Display panel and display device

Abstract

The invention discloses a display panel and a display device, and the display panel comprises at least one unit screen which comprises a driving substrate, a plurality of light-emitting units and a temperature-sensing element; the plurality of light emitting units are arranged on the surface of the driving substrate, and the temperature sensing element is arranged in the driving substrate or on the surface of the driving substrate; the temperature sensing element is used for detecting the temperature of the light emitting unit. The temperature of the light-emitting unit can be accurately measured, so that the display effect of the 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 display device. Background Art

[0002] Micro / Mini-Light Emitting Diode (M-LED) display technology is a new generation of display technology. Compared with the existing Organic Light-Emitting Diode (OLED) or Liquid Crystal Display (LCD) technology, it has the advantages of high resolution, high brightness, ultra-power saving, fast response speed, high light output efficiency and long life. It is widely used in commercial display, conference, monitoring and television display fields.

[0003] However, the existing M-LED display panel is prone to brightness changes during use, which affects the display effect of the display panel. Summary of the invention

[0004] The present invention provides a display panel and a display device, which can accurately measure the temperature of a light-emitting unit, thereby improving the display effect of the display panel.

[0005] According to one aspect of the present invention, there is provided a display panel, comprising:

[0006] At least one unit screen, the unit screen comprising a driving substrate, a plurality of light-emitting units and a temperature sensing element;

[0007] A plurality of light-emitting units are arranged on the surface of the driving substrate, and a temperature sensing element is arranged in the driving substrate or on the surface of the driving substrate;

[0008] The temperature sensing element is used to detect the temperature of the light emitting unit.

[0009] Optionally, the resistance value of the temperature sensing element changes with the temperature in a preset rule, and the temperature and the resistance value correspond one to one; or, the voltage value at both ends of the temperature sensing element changes with the temperature in a preset rule, and the voltage value at both ends of the temperature sensing element corresponds one to one;

[0010] Optionally, the resistance value of the temperature sensing element or the voltage value across the temperature sensing element varies linearly with temperature.

[0011] Optionally, the resistance temperature coefficient of the temperature sensing element is greater than a first preset value, the resistivity of the temperature sensing element is greater than a second preset value, and the specific heat capacity of the temperature sensing element is less than a third preset value;

[0012] Preferably, the material of the temperature sensing element includes platinum or copper.

[0013] Optionally, the driving substrate includes a base substrate and a driving circuit layer arranged on a side of the base substrate adjacent to the light emitting unit;

[0014] The temperature sensing element is arranged on the surface of the substrate, or arranged in the driving circuit layer, or arranged on the surface of the driving circuit layer;

[0015] Optionally, the driving circuit layer includes at least one metal layer and at least one insulating layer, and the temperature sensing element is arranged in the same layer as the at least one metal layer.

[0016] Optionally, a vertical projection of the temperature sensing element on the driving substrate is arranged adjacent to at least one light-emitting unit.

[0017] Optionally, a vertical projection of the temperature sensing element on the driving substrate surrounds at least one light-emitting unit;

[0018] Optionally, the vertical projection of the temperature sensing element on the driving substrate is in a spiral or ring shape.

[0019] Optionally, the display panel further includes:

[0020] A temperature measurement compensation circuit is connected between the temperature sensing element and the controller;

[0021] The controller is used to measure the resistance value of the temperature sensing element and determine the temperature of the light emitting unit according to the resistance value of the temperature sensing element;

[0022] The first end and the second end of the temperature measurement compensation circuit are electrically connected to the first end and the second end of the temperature sensing element respectively, the third end of the temperature measurement compensation circuit is used to receive the first voltage signal, and the fourth end of the temperature measurement compensation circuit is used to receive the second voltage signal, and the voltage difference between the first voltage signal and the second voltage signal is a constant value;

[0023] The temperature measurement compensation circuit is used to compensate for the influence of the wiring on the connection path between the temperature sensing element and the controller on the resistance value measurement result of the temperature sensing element.

[0024] Optionally, the temperature measurement compensation circuit includes a first resistor, a second resistor, a third resistor, a first conductive structure, a second conductive structure and a third conductive structure; wherein the first resistor and the second resistor have the same resistance value, the third resistor has a resistance value equal to the resistance value of the temperature sensing element at a preset temperature, and the first conductive structure, the second conductive structure and the third conductive structure have the same resistance value;

[0025] The first end of the first resistor is electrically connected to the first end of the second resistor, and the first end of the first resistor is used to receive a first voltage signal, and the second end of the first resistor is electrically connected to the first end of the first conductive structure;

[0026] The second end of the second resistor is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the first end of the second conductive structure;

[0027] The second end of the second conductive structure is electrically connected to the first end of the third conductive structure and the first end of the temperature sensing element respectively, the second end of the temperature sensing element is electrically connected to the second end of the first conductive structure, and the second end of the third conductive structure is used to receive a second voltage signal;

[0028] Optionally, the controller is used to obtain a first voltage at a node between the first resistor and the first conductive structure and a second voltage at a node between the third resistor and the second resistor, determine the resistance value of the temperature sensing element based on the first voltage, the second voltage, the resistance value of the first resistor, the resistance value of the third resistor, the resistance value of the first conductive structure, and the voltage difference between the first voltage signal and the second voltage signal, and determine the temperature of the light-emitting unit based on the resistance value.

[0029] Optionally, the first conductive structure includes a conductive wire, the second conductive structure includes a conductive wire, and the third conductive structure includes a conductive wire.

[0030] Optionally, the temperature measurement compensation circuit is disposed in the driving substrate, or disposed on a side of the driving substrate away from the light-emitting unit.

[0031] Optionally, the display panel further includes:

[0032] Support base plate and splicing cabinet;

[0033] The display panel includes at least two unit screens, and the at least two unit screens are fixedly arranged on the same surface of the supporting substrate;

[0034] The splicing box is arranged on a side of the supporting base plate away from the unit screen.

[0035] According to another aspect of the present invention, a display device is provided, comprising the display panel according to any embodiment of the present invention.

[0036] The display panel provided by the embodiment of the present invention includes: at least one unit screen, the unit screen includes a driving substrate, a plurality of light-emitting units and a temperature sensing element; the plurality of light-emitting units are arranged on the surface of the driving substrate, the temperature sensing element is arranged in the driving substrate or on the surface of the driving substrate; the temperature sensing element is used to detect the temperature of the light-emitting unit. By arranging the temperature sensing element in the driving substrate or on the surface of the driving substrate, the temperature sensing element is closer to the light-emitting unit, the temperature of the light-emitting unit is measured more accurately, and the display effect of the display panel can be better improved.

[0037] 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

[0038] 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.

[0039] Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0040] Figure 2 is a structural schematic diagram of a unit screen provided by an embodiment of the present invention;

[0041] Figure 3 is a structural schematic diagram of another unit screen provided by an embodiment of the present invention;

[0042] Figure 4 is a linear graph of the change in resistance of a temperature sensing element with temperature provided by an embodiment of the present invention;

[0043] Figure 5 is another linear graph of the change in resistance of a temperature sensing element with temperature provided by an embodiment of the present invention;

[0044] Figure 6 is a structural schematic diagram of another unit screen provided by an embodiment of the present invention;

[0045] Figure 7 is a structural schematic diagram of another unit screen provided by an embodiment of the present invention;

[0046] Figure 8 is a structural schematic diagram of another unit screen provided by an embodiment of the present invention;

[0047] Fig. 9 is a top view of the structure of a temperature sensing element provided by an embodiment of the present invention;

[0048] Fig.10 is a top view of the structure of another temperature sensing element provided by an embodiment of the present invention;

[0049] Fig.11 is a top view of the structure of another temperature sensing element provided by an embodiment of the present invention;

[0050] Fig.12 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0051] Fig.13 is a schematic diagram of a temperature measurement compensation circuit provided by an embodiment of the present invention;

[0052] Fig.14is a graph showing a corresponding relationship between the resistance value and the temperature of a temperature sensing element provided by an embodiment of the present invention;

[0053] Fig.15 It is a structural schematic diagram of another display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] As mentioned in the background technology, the existing M-LED display panel is prone to brightness changes during use, which affects the display effect of the display panel. The inventors have found through research that the reason for this problem is that M-LED generates a lot of heat during the light-emitting process, and the light-emitting brightness of M-LED decreases as the temperature rises. In the prior art, a mature temperature sensor is externally packaged to detect the temperature of the M-LED during the light-emitting process, so that the display panel is processed to improve the display effect when the temperature of the M-LED is high. However, the temperature measured by this solution is inaccurate, so it is not possible to improve the display effect of the display panel.

[0057] Based on the above problems, an embodiment of the present invention provides a display panel. Figure 1 is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 2 is a schematic diagram of the structure of a unit screen provided by an embodiment of the present invention, Figure 3 is a schematic diagram of the structure of another unit screen provided by an embodiment of the present invention, referring to Figure 1-Figure 3The display panel includes: at least one unit screen 10, the unit screen 10 includes a driving substrate 11, a plurality of light-emitting units 12 and a temperature sensing element 13; the plurality of light-emitting units 12 are arranged on the surface of the driving substrate 11, and the temperature sensing element 13 is arranged in the driving substrate 11 or on the surface of the driving substrate 11; the temperature sensing element 13 is used to detect the temperature of the light-emitting unit.

[0058] Among them, the driving substrate 11 is used to drive the light-emitting unit 12 to emit light, and the driving substrate may include a substrate and a driving circuit layer, and the driving circuit layer includes multiple driving circuits, and the driving circuit is used to drive the light-emitting unit to emit light. The light-emitting unit 12 may be a light-emitting element such as OLED, Micro LED or Mini LED. The temperature sensing element 13 may be a device whose preset electrical parameters change with temperature. By measuring the preset electrical parameters of the temperature sensing element 13, the temperature at the location of the temperature sensing element 13 can be determined. Exemplarily, according to the parameters of the temperature sensing element 13 whose resistance changes with temperature, the temperature at the location of the temperature sensing element 13 can be determined by measuring the resistance value of the temperature sensing element 13. One, two or more temperature sensing elements can be set in the display panel, and the two or more temperature sensing elements respectively measure the temperature of the light-emitting units 12 in different areas.

[0059] During the display process of the display panel, as the temperature rises, the brightness of the light-emitting unit 12 changes, affecting the display effect. By setting the temperature sensing element 13 inside the driving substrate 11 or on the surface of the driving substrate 11, the temperature sensing element 13 can be closer to the light-emitting unit 12, and the measured temperature of the light-emitting unit 12 can be more accurate, which can better improve the display effect of the display panel.

[0060] The display panel provided by the embodiment of the present invention includes: at least one unit screen 10, the unit screen 10 includes a driving substrate 11, a plurality of light-emitting units 12 and a temperature sensing element 13; the plurality of light-emitting units 12 are arranged on the surface of the driving substrate 11, and the temperature sensing element 13 is arranged in the driving substrate 11 or on the surface of the driving substrate 11; the temperature sensing element 13 is used to detect the temperature of the light-emitting unit. By arranging the temperature sensing element 13 in the driving substrate 11 or on the surface of the driving substrate 11, the temperature sensing element is closer to the light-emitting unit 12, and the temperature of the light-emitting unit 12 measured is more accurate, which can better improve the display effect of the display panel.

[0061] Optionally, the resistance value of the temperature sensing element 13 changes with the temperature in a preset rule, and the resistance value of the temperature sensing element 13 corresponds to the temperature one by one. Alternatively, the voltage value at both ends of the temperature sensing element 13 changes with the temperature in a preset rule, and the voltage value at both ends of the temperature sensing element 13 corresponds to the temperature one by one.

[0062] The preset regular change may be a linear change or a nonlinear change. Since the resistance value (or voltage value) and the temperature are in a one-to-one correspondence, by measuring the resistance value (or voltage value) of the temperature sensing element 13, the current temperature of the temperature sensing element 13 can be determined according to the preset regularity, and the current temperature of the light emitting unit 12 can be determined. Since the measurement of the resistance value and the voltage value can have a higher measurement accuracy, the resistance value or the voltage value of the temperature sensing element 13 is set to change with the temperature according to the preset regularity, and the temperature determined by measuring the resistance value or the voltage value of the temperature sensing element 13 is more accurate.

[0063] Optionally, the resistance value of the temperature sensing element 13 or the voltage value across the temperature sensing element 13 varies linearly with the temperature. This arrangement can reduce the amount of calculation in the process of determining the temperature of the light-emitting unit 12, and the current temperature of the temperature sensing element 13 can be determined more quickly according to the resistance value or voltage value of the temperature sensing element 13, thereby determining the temperature of the light-emitting unit 12 more quickly, and processing the display panel more quickly, thereby preventing the temperature of the light-emitting unit 12 from rising too quickly and affecting the light brightness.

[0064] Optionally, the resistance temperature coefficient of the temperature sensing element 13 is greater than a first preset value, the resistivity of the temperature sensing element 13 is greater than a second preset value, and the specific heat capacity of the temperature sensing element 13 is less than a third preset value.

[0065] Among them, the first preset value can be determined according to the temperature range of the light-emitting unit 12, etc. For example, the first preset value can be 200mΩ / ℃, 250mΩ / ℃, 300mΩ / ℃ or 350mΩ / ℃, etc., the second preset value can be 1Ω·m or 1.5Ω·m, etc., and the third preset value can be 0.5KJ / (kg*k) or 0.4KJ / (kg*k).

[0066] Specifically, the resistance temperature coefficient of the temperature sensing element 13 is the rate of change of the resistance value of the temperature sensing element 13 with temperature. The larger the resistance temperature coefficient, the greater the change in the resistance value of the temperature sensing element 13 when the temperature changes. The resistance temperature coefficient of the temperature sensing element 13 is set to be greater than the first preset value, so that when the temperature changes, the resistance value of the temperature sensing element 13 changes more, thereby improving the detection sensitivity.

[0067] The greater the resistivity of the temperature sensing element 13 is, the greater the resistance value of the temperature sensing element 13 is at the same temperature. Setting the resistivity of the temperature sensing element 13 to be greater than the second preset value allows the temperature sensing element 13 to have a greater resistance value, thereby improving detection accuracy.

[0068] The specific heat capacity of the temperature sensing element 13 affects the thermal inertia of the temperature sensing element 13. The smaller the specific heat capacity, the smaller the thermal inertia, and the faster the resistance value of the temperature sensing element 13 responds to temperature changes. The specific heat capacity of the temperature sensing element 13 is set to be less than the third preset value, so that the temperature sensing element 13 has a smaller thermal inertia, the resistance value responds to temperature changes faster, and the temperature of the light-emitting unit 12 can be measured faster and more accurately.

[0069] Optionally, the material of the temperature sensing element 13 includes platinum or copper.

[0070] Specifically, Figure 4 is a linear graph of the change in resistance of a temperature sensing element with temperature provided by an embodiment of the present invention, Figure 5 is another linear graph of the change in resistance of a temperature sensing element with temperature provided by an embodiment of the present invention;

[0071] Figure 4 It is a linear graph of the change of platinum (Pt) resistance with temperature, and the temperature detection range is -250℃~650℃;

[0072] Figure 5 This is a linear graph of platinum (Cu) resistance changing with temperature. The resistance temperature coefficient of platinum is 387.3074mΩ / ℃, the resistivity of platinum is 10.6Ω·m, and the specific heat capacity of platinum is 0.133KJ / (kg*k); the resistance temperature coefficient of copper is 427.956mΩ / ℃, the resistivity of copper is 1.678Ω·m, and the specific heat capacity of copper is 0.386KJ / (kg*k).

[0073] Platinum and copper both have high resistance temperature coefficient and resistivity, and have small specific heat capacity. When the temperature sensing element 13 is made of platinum and copper, it has high detection accuracy and detection sensitivity, and has a faster temperature detection speed. In addition, the resistance temperature coefficient of platinum and copper is stable, the physical and chemical properties are temperature, and the reproducibility is good, and they are easy to purify and convenient for mass production.

[0074] Optional, Figure 6 is a schematic diagram of the structure of another unit screen provided by an embodiment of the present invention, referring to Figure 6 The driving substrate includes a base substrate 111 and a driving circuit layer 112 disposed on a side of the base substrate 111 adjacent to the light emitting unit 12; the temperature sensing element 13 is disposed on the surface of the base substrate 111, or, Figure 7 is a schematic diagram of the structure of another unit screen provided by an embodiment of the present invention, referring to Figure 7 , the temperature sensing element 13 is disposed in the driving circuit layer 112, or, Figure 8 is a schematic diagram of the structure of another unit screen provided by an embodiment of the present invention, referring to Figure 8 The temperature sensing element 13 is disposed on the surface of the driving circuit layer 112 .

[0075] The base substrate 111 may be a glass substrate. The driving circuit layer 112 includes a plurality of driving circuits, and the driving circuits are used to drive the light-emitting unit 12 to emit light. The temperature sensing element 13 may be formed on the surface of the base substrate 111, or in the driving circuit layer 112, or on the surface of the driving circuit layer 112 by an evaporation process or a sputtering process.

[0076] Specifically, the temperature sensing element 13 can be disposed on a surface of the base substrate 111 away from the driving circuit layer 112 or on a surface adjacent to the driving circuit layer. The temperature sensing element 13 can also be disposed on a surface of the driving circuit layer 112 away from the base substrate 111 or on a surface adjacent to the driving circuit layer 112.

[0077] When the temperature sensing element 13 is disposed on the surface of the base substrate 111 or the surface of the driving circuit layer 112, the influence on the circuit inside the driving circuit layer 112 is small, and when the temperature sensing element 13 is disposed on the surface of the driving circuit layer 112 away from the base substrate 111, the temperature sensing element 13 is disposed on the same layer as the light emitting unit 12, and is closer to the light emitting unit 12, so that the temperature measurement is more accurate. When the temperature sensing element 13 is disposed inside the driving circuit layer 112, it can be disposed on the same layer as the internal film layer of the driving circuit layer 112, so that the number of film layers of the display panel can be reduced.

[0078] Optionally, the driving circuit layer 112 includes at least one metal layer and at least one insulating layer, and the temperature sensing element 13 is disposed in the same layer as the at least one metal layer.

[0079] Specifically, the driving circuit layer 112 may include one, two or more metal layers, and the temperature sensing element 13 and the metal layer are arranged in the same layer to ensure that the number of layers of the driving circuit layer 112 remains unchanged after the temperature sensing element 13 is arranged, and the thickness of the display panel is less affected. In addition, when the temperature sensing element 13 and the metal layer are made of the same material, the temperature sensing element 13 and the metal layer can be prepared in the same process, so that after the temperature sensing element 13 is arranged, the number of preparation processes of the display panel will not increase.

[0080] Optionally, the vertical projection of the temperature sensing element 13 on the driving substrate 11 is arranged adjacent to at least one light emitting unit 12. This arrangement makes the temperature measured by the temperature sensing element 13 closer to the actual temperature of the light emitting unit 12, and the measurement result is more accurate.

[0081] Optionally, a vertical projection of the temperature sensing element 13 on the driving substrate 11 surrounds at least one light emitting unit 12 .

[0082] This arrangement allows each position of the temperature sensing element 13 to be adjacent to the light emitting unit 12 and close to the light emitting unit 12 , thereby preventing some positions from being far away from the light emitting unit 12 and causing inaccurate temperature measurement.

[0083] Optional, Fig. 9is a top view of the structure of a temperature sensing element provided by an embodiment of the present invention, Fig.10 is a top view of the structure of another temperature sensing element provided by an embodiment of the present invention. Fig.11 is a top view of the structure of another temperature sensing element provided by an embodiment of the present invention, referring to Figure 9-10 , the vertical projection of the temperature sensing element on the driving substrate is in the shape of a spiral ( Fig. 9 and Fig.10 ) or annular ( Fig.11 ).

[0084] Among them, reference Fig. 9 and Fig.10 , the light-emitting unit can be arranged at the center of the spiral, Figure 9-11 The spiral or ring shape is merely an example and is not exclusive to the present invention. In other embodiments, the temperature sensing element may also include other forms of spiral or ring shapes, as long as the vertical projection of the temperature sensing element on the driving substrate surrounds the light-emitting unit and is close to the light-emitting unit.

[0085] Optional, Fig.12 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, with reference to, Fig.12 The display panel further includes: a temperature measurement compensation circuit 20, which is connected between the temperature sensing element 13 and the controller 30; the controller 30 is used to measure the resistance value of the temperature sensing element 13, and determine the temperature of the light-emitting unit according to the resistance value of the temperature sensing element 13.

[0086] The first end and the second end of the temperature measurement compensation circuit 20 are electrically connected to the first end and the second end of the temperature sensing element 13 respectively. The third end of the temperature measurement compensation circuit 20 is used to receive a first voltage signal. The fourth end of the temperature measurement compensation circuit 20 is used to receive a second voltage signal. The voltage difference between the first voltage signal and the second voltage signal is a constant. The temperature measurement compensation circuit 20 is used to compensate for the influence of the wiring on the connection path between the temperature sensing element 13 and the controller 30 on the resistance value measurement result of the temperature sensing element 13.

[0087] Specifically, the controller 30 may include a measurement circuit for obtaining the resistance value of the temperature sensing element 13. When measuring the resistance of the temperature sensing element 13, the wiring on the connection path between the controller 30 and the temperature sensing element 13 will affect the measurement result. By setting the temperature measurement compensation circuit 20, the resistance value of the wiring and the like can be compensated to improve the measurement accuracy. The specific form of the temperature measurement compensation circuit 20 can be set as needed, and this embodiment does not make a specific limitation, as long as it can compensate for the influence of the wiring on the connection path between the temperature sensing element 13 and the controller 30 on the resistance value measurement result of the temperature sensing element 13.

[0088] Optional, Fig.13 is a schematic diagram of a temperature measurement compensation circuit provided by an embodiment of the present invention, with reference to Fig.13 The temperature measurement compensation circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a first conductive structure 21, a second conductive structure 22 and a third conductive structure 23; wherein the first resistor R1 has the same resistance as the second resistor R2, the resistance of the third resistor R3 is equal to the resistance of the temperature sensing element 13 at a preset temperature, and the first conductive structure 21, the second conductive structure 22 and the third conductive structure 23 have the same resistance.

[0089] The first end of the first resistor R1 is electrically connected to the first end of the second resistor R2, and the first end of the first resistor R1 is used to receive the first voltage signal E1, and the second end of the first resistor R1 is electrically connected to the first end of the first conductive structure 21; the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3, and the second end of the third resistor R3 is electrically connected to the first end of the second conductive structure 22; the second end of the second conductive structure 22 is electrically connected to the first end of the third conductive structure 23 and the first end of the temperature sensing element 13 respectively, the second end of the temperature sensing element 13 is electrically connected to the second end of the first conductive structure 21, and the second end of the third conductive structure 23 is used to receive the second voltage signal E2.

[0090] The preset temperature can be determined according to the most commonly used temperature of the display panel, and an exemplary preset temperature can be 25 degrees, etc. The difference between the first voltage signal E1 and the second voltage signal E2 is E. When the temperature of the light-emitting unit 12 is 25 degrees, the temperature of the temperature-sensing element 13 is the same as that of the third resistor R3. At this time, the first voltage u1 at the node between the first resistor R1 and the first conductive structure 21 is equal to the second voltage u2 at the node between the second resistor R2 and the third resistor R3. Assuming that the resistance values ​​of the first resistor R1 and the second resistor R2 are R, the resistance values ​​of the first conductive structure 21, the second conductive structure 22 and the third conductive structure 23 are r, the resistance value of the third resistor R3 is Cu|25, and the resistance value of the temperature-sensing element is Cu|x, according to Fig.13 From the circuit diagram shown, we can conclude that:

[0091] I1=(E-u1) / R;

[0092] I2=(E-u2) / R;

[0093] r=(E-(Cu|25+R)*I2) / (I1+2*I2);

[0094] Cu|x=(E-(2*I1+I2)*r) / I1–R;

[0095] Temperature: x=(Cu|x-Cu|25) / ρ+25.

[0096] It can be seen from the above formula that the calculated temperature of the light-emitting unit is ultimately only related to the resistance Cu|x of the temperature sensing element, the resistance Cu|25 of the third resistor R3, the first voltage u1, the second voltage u2, the first voltage signal E1, the second voltage signal E2, the resistance R of the first resistor R1 and the second resistor R2, and the resistance r of the first conductive structure 21, the second conductive structure 22 and the third conductive structure 23, eliminating the influence of the connecting wiring on the temperature.

[0097] Optionally, the controller is used to obtain a first voltage u1 at a node between the first resistor R1 and the first conductive structure 21 and a second voltage u2 at a node between the third resistor R3 and the second resistor R2, determine the resistance value of the temperature sensing element 13 according to the first voltage u1, the second voltage u2, the resistance value of the first resistor R1, the resistance value of the third resistor R3, the resistance value of the first conductive structure 21, and the voltage difference E between the first voltage signal E1 and the second voltage signal E2, and determine the temperature of the light-emitting unit according to the resistance value.

[0098] Specifically, the controller may include a circuit for measuring the first voltage u2 and the second voltage u2. The controller only needs to measure the first voltage u2 and the second voltage u2 to calculate the resistance value of the temperature sensing element, thereby calculating the temperature of the light-emitting unit.

[0099] Fig.14 is a graph showing the relationship between the resistance value and temperature of the temperature sensing element provided in the embodiment of the present invention, with reference to Fig.14 , Fig.14 This is a graph showing the relationship between the resistance value and temperature of the copper material. The temperature of the copper is determined by measuring the resistance value of the copper at this time. Since the copper is close to the light-emitting unit, the temperature of the copper is the temperature of the light-emitting unit. Therefore, the temperature of the current light-emitting unit can be accurately measured.

[0100] Optional, reference Fig.13 The first conductive structure 21 includes a conductive wire, the second conductive structure 22 includes a conductive wire, and the third conductive structure includes a conductive wire.

[0101] Among them, the first conductive structure 21 can be a wire connecting the first resistor R1 and the temperature sensing element 13, the second conductive structure 22 can be a wire connecting the third resistor R3 and the temperature sensing element 13, the third conductive structure 23 can be a wire connected to the temperature sensing element 13, and the end of the third conductive structure 23 not connected to the temperature sensing element 13 is used to receive the first voltage signal E2.

[0102] Optionally, the temperature measurement compensation circuit is disposed in the driving substrate, or disposed on a side of the driving substrate away from the light-emitting unit.

[0103] The temperature compensation circuit is arranged in the driving substrate, or arranged on a side of the driving substrate away from the light-emitting unit and closer to the temperature sensing element, which can shorten the wiring length between the temperature compensation circuit and the temperature sensing element and reduce the difficulty of wiring.

[0104] Optional, Fig.15 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.15 The display panel also includes: a supporting substrate 40 and a splicing box 50; the display panel includes at least two unit screens 10, and at least two unit screens 10 are fixedly arranged on the same surface of the supporting substrate 40; the splicing box 50 is arranged on a side of the supporting substrate 40 away from the unit screens 10.

[0105] Among them, the supporting substrate 40 is used to splice at least two splicing screens 10 together, the splicing box 50 is used to splice multiple supporting substrates 40 together, and the splicing box 50 may include a driving component, which is used to send a driving signal to the driving circuit so that the driving circuit drives the light-emitting unit to emit light.

[0106] An embodiment of the present invention further provides a display device based on the above embodiment, including the display panel described in any embodiment of the present invention.

[0107] Among them, the beneficial effects of the display device provided by the technical solution of the embodiment of the present invention are consistent with the beneficial effects of the display panel described in any embodiment of the present invention.

[0108] 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.

[0109] 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 display panel, characterized in that: include: At least one unit screen, the unit screen comprising a driving substrate, a plurality of light-emitting units and a temperature sensing element; The plurality of light emitting units are disposed on the surface of the driving substrate, and the temperature sensing element is disposed in the driving substrate or on the surface of the driving substrate; The temperature sensing element is used to detect the temperature of the light emitting unit.

2. The display panel according to claim 1, characterized in that: The resistance value of the temperature sensing element changes with the temperature in a preset rule, and the resistance value of the temperature sensing element corresponds to the temperature one by one; or, the voltage value at both ends of the temperature sensing element changes with the temperature in a preset rule, and the voltage value at both ends of the temperature sensing element corresponds to the temperature one by one; Preferably, the resistance value of the temperature sensing element or the voltage value across the temperature sensing element varies linearly with temperature.

3. The display panel according to claim 1 or 2, characterized in that: The resistance temperature coefficient of the temperature sensing element is greater than a first preset value, the resistivity of the temperature sensing element is greater than a second preset value, and the specific heat capacity of the temperature sensing element is less than a third preset value; Preferably, the material of the temperature sensing element includes platinum or copper.

4. The display panel according to claim 1, wherein: The driving substrate comprises a base substrate and a driving circuit layer arranged on a side of the base substrate adjacent to the light emitting unit; The temperature sensing element is arranged on the surface of the substrate, or arranged in the driving circuit layer, or arranged on the surface of the driving circuit layer; Preferably, the driving circuit layer includes at least one metal layer and at least one insulating layer, and the temperature sensing element is arranged in the same layer as the at least one metal layer.

5. The display panel according to claim 1, wherein: The temperature sensing element is disposed adjacent to at least one of the light emitting units in a vertical projection of the driving substrate; Preferably, the vertical projection of the temperature sensing element on the driving substrate surrounds at least one of the light-emitting units; Preferably, the vertical projection of the temperature sensing element on the driving substrate is in a spiral or ring shape.

6. The display panel according to claim 2, characterized in that: Also includes: A temperature measurement compensation circuit, wherein the temperature measurement compensation circuit is connected between the temperature sensing element and the controller; The controller is used to measure the resistance value of the temperature sensing element and determine the temperature of the light emitting unit according to the resistance value of the temperature sensing element; The first end and the second end of the temperature measurement compensation circuit are electrically connected to the first end and the second end of the temperature sensing element respectively, the third end of the temperature measurement compensation circuit is used to receive a first voltage signal, and the fourth end of the temperature measurement compensation circuit is used to receive a second voltage signal, and the voltage difference between the first voltage signal and the second voltage signal is a constant value; The temperature measurement compensation circuit is used to compensate for the influence of the wiring on the connection path between the temperature sensing element and the controller on the resistance value measurement result of the temperature sensing element.

7. The display panel according to claim 6, characterized in that: The temperature measurement compensation circuit includes a first resistor, a second resistor, a third resistor, a first conductive structure, a second conductive structure and a third conductive structure; wherein the first resistor and the second resistor have the same resistance value, the third resistor has a resistance value equal to the resistance value of the temperature sensing element at a preset temperature, and the first conductive structure, the second conductive structure and the third conductive structure have the same resistance value; The first end of the first resistor is electrically connected to the first end of the second resistor, and the first end of the first resistor is used to receive a first voltage signal, and the second end of the first resistor is electrically connected to the first end of the first conductive structure; The second end of the second resistor is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the first end of the second conductive structure; The second end of the second conductive structure is electrically connected to the first end of the third conductive structure and the first end of the temperature sensing element respectively, the second end of the temperature sensing element is electrically connected to the second end of the first conductive structure, and the second end of the third conductive structure is used to receive a second voltage signal; Preferably, the controller is used to obtain a first voltage at a node between the first resistor and the first conductive structure and a second voltage at a node between the third resistor and the second resistor, determine the resistance value of the temperature sensing element according to the first voltage, the second voltage, the resistance value of the first resistor, the resistance value of the third resistor, the resistance value of the first conductive structure, and the voltage difference between the first voltage signal and the second voltage signal, and determine the temperature of the light-emitting unit according to the resistance value; Preferably, the first conductive structure includes a conductive wire, the second conductive structure includes a conductive wire, and the third conductive structure includes a conductive wire.

8. The display panel according to claim 6, characterized in that: The temperature measurement compensation circuit is arranged in the driving substrate, or arranged on a side of the driving substrate away from the light emitting unit.

9. The display panel according to claim 1, characterized in that: Also includes: Support base plate and splicing cabinet; The display panel includes at least two unit screens, and the at least two unit screens are fixedly arranged on the same surface of the supporting substrate; The splicing box is arranged on a side of the supporting base plate away from the unit screen.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 9.

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