.
Wherein, the alignment member 6 comprises an alignment electrode 61 and a first magnetic region, and the alignment electrode 61 and the first magnetic region are arranged on the same layer. Alternatively, one of the plates of the counter electrode 61 may be disposed around the first magnetic region.
Fig. 8 is a schematic structural view of a bar-type light emitting diode according to an embodiment of the present invention, fig. 9 is a cross-sectional view of a section at a broken line A1A2 in fig. 8, fig. 10 is a schematic structural view of another bar-type light emitting diode according to an embodiment of the present invention, fig. 11 is a cross-sectional view of a section at a broken line A3A4 in fig. 10, and fig. 12 is another cross-sectional view of a section at a broken line A3A4 in fig. 10. Referring to fig. 8 to 12, the rod-shaped light emitting diode 4 includes a first electrode 41, a first semiconductor layer 42, an active layer 43, a second semiconductor layer 44, and a second electrode 45, which are sequentially stacked in the axial direction, on the basis of the above embodiment; the bar-type light emitting diode 4 comprises a second magnetic region 7 corresponding to the first magnetic region, the second magnetic region 7 comprising a continuous magnetic layer surrounding the axis of the bar-type light emitting diode 4 or a plurality of discontinuous magnetic layers arranged around the axis of the bar-type light emitting diode 4.
The first electrode 41 may be an electrode connected to the first semiconductor layer 42, and the second electrode 45 may be an electrode connected to the second semiconductor layer 44. The bar-type light emitting diode 4 communicates with an external circuit through the first pole 41 and the second pole 45. A second magnetic region 7 may be disposed on the bar-type led 4 to assist the bar-type led 4 to be attracted to the alignment member 6 during alignment of the bar-type led 4. The second magnetic region 7 may comprise a magnetic material. The magnetic material may be a continuous magnetic layer disposed around the axis of the rod-shaped light emitting diode 4 or may be an intermittent magnetic layer disposed around the axis of the rod-shaped light emitting diode 4. For the scheme of disposing the discontinuous magnetic layer around the axis of the rod-type light emitting diode 4, the discontinuous magnetic layer may include a rectangular parallelepiped magnetic material, a square magnetic material, a cylindrical magnetic material, or a spherical magnetic material, and the embodiment of the present invention is not limited to the shape of the magnetic material of the discontinuous magnetic layer.
On the basis of the above embodiment, the second magnetic region 7 is located within the first pole 41 and/or the second pole 45.
Wherein, the second magnetic region 7 may be disposed in the first pole 41 and/or the second pole 45 of the rod-shaped light emitting diode 4, and the second magnetic region 7 disposed in the electrode of the rod-shaped light emitting diode 4 may avoid the occupation of the first semiconductor layer 42, the active layer 43 or the second semiconductor layer 44, thereby avoiding affecting the light emitting performance of the rod-shaped light emitting diode 4.
Fig. 13 is a schematic cross-sectional structure of another display panel according to an embodiment of the invention, see fig. 13. In other embodiments, the bar-type light emitting diode 4 includes two second magnetic regions 7 located at both ends of the bar-type light emitting diode 4; the functional layer 2 includes a first electrode layer 611, a first insulating layer 8, a second electrode layer 612, and a second insulating layer 9 laminated in this order in a direction away from the substrate 1, and a side of the first electrode layer 611 and the second electrode layer 612 near the sidewall of the pixel groove 3 is provided with a first magnetic region 621 corresponding to the second magnetic region 7.
Wherein the bar-type light emitting diode 4 comprises two second magnetic regions 7 and the functional layer 2 comprises two first magnetic regions 621 corresponding to the second magnetic regions 7. Through the cooperation of the two pairs of magnetic areas, the adsorption capacity of the alignment part 6 to the rod-shaped light-emitting diode 4 is stronger, and the alignment precision of the rod-shaped light-emitting diode 4 for alignment relative to the alignment part 6 is higher. The arrangement of the first magnetic region 621 and the second magnetic region 7 improves the assembly accuracy of the bar-type light emitting diode 4.
The first insulating layer 8 and the second insulating layer 9 belong to insulating layers, and because a certain static friction force exists between the insulating layers and the rod-shaped light emitting diode 4, after the ink-jet printing solvent is removed, the double effects of the static friction force and magnetic adsorption between the insulating layers and the rod-shaped light emitting diode 4 can be utilized, so that the risk that the rod-shaped light emitting diode 4 slides off from the side wall of the pixel groove 3 is reduced.
Fig. 14 is a schematic cross-sectional view of another display panel according to an embodiment of the invention, see fig. 14. On the basis of the above embodiment, the functional layer 2 further includes a first contact electrode 10 and a second contact electrode 11, the first contact electrode 10 is located on a side of the second insulating layer 9 away from the substrate, the second contact electrode 11 is located at the bottom of the pixel groove 3, the first contact electrode 10 is electrically connected to one electrode of the bar-type light emitting diode 4, and the second contact electrode 11 is electrically connected to the other electrode of the bar-type light emitting diode 4.
The first contact electrode 10 may be disposed on top of the second insulating layer 9 and extend to be in electrical contact with a certain pole of the rod-type light emitting diode 4. The second contact electrode 11 is disposed at the bottom of the pixel groove 3. Through the alignment process, the rod-shaped light emitting diode 4 can be aligned with the alignment member 6. One pole of the aligned rod-shaped light emitting diode 4 is electrically connected with the first contact electrode 10, and the other pole of the rod-shaped light emitting diode 4 is electrically connected with the second contact electrode 11. After alignment, the rod-shaped light emitting diode 4 is placed at the position corresponding to the contact electrode of the functional layer 2, so that the workload of the rod-shaped light emitting diode 4 in the transplanting process is greatly reduced.
In other embodiments, at least one of the first electrode layer 611 and the second electrode layer 612 is a reflective electrode layer.
Wherein the first electrode layer 611 and/or the second electrode layer 612 may be provided as reflective electrode layers. The surface of the electrode layer may be smoothed to make the reflectivity of the electrode layer high. It is also possible to provide a material having a higher reflectivity than the host material of the first electrode layer 611 and/or the second electrode layer 612 on the side of the first electrode layer 611 and/or the second electrode layer 612 that is open to the pixel recess 3. The reflecting electrode layer can reflect more light rays emitted to the bottom of the pixel groove 3, and the light emitting rate of the pixel groove 3 is improved.
In other embodiments, the alignment feature 6 includes a first alignment feature 61 (alignment electrode) and a second alignment feature 62 (magnetic region), the second alignment feature 62 being located on a side of the first alignment feature 61 away from the substrate 1, and a projection of the first alignment feature 61 onto the substrate 1 being located within a projection of the second alignment feature 62 onto the substrate 1.
Wherein the bar-type light emitting diode 4 may be mounted in the pixel groove 3 in a posture in which the axis of the bar-type light emitting diode 4 is perpendicular to the plane of the substrate 1. In response, the first alignment member 61 and the second alignment member 62 may be arranged in a positional relationship in which a line segment formed by the first alignment member 61 and the second alignment member 62 is perpendicular to the plane in which the substrate 1 is located. The light is emitted through the light emitting side wall of the rod-shaped light emitting diode 4, and the color conversion material is fully excited to emit light. The color purity of the light emitted from the pixel groove 3 is improved.
In other embodiments, with continued reference to fig. 11, the display panel provided in this embodiment further includes a third insulating layer 12 located on a side of the color conversion layer 5 near the substrate 1, where the scattering particles 121 are disposed in the third insulating layer 12.
The scattering particles 121 in the third insulating layer 12 can scatter the light emitted to the substrate 1 in all directions, so as to further improve the excited efficiency of the color conversion material, so that the intensity of the light emitted from the pixel groove 3 is higher, and the intensity of the light at each light emitting angle is more uniform.
In other embodiments, the surface of the color conversion layer 5 on the side away from the substrate 1 is separated from the substrate 1 by a distance L1, and the end of the rod-shaped light emitting diode 4 on the side away from the substrate 1 is separated from the substrate 1 by a distance L2,2 μm.ltoreq.L1-L2.ltoreq.7μm.
Wherein the thickness of the color conversion layer 5 may be set to between 2 μm and 7 μm (including 2 μm and 7 μm). The advantage of this arrangement is that the excitation light emitted by the rod-shaped light-emitting diode 4 can be fully utilized, and the color purity of the light emitted by the pixel groove 3 is better. It is also sufficiently ensured that the outgoing light is not blocked by the excessively thick color conversion layer 5, resulting in a weakening of the outgoing light intensity. Therefore, the thickness of the color conversion layer 5 can improve the display performance of the display panel and optimize the display effect of the display panel.
The embodiment of the invention also provides a display device which comprises any display panel.
The display device provided by the embodiment of the invention comprises the display panel provided by any embodiment of the invention, so that the display device has the same or corresponding beneficial effects as the display panel provided by any embodiment.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (21)
1. A display panel, comprising:
A substrate base;
The functional layer is positioned on one side of the substrate and comprises a plurality of pixel grooves, and the side walls of the pixel grooves incline towards the direction deviating from the inside of the grooves along the direction of the substrate pointing to the functional layer;
A bar-type light emitting diode including a first end and a second end, the bar-type light emitting diode extending along a sidewall of the pixel groove, the first end pointing to a bottom of the pixel groove, the second end pointing to a top of the pixel groove;
the color conversion layer is at least partially arranged in the pixel groove and covers the rod-shaped light-emitting diode;
The side wall of the pixel groove comprises at least one alignment component, and the alignment component is used for aligning the rod-shaped light emitting diode in the pixel groove;
The first end and the second end of the rod-shaped light emitting diode are arranged in different shapes, and the alignment part is matched with the outline of the rod-shaped light emitting diode.
2. The display panel according to claim 1, wherein the color conversion layer includes a first color conversion layer and a second color conversion layer in different ones of the pixel grooves, the first color conversion layer and the second color conversion layer converting different colors of light.
3. The display panel of claim 1, wherein the pixel grooves include a first pixel groove corresponding to a first color light and a second pixel groove corresponding to a second color light, the first color light having a wavelength greater than a wavelength of the second color light;
the opening of the second pixel groove is larger than the opening of the first pixel groove.
4. A display panel according to claim 3, wherein the cross section of the pixel recess is inverted trapezoidal along a cross section perpendicular to the plane of the substrate;
the upper bottom and the waist of the inverted trapezoid cross section of the second pixel groove are alpha 1, and the included angle between the upper bottom and the waist of the inverted trapezoid cross section of the first pixel groove is alpha 2,α1>α2.
5. A display panel according to claim 3, wherein the volume of the first pixel recess is smaller than the volume of the second pixel recess.
6. The display panel of claim 4, wherein an angle between an upper base of the inverted trapezoid and the waist is greater than or equal to 145 °.
7. The display panel according to claim 1, wherein the color conversion layer includes a third color conversion layer, and the color of light converted by the third color conversion layer is white;
The display panel further comprises a color filter layer, and the color filter layer is arranged on one side, far away from the substrate, of the functional layer.
8. The display panel of claim 1, wherein at least two of the rod-shaped light emitting diodes are disposed in the pixel groove.
9. The display panel of claim 8, wherein the pixel grooves are frustoconical in shape, and the bar-type light emitting diodes located in the same pixel groove are arranged around the groove along the side walls of the pixel groove.
10. The display panel according to claim 9, wherein a diameter of a bottom surface of the pixel groove on a side close to the substrate is greater than or equal to 1.5 times an axial length of the bar-type light emitting diode.
11. The display panel according to claim 1, wherein the alignment feature comprises at least one alignment electrode and/or at least one magnetic region.
12. The display panel of claim 11, wherein the alignment feature comprises an alignment electrode and a first magnetic region disposed in a same layer.
13. The display panel according to claim 12, wherein the rod-shaped light emitting diode includes a first electrode, a first semiconductor layer, an active layer, a second semiconductor layer, and a second electrode which are sequentially stacked in an axial direction;
The bar-type light emitting diode includes a second magnetic region corresponding to the first magnetic region, the second magnetic region including a continuous magnetic layer or a plurality of discontinuous magnetic layers arranged around an axis of the bar-type light emitting diode.
14. The display panel of claim 13, wherein the second magnetic region is located within the first pole and/or second pole.
15. The display panel of claim 13, wherein the bar-type light emitting diode comprises two second magnetic regions at both ends of the bar-type light emitting diode;
The functional layer comprises a first electrode layer, a first insulating layer, a second electrode layer and a second insulating layer which are sequentially laminated along the direction away from the substrate, wherein a first magnetic region corresponding to the second magnetic region is arranged on one side, close to the side wall of the pixel groove, of the first electrode layer and the second electrode layer.
16. The display panel of claim 1, wherein the alignment features comprise a first alignment feature and a second alignment feature, the second alignment feature being located on a side of the first alignment feature remote from the substrate, a projection of the first alignment feature on the substrate being located within a projection of the second alignment feature on the substrate.
17. The display panel of claim 15, wherein the functional layer further comprises a first contact electrode and a second contact electrode, the first contact electrode is located on a side of the second insulating layer away from the substrate, the second contact electrode is located at a bottom of the pixel groove, the first contact electrode is electrically connected to one pole of the bar-type light emitting diode, and the second contact electrode is electrically connected to the other pole of the bar-type light emitting diode.
18. The display panel of claim 15, wherein at least one of the first electrode layer and the second electrode layer is a reflective electrode layer.
19. The display panel according to claim 1, further comprising a third insulating layer located on a side of the color conversion layer close to the substrate, wherein scattering particles are provided in the third insulating layer.
20. The display panel according to claim 1, wherein a distance between a surface of the color conversion layer on a side away from the substrate and the substrate is L1, and a distance between an end of the bar-type light emitting diode on a side away from the substrate and the substrate is L2, and L1-L2 is 2 μm or less and 7 μm or less.
21. A display device comprising the display panel according to any one of claims 1 to 20.
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| CN114203725A (en) * | 2021-11-11 | 2022-03-18 | 深圳市思坦科技有限公司 | Micro light-emitting diode display panel and preparation method thereof |
| CN114447185B (en) * | 2022-01-25 | 2023-10-17 | Tcl华星光电技术有限公司 | Micro LED lamp and transfer device and spray type huge transfer method thereof |
| WO2024000421A1 (en) * | 2022-06-30 | 2024-01-04 | 京东方科技集团股份有限公司 | Display substrate and display apparatus |
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