Display panel and display device

Abstract

The application discloses a display panel and a display device, and relates to the technical field of display, wherein the display area comprises a plurality of pixel areas, each of which comprises at least one pixel; each pixel area further comprises a monitoring unit; the monitoring unit comprises a conductive unit, and the conductive unit comprises low-temperature polysilicon material; and / or the monitoring unit comprises a first driving circuit, and the first driving circuit comprises at least one low-temperature polysilicon transistor; the display panel further comprises a signal detection module, which is used for detecting signals at at least one end of the monitoring unit. Since the resistivity of low-temperature polysilicon changes with temperature, the change of the signals at at least one end of the monitoring unit detected by the signal detection module can be used to determine whether the temperature of the area where the monitoring unit is located is abnormal, so that the chroma or brightness of the display product can be compensated according to the temperature, and the display effect of the display product under an abnormal temperature environment is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a display panel and a display device. Background Technology

[0002] From the CRT (Cathode Ray Tube) era to the LCD (Liquid Crystal Display) era, and now to the OLED (Organic Light Emitting Diode) and LED display era, the display industry has undergone decades of rapid development. The display industry is now inextricably linked to our lives; from traditional mobile phones, tablets, televisions, and PCs to today's smart wearable devices, VR, and automotive displays, all electronic devices rely heavily on display technology.

[0003] Display products are prone to screen overheating during operation. When the screen temperature rises, it can cause severe color distortion, affecting display quality. Effective monitoring of screen temperature allows for display compensation based on temperature changes. However, achieving effective monitoring of display product screen temperature remains one of the current technological bottlenecks. Summary of the Invention

[0004] In view of this, the present invention provides a display panel and display device, which incorporates a monitoring unit containing low-temperature polysilicon, and the temperature change of the screen can be determined by detecting the signal of the monitoring unit.

[0005] In a first aspect, the present invention provides a display panel, wherein the display area of ​​the display panel includes a plurality of pixel areas, and the pixel areas include at least one pixel;

[0006] The pixel area also includes a monitoring unit.

[0007] The monitoring unit includes a conductive unit, which is made of low-temperature polycrystalline silicon material;

[0008] And / or, the monitoring unit includes a first driving circuit, the first driving circuit including at least one low-temperature polysilicon transistor;

[0009] The display panel also includes a signal detection module, which is used to detect the signal at at least one end of the monitoring unit.

[0010] Secondly, based on the same inventive concept, the present invention also provides a display device, including the display panel provided in the first aspect of the present invention.

[0011] Compared with the prior art, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0012] The display panel and display device provided by this invention incorporate a monitoring unit and a signal detection module. The monitoring unit includes a device composed of low-temperature polycrystalline silicon. The resistivity of low-temperature polycrystalline silicon changes with temperature. This application introduces a monitoring unit within the pixel area. When the temperature in the pixel area changes, the current or voltage corresponding to the low-temperature polycrystalline silicon will also change with the temperature. Therefore, by detecting the signal at at least one end of the monitoring unit in the pixel area through the signal detection module, the temperature change in the pixel area can be determined by the detected signal change, thereby achieving effective monitoring of the display screen temperature. Furthermore, the introduction of a monitoring unit within the pixel area enables pixel-level temperature monitoring, which is beneficial for achieving refined temperature monitoring within the display panel. When the temperature of the display screen is effectively monitored, the display data can be adjusted according to temperature changes, avoiding abnormal display problems such as color shift or abnormal brightness due to temperature changes, thus improving the overall display effect of the display panel.

[0013] Of course, any product implementing this invention need not necessarily achieve all of the technical effects described above at the same time.

[0014] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0016] Figure 1 The image shown is a plan view of a display panel provided in an embodiment of the present invention;

[0017] Figure 2 The diagram shows a relative positional relationship between the signal detection module, pixels in a pixel area, and the monitoring unit.

[0018] Figure 3 The diagram shown is a schematic representation of a monitoring unit in a display panel provided in an embodiment of the present invention.

[0019] Figure 4 The diagram shown is another structural schematic of the monitoring unit in the display panel provided in an embodiment of the present invention;

[0020] Figure 5 The diagram shown is another structural schematic of the monitoring unit in the display panel provided in an embodiment of the present invention;

[0021] Figure 6The diagram shown is a connection schematic of the first driving circuit in the display panel provided in an embodiment of the present invention;

[0022] Figure 7 The diagram shows a connection schematic of the first driving circuit and the control chip;

[0023] Figure 8 The figure shows the characteristic of the ratio of driving current at high temperature and normal temperature.

[0024] Figure 9 The diagram shown is a schematic representation of a pixel driving circuit applicable to this application.

[0025] Figure 10 The diagram shows a connection between a pixel driving circuit and a conductive unit.

[0026] Figure 11 The diagram shows one possible arrangement of the monitoring units on the display panel.

[0027] Figure 12 The diagram shows another arrangement of the monitoring units on the display panel;

[0028] Figure 13 The diagram shown is a schematic diagram of the arrangement of the monitoring unit when the display panel provided in this embodiment of the invention is a transparent display panel;

[0029] Figure 14 The diagram shown is a schematic diagram of another arrangement of the monitoring unit when the display panel provided in this embodiment of the invention is a transparent display panel;

[0030] Figure 15 The diagram shown is a schematic diagram of another arrangement of the monitoring unit when the display panel provided in this embodiment of the invention is a transparent display panel;

[0031] Figure 16 The image shown is a cross-sectional view of a display panel provided in an embodiment of the present invention;

[0032] Figure 17 The image shown is another cross-sectional view of the display panel provided in an embodiment of the present invention;

[0033] Figure 18 The diagram shown is a timing diagram of the pixel driving circuit and the first driving circuit.

[0034] Figure 19 The diagram shown is a structural schematic of a display device provided in an embodiment of the present invention. Detailed Implementation

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0038] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] Various modifications and variations can be made to this invention without departing from its spirit or scope, as will be apparent to those skilled in the art. Therefore, this invention is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this invention can be combined with each other without contradiction.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0041] Figure 1 The image shown is a plan view of a display panel provided in an embodiment of the present invention. Figure 2 The diagram shown illustrates the relative positions of the signal detection module, pixels within a pixel region, and the monitoring unit. Please refer to it. Figure 1 and Figure 2 The present invention provides a display panel 100, wherein the display area AA of the display panel 100 includes a plurality of pixel areas Q0, and each pixel area Q0 includes at least one pixel; the pixel area Q0 also includes a monitoring unit 10.

[0042] The monitoring unit 10 includes a conductive unit 12, which is made of low-temperature polycrystalline silicon material.

[0043] And / or, the monitoring unit 10 includes a first driving circuit 11, which includes at least one low-temperature polysilicon transistor;

[0044] The display panel also includes a signal detection module 20, which is used to detect the signal at at least one end of the monitoring unit 10.

[0045] It should be noted that, Figure 1 The illustration uses a rounded rectangular display panel as an example only, and does not limit the actual shape of the display panel. Figure 1 This illustration only shows one arrangement of pixel areas Q0 in the display panel and does not limit the number, shape, or arrangement of pixel areas Q0 actually contained in the display panel. Figure 2 The illustration is based on the example of a pixel region Q0 containing one pixel, but it does not limit the actual number and shape of pixels contained in a pixel region Q0. In some other embodiments of the present invention, the number of pixels contained in a pixel region Q0 may be two or more.

[0046] Please combine Figure 1 and Figure 2 The present invention introduces a monitoring unit 10 in pixel region Q0. The monitoring unit 10 has at least three feasible configuration schemes, please refer to... Figure 3 The first approach involves the monitoring unit 10 comprising only a conductive unit 12. This conductive unit 12 is made of low-temperature polycrystalline silicon material. The conductive unit 12 can acquire electrical signals through a control chip in the display panel; for example, the control chip can provide a constant current signal to the conductive unit 12. Please refer to [reference needed]. Figure 4 The second approach involves the monitoring unit 10 comprising only a first driving circuit 11. The first driving circuit 11 includes at least one low-temperature polysilicon transistor. The first driving circuit 11 can be connected to a control chip in the display panel, obtaining electrical signals through the control chip. For example, when the transistor in the first driving circuit 11 is turned on, the control chip can provide a constant current signal to the transistor. Please refer to [reference needed]. Figure 5 The third approach involves the monitoring unit 10 including both the aforementioned conductive unit 12 and the first driving circuit 11. The conductive unit 12 is connected to the first driving circuit 11 and receives electrical signals through the first driving circuit 11. The first driving circuit 11 receives signals through a control chip, for example, the control chip can control the transistors in the first driving circuit 11 to conduct, transmitting the current signal to the conductive unit 10. Figures 3 to 5Three schematic diagrams of the monitoring unit 10 in the display panel provided in the embodiments of the present invention are shown respectively. In the aforementioned three schemes, the monitoring unit 10 includes a device composed of low-temperature polycrystalline silicon. The resistivity of low-temperature polycrystalline silicon changes with temperature. In this application, a monitoring unit 10 is introduced in the pixel area Q0. When the temperature in the pixel area Q0 changes, the current or voltage corresponding to the low-temperature polycrystalline silicon will also change with the temperature change. Therefore, when the signal detection module 20 detects the signal at least one end of the monitoring unit 10 in the pixel area Q0, the temperature change in the pixel area Q0 can be determined by the change in the detected signal, thereby realizing effective monitoring of the temperature of the display screen of the display panel. In addition, the present invention introduces a monitoring unit 10 in the pixel area Q0, which can realize temperature monitoring at the pixel area level, which is beneficial to realizing fine monitoring of the temperature in the display panel. When the temperature of the display screen is effectively monitored, the display data can be adjusted according to the temperature change, avoiding abnormal display problems such as color shift or uneven brightness due to temperature changes, thus improving the overall display effect of the display panel.

[0047] Please combine Figure 1 and Figure 5 In an optional embodiment of the present invention, the monitoring unit 10 includes a conductive unit 12 and a first driving circuit 11; one end of the conductive unit 12 is connected to the first driving circuit 11, and the other end is connected to a fixed voltage signal terminal S; the signal detection module 20 detects the voltage or current across the conductive unit 12.

[0048] This embodiment illustrates the specific connection relationship between the conductive unit 12 and the first driving circuit 11 when the monitoring unit 10 simultaneously includes the conductive unit 12 and the first driving circuit 11. The output terminal of the first driving circuit 11 is connected to one end of the conductive unit 12, and the other end of the conductive unit 12 receives a fixed voltage signal, such as grounding. In this monitoring unit 10, a first feasible implementation is as follows: when the conductive unit 12 includes low-temperature polycrystalline silicon material, the first driving circuit 11 does not include a low-temperature polycrystalline silicon transistor. When the first driving circuit 11 provides a constant driving current to the conductive unit 12, if the temperature of the pixel area Q0 where the conductive unit 12 is located rises abnormally, the resistivity of the conductive unit 12 itself will change, and therefore the voltage across its terminals will change. The signal detection module 20 can detect the change in the voltage across its terminals to determine the temperature change of the pixel area Q0.

[0049] A second feasible implementation of the monitoring unit 10 is as follows: the conductive unit 12 does not include low-temperature polysilicon material, and the first driving circuit 11 includes a low-temperature polysilicon transistor. If the temperature of the pixel area Q0 where the conductive unit 12 is located rises abnormally, the driving current output by the first driving circuit 11 to the conductive unit 12 will change with the temperature. When the driving current received by the conductive unit 12 changes, the voltage at its two ends will also change. Therefore, the change in temperature of the pixel area Q0 can also be determined by detecting the change in voltage at its two ends using the signal detection module 20.

[0050] A third feasible implementation of the monitoring unit 10 is as follows: the conductive unit 12 includes a low-temperature polycrystalline silicon material, the first driving circuit 11 includes a low-temperature polycrystalline silicon transistor, the resistivity of the conductive unit 12 and the driving current output by the first driving circuit 11 to the conductive unit 12 both change with temperature. At this time, a calibration test can be performed to test the voltage change of the conductive unit 12 and the corresponding relationship with temperature. In this way, the voltage across the conductive unit 12 can also be monitored in the display panel using the signal detection module 20, and the temperature corresponding to the aforementioned voltage can be determined based on the calibration test results. Thus, the monitoring of the display panel screen temperature can also be achieved.

[0051] Please continue to refer to this. Figure 5 In an optional embodiment of the present invention, the first driving circuit 11 includes a switching transistor K1, which is a low-temperature polysilicon transistor; the gate of the switching transistor K1 is electrically connected to the first control line 21, the first electrode is electrically connected to the first data terminal 40, and the second electrode is electrically connected to the conductive unit 12.

[0052] In this embodiment, the connection relationship between the monitoring unit 10, which includes both the first driving circuit 11 and the conductive unit 12, is explained. Specifically, the first driving circuit 11 may include only one switching transistor K1. The switching transistor K1 is turned on or off under the control of the control signal provided by the first control line 21. The two terminals of the switching transistor K1 are connected to the first data terminal 40 and the conductive unit 12, respectively. When it is necessary to monitor the temperature of the pixel area Q0, a control signal can be transmitted to the switching transistor K1 through the first control line 21 to turn it on. Thus, the signal from the first data terminal 40 can be transmitted to the conductive unit 12 through the turned-on switching transistor K1. Since the switching transistor K1 is a low-temperature polysilicon transistor, when the temperature of the pixel area Q0 where the first driving circuit 11 is located changes, the driving current output by the switching transistor K1 to the conductive unit 12 will change with the temperature, and the voltage across the conductive unit 12 will also change with the driving current. By detecting the voltage change across the conductive unit 12 through the signal detection module 20, the temperature change of the pixel area Q0 where the first driving circuit 11 is located can be determined. Moreover, the first driving circuit 11 in this embodiment only includes a single switching transistor K1, eliminating the need for complex circuit design. This simplifies the structure of the first driving circuit 11 and reduces the space occupied by the first driving circuit 11 on the display panel, thus improving the overall screen-to-body ratio of the display panel.

[0053] Figure 6 The diagram shown is a connection schematic of the first driving circuit 11 in the display panel provided in an embodiment of the present invention. Please refer to it. Figure 6 In an optional embodiment of the present invention, the gates of the switching transistors K1 in the plurality of first driving circuits 11 are all electrically connected to the same first control line 21, and the first terminals of the switching transistors K1 are all connected to the same first data terminal 40.

[0054] When a first driving circuit 11 is introduced into multiple pixel areas Q0 on the display panel, optionally, the gate of the switching transistor K1 in each first driving circuit 11 can be connected to the same first control line 21. Thus, the switching transistor K1 in each first driving circuit 11 can be controlled to turn on or off through a single first control line 21. When temperature monitoring is required, a control signal is transmitted through the first control line 21 to control the simultaneous conduction of each switching transistor K1, eliminating the need for different first control lines 21 for different first driving circuits 11. Optionally, the first control line 21 is connected to the signal terminal of the control chip in the display panel. When only one first control line 21 is introduced for each first driving circuit 11, only one signal terminal needs to be provided on the control chip to connect to the first control line 21, which also simplifies the structure of the control chip. Furthermore, in this embodiment, the first terminal of the switching transistor K1 in each first driving circuit 11 is connected to the same first data terminal 40, so there is no need to introduce different data terminals 40 for different first driving circuits 11. Optionally, the first data terminal 40 is connected to the signal terminal of the control chip in the display panel. Therefore, introducing a first data terminal 40 for each first driving circuit 11 is also beneficial to simplifying the structure of the control chip.

[0055] Figure 7 The diagram shows a connection between the first driving circuit 11 and the control chip IC. In an optional embodiment of the present invention, the display panel further includes a control chip IC, and the first driving circuit 11 is also connected to the control chip IC to... Figure 7 Taking the illustrated embodiment as an example, the first terminal of the switching transistor K1 in the first driving circuit 11 is connected to the first data terminal 40 in the control chip IC. The control chip IC is used to transmit a fixed current signal to the first driving circuit 11. The current value of the current signal is I, where I ≤ 0.1 μA.

[0056] Figure 8 The diagram shows the ratio of driving current at high and normal temperatures, representing the driving current ratios for red pixel R, green pixel G, and blue pixel B at 85°C and 25°C, as well as the ratios at 50°C and 25°C. The ratio of high-temperature to room-temperature current increases as the driving current at room temperature decreases. Furthermore, with increasing temperature, the ratio of high-temperature to room-temperature current also increases for the same photocurrent. Moreover, when using a small current drive, the ratio of high-temperature to room-temperature current is larger; the smaller the current, the larger the corresponding ratio, making it easier to detect temperature changes. Therefore, in this embodiment, when the current transmitted from the control chip IC to the first driving circuit 11 is set to I ≤ 0.1 μA, the aforementioned current ratio will be larger, which is more conducive to monitoring the voltage changes across the conductive unit 12, thus further improving temperature detection accuracy.

[0057] Continue to refer to Figure 7In an optional embodiment of the present invention, the resistance of the conductive unit 12 is R1, wherein 10mΩ ≤ R1 ≤ 10000mΩ. When the impedance of the conductive unit 12 is too large, the voltage change across the conductive unit 12 is weak when only a small current is supplied to the conductive unit 12. When the impedance of the conductive unit 12 is set to 10mΩ to 10000mΩ, and a current of less than or equal to 0.1μA is supplied to the conductive unit 12, the voltage change across the conductive unit 12 will be more significant with temperature changes, thus improving the accuracy of temperature monitoring.

[0058] The pixel area Q0 of this invention is provided with a pixel driving circuit, which is used to drive the pixels in the display panel to perform the display function. The pixel driving circuit generates heat during operation, which causes the screen temperature of the display panel to rise. Figure 9 The diagram shown is a schematic representation of a pixel driving circuit applicable to this application. This pixel driving circuit is for illustrative purposes only and does not limit the actual structure of the pixel driving circuit in the display panel of this invention. Optionally, please refer to... Figure 9The pixel driving circuit includes a driving transistor T3, a data writing module 91, a compensation module 92, a first reset module 93, a light emission control module 94, and a second reset module 95. The gate of the driving transistor T3 is connected to a first node N1, its first terminal is connected to a second node N2, and its second terminal is connected to a third node N3. Optionally, the data writing module 91 includes a second transistor T2, the light emission control module 94 includes a first transistor T1 and a sixth transistor T5, the compensation module 92 includes a fourth transistor T4, the first reset module 93 includes a fifth transistor T5, and the second reset module 95 includes a seventh transistor T7. The fifth transistor T5 in the first reset module 93 has its two terminals connected to a first reset signal line Vref1 and a first node N1, respectively, and its gate is connected to a first scan line S1. In the data writing module 91, the two terminals of the second transistor T2 are connected to the data line Data and the second node N2, respectively. The gate of the second transistor T2 in the data writing module 91 and the gate of the fourth transistor T4 in the compensation module 92 are connected to the second scan line S2. In the second reset module 95, the two terminals of the seventh transistor T7 are connected to the second reset signal line Vref2 and the fourth node N4, respectively. The gate of the seventh transistor T7 is connected to the second scan line S2. In the light emission control module 94, the two terminals of the first transistor T1 are connected to the first power supply signal line PVDD and the second node N2, respectively. The gate is connected to the light emission control signal line EM. The fourth node N4 is connected to the anode of the light emission element D0, and the cathode of the light emission element D0 is connected to the second power supply signal line PVEE. It should be noted that in the pixel driving circuit provided in this embodiment, only P-type transistors are used as an example for explanation, but the type of transistor is not limited. In some other embodiments of the present invention, at least some transistors in the pixel driving circuit may also be N-type transistors. The pixel driving circuit in this embodiment is only illustrative and does not limit the actual structure and connection relationship of the pixel driving circuit. The working timing of the pixel driving circuit will be explained in subsequent embodiments.

[0059] In this invention, each pixel in pixel region Q0 is driven by a corresponding pixel driving circuit. Optionally, at least one of the first transistor T1 to the seventh transistor T7 in the driving circuit can be a low-temperature polysilicon transistor. In an optional embodiment of this invention, at least one low-temperature polysilicon transistor in the first driving circuit 11 reuses a transistor in the pixel driving circuit. Thus, there is no need to introduce a new low-temperature polysilicon transistor into the first driving circuit 11; the low-temperature polysilicon transistor in the pixel driving circuit can be reused, which helps to simplify the overall structure of the display panel.

[0060] Optionally, when the pixel driving circuit itself includes a low-temperature polysilicon transistor, the entire pixel driving circuit can be reused as the first driving circuit 11. When the temperature in the pixel area Q0 where the pixel driving circuit is located changes, the output current of the pixel driving circuit will also change with the temperature change. By monitoring the output current of the pixel driving circuit through the signal detection module 20, the temperature change of the pixel area Q0 can be determined. Thus, there is no need to introduce an additional first driving circuit 11 in the display panel, which helps to simplify the structure of the display panel. When the pixel driving circuit is reused as the first driving circuit 11 in the monitoring unit 10, the monitoring unit 10 may also include a conductive unit 12 connected to the pixel driving circuit, for example, please refer to Figure 10 , Figure 10 The diagram shows a connection between the pixel driving circuit and the conductive unit 12. In this case, the temperature change in the pixel area Q0 can also be determined by detecting the voltage change across the conductive unit 12 through the signal detection unit. In this case, the resistance of the conductive unit 12 can also be set to 10mΩ≤R1≤10000mΩ, and the current output by the pixel driving circuit to the conductive unit 12 can also be set to I≤0.1μA.

[0061] In one optional embodiment of the present invention, please refer to... Figure 6 and Figure 7 When a conductive unit 12 is introduced into the display panel, the maximum length of the orthographic projection of a single conductive unit 12 onto the plane of the display panel is D0, where 10μm≤D0≤100μm. Considering that if the conductive unit 12 is large, it would be difficult to integrate it into the pixel area Q0, taking a transparent display panel as an example, if the conductive unit 12 is large, such as the temperature microsensor commonly used in the prior art, its size is usually above 700μm. The space in the pixel area is insufficient to accommodate the conductive unit 12. Moreover, considering that the spacing between adjacent pixel areas in a transparent display panel is usually 100μm to 250μm, if the temperature microsensor used in the prior art is used as the conductive unit, it will occupy a large amount of space in both the pixel area and the transparent area, significantly affecting the transmittance of the display panel. Therefore, in this embodiment of the invention, the maximum length of the conductive unit 12 is set to 10μm to 100μm, which is much smaller than the size of the temperature microsensor in the prior art. It can be placed in the pixel area Q0 without occupying the space in the transparent area Q1, thus avoiding any impact on the transparency of the transparent display panel.

[0062] Figure 11 The diagram shows one possible arrangement of the monitoring unit 10 on the display panel. Figure 12 The diagram shown illustrates another arrangement of the monitoring unit 10 on the display panel. Please refer to it as appropriate. Figure 11In an optional embodiment of the present invention, the number of monitoring units 10 included in the display panel is less than or equal to the number of pixels. When monitoring units 10 are introduced into the display panel, one monitoring unit 10 can be set in the area corresponding to each pixel. At this time, the number of monitoring units 10 in the display panel is equal to the number of pixels. In this way, when the temperature of the area corresponding to each pixel is abnormal, it can be effectively detected, which helps to improve the accuracy of temperature detection.

[0063] In some other embodiments of the present invention, please refer to Figure 12 The number of monitoring units 10 introduced in the display panel can be less than the number of pixels. Considering that if the display panel contains a large number of pixels and the distance between pixels is small, the temperature changes of adjacent pixel areas are the same or basically the same, then a monitoring unit 10 can be set in the area corresponding to multiple pixels. The temperature changes of the corresponding area can be monitored through this one monitoring unit 10. In this way, while monitoring the screen temperature of the display panel, it is also beneficial to reduce the actual number of monitoring units 10 contained in the display panel and reduce the space occupied by the monitoring units 10 in the display panel. Therefore, it is also beneficial to improve the screen ratio of the display panel.

[0064] Figure 13 The diagram shown is a schematic representation of the arrangement of the monitoring unit 10 when the display panel is a transparent display panel, as provided in an embodiment of the present invention. Please refer to the diagram. Figure 13 In an optional embodiment of the present invention, the display panel further includes a transparent area Q1 located between adjacent pixel areas Q0. Each pixel area Q0 includes at least one pixel, and each pixel area Q0 is provided with a monitoring unit 10. Alternatively, at least some pixel areas Q0 are not provided with a monitoring unit 10.

[0065] This embodiment illustrates a transparent display panel scheme in the present invention. In the transparent display panel, adjacent pixel areas Q0 are isolated by a transparent area Q1, and the circuit structure, etc., are all located in pixel areas Q0. Pixel area Q0 includes at least one pixel P0. Figure 13Taking a pixel area Q0 comprising multiple pixels P0, with each pixel area Q0 equipped with a monitoring unit 10, as an example, the following explanation is provided. In the transparent display panel, the pixel driving circuit and other circuit structures in the display area AA are all located in the pixel area Q0. Since adjacent pixel areas Q0 are isolated by the transparent area Q1, the heat generated by the pixel driving circuit and other components is concentrated in the pixel area Q0. When the monitoring unit 10 is placed in the pixel area Q0, the temperature change of the pixel area Q0 can be monitored in a targeted manner. If a corresponding monitoring unit 10 is provided in each pixel area Q0, the temperature of each pixel area Q0 can be effectively monitored. Furthermore, when the monitoring unit 10 is placed in the pixel area Q0, the monitoring unit 10 does not occupy the space of the transparent area Q1, and therefore does not affect the transmittance of the transparent display panel.

[0066] It should be noted that the number of pixels contained in pixel area Q0 in this embodiment of the invention is only illustrative and does not limit the actual number of pixels contained in pixel area Q0.

[0067] Figure 14 The diagram shows another arrangement of the monitoring unit 10 when the display panel provided in this embodiment of the invention is a transparent display panel. In this embodiment, at least some pixel areas Q0 are not provided with monitoring units 10, which is equivalent to only providing monitoring units 10 in some pixel areas Q0. Assuming that the pixel areas Q0 in the display panel are arranged in an array, the temperature changes of pixel areas Q0 in the same row are basically the same. Thus, one or several pixel areas Q0 in a row can be selected to set the monitoring unit 10. The average value of the signal values ​​of several monitoring units 10 in the corresponding row of pixel areas Q0 detected by the signal detection unit can be used as the evaluation standard for the temperature change of the pixel areas Q0 in that row. This arrangement helps to reduce the number of monitoring units 10 actually included in the display panel and simplifies the structural complexity of the display panel.

[0068] Please refer to Figures 11 to 13 In one optional embodiment of the present invention, the monitoring units 10 are evenly arranged in the display area AA. The even arrangement allows the temperature of each zone of the display panel to be monitored, which is beneficial to improving the comprehensiveness of temperature monitoring of each area of ​​the display screen. Even arrangement can be seen, for example, as the interval between two adjacent monitoring units 10 in the same row is the same, the interval between two adjacent monitoring units in the same column is the same, or the monitoring units 10 are evenly arranged in the display area.

[0069] Figure 15 The diagram shown illustrates another arrangement of the monitoring unit 10 when the display panel provided in this embodiment of the invention is a transparent display panel. Please refer to [the diagram]. Figure 15In an optional embodiment of the present invention, the display panel includes a bonding area A0 located on one side of the display area AA. The bonding area A0 is used to bond a control chip or a flexible circuit board. The display area AA includes a sub-display area A1 adjacent to the bonding area A0. The area of ​​the sub-display area A1 is smaller than the area of ​​the display area AA. The monitoring unit 10 is only provided in the sub-display area A1.

[0070] This embodiment illustrates another feasible arrangement of the monitoring unit 10 in the display panel. Specifically, the monitoring unit 10 is only set in the sub-display area A1 adjacent to the bonding area A0. The inventors discovered that areas with high temperatures on the display screen are mainly concentrated in the display area AA near the bonding area A0. This part of the display area AA is more likely to require chromaticity and brightness compensation due to temperature changes. Therefore, in this embodiment, setting the monitoring unit 10 in the sub-display area A1 adjacent to the bonding area A0 is equivalent to targeted temperature monitoring of areas in the display panel that may experience high temperatures. This allows for timely compensation of the chromaticity and brightness of this part of the area when temperature anomalies occur. Areas that are unlikely to experience temperature anomalies do not require monitoring units, thereby reducing the actual number of monitoring units 10 contained in the display panel and simplifying the overall structure of the display panel.

[0071] Figure 16 The diagram shown is a cross-sectional view of a display panel provided in an embodiment of the present invention, illustrating part of the structure of the pixel driving circuit and the monitoring unit. Specifically, the monitoring unit 10, including the first driving circuit 11 and the conductive unit 12, will be used as an example for further explanation. Please refer to [link / reference needed]. Figure 16 In an optional embodiment of the present invention, the display panel includes a substrate 00 and a driving layer 01 and a light-emitting layer 02 disposed on the same side of the substrate 00. The driving layer 01 is located between the light-emitting layer 02 and the substrate 00. The driving layer 01 is provided with a pixel driving circuit, and the light-emitting layer 02 is provided with a light-emitting element D0, which is electrically connected to the pixel driving circuit. The monitoring unit 10 is at least partially located in the driving layer 01. When the monitoring unit 10 is introduced into the display panel, the monitoring unit 10 is at least partially disposed in the driving layer 01. There is no need to introduce a new film layer structure for the monitoring unit 10 in the display panel; the existing film layer structure of the display panel can be reused. Therefore, it is beneficial to simplify the overall film layer structure of the display panel when the monitoring unit 10 is introduced.

[0072] It should be noted that when the monitoring unit 10 includes a first driving circuit 11, if the transistors in the first driving circuit 11 reuse the transistors in the pixel driving circuit, since the transistors in the pixel driving circuit are located in the driving layer, the monitoring unit 10 can also be considered to be at least partially located in the driving layer. When the monitoring unit 10 includes a conductive unit 12, the conductive unit 12 can also be disposed in the array layer to simplify the overall film layer structure of the display panel.

[0073] It should also be noted that, Figure 16 The cross-sectional view only illustrates the connection between a transistor in the pixel driving circuit and the light-emitting element D0, and does not limit the actual structure of the pixel driving circuit. Optionally, the light-emitting element D0 is a Micro LED. Micro LEDs are LEDs with a chip size of approximately 1μm-10μm, capable of realizing displays with pixel particles of 0.05 mm or smaller. Micro LEDs have very low power consumption, good material stability, and no image retention, making them particularly suitable for transparent display panels. Of course, in some other embodiments of the present invention, the light-emitting element D0 may also be a Mini LED or an organic electroluminescent element, and the present invention does not specifically limit this.

[0074] Please continue to refer to this. Figure 16 In an optional embodiment of the present invention, the first driving circuit 11 is located on the driving layer 01, and the conductive unit 12 is located on the side of the first driving circuit 11 away from the substrate; the conductive unit 12 and the light-emitting element D0 do not overlap along the direction perpendicular to the plane of the display panel.

[0075] Specifically, when the monitoring unit 10 includes both a first driving circuit 11 and a conductive unit 12, the first driving circuit 11 includes at least one transistor. The first driving circuit 11 can be disposed on the driving layer of the display panel without adding a new film layer to the display panel to accommodate it. This simplifies the film layer structure when introducing the first driving circuit 11 into the display panel, as no additional film layer is needed. The conductive unit 12 in the monitoring unit 10 can be located on the side of the first driving circuit 11 facing away from the substrate, facilitating connection between the conductive unit 12 and the first driving circuit 11. Furthermore, along the direction perpendicular to the plane of the substrate, the conductive unit 12 does not overlap with the light-emitting element D0, thus preventing the introduction of the conductive unit 12 from affecting the light emission of the light-emitting element D0.

[0076] Please continue to refer to this. Figure 16 In an optional embodiment of the present invention, the conductive unit 12 and the light-emitting element D0 are disposed on the same layer. When the conductive unit 12 and the light-emitting element D0 are disposed on the same layer, there is no need to introduce a new film layer structure separately for the conductive unit 12, and the number of film layers of the display panel will not increase, thus also helping to simplify the film layer structure of the display panel.

[0077] Figure 17 The image shown is another cross-sectional view of the display panel provided in an embodiment of the present invention. Please refer to [the image]. Figure 17In one optional embodiment of the present invention, the conductive unit 12 is located on the side of the light-emitting element D0 facing the first driving circuit 11. This embodiment illustrates another feasible film structure for the conductive unit 12, specifically, the conductive unit 12 is disposed on the side of the light-emitting element D0 facing the substrate. That is, the conductive unit 12 can be disposed in the film layer between the light-emitting element D0 and the transistor in the first driving circuit 11. This avoids placing the conductive unit 12 in the light-emitting direction of the light-emitting element D0, thereby avoiding interference of the conductive unit 12 with the emitted light from the light-emitting element D0.

[0078] Optionally, the array layer includes a first metal layer M1 and a second metal layer M2. The second metal layer M2 is located on the side of the first metal layer M1 facing away from the substrate 00. The gate of the transistor is located on the first metal layer M1, and the source and drain are located on the second metal layer M2. Optionally, the array layer 01 also includes a third metal layer M3 disposed on the side of the second metal layer M2 facing away from the substrate 00. This third metal layer M3 can be used, for example, to set some signal traces on the display panel. When the light guide unit 12 is disposed on the side of the light-emitting element D0 facing the substrate, the conductive unit 12 can be disposed on the third metal layer M3. In this way, there is no need to introduce a new film layer for the conductive unit 12 in the display panel, and the number of film layers in the display panel will not increase. This also helps to simplify the film layer structure of the display panel.

[0079] Please continue to refer to this. Figure 16 and Figure 17 and combined Figure 9 In an optional embodiment of the present invention, the pixel region Q0 further includes a light-emitting element D0 and a pixel driving circuit connected to the light-emitting element D0. The pixel driving circuit includes at least one low-temperature polysilicon transistor. The switching transistor K1 in the first driving circuit 11 is fabricated simultaneously with the low-temperature polysilicon transistor in the pixel driving circuit.

[0080] When the first driving circuit 11 includes a low-temperature polysilicon transistor, the low-temperature polysilicon transistor in the first driving circuit 11 can be manufactured simultaneously with the low-temperature polysilicon transistor in the pixel driving circuit. There is no need to introduce an additional manufacturing process for the low-temperature polysilicon transistor in the first driving circuit 11. Therefore, it is beneficial to simplify the overall manufacturing process of the display panel when the first driving circuit 11 is introduced into the display panel, and to improve the production efficiency of the display panel.

[0081] Figure 18 The diagram shown is a timing diagram of the pixel driving circuit and the first driving circuit 11. Please refer to it. Figure 6 , Figure 9 and Figure 18In an optional embodiment of the present invention, the working stages of the pixel driving circuit include a reset stage t1, a data writing stage t2, and a light emission stage t3. The first driving circuit 11 includes a temperature monitoring stage t4, and the temperature monitoring stage t4 and the light emission stage t3 do not overlap.

[0082] Please combine Figure 9 For the Q0 driving circuit in pixel area, during the reset phase t1, the first scan line Scan1 provides a low-level signal to the fifth transistor T5, turning on the fifth transistor T5. The reset signal is transmitted to the driving transistor T3 to reset the gate of the driving transistor T3. During the data writing phase t2, the second scan line S2 provides a low-level signal to the second transistor T2, the fourth transistor T4, and the seventh transistor T7, turning on the second transistor T2, the fourth transistor T4, and the seventh transistor T7. The data signal is written to the gate of the driving transistor T3 (or the threshold grabbing of the driving transistor T3), and the reset signal is transmitted to the fourth node N4 to reset the anode of the light-emitting element D0. During the light-emitting phase t3, the light-emitting control line EM provides a low-level signal to the first transistor T1 and the sixth transistor T6, turning on the first transistor T1 and the sixth transistor T6. The signal on the power signal line PVDD is transmitted to the driving transistor T3, and the light-emitting element D0 emits light in response to the driving signal of the driving transistor T3.

[0083] Considering that the light-emitting element D0 may experience photo-induced leakage current during the light-emitting stage, when the temperature monitoring stage t4 of the first driving circuit 11 is set to not overlap with the aforementioned light-emitting stage t3, temperature monitoring is not performed during the light-emitting stage t3. This helps to avoid the photo-induced leakage current during the light-emitting stage affecting the driving characteristics of the first driving circuit 11, thus improving the accuracy of temperature monitoring. When the temperature monitoring stage and the light-emitting stage do not overlap, the temperature monitoring stage can be set to overlap with the reset stage or the data writing stage; this invention does not specifically limit this.

[0084] Please combine Figure 2 and Figure 7 In an optional embodiment of the present invention, the display panel further includes a control chip IC, and the signal detection module 20 is integrated into the control chip IC. The two ends of the conductive unit 12 are electrically connected to the signal detection module 20 through signal traces. When the signal detection module 20 is integrated into the control chip IC, the signal changes at both ends of the conductive unit 12 can be detected through the control chip IC, which is beneficial to improving the integration of the display panel.

[0085] Continue to refer to Figure 2 , Figure 7 and combined Figures 11 to 13In an optional embodiment of the present invention, the display panel further includes a control chip IC; when the signal detection module 20 detects that the voltage or current value at both ends of the monitoring unit 10 exceeds a preset value, the control chip IC adjusts the data voltage provided to the pixel corresponding to the monitoring unit 10.

[0086] During the temperature monitoring phase, if the voltage or circuit across the monitoring unit 10 exceeds a preset value, it indicates that the temperature of the pixel area Q0 where the monitoring unit 10 is located is excessive, requiring adjustment of the chroma or brightness of that pixel area Q0. At this time, the control chip IC can adjust the data voltage supplied to the corresponding pixel area Q0 according to the temperature exceeding the limit, thereby adjusting the chroma or brightness of that pixel area Q0 and improving the color shift or brightness abnormality caused by high temperature. It should be noted that if... Figure 11 The pixel region Q0 where the monitoring unit 10 is located has only one pixel P0. When the voltage or current value across the monitoring unit 10 exceeds a preset value, the data voltage of one pixel P0 in the pixel region Q0 where the monitoring unit 10 is located is adjusted. If... Figure 12 The pixel area Q0 where the monitoring unit 10 is located includes multiple pixels P0. When the voltage or current value across the monitoring unit 10 exceeds a preset value, the data voltage of each pixel P0 in the pixel area Q0 where the monitoring unit 10 is located is adjusted. For example, if the display panel is a transparent display panel, please refer to... Figure 13 Pixel areas Q0 are isolated by transparent areas Q1. If the voltage or current across the monitoring unit 10 in a pixel area Q0 exceeds a preset value, the data voltage received by the pixel P0 in that pixel area Q0 needs to be adjusted. In other words, the overall color shift or brightness of that pixel area Q0 needs to be adjusted. If not every pixel area Q0 has a monitoring unit 10, please refer to [reference needed]. Figure 14 Each row of pixel area Q0 is equipped with only one monitoring unit 10. When the voltage or current value across a certain monitoring unit 10 exceeds a preset value, the control chip IC can adjust the data voltage of all pixels P0 in the row of pixel area Q0 where the monitoring unit 10 is located, thereby adjusting the chromaticity and brightness of each pixel in the row of pixel area Q0.

[0087] Figure 19 The diagram shown is a structural schematic of a display device provided in an embodiment of the present invention. Please refer to it. Figure 19 Based on the same inventive concept, the present invention also provides a display device 200, which includes the display panel 100 in any of the above embodiments.

[0088] The display device 200 provided in this embodiment of the invention can be any electronic device with display function, such as a touch screen, mobile phone, tablet computer, laptop computer, e-reader, or television. The display device 200 provided in this embodiment of the invention has the beneficial effects of the display panel 100 provided in this embodiment of the invention. For details, please refer to the specific descriptions of the display panel 100 in the above embodiments; these descriptions will not be repeated here.

[0089] Understandable, Figure 19 The shape of the display device 200 is illustrated using only a rounded rectangle structure as an example. In some other embodiments of the present invention, the display device 200 may also be embodied as a rectangle, a circle, an ellipse or any other feasible shape. The present invention does not specifically limit this.

[0090] As can be seen from the above embodiments, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0091] The display panel and display device provided by this invention incorporate a monitoring unit and a signal detection module. The monitoring unit includes a device composed of low-temperature polycrystalline silicon. The resistivity of low-temperature polycrystalline silicon changes with temperature. This application introduces a monitoring unit within the pixel area. When the temperature in the pixel area changes, the current or voltage corresponding to the low-temperature polycrystalline silicon will also change with the temperature. Therefore, by detecting the signal at at least one end of the monitoring unit in the pixel area through the signal detection module, the temperature change in the pixel area can be determined by the detected signal change, thereby achieving effective monitoring of the display screen temperature. Furthermore, the introduction of a monitoring unit within the pixel area enables pixel-level temperature monitoring, which is beneficial for achieving refined temperature monitoring within the display panel. When the temperature of the display screen is effectively monitored, the display data can be adjusted according to temperature changes, avoiding abnormal display problems such as color shift or abnormal brightness due to temperature changes, thus improving the overall display effect of the display panel.

[0092] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can 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

1. A display panel, characterized in that, The display panel includes a plurality of pixel areas, and each pixel area includes at least one pixel. The pixel area also includes a monitoring unit; The monitoring unit includes a conductive unit, which is made of low-temperature polycrystalline silicon material. And / or, the monitoring unit includes a first driving circuit, the first driving circuit including at least one low-temperature polycrystalline silicon transistor; The display panel also includes a signal detection module, which is used to detect the signal at least one end of the monitoring unit; The display panel includes a bonding area located on one side of the display area, the bonding area being used to bond a control chip or a flexible circuit board, the display area including a sub-display area adjacent to the bonding area, the monitoring unit being disposed only in the sub-display area, and the display panel being a transparent display panel; And / or, the monitoring unit includes the conductive unit and the first driving circuit, the display panel includes a substrate and a driving layer and a light-emitting layer disposed on the same side of the substrate, the driving layer is located between the light-emitting layer and the substrate, the light-emitting layer is provided with a light-emitting element, wherein, along the direction perpendicular to the plane of the display panel, the conductive unit and the light-emitting element do not overlap; along the direction parallel to the plane of the display panel, the conductive unit and the light-emitting element at least partially overlap, or, the driving layer includes a first metal layer, a second metal layer and a third metal layer disposed on the side of the substrate near the light-emitting layer, and along the direction parallel to the plane of the display panel, the conductive unit and the third metal layer at least partially overlap.

2. The display panel according to claim 1, characterized in that, One end of the conductive unit is connected to the first driving circuit, and the other end is connected to a fixed voltage signal terminal; the signal detection module detects the voltage or current at both ends of the conductive unit.

3. The display panel according to claim 1, characterized in that, The pixel region further includes a pixel driving circuit, wherein at least one low-temperature polysilicon transistor in the first driving circuit reuses a transistor in the pixel driving circuit.

4. The display panel according to claim 1, characterized in that, The display panel also includes a control chip, and the first driving circuit is also connected to the control chip. The control chip is used to transmit a fixed current signal to the first driving circuit, and the current value of the current signal is I, where I ≤ 0.1 μA.

5. The display panel according to claim 1, characterized in that, The resistance of the conductive unit is R1, where 10mΩ≤R1≤10000mΩ.

6. The display panel according to claim 1, characterized in that, The maximum length of the orthographic projection of a single conductive unit onto the plane of the display panel is D0, where 10μm≤D0≤100μm.

7. The display panel according to claim 1, characterized in that, The number of monitoring units contained in the display panel is less than or equal to the number of pixels.

8. The display panel according to claim 7, characterized in that, The display panel also includes a transparent area located between adjacent pixel areas, each pixel area including at least one pixel, and each pixel area is provided with a monitoring unit, or at least some of the pixel areas are not provided with a monitoring unit.

9. The display panel according to claim 7, characterized in that, The monitoring units are evenly arranged in the display area.

10. The display panel according to claim 7, characterized in that, The area of ​​the sub-display area is smaller than the area of ​​the display area.

11. The display panel according to claim 1, characterized in that, The driving layer is provided with a pixel driving circuit, and the light-emitting element is electrically connected to the pixel driving circuit; the monitoring unit is at least partially located in the driving layer.

12. The display panel according to claim 11, characterized in that, The first driving circuit is located on the driving layer, and the conductive unit is located on the side of the first driving circuit away from the substrate.

13. The display panel according to claim 12, characterized in that, The conductive unit is disposed on the same layer as the light-emitting element.

14. The display panel according to claim 12, characterized in that, The conductive unit is located on the side of the light-emitting element facing the first driving circuit.

15. The display panel according to claim 11, characterized in that, The light-emitting element is a Micro LED.

16. The display panel according to claim 1, characterized in that, The first driving circuit includes a switching transistor, which is a low-temperature polysilicon transistor; the gate of the switching transistor is electrically connected to a first control line, the first electrode is electrically connected to a first data terminal, and the second electrode is electrically connected to the conductive unit.

17. The display panel according to claim 16, characterized in that, The gates of the switching transistors in the plurality of first driving circuits are all electrically connected to the same first control line, and the first terminals of the switching transistors are all connected to the same first data terminal.

18. The display panel according to claim 16, characterized in that, The pixel region further includes a light-emitting element and a pixel driving circuit connected to the light-emitting element. The pixel driving circuit includes at least one low-temperature polysilicon transistor, and the switching transistor in the first driving circuit and the low-temperature polysilicon transistor in the pixel driving circuit are fabricated simultaneously.

19. The display panel according to claim 18, characterized in that, The operation phases of the pixel driving circuit include a reset phase, a data writing phase, and a light emission phase. The first driving circuit includes a temperature monitoring phase, and the temperature monitoring phase does not overlap with the light emission phase.

20. The display panel according to claim 1, characterized in that, The display panel also includes a control chip, the signal detection module is integrated into the control chip, and the two ends of the conductive unit are electrically connected to the signal detection module through signal traces.

21. The display panel according to claim 1, characterized in that, The display panel also includes a control chip; when the signal detection module detects that the voltage or current value at both ends of the monitoring unit exceeds a preset value, the control chip adjusts the data voltage provided to the pixel corresponding to the monitoring unit.

22. A display device, characterized in that, Includes the display panel described in any one of claims 1 to 21.

Images