CN114242876A - Display panel and display device - Google Patents
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- CN114242876A CN114242876A CN202111564314.0A CN202111564314A CN114242876A CN 114242876 A CN114242876 A CN 114242876A CN 202111564314 A CN202111564314 A CN 202111564314A CN 114242876 A CN114242876 A CN 114242876A
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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
- H01L33/64—Heat extraction or cooling elements
- H01L33/642—Heat extraction or cooling elements characterized by the shape
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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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
Abstract
The invention discloses a display panel and a display device, and relates to the technical field of display, wherein the display panel comprises a display area and a bending area; the display panel includes: a substrate base plate; the light-emitting element is positioned on the substrate and at least comprises a first light-emitting element and a second light-emitting element, and the external quantum conversion efficiency of the first light-emitting element is smaller than that of the second light-emitting element; the substrate base plate is close to one side of the light-emitting element and also comprises a heat conduction layer, and in the direction perpendicular to the plane of the substrate base plate, the heat conduction layer is only partially overlapped with the first light-emitting element; the heat conducting layer at least partially extends to the bending area. The invention solves the problems of poor display effect caused by uneven temperature and large brightness attenuation of the red Micro-LED.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
The display panel may include a liquid crystal display, an LCD panel, an electrophoretic display panel, an organic light emitting display panel, an electroluminescent display panel, a field emission display panel, a surface conduction electron emitter display panel, a plasma display panel, a micro LED panel, and the like.
In recent years, research has been conducted on Micro light emitting diode (Micro-LED, an element made of an inorganic material or the like) display panels. The Micro-LED is made into an array, then transferred to a circuit substrate in batches, and finally added with a protective layer and an electrode, and the display panel is manufactured after being packaged, because each pixel can be independently addressed and independently emit light, the Micro-LED display panel can realize a picture with ultrahigh contrast and gorgeous performance, and the pixels of the Micro-LED have self-luminous characteristics and high light conversion efficiency, so that the Micro-LED display panel has very low energy consumption, and the power consumption is about 10% of that of an LCD panel and 50% of that of an organic light emitting display panel; furthermore, micro light emitting diodes are semi-permanent and environmentally friendly and have a long lifetime. Also, Micro-LEDs are much simpler in structure than LCDs and organic light emitting display panels.
At present, two main flow structures of Micro-LEDs are provided, wherein one structure is that all Micro-LEDs in a panel only emit blue light, then a quantum dot film (QD film) is arranged above part of blue Micro-LEDs, and the quantum dot film is irradiated by the light emitted by the blue Micro-LEDs, so that the quantum dot film is excited to perform color conversion, and the emitted light is red light and green light; the other structure is that the Micro-LED directly emits red light, green light and blue light without a quantum dot film.
However, the Micro-LEDs themselves are also particularly problematic, for example, the second structure has the problems that the service life of the display panel is reduced due to temperature unevenness, and the display effect is poor due to large brightness attenuation of the red Micro-LEDs at high temperature.
Disclosure of Invention
In view of the above, the present invention provides a display panel and a display device, so as to solve the problems of reduced service life of the display panel due to temperature unevenness and poor display effect due to large luminance attenuation of light emitting elements.
In one aspect, the present invention provides a display panel, including a display region and a bending region;
the display panel includes:
a substrate base plate;
a light emitting element on the substrate, the light emitting element including at least a first light emitting element and a second light emitting element, an external quantum conversion efficiency of the first light emitting element being smaller than an external quantum conversion efficiency of the second light emitting element;
the substrate base plate is provided with a first light-emitting element and a second light-emitting element, wherein the side, close to the light-emitting element, of the substrate base plate further comprises a heat conduction layer, and the heat conduction layer only partially overlaps with the first light-emitting element in the direction perpendicular to the plane of the substrate base plate;
the heat conducting layer at least partially extends to the bending area.
On the other hand, the invention also provides a display panel, which comprises a display area and a bending area, wherein the display area comprises a first area and a second area, and the bending area is abutted with the first area and the second area;
the display panel includes:
a substrate base plate;
a light emitting element on the substrate, the light emitting element including at least a first light emitting element and a second light emitting element, an external quantum conversion efficiency of the first light emitting element being smaller than an external quantum conversion efficiency of the second light emitting element;
the substrate base plate is provided with a first light-emitting element and a second light-emitting element, wherein the side, close to the light-emitting element, of the substrate base plate further comprises a heat conduction layer, and the heat conduction layer only partially overlaps with the first light-emitting element in the direction perpendicular to the plane of the substrate base plate;
the heat conducting layer at least partially extends to the bending area.
In another aspect, the invention further provides a display device including the display panel.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
the display panel comprises a display area, a bending area and a substrate base plate; the light-emitting element is positioned on the substrate and at least comprises a first light-emitting element and a second light-emitting element, and the external quantum conversion efficiency of the first light-emitting element is smaller than that of the second light-emitting element; the substrate base plate is close to one side of the light-emitting element and also comprises a heat conduction layer, and in the direction perpendicular to the plane of the substrate base plate, the heat conduction layer is only partially overlapped with the first light-emitting element; the heat conducting layer at least partially extends to the bending area. The substrate base plate comprises a substrate base plate, a bending area and a heat conduction layer, wherein the substrate base plate is arranged on the substrate base plate, the substrate base plate is arranged on the bending area, the heat conduction layer is arranged on one side of the substrate base plate close to a light-emitting element, and the heat conduction layer is only partially overlapped with the first light-emitting element in the direction perpendicular to the plane of the substrate base plate.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a display panel in the prior art;
fig. 2 is a graph showing a ratio of the attenuation of a red light emitting device, a green light emitting device, and a blue light emitting device after lighting;
FIG. 3 is a schematic plane structure diagram of a display panel according to the present invention;
FIG. 4 is a cross-sectional view taken along line A-A' of FIG. 3;
FIG. 5 is a schematic plane structure diagram of a display panel according to the present invention;
FIG. 6 is a schematic plane structure diagram of another display panel provided by the present invention;
FIG. 7 is a cross-sectional view B-B' of FIG. 6;
FIG. 8 is a further sectional view taken along line B-B' of FIG. 6;
FIG. 9 is a further sectional view taken along line B-B' of FIG. 6;
FIG. 10 is a schematic plan view of a display panel according to another embodiment of the present invention;
FIG. 11 is a schematic plan view of a display panel according to another embodiment of the present invention;
FIG. 12 is a schematic plan view of a display panel according to another embodiment of the present invention;
fig. 13 is a schematic plan view of a display device according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that:
the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In view of the problems of the Micro light emitting diodes in the prior art that the service life of the display panel is reduced due to uneven temperature and the display effect is poor due to large brightness attenuation of the red Micro-LED at high temperature, the inventors have studied the prior art as follows, referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of the display panel in the prior art, and fig. 2 is a graph comparing the attenuation of the red light emitting device, the green light emitting device, and the blue light emitting device after being turned on. The display panel 000 in fig. 1 includes a substrate 01, and a light emitting device 02 on the substrate 01, where the light emitting device 02 is a micro led, the light emitting device 02 includes a red light emitting device 03, a green light emitting device 04, and a blue light emitting device 05, and the red light emitting device 03 has an external quantum conversion efficiency smaller than that of the green light emitting device 04 and the blue light emitting device 05 compared to the green light emitting device 04 and the blue light emitting device 05, that is, the red light emitting device 03 requires a larger current to deenergize to achieve a corresponding brightness, so the red light emitting device 03 requires a higher PWM duty ratio to turn on, but the center temperature exceeds 65 ℃ after the red light emitting device 03 turns on for 90s, and the green light emitting device 04 and the blue light emitting device 05 do not require a larger current to deenergize, the PWM duty ratio is lower, and there is no burning problem, thus, the display panel 000 may cause a problem of temperature non-uniformity when emitting light, and particularly, the long-term use of the red light emitting device 03 after the temperature is increased may reduce the service life of the display panel. Referring to fig. 2, in fig. 2, the light emitting devices of three colors are all turned on for 90s, the duty ratio of the red light emitting device is 100%, the duty ratios of the green light emitting device and the blue light emitting device are 4%, the abscissa in fig. 2 is time (unit is s), the ordinate is luminance, after the light emitting devices of three colors are turned on for 90s, luminance attenuation of the red light emitting device exceeds 50%, and the attenuation of the green light emitting device and the blue light emitting device is small, it can be understood that the temperature rises, the concentrations of electrons and holes of the light emitting devices increase, the forbidden band width decreases, the electron mobility decreases, and simultaneously, as the temperature rises, the light emission of the phosphor quantum efficiency decreases, and the external light extraction efficiency of the light emitting devices decreases. After the red light-emitting device 03 is turned on for 90s, the temperature is increased greatly and the brightness is attenuated more greatly, which results in poor display effect.
In view of the above, the present invention provides a display panel and a display device, and specific embodiments of the display panel and the display device will be described in detail below.
Referring to fig. 3 to 5, fig. 3 is a schematic plan view illustrating a display panel according to the present invention, fig. 4 is a cross-sectional view taken along a direction a-a' in fig. 3, fig. 5 is a schematic plan view illustrating a display panel according to the present invention, and a display panel 100 according to the present embodiment includes a display area AA and a bending area W; wherein the display panel includes: a base substrate 1; a light emitting element 2 on the substrate 1, the light emitting element 2 including at least a first light emitting element 3 and a second light emitting element 4, the external quantum conversion efficiency of the first light emitting element 3 being smaller than the external quantum conversion efficiency of the second light emitting element 4; the side of the substrate base plate 1 close to the light-emitting element 2 further comprises a heat conduction layer 5, and in the direction perpendicular to the plane of the substrate base plate 1, the heat conduction layer 5 only at least partially overlaps with the first light-emitting element 3; the heat conducting layer 5 extends at least partially to the inflection zone W.
Specifically, the substrate 1 in this embodiment may be a flexible substrate 1, and Polyimide (PI) can achieve better heat resistance and stability, and thus is widely used as a flexible display substrate material.
The display panel of the present invention includes a display area AA and a bending area W, although the bending area W may or may not have a display function, the display panel in fig. 3 and 5 is described by taking the example that the bending area W does not have a display function.
It can be understood that the light emitting element 2 in the present invention may be a micro LED or a mini LED, both of which belong to light emitting devices that emit light under current driving, and the quantum efficiency can effectively reflect the performance of the light emitting element, which is the most important parameter for measuring the performance of the light emitting element, and the quantum efficiency can be divided into an internal quantum efficiency and an external quantum efficiency, where the External Quantum Efficiency (EQE) is the ratio of the number of photons finally emitted from the device to the number of carriers injected, and reflects the overall light emitting efficiency of the light emitting element.
Fig. 3 shows only a case where the heat conductive layer 5 partially overlaps only the first light emitting element 3 in a direction perpendicular to the plane of the substrate base 1, and fig. 5 shows only a case where the heat conductive layer 5 covers the first light emitting element 3 in a direction perpendicular to the plane of the substrate base 1. Fig. 3 and 5 show a case where the heat conductive layer 5 extends at least partially to the bending region W, but the present invention is not limited to the arrangement of the heat conductive layer 5, as long as it is satisfied that the heat conductive layer 5 at least partially overlaps the first light emitting element 3 in a direction perpendicular to the plane of the substrate base 1 and can extend into the bending region W.
It is understood that, after the first light emitting element 3 is lit for a period of time, the temperature increases, the concentration of electrons and holes increases, the electron mobility decreases, and as the temperature increases, the quantum efficiency of the phosphor of the first light emitting element 3 decreases, the light output decreases, and the external light extraction efficiency of the first light emitting element 3 decreases. On the contrary, when the temperature is lowered, the concentration of electrons and holes is also lowered, the electron mobility is improved, and as the temperature is lowered, the quantum efficiency of the phosphor of the first light emitting element 3 is improved, the light emission amount is increased, the external light extraction efficiency of the first light emitting element 3 is increased, and the problem of the attenuation of the first light emitting element 3 is solved.
In the present embodiment, the external quantum conversion efficiency of the first light emitting element 3 is smaller than that of the second light emitting element 4, that is, the first light emitting element 3 needs a larger current to deenergize to achieve the corresponding brightness, as can be seen from the above, the first light emitting element in the prior art achieves a higher temperature after being lighted for a shorter time, and the brightness of the first light emitting element is attenuated more than that of the second light emitting element due to the temperature increase, whereas the substrate base 1 further comprises a heat conducting layer 5 on the side close to the light emitting element 2, the heat conducting layer 5 only partially overlaps with the first light emitting element 3 in the direction perpendicular to the plane of the substrate base 1, and the heat conducting layer 5 at least partially extends to the bending region W, and when the temperature of the first light emitting element 3 rises after being lighted for a period of time, the temperature can be transmitted to the bending region W through the heat conducting layer 5, therefore, the temperature generated after the first light-emitting element 3 is lighted can be conducted to the bending area W through the heat conduction layer 5, the temperature of the first light-emitting element 3 is close to that of the second light-emitting element 4 after being conducted to the bending area W, the problem of uneven temperature of the light-emitting element 2 is solved, the service life of the whole machine is prolonged, and the problem of large brightness attenuation of the first light-emitting element 3 is solved after the temperature of the first light-emitting element 3 is conducted to the bending area W.
It should be noted that the heat conduction layer 5 in the present invention is used for conducting the temperature generated by the first light emitting element 3 to the bending region W, so that the larger the overlapping area of the heat conduction layer 5 and the first light emitting element 3 in the direction perpendicular to the plane of the substrate 1, the better the heat conduction effect, the better the problem of uneven temperature of the light emitting element 2 is improved, the longer the service life of the whole device is, and the more the brightness attenuation of the first light emitting element 3 can be reduced.
In some alternative embodiments, with continued reference to fig. 3 and 5, the thermally conductive layer includes a plurality of first sub-portions 51 and a second sub-portion 52, the plurality of first sub-portions 51 are arranged along the first direction X and extend along the second direction Y, the second sub-portion 52 extends along the first direction X, the plurality of first sub-portions 51 are all connected to the second sub-portion 52, and the first direction X and the second direction Y intersect.
In this embodiment, the display panel of fig. 3 and 5 has the first sub-portions 51 corresponding to the pixel columns where the first light emitting elements 3 are located, and of course, the first sub-portions 51 extend along the first direction X and the second direction Y, that is, along the row direction, and one of the first sub-portions 51 is located in the bending region W; the second sub-section 52 extending in the first direction X is provided in the lower area of the display panel, and of course, the first sub-section 51 and the second sub-section 52 are connected, but of course, the first sub-section 51 and the second sub-section 52 may be integrated, that is, the first sub-portion 51 and the second sub-portion 52 are manufactured in the same process, that is, the heat conducting layer 5 is configured to be a heat conducting net structure, the temperature of the first light emitting element 3 is transmitted to the first sub-portion 51 in the bending region W through the first sub-portion 51 of the heat conducting layer 5 and the second sub-portion 52, the temperature of the first light emitting element 3 is close to the temperature of the second light emitting element 4 after being transmitted to the first sub-portion 51 of the bending region W, the problem of temperature unevenness of the light emitting element 2 is solved, the service life of the whole machine is prolonged, of course, the temperature of the first light-emitting element 3 reaches the first sub-portion 51 of the bending region W, so that the problem of the first light-emitting element 3 that the luminance is greatly attenuated is also reduced.
In some alternative embodiments, referring to fig. 6 and 7, fig. 6 is a schematic plan view of a display panel provided by the present invention, fig. 7 is a cross-sectional view of B-B' in fig. 6, the state of the bending region W in fig. 7 is the state when bending does not occur, fig. 6 and 7 show that the bending region includes a first deformation layer 7 and a second deformation layer 8, the first deformation layer 7 and the second deformation layer 8 have different coefficients of endothermic expansion, and the heat conductive layer 5 is sandwiched between the first deformation layer 7 and the second deformation layer 8 in the direction perpendicular to the plane of the substrate base plate 1.
It is understood that the heat conductive layer 5 is sandwiched between the first deformation layer 7 and the second deformation layer 8 in the bending region W, and fig. 6 shows that the first sub-portion 51 of the heat conductive layer 5 is located in the bending region W, but the display panel in this embodiment is applicable to any of the above embodiments, for example, the heat conductive layer 5 includes a plurality of first sub-portions 51 and a second sub-portion 52, the plurality of first sub-portions 51 extend along the first direction X and the second sub-portion 52 extends along the first direction X, and the plurality of first sub-portions 51 are connected to the second sub-portion 52, so that the temperature of the first light emitting element 3 is transmitted to the first sub-portion 51 in the bending region W through the first sub-portions 51 of the heat conductive layer 5 via the second sub-portions 52.
In the present embodiment, the first deformation layer 7 and the second deformation layer 8 have different coefficients of endothermic expansion, so when the temperature of the first light emitting element 3 is transmitted to the first sub-portion 51 in the bending region W through the first sub-portion 51 of the heat conductive layer 5 via the second sub-portion 52, and then is absorbed by the first deformation layer 7 and the second deformation layer 8, due to the difference in the coefficients of endothermic expansion of the first deformation layer 7 and the second deformation layer 8, the degree of expansion with heat and contraction with cold of the first deformation layer 7 and the second deformation layer 8 are different, the degree of buckling of the first deformation layer 7 after absorbing heat and the degree of buckling of the second deformation layer 8 after absorbing heat are different, thus, the bending region W will be bent, in this embodiment, the temperature generated by the first light emitting device 3 after emitting light is transmitted to the bending region W to bend the bending region W, the problem of temperature unevenness of the light emitting element 2 is solved, the first light emitting element 3 is reduced in luminance attenuation and the bending region W can be bent by heat.
In some alternative embodiments, referring to fig. 8 and 9, fig. 8 is a further cross-sectional view taken along the direction B-B 'in fig. 6, fig. 9 is a further cross-sectional view taken along the direction B-B' in fig. 6, and the bending region W in fig. 8 and 9 is in a bent state, the first deformation layer is located on the side of the second deformation layer 8 close to the substrate base plate 1, and the endothermic expansion coefficient of the first deformation layer 7 is greater than that of the second deformation layer 8, or the endothermic expansion coefficient of the first deformation layer 7 is less than that of the second deformation layer 8.
Note that, in both fig. 8 and fig. 9, the first deformation layer 7 is located on the side of the second deformation layer 8 close to the base substrate 1, the endothermic expansion coefficient of the first deformation layer 7 in fig. 8 is smaller than that of the second deformation layer 8, and the endothermic expansion coefficient of the first deformation layer 7 in fig. 9 is larger than that of the second deformation layer 8.
Of course, in fig. 8, the endothermic expansion coefficient of the first deformation layer 7 is smaller than that of the second deformation layer 8, so that after the temperature generated by the first light-emitting element 3 after emitting light is transmitted to the bending region W, the degree of expansion of the second deformation layer 8 is greater than that of the first deformation layer 7, that is, the bending degree of the first deformation layer 7 after absorbing heat is smaller than that of the second deformation layer 8 after absorbing heat, and the bending is concave; in fig. 9, the endothermic expansion coefficient of the first deformation layer 7 is greater than the endothermic expansion coefficient of the second deformation layer 8, so that after the temperature generated by the first light emitting element 3 emitting light is transferred to the bending region W, the degree of expansion of the first deformation layer 7 is greater than the degree of expansion of the second deformation layer 8, that is, the degree of bending of the first deformation layer 7 after absorbing heat is greater than the degree of bending of the second deformation layer 8 after absorbing heat, and the first deformation layer 7 is concave after bending.
In this embodiment, the endothermic expansion coefficient of the first deformation layer 7 is greater than the endothermic expansion coefficient of the second deformation layer 8, or the endothermic expansion coefficient of the first deformation layer 7 is less than the endothermic expansion coefficient of the second deformation layer 8, and the temperature generated after the first light emitting element 3 emits light is transferred to the bending region W so that the bending region W is concave or recessed.
In some alternative embodiments, with continued reference to fig. 6-9, first deforming layer 7 and second deforming layer 8 are polycarbonate or hot melt adhesive.
Alternatively, the material of the first deformable layer 7 and the material of the second deformable layer 8 may be the same or different:
the materials of the first deformation layer 7 and the second deformation layer 8 are the same, the first deformation layer 7 and the second deformation layer 8 are polycarbonate, or the first deformation layer 7 and the second deformation layer 8 are hot melt adhesive, but the endothermic expansion coefficients of the first deformation layer 7 and the second deformation layer 8 are different, if the endothermic expansion coefficient of the first deformation layer 7 is smaller than that of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is smaller than that of the second deformation layer 8, and the bending degree is concave after bending, and if the endothermic expansion coefficient of the first deformation layer 7 is larger than that of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is larger than that of the second deformation layer 8 after absorbing heat, and the bending degree is concave after bending.
When the materials of the first deformation layer 7 and the second deformation layer 8 are different, the first deformation layer 7 may be polycarbonate, the second deformation layer 8 is hot melt adhesive, or the first deformation layer 7 is hot melt adhesive, the second deformation layer 8 is polycarbonate, but the endothermic expansion coefficients of the first deformation layer 7 and the second deformation layer 8 are different, if the endothermic expansion coefficient of the first deformation layer 7 is smaller than the endothermic expansion coefficient of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is smaller than the bending degree of the second deformation layer 8 after absorbing heat, and the bending degree is concave after bending, if the endothermic expansion coefficient of the first deformation layer 7 is larger than the endothermic expansion coefficient of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is larger than the bending degree of the second deformation layer 8 after absorbing heat, and the bending degree is concave after bending.
The first deformation layer 7 and the second deformation layer 8 in this embodiment are made of polycarbonate or hot melt adhesive, and whether the temperature generated after the first light-emitting element 3 emits light is transmitted to the bending region W so that the bending region W is concave or concave.
In some alternative embodiments, referring to fig. 10, fig. 10 is a schematic plan view illustrating a display panel according to still another embodiment of the present invention, where the display panel 100 in fig. 10 includes a display area AA and a bending area W; the display area AA includes a first area and a second area 12, and the bending area W abuts against the first area 11 and the second area 12, wherein the display panel includes: a base substrate 1; a light emitting element 2 on the substrate 1, the light emitting element 2 including at least a first light emitting element 3 and a second light emitting element 4, the external quantum conversion efficiency of the first light emitting element 3 being smaller than the external quantum conversion efficiency of the second light emitting element 4; the side of the substrate base plate 1 close to the light-emitting element 2 further comprises a heat conduction layer 5, and in the direction perpendicular to the plane of the substrate base plate 1, the heat conduction layer 5 only at least partially overlaps with the first light-emitting element 3; the heat conducting layer 5 extends at least partially to the inflection zone W.
It is understood that, along the first direction X, the bending area W is located between the first area 11 and the second area 12, and the bending area W abuts against the first area 11 and the second area 12, respectively, where the display panel is a tiled screen. Of course, fig. 10 only schematically illustrates that the first region 11 and the second region 12 are spliced together through the bending region in the first direction X, and of course, the number of the first region 11 and the second region 12 is not specifically limited here, as shown in fig. 11, fig. 11 is a schematic plane structure diagram of another display panel provided by the present invention, the number of the first region 11 and the second region 12 in fig. 11 is two, that is, splicing may be performed in the second direction Y, and the heat conduction layer 5 also extends into the bending region W.
Of course, in the present embodiment, the heat conduction layer 5 is disposed in each of the first region 11 and the second region 12, in the direction perpendicular to the plane of the substrate base plate 1, the heat conduction layer 5 at least partially overlaps only the first light-emitting element 3, the heat conduction layer 5 at least partially extends to the bending region W, when the temperature of the first light-emitting element 3 in the first region 11 increases after lighting for a period of time, the temperature can be transmitted to the bending region W through the heat conduction layer 5, when the temperature of the first light-emitting element 3 in the second region 12 increases after lighting for a period of time, the temperature generated by the first light-emitting element 3 in the first region 11 and the first light-emitting element 3 in the second region 12 after lighting can be transmitted to the bending region W through the heat conduction layer 5, and the temperature of the first light-emitting element 3 in the first region 11 and the first light-emitting element 3 in the second region 12 after lighting can be close to the temperature of the second light-emitting element 4 after transmitting to the bending region W, the problem of uneven temperature of the light-emitting elements 2 can be solved, the service life of the whole spliced screen is prolonged, and the problem of large brightness attenuation of the first light-emitting elements 3 in the first area 11 and the first light-emitting elements 3 in the second area 12 is also reduced after the temperature of the first light-emitting elements 3 is transmitted to the bending area W.
In some alternative embodiments, with continued reference to fig. 10, the first and second regions 12 are arranged along a first direction X; the heat conductive layer 5 includes a plurality of first sub-portions 51 and a second sub-portion 52, the plurality of first sub-portions 51 are arranged along the first direction X and extend along the second direction Y, one of the first sub-portions 51 is located in the bending region W, the second sub-portion 52 extends along the first direction X, the plurality of first sub-portions 51 are connected to the second sub-portion 52, and the first direction X and the second direction Y intersect.
Referring to fig. 10, in fig. 10, the bending region W is located between the first region 11 and the second region 12 along the first direction X, and the bending region W is respectively abutted to the first region 11 and the second region 12, the heat conductive layer 5 includes a plurality of first sub-portions 51 and a plurality of second sub-portions 52 arranged along the first direction X and extending in the second direction Y, wherein one of the first sub-portions 51 is located in the bending region W, the second sub-portion 52 extends along the first direction X, and the plurality of first sub-portions 51 are connected to the second sub-portions 52, and optionally, the first sub-portions 51 and the second sub-portions 52 may be an integral structure.
In the present embodiment, the first sub-portion 51 is disposed in each of the first region 11 and the second region 12, the first sub-portion 51 only overlaps with the first light-emitting element 3 at least partially in a direction perpendicular to the plane of the substrate 1 in the first region 11, the first sub-portion 51 further provides the bending region W, when the temperature of the first light-emitting element 3 in the first region 11 increases after the first sub-portion 51 and the second sub-portion 52 is lit for a period of time, the temperature can be transmitted to the first sub-portion 51 of the bending region W through the first sub-portion 51 and the second sub-portion 52, when the temperature of the first light-emitting element 3 in the second region 12 increases after the first light-emitting element 3 is lit for a period of time, the temperature can be transmitted to the first sub-portion 51 of the bending region W through the heat conductive layer 5, so that the temperatures generated by the first light-emitting element 3 in the first region 11 and the first light-emitting element 3 in the second region 12 after the first light-element 3 is lit for a period of time can be transmitted to the first sub-portion 51 of the bending region W, the temperature of the first light-emitting element 3 in the first region 11 and the temperature of the first light-emitting element 3 in the second region 12 are close to the temperature of the second light-emitting element 4 after being transmitted to the first sub-portion 51, which can also improve the problem of temperature unevenness of the light-emitting elements 2, improve the service life of the whole spliced screen, and certainly reduce the problem of large brightness attenuation of the first light-emitting element 3 in the first region 11 and the first light-emitting element 3 in the second region 12 after the temperature of the first light-emitting element 3 is transmitted to the bending region W.
In some alternative embodiments, referring to fig. 12 and with continuing reference to fig. 8 and 9, fig. 12 is a schematic plan view of a display panel provided by the present invention, and referring to fig. 8 and 9, a cross-sectional view of a bending region W in fig. 12 may refer to fig. 8 and 9, the bending region W includes a first deformation layer 7 and a second deformation layer 8, coefficients of endothermic expansion of the first deformation layer 7 and the second deformation layer 8 are different, and the heat conductive layer 5 is sandwiched between the first deformation layer 7 and the second deformation layer 8 in a direction perpendicular to a plane of the substrate base plate 1.
In the present embodiment, the first deformation layer 7 and the second deformation layer 8 have different coefficients of endothermic expansion, so when the temperature of the first light emitting element 3 is transmitted to the first sub-portion 51 in the bending region W through the first sub-portion 51 of the heat conductive layer 5 via the second sub-portion 52, and then is absorbed by the first deformation layer 7 and the second deformation layer 8, due to the difference in the coefficients of endothermic expansion of the first deformation layer 7 and the second deformation layer 8, the degree of expansion with heat and contraction with cold of the first deformation layer 7 and the second deformation layer 8 are different, the degree of buckling of the first deformation layer 7 after absorbing heat and the degree of buckling of the second deformation layer 8 after absorbing heat are different, thus, the bending region W will be bent, in this embodiment, the temperature generated by the first light emitting device 3 after emitting light is transmitted to the bending region W to bend the bending region W, the problem of temperature unevenness of the light emitting element 2 is solved, the first light emitting element 3 is reduced in luminance attenuation and the bending region W can be bent by heat.
In some alternative embodiments, with continued reference to fig. 8, 9 and 12, the inflection zone W includes a first deformation layer 7 and a second deformation layer 8, the first deformation layer 7 being located on a side of the second deformation layer 8 adjacent to the substrate base plate 1, the first deformation layer 7 having an endothermic expansion coefficient greater than that of the second deformation layer 8, or the first deformation layer 7 having an endothermic expansion coefficient less than that of the second deformation layer 8.
If the endothermic expansion coefficient of the first deformation layer 7 is smaller than the endothermic expansion coefficient of the second deformation layer 8, the degree of bending after the first deformation layer 7 absorbs heat is smaller than the degree of bending after the second deformation layer 8 absorbs heat, and the bent layer is concave upward, and if the endothermic expansion coefficient of the first deformation layer 7 is larger than the endothermic expansion coefficient of the second deformation layer 8, the degree of bending after the first deformation layer 7 absorbs heat is larger than the degree of bending after the second deformation layer 8 absorbs heat, and the bent layer is concave downward.
Optionally, with continued reference to fig. 8, 9, and 12, the first deformable layer and the second deformable layer are polycarbonate or hot melt adhesive.
The material of the first deformable layer 7 and the material of the second deformable layer 8 may be the same or different:
the materials of the first deformation layer 7 and the second deformation layer 8 are the same, the first deformation layer 7 and the second deformation layer 8 are polycarbonate, or the first deformation layer 7 and the second deformation layer 8 are hot melt adhesive, but the endothermic expansion coefficients of the first deformation layer 7 and the second deformation layer 8 are different, if the endothermic expansion coefficient of the first deformation layer 7 is smaller than that of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is smaller than that of the second deformation layer 8, and the bending degree is concave after bending, and if the endothermic expansion coefficient of the first deformation layer 7 is larger than that of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is larger than that of the second deformation layer 8 after absorbing heat, and the bending degree is concave after bending.
When the materials of the first deformation layer 7 and the second deformation layer 8 are different, the first deformation layer 7 may be polycarbonate, the second deformation layer 8 is hot melt adhesive, or the first deformation layer 7 is hot melt adhesive, the second deformation layer 8 is polycarbonate, but the endothermic expansion coefficients of the first deformation layer 7 and the second deformation layer 8 are different, if the endothermic expansion coefficient of the first deformation layer 7 is smaller than the endothermic expansion coefficient of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is smaller than the bending degree of the second deformation layer 8 after absorbing heat, and the bending degree is concave after bending, if the endothermic expansion coefficient of the first deformation layer 7 is larger than the endothermic expansion coefficient of the second deformation layer 8, the bending degree of the first deformation layer 7 after absorbing heat is larger than the bending degree of the second deformation layer 8 after absorbing heat, and the bending degree is concave after bending.
The first deformation layer 7 and the second deformation layer 8 in this embodiment are made of polycarbonate or hot melt adhesive, and whether the temperature generated after the first light-emitting element 3 emits light is transmitted to the bending region W so that the bending region W is concave or concave.
In some alternative embodiments, with continued reference to fig. 3-10, the material of the thermally conductive layer is copper or silver.
In this embodiment, the heat conduction layer 5 is disposed in the display panel for transferring the temperature of the first light emitting element 3 to the bending region W, and copper or silver is a good heat conductor, so that the temperature of the first light emitting element 3 is more favorably transferred to the bending region W, the problem of uneven temperature of the light emitting element 2 is more favorably solved, and the problem of large luminance attenuation of the first light emitting element 3 is favorably reduced.
In some alternative embodiments, with continued reference to fig. 4, the display panel further includes a buffer layer 13 on a side of the substrate base 1 adjacent to the light emitting elements 2, and the heat conduction layer 5 and the buffer layer 13 are disposed in the same layer.
Referring to fig. 7, the display panel includes a substrate 1 and a buffer layer 13 located on a side of the substrate 1 close to the light emitting element 2, and certainly also includes a heat conducting layer 5 located on a side of the substrate 1 close to the light emitting element 2, and the heat conducting layer 5 and the buffer layer 13 may be disposed on the same layer, so that it is not necessary to separately dispose a heat conducting layer 5 in the display panel, which is beneficial to reducing the thickness of the display panel.
In some alternative embodiments, with continued reference to fig. 3-5, the light emitting elements are micro LEDs, the light emitting color of the first light emitting element 3 is red, and the light emitting color of the second light emitting element 4 is green or blue.
It can be understood that the external quantum conversion efficiency of the red micro LED is less than that of the green micro LED and the blue micro LED, that is, the red micro LED needs a larger current to deexcite to achieve the corresponding brightness, so the red micro LED needs a higher PWM duty ratio to light, but the central temperature exceeds 65 ℃ after the red micro LED lights for 90s, while the green red micro LED and the blue red micro LED do not need a larger current to deexcite, the PWM duty ratio is lower, there is no burning problem, especially the long-term use of the red micro LED after the temperature rises will reduce the service life of the display panel, the concentration of electrons and holes will increase after the temperature of the red micro LED rises, the electron mobility will decrease, and the light emission will decrease with the temperature rise, and the external light extraction efficiency will decrease, in the present invention, in the heat conducting layer 5 at the position corresponding to the red micro LED, when the red micro LED is lighted for a period of time, the temperature is transmitted to the bending area W through the heat conduction layer 5, the temperature of the red micro LED is close to that of the green micro LED or the blue micro LED after being transmitted to the bending area W, the problem of uneven temperature of the light-emitting element 2 is solved, the service life of the whole machine is prolonged, and the problem of large brightness attenuation of the red micro LED is also solved after the temperature of the red micro LED is transmitted to the bending area W.
Based on the same inventive concept, in some optional embodiments, please refer to fig. 13, fig. 13 is a schematic plan view of a display device according to the present invention, and the display device 1000 according to the present embodiment includes the display panel 100 according to the above embodiments of the present invention. The embodiment of fig. 13 is only an example of a mobile phone, and the display device 1000 is described, it is to be understood that the display device 1000 provided in the embodiment of the present invention may be another display device 1000 having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1000 provided in the embodiment of the present invention has the beneficial effects of the display panel 100 provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel 100 in the foregoing embodiments, and the detailed description of the embodiment is not repeated herein.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following beneficial effects:
the display panel comprises a display area, a bending area and a substrate base plate; the light-emitting element is positioned on the substrate and at least comprises a first light-emitting element and a second light-emitting element, and the external quantum conversion efficiency of the first light-emitting element is smaller than that of the second light-emitting element; the substrate base plate is close to one side of the light-emitting element and also comprises a heat conduction layer, and in the direction perpendicular to the plane of the substrate base plate, the heat conduction layer is only partially overlapped with the first light-emitting element; the heat conducting layer at least partially extends to the bending area. The substrate base plate comprises a substrate base plate, a bending area and a heat conduction layer, wherein the substrate base plate is arranged on the substrate base plate, the substrate base plate is arranged on the bending area, the heat conduction layer is arranged on one side of the substrate base plate close to a light-emitting element, and the heat conduction layer is only partially overlapped with the first light-emitting element in the direction perpendicular to the plane of the substrate base plate.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (13)
1. The display panel is characterized by comprising a display area and a bending area;
the display panel includes:
a substrate base plate;
a light emitting element on the substrate, the light emitting element including at least a first light emitting element and a second light emitting element, an external quantum conversion efficiency of the first light emitting element being smaller than an external quantum conversion efficiency of the second light emitting element;
the substrate base plate is provided with a first light-emitting element and a second light-emitting element, wherein the side, close to the light-emitting element, of the substrate base plate further comprises a heat conduction layer, and the heat conduction layer only partially overlaps with the first light-emitting element in the direction perpendicular to the plane of the substrate base plate;
the heat conducting layer at least partially extends to the bending area.
2. The display panel of claim 1, wherein the thermally conductive layer comprises a plurality of first sub-portions and a second sub-portion, the plurality of first sub-portions extending in a second direction along the first direction, the second sub-portions extending in the first direction, the plurality of first sub-portions each being connected to the second sub-portion, the first direction and the second direction intersecting.
3. The display panel according to claim 1, wherein the inflection region includes a first deformation layer and a second deformation layer, the first deformation layer and the second deformation layer have different coefficients of endothermic expansion, and the thermally conductive layer is interposed between the first deformation layer and the second deformation layer in a direction perpendicular to a plane of the substrate base plate.
4. The display panel according to claim 1, wherein the first deformation layer is located on a side of the second deformation layer close to the substrate base plate, wherein,
the first deformation layer has an endothermic expansion coefficient greater than that of the second deformation layer, or the first deformation layer has an endothermic expansion coefficient less than that of the second deformation layer.
5. The display panel of claim 1, wherein the first and second deformable layers are polycarbonate or hot melt adhesive.
6. The display panel is characterized by comprising a display area and a bending area, wherein the display area comprises a first area and a second area, and the bending area is abutted with the first area and the second area;
the display panel includes:
a substrate base plate;
a light emitting element on the substrate, the light emitting element including at least a first light emitting element and a second light emitting element, an external quantum conversion efficiency of the first light emitting element being smaller than an external quantum conversion efficiency of the second light emitting element;
the substrate base plate is provided with a first light-emitting element and a second light-emitting element, wherein the side, close to the light-emitting element, of the substrate base plate further comprises a heat conduction layer, and the heat conduction layer only partially overlaps with the first light-emitting element in the direction perpendicular to the plane of the substrate base plate;
the heat conducting layer at least partially extends to the bending area.
7. The display panel according to claim 6, wherein the first region and the second region are arranged in a first direction;
the heat conducting layer comprises a plurality of first sub-portions and a second sub-portion, the first sub-portions are arranged along the first direction and extend along the second direction, one of the first sub-portions is located in the bending area, the second sub-portion extends along the first direction, the first sub-portions are connected with the second sub-portion, and the first direction and the second direction are intersected.
8. The display panel according to claim 6, wherein the inflection region includes a first deformation layer and a second deformation layer, the first deformation layer and the second deformation layer have different coefficients of endothermic expansion, and the thermally conductive layer is interposed between the first deformation layer and the second deformation layer in a direction perpendicular to a plane of the substrate base plate.
9. The display panel according to claim 6, wherein the first deformation layer is located on a side of the second deformation layer close to the substrate base plate, wherein,
the first deformation layer has an endothermic expansion coefficient greater than that of the second deformation layer, or the first deformation layer has an endothermic expansion coefficient less than that of the second deformation layer.
10. The display panel according to claim 1 or 6, wherein the material of the heat conductive layer is copper or silver.
11. The display panel according to claim 1 or 6, wherein the display panel further comprises a buffer layer on a side of the substrate adjacent to the light emitting element, and the heat conductive layer and the buffer layer are disposed on the same layer.
12. The display panel according to claim 1 or 6, wherein the light-emitting elements are micro LEDs, and wherein the emission color of the first light-emitting element is red and the emission color of the second light-emitting element is green or blue.
13. A display device comprising the display panel according to any one of claims 1 to 12.
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