Display panel, light-emitting chip thereof and display device

Abstract

The invention discloses a display panel, a light-emitting chip thereof and a display device. The light-emitting chip comprises a driving layer, a first electrode layer, an inorganic electroluminescent layer, a second electrode layer, a light shielding layer and a light filtering layer, the inorganic electroluminescent layer is powered by the first electrode layer and the second electrode layer and emits light in response to driving current generated by the first electrode layer and the second electrode layer; the light filtering layer can perform color conversion on light emitted by the inorganic electroluminescent layer; the shading layer is electrically connected with the driving layer; the driving layer can control the light shielding layer to expand or retract inwards so as to control whether the light shielding layer shields light emitted by the inorganic electroluminescent layer or not. The display problem existing in an existing display panel can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a light-emitting chip thereof, and a display device. Background Art

[0002] With the widespread application of display panels and technological progress, their types have evolved from cathode ray tubes (CRT), liquid crystal displays (LCD) to organic light emitting diode displays (OLED), etc. Among them, LCD display panels or OLED display panels have been widely used in recent years, but these two display panels still have some display problems. For example, LCD display panels generally use liquid crystal display screens plus backlight sources as the basic components for image display. The liquid crystal display screen and backlight source are controlled and powered separately, and have high power consumption. The light-emitting unit of the OLED display panel comes from organic matter. The loss of organic matter will reduce the life of the OLED display panel and cause the OLED display panel to have color deviation problems. Summary of the invention

[0003] The present invention provides a display panel and a light emitting chip thereof, and a display device, so as to improve the display problem existing in the existing display panel.

[0004] According to one aspect of the present invention, a light-emitting chip of a display panel is provided, the light-emitting chip comprising: a driving layer, a first electrode layer, an inorganic electroluminescent layer, a second electrode layer, a light shielding layer and a light filter layer;

[0005] The inorganic electroluminescent layer is powered by the first electrode layer and the second electrode layer, and emits light in response to a driving current generated by the first electrode layer and the second electrode layer;

[0006] The filter layer can convert the color of the light emitted by the inorganic electroluminescent layer;

[0007] The light shielding layer is electrically connected to the driving layer; the driving layer can control the light shielding layer to expand or retract, so as to control whether the light shielding layer blocks the light emitted by the inorganic electroluminescent layer.

[0008] Optionally, the inorganic electroluminescent layer includes: a rare earth long afterglow luminescent film, an inorganic long afterglow luminescent film or a super afterglow polymerized film.

[0009] Optionally, the light-shielding layer includes: an electrothermal ultra-fiber micro-sheet light-shielding layer or a liquid crystal elastomer light-shielding layer.

[0010] Optionally, the filter layer comprises: a glass substrate, and filter monomers of different colors arranged on the glass substrate; the filter monomers can convert the light emitted by the inorganic electroluminescent layer into different colors;

[0011] The light shielding layer includes: a plurality of light shielding sub-units, and the light shielding sub-units are arranged in one-to-one correspondence with the light filter monomers, so that the light shielding sub-units can shield the light emitted from the inorganic electroluminescent layer corresponding to the light filter monomer area when unfolded.

[0012] Optionally, the orthographic projection of the light-shielding sub-unit filter monomer on the driving layer in a fully unfolded state coincides with the orthographic projection of the light-shielding sub-unit on the driving layer.

[0013] Optionally, the filter monomers include at least two of a red filter monomer, a green filter monomer, a blue filter monomer and a white filter monomer.

[0014] Optionally, the shading sub-unit includes a first power supply node, and the first power supply node is connected to the driving layer; the driving layer can control the unfolding state of each of the shading sub-units.

[0015] Optionally, the driving layer includes a plurality of driving circuits, and the plurality of driving circuits are arranged in a one-to-one correspondence with the plurality of light-shielding sub-units; each of the driving circuits is used to respectively control the unfolding state of each of the light-shielding sub-units.

[0016] Optionally, the shading sub-unit has different extension degrees; the driving circuit is further used to control the expansion area of ​​the shading sub-unit; wherein the expansion area of ​​the shading sub-unit is used to adjust the light output brightness corresponding to the filter monomer.

[0017] Optionally, the shading sub-unit has two states: expanded and retracted; the driving circuit is also used to control the expansion or retraction of the shading sub-unit; wherein, when the shading sub-unit is expanded, the corresponding filter monomer is in a dark state.

[0018] Optionally, the filter layer comprises: a glass substrate, and filter monomers of different colors arranged on the glass substrate; the filter monomers can convert the light emitted by the inorganic electroluminescent layer into different colors; wherein at least two filter monomers of different colors constitute a display pixel;

[0019] The light shielding layer includes: a plurality of light shielding sub-units, and the light shielding sub-units are arranged in a one-to-one correspondence with the display pixels, so that the light shielding sub-units can shield the light emitted from the inorganic electroluminescent layer corresponding to the display pixel area when unfolded.

[0020] Optionally, the filter layer comprises: a glass substrate, and filter monomers of different colors arranged on the glass substrate; the filter monomers can convert the light emitted by the inorganic electroluminescent layer into different colors;

[0021] The inorganic electroluminescent layer includes: a plurality of light-emitting sub-units, and the light-emitting sub-units are arranged in one-to-one correspondence with the light-filtering monomers.

[0022] Optionally, the first power supply node is an anode node, the first electrode layer is an anode layer, and the second electrode layer is a cathode layer;

[0023] The second electrode layer is reused as a reference electrode layer of the light-shielding sub-unit.

[0024] Optionally, the film layers of the light-emitting chip are arranged in such a manner that the driving layer, the first electrode layer, the inorganic electroluminescent layer, the second electrode layer, the filter layer and the light-shielding layer are stacked in sequence;

[0025] Alternatively, the driving layer, the first electrode layer, the inorganic electroluminescent layer, the second electrode layer, the light shielding layer and the filter layer are stacked in sequence.

[0026] According to another aspect of the present invention, there is provided a display panel, comprising: a plurality of light-emitting chips of the display panel according to any embodiment of the present invention.

[0027] Optionally, the display panel further includes:

[0028] A PCB backplane, wherein a plurality of the light-emitting chips are arranged in an array on the PCB backplane and are connected to the PCB backplane via the driving layer.

[0029] Optionally, the display panel further includes:

[0030] A metal back plate, the metal back plate is arranged on a side of the PCB back plate away from the light-emitting chip, and the metal back plate includes a side wall located at an edge;

[0031] A glass protection plate is arranged on a side of the light emitting chip away from the metal back plate, and an edge of the glass protection plate overlaps a side wall of the metal back plate.

[0032] According to another aspect of the present invention, there is provided a display device, comprising: the display panel according to any embodiment of the present invention.

[0033] In the technical solution provided by the embodiment of the present invention, the inorganic electroluminescent layer adopts an electroluminescent long afterglow luminescent film, so that the light-emitting chip has better luminous performance and longer life, and reduces the color deviation caused by the loss of the luminescent material. And the light-emitting chip does not need to be provided with a separate backlight source and a liquid crystal display screen, the power consumption is low, and the production and manufacturing process is simple. Furthermore, by controlling the shading layer through the driving layer in the light-emitting chip, the light-emitting state of the light-emitting chip is switched, which has good controllability. In summary, the embodiment of the present invention solves the problems of low life and easy color deviation of the display panel, and has low power consumption and is easy to prepare.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 is a structural schematic diagram of a light-emitting chip provided according to an embodiment of the present invention;

[0037] Figure 2 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of an expanded light shielding subunit of a light emitting chip provided according to an embodiment of the present invention;

[0039] Figure 4 is a schematic diagram of a shrinkage of a light shielding subunit of a light emitting chip provided in an embodiment of the present invention;

[0040] Figure 5 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0041] Figure 6 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0042] Figure 7 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0043] Figure 8 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0044] Fig. 9 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0045] Fig.10 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0046] Fig.11 is a schematic diagram of a light-emitting mechanism of an inorganic electroluminescent layer provided according to an embodiment of the present invention;

[0047] Fig.12 is a schematic diagram of the molecular relationship of a luminescent material of an inorganic electroluminescent layer provided according to an embodiment of the present invention;

[0048] Fig.13 is a schematic structural diagram of another light-emitting chip provided according to an embodiment of the present invention;

[0049] Fig.14 is a schematic diagram of the arrangement of light-emitting chips of a display panel provided according to an embodiment of the present invention;

[0050] Fig.15 is a schematic cross-sectional view of a display panel along the AA' direction provided according to an embodiment of the present invention;

[0051] Fig.16 is a schematic cross-sectional view of another display panel along the AA' direction provided according to an embodiment of the present invention;

[0052] Fig.17 is a schematic diagram of the back of a display panel provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] An embodiment of the present invention provides a light-emitting chip of a display panel. Figure 1 This is a schematic diagram of the structure of a light-emitting chip provided by an embodiment of the present invention. Figure 1 The light-emitting chip includes: a driving layer 1, a first electrode layer 2, an inorganic electroluminescent layer 3, a second electrode layer 4, a light shielding layer 5 and a filter layer 6. The inorganic electroluminescent layer 3 is powered by the first electrode layer 2 and the second electrode layer 4, and emits light in response to the driving current generated by the first electrode layer 2 and the second electrode layer 4. The filter layer 6 can convert the color of the light emitted by the inorganic electroluminescent layer 3. The light shielding layer 5 is electrically connected to the driving layer 1; the driving layer 1 can control the light shielding layer 5 to expand or retract, so as to control whether the light shielding layer 5 blocks the light emitted by the inorganic electroluminescent layer 3.

[0056] Among them, the inorganic electroluminescent layer 3 can also be called an electroluminescent long afterglow luminescent film, which is composed of inorganic semiconductor materials. These materials can produce luminescence under the action of the electric field of the first electrode layer 2 and the second electrode layer 4, and can continue to emit light and maintain a certain period of time after power is cut off. Specifically, the inorganic electroluminescent layer 3 (or electroluminescent long afterglow luminescent film) uses phosphorescent materials, which are a special type of luminescent material that can continue to emit light for a period of time after the excitation source is removed. The luminescence principle of this material is related to its unique energy level structure and defect state.

[0057] For example, the phosphorescent material can be a polycyclic aromatic hydrocarbon dimer fused with boron, nitrogen and oxygen. There is a strong π-π interaction between the dimers. This interaction increases the degree of overlap of the electron clouds between molecules, which is beneficial to the transfer of electrons and the stability of the excited state. Strong π-π interactions can inhibit non-radiative transition processes, that is, reduce the probability of dissipation of excited state energy in non-luminescent forms (such as heat energy, etc.), thereby promoting fluorescent emission.

[0058] In the electroluminescent long afterglow film, there may be some trap states, which can capture excited electrons or holes and delay their recombination process. After being excited, electrons can be captured by trap states, which can be generated by impurity ions or defects in the matrix. When the excitation stops, the electrons captured by the trap state can be released under certain conditions (such as thermal excitation, etc.), so that the electrons escape from the trap state under the action of thermal disturbance, recombine with holes in the valence band, and then return to the singlet state through the RISC (Reverse Inter System Crossing) process to produce luminescence and increase the duration of the afterglow. This process can last from seconds to hours, depending on the depth and number of trap states.

[0059] Exemplarily, the light-emitting principle of the light-emitting chip is that the brightness of the light emitted by the inorganic electroluminescent layer 3 can be adjusted by the voltage or current provided by the first electrode layer 2 and the second electrode layer 4. At the same time, the light-emitting chip can be controlled to display a black screen or a color screen by setting the expansion or retraction of the light-shielding layer 5. Specifically, the inorganic electroluminescent layer can still maintain the display effect for a period of time after the first electrode layer 2 and the second electrode layer 4 are powered off, which can effectively reduce the light-emitting power consumption of the light-emitting chip. In some cases, when the light-emitting chip is required to display a black screen after the first electrode layer 2 and the second electrode layer 4 are powered off, the light-emitting layer 3 can be shielded by expanding the light-shielding layer 5. At this time, the driving layer 1 controls the light-shielding layer 5 to expand, and the expanded light-shielding layer 5 can completely cover the inorganic electroluminescent layer 3, and the light emitted by the inorganic electroluminescent layer 3 cannot pass through the light-shielding layer 5, so that the light emitted by the inorganic electroluminescent layer 3 cannot be emitted by the light-emitting chip. It can be understood that when the light emitting chip displays normally, the driving layer 1 controls the light shielding layer 5 to retract, so that the light emitted by the inorganic electroluminescent layer 3 can be emitted through the light emitting chip.

[0060] The embodiment of the present invention adopts an inorganic electroluminescent layer 3 as a light source, while the organic matter constituting the traditional organic light-emitting device will continuously produce losses when emitting light. Therefore, compared with the traditional organic light-emitting device, the inorganic electroluminescent layer 3 has a longer lifespan and can still maintain a good state after a long period of operation, which is beneficial to avoid the problem of color accuracy deviation caused by the loss of organic matter. Because the inorganic electroluminescent layer 3 can directly emit light when powered on, compared with the LCD display panel, the embodiment of the present invention does not need to separately set up a liquid crystal display screen and a backlight source, so there is no need to separately power the liquid crystal display screen and the backlight source, thereby reducing power consumption. Furthermore, it can also simplify the production process. In summary, the embodiment of the present invention is beneficial to improving the display problems existing in the existing display panels.

[0061] In the above embodiments, there are many ways to dispose the inorganic electroluminescent layer 3, which will be described in detail below, but are not intended to limit the present invention.

[0062] In one embodiment, optionally, the electroluminescent long afterglow luminescent film is a rare earth long afterglow luminescent film.

[0063] Among them, the electroluminescent long afterglow luminescent film is a film material that can produce long afterglow luminescence phenomenon under the action of an electric field. The rare earth long afterglow luminescent film is an inorganic material doped with rare earth elements, for example, it can be made of micron-sized rare earth phosphors to achieve long afterglow performance.

[0064] In another embodiment, the electroluminescent long afterglow luminescent film is optionally an inorganic long afterglow luminescent film, wherein the inorganic long afterglow luminescent film is made of materials such as sulfide, aluminate and silicate, and achieves long afterglow performance through electron capture and release.

[0065] In another embodiment, the electroluminescent long afterglow luminescent film is optionally a super afterglow polymer film, wherein the super afterglow polymer film is made of polymer and can achieve high-efficiency narrow-band afterglow emission.

[0066] The embodiments of the present invention adopt rare earth long afterglow luminescent film, inorganic long afterglow luminescent film or super afterglow polymer film, which can not only reduce the energy consumption of the light-emitting chip, improve the contrast and clarity of the display, and maintain light emission for a certain period of time after power failure, but also help to reduce production costs and facilitate implementation.

[0067] In the above embodiments, there are many ways to set the light shielding layer 5, which will be described in detail below, but are not intended to limit the present invention.

[0068] In one embodiment, optionally, the shading layer 5 is an electrothermal ultra-fiber micro-sheet shading layer.

[0069] Among them, the electric heating ultra-fiber micro-sheet shading layer can be formed by combining carbon fiber and silicone rubber, and has good strength and toughness.

[0070] In another embodiment, optionally, the light-shielding layer 5 is a liquid crystal elastomer light-shielding layer.

[0071] Among them, the liquid crystal elastomer shading layer can be composed of a combination of liquid crystal monomers, cross-linking agents and additives. The liquid crystal monomers are the basic units that constitute the liquid crystal elastomer skeleton. The liquid crystal monomer molecules are connected by chemical bonds through cross-linking agents, and the mechanical strength, response speed and other properties of the liquid crystal elastomer are improved by additives.

[0072] The electric heating ultra-fiber micro-sheet shading layer and the liquid crystal elastic body shading layer adopted in the embodiment of the invention can be controlled by the driving layer 1 to rapidly expand or retract themselves, so as to realize the light emission control of the light-emitting chip.

[0073] In the technical solution provided by the embodiment of the present invention, the inorganic electroluminescent layer 3 adopts an electroluminescent long afterglow luminescent film, so that the light-emitting chip has better luminous performance and longer life, and reduces the color deviation caused by the loss of the luminescent material. And the light-emitting chip does not need to be provided with a separate backlight source and a liquid crystal display screen, the power consumption is low, and the production and manufacturing process is simple. Furthermore, through the control of the light-shielding layer 5 by the driving layer 1 in the light-emitting chip, the switching of the light-emitting state of the light-emitting chip is realized, and it has good controllability. In summary, the embodiment of the present invention solves the problems of low life and easy color deviation of the display panel, and has low power consumption and is easy to prepare.

[0074] Figure 2 This is a schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Figure 2 On the basis of the above embodiments, optionally, the filter layer 6 comprises: a glass substrate 61, and filter monomers 62 of different colors arranged on the glass substrate 61; the filter monomers 62 can convert the light emitted by the inorganic electroluminescent layer 3 into different colors. The light shielding layer 5 comprises: a plurality of light shielding sub-units 51, and the light shielding sub-units 51 are arranged in a one-to-one correspondence with the filter monomers 62, so that the light shielding sub-units 51 can shield the light emitted from the inorganic electroluminescent layer 3 corresponding to the filter monomer 51 area when unfolded.

[0075] The filter monomers 62 can function as filters, and the shapes and sizes of the filter monomers 62 can be the same or different, and can be specifically configured according to different pixel arrangements. For example, the filter monomers 62 can be disposed on the glass substrate 61 by etching and then evaporated and colored.

[0076] The light shielding sub-units 51 are arranged in a one-to-one correspondence with the light filtering monomers 62 , so that when the light shielding sub-units 51 are unfolded, the light transmitted through the light filtering monomers 62 by the inorganic electroluminescent layer 3 can be shielded.

[0077] Optionally, the shading subunit 51 has two states, namely, expansion and retraction, and is controlled by the driving layer 1; when the shading subunit 51 is expanded, the corresponding filter monomer 62 is in a dark state. For example, when the inorganic electroluminescent layer 3 loses power, due to the afterglow characteristics of the inorganic electroluminescent layer 3, the inorganic electroluminescent layer 3 will continue to emit light for a certain period of time. By controlling the expansion or retraction of the shading subunit 51, the light emission of each filter monomer 62 can be controlled. When the shading subunit 51 is expanded, the corresponding filter monomer 62 is in a dark state, thereby ensuring that the light-emitting chip will not continue to emit light when it is turned off.

[0078] On the basis of the above embodiments, optionally, the orthographic projection of the light shielding subunit on the driving layer in the fully expanded state coincides with the orthographic projection of the light filter monomer on the driving layer. In order to ensure the light shielding effect of the light shielding subunit, the light filter monomer and the light shielding subunit are the same size at the same position above and below the light emitting chip. When the light shielding subunit is expanded, the light filter monomer at the same position can be completely covered, so that the light of the inorganic electroluminescent layer that passes through the light filter monomer can be completely blocked by the light shielding subunit at this position.

[0079] Continue to refer Figure 2 On the basis of the above embodiments, optionally, the filter monomer 62 includes at least two of a red filter monomer 621, a green filter monomer 622, a blue filter monomer 623 and a white filter monomer (not shown in the figure).

[0080] Among them, the red filter monomer 621 can selectively transmit red light, the green filter monomer 622 can selectively transmit green light, the blue filter monomer 623 can selectively transmit blue light, and the white filter monomer can selectively transmit white light. By arranging the red filter monomer 621, the green filter monomer 622, the blue filter monomer 623 and the white filter monomer, the light emitted by the inorganic electroluminescent layer 3 can be converted into colored light.

[0081] Exemplarily, the pixel arrangement is an RGB arrangement, and a red filter monomer 621, a green filter monomer 622 and a blue filter monomer 623 constitute a pixel. The size of the light-emitting chip can be set according to actual needs. Specifically, a light-emitting chip can include 8×16 filter monomers, that is, a light-emitting chip can include 8×16 sub-pixels. In one embodiment, 8×16 sub-pixels share an inorganic electroluminescent layer 3, so that all sub-pixels in the light-emitting chip have the same light output brightness. After the light-emitting chip is assembled on the display panel, a large number of light-emitting chips are usually arranged in a display panel. A light-emitting chip can be regarded as a light-emitting control unit. By adjusting the light output brightness of each light-emitting chip, dynamic display of the display panel is achieved.

[0082] In another embodiment, the inorganic electroluminescent layer 3 includes a plurality of light-emitting units, one light-emitting unit corresponds to one sub-pixel, and the brightness of each light-emitting unit is adjusted by the driving layer respectively, so that the light-emitting chip can control the light output brightness of each sub-pixel respectively.

[0083] In the above embodiments, when the display panel is displaying, in order to achieve a more refined display effect, some sub-pixels need to be displayed as black under the characteristic display screen, but due to the afterglow characteristics of the inorganic electroluminescent layer 3, each sub-pixel cannot immediately display black. The embodiment of the present invention can control the expansion or contraction of the light shielding layer 5 to compensate for the display problem caused by the afterglow effect of the inorganic electroluminescent layer 3, thereby ensuring the display effect of the display panel.

[0084] Figure 3 The following is a schematic diagram of an expanded light shielding subunit of a light emitting chip provided by an embodiment of the present invention. Figure 4 A schematic diagram of a light shielding subunit of a light emitting chip provided by an embodiment of the present invention is shown in FIG. Figure 3 and Figure 4 On the basis of the above embodiments, optionally, the shading sub-unit 51 includes a first power supply node 512 , and the first power supply node 512 is connected to the driving layer 1 ; the driving layer 1 can control the unfolding state of each shading sub-unit 51 .

[0085] The control signal output by the driving layer 1 is input into the shading subunit 51 through the first power supply node 512. Exemplarily, when the shading subunit 51 is powered on, the shading subunit 51 retracts toward the first power supply node 512, so that the light emitted by the inorganic electroluminescent layer 3 is not blocked by the shading subunit 51. When the shading subunit 51 is powered off, the shading subunit 51 is expanded, so that the light emitted by the inorganic electroluminescent layer 3 is blocked by the shading subunit 51. Exemplarily, when the expanded size of the shading subunit 51 is 0.1*0.2um, the retracted size of the shading subunit 51 can be 0.01*0.2um.

[0086] The first power supply node 512 is provided with a second power supply node 513 at a symmetrical position of the light shielding subunit 51. The second power supply node 513 can be used as a backup node for the first power supply node 512. In a normal state, the second power supply node 513 is in a floating state and is not connected. When the first power supply node 512 fails, the second power supply node 513 can replace the first power supply node 512 to connect to the driving layer 1. At this time, when the light shielding subunit 51 is powered on, the light shielding subunit 51 can retract to the position of the second power supply node 513.

[0087] Continue to combine Figure 3 and Figure 4 On the basis of the above embodiments, optionally, the first power supply node 512 is an anode node, the first electrode layer 2 is an anode layer, and the second electrode layer 4 is a cathode layer. The second electrode layer 4 is multiplexed as a reference electrode layer of the light shielding subunit 51 .

[0088] The driving layer 1 can be used to transmit electrical energy to the anode layer and the cathode layer. A hole transport layer can be provided between the anode layer and the inorganic electroluminescent layer 3, so that holes can be transported between the inorganic electroluminescent layer 3 and the anode layer. An electron transport layer can be provided between the cathode layer and the inorganic electroluminescent layer 3, so that electrons can be transported between the inorganic electroluminescent layer 3 and the cathode layer. In this way, the inorganic electroluminescent layer 3 can be powered and emit light.

[0089] The light-shielding subunit 51 can share a cathode layer with the inorganic electroluminescent layer 3 . The light-shielding subunit 51 can form an electrical circuit between the anode node and the cathode layer, thereby enabling the driving layer 1 to control the light-shielding subunit 51 .

[0090] The above embodiments exemplarily show that the shading sub-units in the light-emitting chip are simultaneously expanded under the control of the driving layer 1 to control the light-emitting chip not to emit light, or the shading sub-units are simultaneously retracted to control the light-emitting chip to emit light. In other embodiments, the shading sub-units in the light-emitting chip can also be independently controlled to achieve partial light emission of the light-emitting chip, which is described in detail below.

[0091] Figure 5 This is a schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Figure 5 On the basis of the above embodiments, optionally, the driving layer 1 includes a plurality of driving circuits 11, and the plurality of driving circuits 11 are arranged in one-to-one correspondence with the plurality of shading sub-units 51; each driving circuit 11 is used to control the unfolding state of each shading sub-unit 51 respectively.

[0092] Among them, a plurality of driving circuits 11 corresponding to the plurality of shading sub-units 51 are arranged on the driving layer 1, which is conducive to individually controlling the shading sub-units 51, and then individually controlling the luminous brightness of each sub-pixel. Optionally, the shading sub-unit has two states of expansion and retraction, and the driving circuit is used to control the expansion or retraction of the shading sub-unit. In some cases, the shading sub-unit 51 corresponding to the red filter monomer can be controlled to expand, the shading sub-unit 51 corresponding to the green filter monomer can be controlled to retract, and the shading sub-unit 51 corresponding to the blue filter monomer can be controlled to retract, so that the red filter monomer does not emit light, and the green filter monomer and the blue filter monomer emit light. By controlling the shading sub-unit 51 corresponding to the red filter monomer to retract, the shading sub-unit 51 corresponding to the green filter monomer to expand, and the shading sub-unit 51 corresponding to the blue filter monomer to retract, it is achieved that the green filter monomer does not emit light, and the red filter monomer and the blue filter monomer emit light. By controlling the shading subunit 51 corresponding to the red filter monomer to retract, the shading subunit 51 corresponding to the green filter monomer to expand, and the shading subunit 51 corresponding to the blue filter monomer to expand, the blue filter monomer and the green filter monomer do not emit light, while the red filter monomer emits light.

[0093] Through this arrangement, each shading sub-unit 51 can be controlled more precisely, thereby improving the fineness of the display of the light-emitting chip and achieving a better display effect.

[0094] Figure 6 A schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Figure 5 and Figure 6 On the basis of the above embodiments, optionally, the shading sub-unit 51 has different extension degrees; the driving circuit 11 is also used to control the expansion area of ​​the shading sub-unit 51; wherein the expansion area of ​​the shading sub-unit 51 is used to adjust the light output brightness of the corresponding filter monomer 52.

[0095] Among them, different shading sub-units 51 have different extension degrees, which can achieve more precise adjustment of the luminous brightness of the sub-pixel through the shading sub-unit. For example, by controlling the shading sub-unit 51 corresponding to the red filter monomer to be fully extended, the sub-pixel is in a dark state, that is, 0 grayscale; by controlling the shading sub-unit 51 corresponding to the red filter monomer to be partially extended, the sub-pixel displays the corresponding grayscale; by controlling the shading sub-unit 51 corresponding to the red filter monomer to be fully retracted, the sub-pixel is in a bright state, that is, the maximum grayscale; by controlling the shading sub-unit 51 corresponding to the green filter monomer to be fully extended, the sub-pixel is in a dark state, that is, 0 grayscale; by controlling the shading sub-unit 51 corresponding to the green filter monomer to be partially extended, the sub-pixel displays the corresponding grayscale; The unit 51 is partially expanded, and the sub-pixel displays the corresponding grayscale; by controlling the shading sub-unit 51 corresponding to the green filter monomer to be completely retracted, the sub-pixel is in a bright state, that is, the maximum grayscale; by controlling the shading sub-unit 51 corresponding to the blue filter monomer to be completely expanded, the sub-pixel is in a dark state, that is, 0 grayscale; by controlling the shading sub-unit 51 corresponding to the blue filter monomer to be partially expanded, the sub-pixel displays the corresponding grayscale; by controlling the shading sub-unit 51 corresponding to the blue filter monomer to be completely retracted, the sub-pixel is in a bright state, that is, the maximum grayscale.

[0096] Further, at least two filter monomers 62 of different colors constitute a display pixel 602. By controlling the extension degree of the shading subunit 51 corresponding to the red filter monomer, the green filter monomer and the blue filter monomer in a pixel respectively, the mixed color display of the pixel can be adjusted. By controlling the shading subunit 51 corresponding to the red filter monomer to be fully extended, partially extended or fully retracted, the corresponding red sub-pixel can display different grayscales; controlling the shading subunit 51 corresponding to the green filter monomer to be fully extended, partially extended or retracted, the corresponding green sub-pixel can display different grayscales; and controlling the shading subunit 51 corresponding to the blue filter monomer to be fully extended, partially extended or fully retracted, the corresponding blue sub-pixel can display different grayscales. The mixed colors of the red sub-pixel, the green sub-pixel and the blue sub-pixel at different grayscales can produce more display chromaticity and display brightness, which is conducive to making the display effect of the light-emitting chip better and more delicate.

[0097] Figure 7 This is a schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Figure 7 In another embodiment, the shading subunit 51 is optionally arranged in a one-to-one correspondence with the display pixel 602, so that the shading subunit 51 can block the light emitted from the area of ​​the inorganic electroluminescent layer 3 corresponding to the display pixel 602 when it is expanded. Exemplarily, the red filter monomer 621, the green filter monomer 622 and the blue filter monomer 623 constitute the display pixel 602. For example, by controlling the shading subunit 51 corresponding to a display pixel 602 to be fully expanded, the display pixel 602 is in a dark state, that is, 0 grayscale; by controlling the shading subunit 51 corresponding to a display pixel 602 to be partially expanded, the display pixel 602 is in a corresponding grayscale; by controlling the shading subunit 51 corresponding to a display pixel 602 to be fully retracted, the display pixel 602 is in a bright state, that is, the maximum grayscale. Such a setting is conducive to taking into account both the display effect and cost control of the light-emitting chip.

[0098] Figure 8 This is a schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Figure 8 On the basis of the above embodiments, the inorganic electroluminescent layer 3 optionally includes a plurality of light-emitting subunits 31, and the light-emitting subunits 31 are arranged in one-to-one correspondence with the light-filtering monomers 62. In this way, the brightness of the light-emitting subunits 31 can be adjusted separately, so that the light output of each light-filtering monomer 62 can be independently controlled, so that the light output control of the light-emitting chip is more flexible and has a better light-emitting effect. The brightness control method of each light-emitting subunit 31 is similar to the control method of the aforementioned light-shielding subunit 51, and will not be repeated.

[0099] Furthermore, the control method of the light-emitting subunit 31 adjusts the light-emitting brightness of the light-emitting layer material, and does not block the light-emitting subunit 31, while the control method of the light-shielding subunit 51 blocks the light-emitting subunit 31. Therefore, the brightness adjustment by controlling the light-emitting subunit 31 is conducive to improving the aperture ratio of the light-emitting chip.

[0100] It should be noted that, since the light-emitting layer of the present invention adopts an inorganic electroluminescent layer, which has afterglow characteristics, no matter whether the brightness is adjusted by controlling the light-emitting subunit 31, a light-shielding layer needs to be provided to shield the afterglow.

[0101] Fig. 9 This is a schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Fig. 9 In another embodiment, the light-emitting subunits 31 are arranged in one-to-one correspondence with the display pixels 602. For example, the red filter monomer 621, the green filter monomer 622 and the blue filter monomer 623 constitute the display pixel 602. For example, by controlling the light-emitting subunit 31 corresponding to a display pixel 602 to display a certain gray scale, the display pixel 602 is made to be the corresponding gray scale. Such an arrangement is conducive to taking into account both the display effect and cost control of the light-emitting chip.

[0102] Continue to see Figure 7-Figure 9 On the basis of the above embodiments, the arrangement of the film layers of the light-emitting chip is as follows: the driving layer 1, the first electrode layer 2, the inorganic electroluminescent layer 3, the second electrode layer 4, the filter layer 5 and the light shielding layer 6 are stacked in sequence. It should be noted that this structure is used as an example in the embodiments of the present invention, which is not a limitation of the present invention. In other embodiments, the order of the film layers of the light-emitting chip can also be adjusted. For example, the order of the filter layer 5 and the light shielding layer 6 is adjusted. For example, refer to Fig.10 The arrangement of the film layers of the light-emitting chip is as follows: a driving layer 1, a first electrode layer 2, an inorganic electroluminescent layer 3, a second electrode layer 4, a light shielding layer 6 and a filter layer 5 are stacked in sequence.

[0103] Furthermore, in order to more clearly illustrate the light-emitting principle of the inorganic electroluminescent layer, a specific description is given below. Fig.11 A schematic diagram of the light-emitting mechanism of an inorganic electroluminescent layer provided in an embodiment of the present invention. Fig.11 Optionally, the luminescence process of the inorganic electroluminescent layer includes fluorescence F, non-radiative transition NR, intersystem crossing ISC, reverse intersystem crossing RISC, internal conversion IC, thermally activated delayed fluorescence TADF, and exciton dissociation Diss through host-guest charge transfer interaction.

[0104] The luminescent material of the inorganic electroluminescent layer can be named BO-NO. The BO-NO monomer has a large △EST due to the large transition orbital overlap integral and can be classified as a conventional fluorescent emitter. The larger conjugated plane and lower charge density in the BO-NO molecule are conducive to the formation of dimers with strong pp interactions. When the doping concentration increases, the absorption and emission spectra show obvious red shifts, and the fluorescence lifetime is prolonged, indicating that the emission comes from the BO-NO dimer state. In the tightly stacked molecular dimer state, the intermolecular interaction can suppress the non-radiative transition. In addition, the TDM of the molecular dimer forms a special J-aggregation arrangement, which is conducive to fluorescence emission. Therefore, dimer emission with high PLQY can be obtained, which is different from the ACQ effect. At relatively low doping concentrations, the formation of dimers has a greater effect on the singlet energy level, but less on the triplet energy level. The significant reduction of the singlet energy level can reduce △EST and trigger the slow TADF path in the photodynamic process. In addition, a high-gap LE triplet state with a strong SOC effect is found in the dimer, which can serve as an intermediate state for triplet exciton upconversion. In the BO-NO dimer with a doping concentration of 10wt%, the moderate △EST suppresses the non-radiative transition, and the good triplet exciton confinement in the host matrix makes the RISC process slow. After excitation, the long-lived triplet excitons can be upconverted to the singlet state to emit a long-lived afterglow TADF. In the light-emitting chip, the 10wt% BO-NO-based device showed obvious TADF afterglow with a lifetime of up to 157 milliseconds after the pulse voltage was turned off. The device also exhibited high efficiency (14.7%) and maximum brightness (17,020cdm), indicating that the triplet excitons contribute to the luminescence. Note that under the luminescence condition, 75% of the excitons are triplet excitons, so a more obvious afterglow phenomenon can be observed in the luminescence compared with the photoluminescence condition, while for the undoped light-emitting chip, due to the significant orbital overlap, the triplet excitons will be quenched by TTA, and only fluorescence can be observed, resulting in a good EQE (3.99%) for the light-emitting chip. In addition, it was found that the TADF afterglow characteristics were affected by the host-guest CT state. On the one hand, the host-guest CT states can promote the ISC / RISC process, produce more delayed components and shorten the TADF lifetime. On the other hand, the host-guest charge transfer interaction may be the driving force for charge separation, which allows the dissociation of excitons into free carriers and subsequent slow recombination, thereby enhancing the afterglow under reverse bias. The 10 wt% BO-NO:PPF system with optimized host-guest charge transfer interaction is able to achieve a balance between the afterglow TADF component and the long lifetime, resulting in a light-emitting chip with efficient dimers with afterglow emission.

[0105] Fig.12 A schematic diagram of the molecular relationship of an inorganic electroluminescent layer luminescent material provided by an embodiment of the present invention. Fig.12 Alternatively, due to the large p-conjugated plane of BO-NO molecules and the reduced electron density of the central skeleton due to heteroatom fusion, BO-NO molecules are stacked with short molecular distances and a slightly tilted configuration (67.15° away from the center of mass), forming a fishbone stacking pattern. The intermolecular face-to-face dπ-π distance is estimated to be 3.45 Å, which is in good agreement with the GIWAXS spectrum of the pure film. In addition, the 1.3, 0.75, and 0.4 Å of BO-NO stacking -1 The q values ​​of can be attributed to the face-edge dimer, short axis and long axis, respectively, indicating the existence of strong pp stacking similar to single crystal in the amorphous non-doped film. Similarly, the GIWAXS spectrum of the 10 wt% doped DPEPO film also shows 3.52A (at q = 1.78A). -1 ). The independent gradient model based on the Hirshfield partition (IGMH) method can intuitively present the strong π-π interaction of the face-to-face dimer, in which the intermolecular van der Waals interaction dominates the intermolecular interaction. This strong interaction may lead to the extension of molecular conjugation and the suppression of molecular vibration, resulting in the red shift of the dimer emission and high photoluminescence quantum yield.

[0106] Fig.13 This is a schematic diagram of the structure of another light-emitting chip provided by an embodiment of the present invention. Fig.13 Optionally, the light emitting chip includes: a first electrode layer 2, an inorganic electroluminescent layer 3 and a second electrode layer 4. The first electrode layer 2 may be an anode layer, and the second electrode layer 4 may be a cathode layer.

[0107] Exemplarily, the material of the first electrode layer 2 may be ITO (Indium Tin Oxide), and the material of the second electrode layer 4 may be AL (Aluminum). An electron transport layer (ETL) 41 may be provided between the first electrode layer 2 and the inorganic electroluminescent layer 3, and a hole transport layer (HTL) 21 may be provided between the second electrode layer 4 and the inorganic electroluminescent layer 3. By this arrangement, a light-emitting chip with an efficient dimer having afterglow emission can be formed. An efficient light-emitting chip having both high efficiency and long afterglow emission is realized, and the light-emitting chip has the characteristics of high photoluminescence quantum yield and long-life thermally activated delayed fluorescence.

[0108] The embodiment of the present invention further provides a display panel, which includes: a plurality of light-emitting chips of the display panel provided by any embodiment of the present invention, and has corresponding beneficial effects.

[0109] Among them, the display panel is composed of a plurality of light-emitting chips. During the manufacture or use of the display panel, when a problem or failure occurs in a certain light-emitting chip, the light-emitting chip can be replaced to complete the maintenance of the entire display panel, and the entire display panel will not be scrapped. Therefore, the display panel has good replaceability. The technical solution provided in the embodiment of the present invention avoids the problem of the entire panel being scrapped due to complex processes during the processing or manufacturing of the display panel by setting a setting method in which a plurality of light-emitting chips are combined into a display panel, and has good replaceability and maintainability.

[0110] Fig.14 A schematic diagram of the arrangement of light-emitting chips of a display panel provided by an embodiment of the present invention. Fig.15 A cross-sectional schematic diagram of a display panel along the AA' direction provided by an embodiment of the present invention. Fig.14 and Fig.15 On the basis of the above embodiments, optionally, the display panel further includes: a PCB backplane 7, a plurality of light emitting chips 10 are arranged in an array on the PCB backplane 7, and are connected to the PCB backplane 7 through a driving layer 1.

[0111] Exemplarily, the bottom of the driving layer 1 of the light emitting chip 10 is provided with conductive points, and the PCB backplane 7 is connected to each conductive point. The PCB backplane 7 can be provided with a control chip, which can be a timing control chip (T-con). By writing a specific code or program into the control chip, each light emitting chip 10 can be individually controlled. The light emitting chips 10 can be arranged in a matrix to form the entire display panel.

[0112] For example, by controlling the energization of the light shielding subunit 51 in one of the light emitting chips 10, the light shielding subunit 51 can be retracted so that light can be output by the light emitting chip 10. Otherwise, light cannot be output by the light emitting chip 10, and the screen is in a dark state.

[0113] When light can be output by the light emitting chip 10 , the light can be converted into colored light through the red filter monomer 621 , the green filter monomer 622 and the blue filter monomer 623 , and then the light output of the light emitting chip 10 can be adjusted through the control of the driving layer 1 .

[0114] Fig.16 A schematic cross-sectional view of another display panel along the AA' direction provided by an embodiment of the present invention, Fig.17 A schematic diagram of the back of a display panel provided by an embodiment of the present invention. Fig.16 and Fig.17On the basis of the above embodiments, optionally, the display panel further comprises: a metal back plate 8 and a glass protection plate 9. The metal back plate 8 is arranged on the side of the PCB back plate 7 away from the light emitting chip 10, and the metal back plate 8 comprises a side wall located at the edge. The edge of the glass protection plate 9 overlaps the side wall of the metal back plate 8 and is arranged on the side of the light emitting chip 10 away from the metal back plate 8.

[0115] Among them, the metal back plate 8 is used to support the PCB back plate 7, and wrap the light-emitting chip 10 placed in the PCB back plate 7 through the side wall. The glass protection plate 9 is attached to the filter layer 6, which can protect the light output of each light-emitting chip 10 without affecting the display effect.

[0116] Optionally, the display panel further includes a control chip 71, which may be a timing control chip (T-con). There may be multiple control chips 71, all of which are disposed on the back of the PCB back plate 7. At the location where the control chip 71 is disposed, the metal back plate 8 may be provided with a hole to avoid the location of the control chip 71. The number of control chips 71 may be increased as the number of light-emitting chips 10 increases, and the arrangement of multiple control chips 71 may speed up the control speed of the light-emitting chips 10.

[0117] An embodiment of the present invention further provides a display device, comprising: a display panel provided by any embodiment of the present invention, which has similar beneficial effects as the display panel provided by any of the above embodiments, and will not be described in detail herein.

[0118] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0119] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A light-emitting chip for a display panel, characterized in that: The light-emitting chip comprises: a driving layer, a first electrode layer, an inorganic electroluminescent layer, a second electrode layer, a light shielding layer and a light filtering layer; The inorganic electroluminescent layer is powered by the first electrode layer and the second electrode layer, and emits light in response to a driving current generated by the first electrode layer and the second electrode layer; The filter layer can convert the color of the light emitted by the inorganic electroluminescent layer; The light shielding layer is electrically connected to the driving layer; the driving layer can control the light shielding layer to expand or retract, so as to control whether the light shielding layer blocks the light emitted by the inorganic electroluminescent layer.

2. The light emitting chip of the display panel according to claim 1, characterized in that: The inorganic electroluminescent layer includes: a rare earth long afterglow luminescent film, an inorganic long afterglow luminescent film or a super afterglow polymerized film; And / or, the shading layer includes: an electrothermal ultra-fiber micro-sheet shading layer or a liquid crystal elastomer shading layer.

3. The light emitting chip of the display panel according to claim 1, characterized in that: The filter layer comprises: a glass substrate, and filter monomers of different colors arranged on the glass substrate; the filter monomers can convert the light emitted by the inorganic electroluminescent layer into different colors; wherein at least two filter monomers of different colors constitute a display pixel; The light shielding layer comprises: a plurality of light shielding sub-units, the light shielding sub-units are arranged in one-to-one correspondence with the light filter monomers, so that the light shielding sub-units can shield the light emitted from the inorganic electroluminescent layer corresponding to the light filter monomer area or the display pixel area when unfolded; And / or, the inorganic electroluminescent layer comprises: a plurality of light-emitting sub-units, and the light-emitting sub-units are arranged in one-to-one correspondence with the light-filtering monomers.

4. The light emitting chip of the display panel according to claim 3, characterized in that: The orthographic projection of the light shielding sub-unit on the driving layer in a fully unfolded state coincides with the orthographic projection of the light filtering monomer on the driving layer.

5. The light emitting chip of the display panel according to claim 3, characterized in that: The shading sub-unit includes a first power supply node, and the first power supply node is connected to the driving layer; the driving layer can control the unfolding state of each of the shading sub-units; Wherein, the first power supply node is an anode node, the first electrode layer is an anode layer, and the second electrode layer is a cathode layer; The second electrode layer is reused as a reference electrode layer of the light-shielding sub-unit.

6. The light emitting chip of the display panel according to claim 3, characterized in that: The driving layer includes a plurality of driving circuits, and the plurality of driving circuits are arranged in a one-to-one correspondence with the plurality of light-shielding sub-units; each of the driving circuits is used to control the unfolding state of each of the light-shielding sub-units respectively.

7. The light emitting chip of the display panel according to claim 6, characterized in that: The shading sub-units have different extension degrees; the driving circuit is also used to control the extension area of ​​the shading sub-units; wherein the extension area of ​​the shading sub-units is used to adjust the light output brightness corresponding to the filter monomer; And / or, the shading sub-unit has two states: expanded and retracted; the driving circuit is also used to control the expansion or retraction of the shading sub-unit; wherein, when the shading sub-unit is expanded, the corresponding filter monomer is in a dark state.

8. The light emitting chip of the display panel according to claim 1, characterized in that: The arrangement of the film layers of the light-emitting chip is as follows: the driving layer, the first electrode layer, the inorganic electroluminescent layer, the second electrode layer, the filter layer and the light shielding layer are stacked in sequence; Alternatively, the driving layer, the first electrode layer, the inorganic electroluminescent layer, the second electrode layer, the light shielding layer and the filter layer are stacked in sequence.

9. A display panel, characterized in that: include: A plurality of light-emitting chips for a display panel according to any one of claims 1 to 8; The display panel further includes: A PCB backplane, on which a plurality of the light-emitting chips are arranged in an array and connected to the PCB backplane through the driving layer; A metal back plate, the metal back plate is arranged on a side of the PCB back plate away from the light-emitting chip, and the metal back plate includes a side wall located at an edge; A glass protection plate is arranged on a side of the light emitting chip away from the metal back plate, and an edge of the glass protection plate overlaps a side wall of the metal back plate.

10. A display device, characterized in that: include: The display panel as claimed in claim 9.

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