Array substrate, display panel, and control method of display panel

Abstract

This invention provides an array substrate, a display panel, and a control method for the display panel. The array substrate includes a substrate, a thermistor layer, and a display layer, wherein the thermistor layer covers the substrate; the display layer is disposed on the side of the thermistor layer away from the substrate; wherein the display layer includes a display area and a non-display area, and the display area includes display pixels, and the non-display area includes virtual pixels, which are used to monitor the threshold voltage of the display pixels; wherein the thermistor layer is used to detect a first temperature of the display area to determine the current threshold voltage of the display area based on a mapping table using the first temperature; and the thermistor layer is also used to detect a second temperature of the non-display area to construct a mapping table using the second temperature and the threshold voltage. The array substrate of this application can combine temperature and threshold voltage compensation to improve the display effect after threshold voltage compensation.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to an array substrate, a display panel, and a control method for the display panel. Background Technology

[0002] In OLED display panels, pixel driving typically employs thin-film transistors (TFTs). Prolonged use of TFTs can lead to changes in carrier migration and increased activation of trapped charges, resulting in threshold voltage drift. After threshold voltage drift occurs, the TFT's on-current changes under the same gate voltage, directly causing pixel brightness degradation, image retention, and other defects.

[0003] In existing technologies, virtual pixels are designed in non-display areas such as the bezel. These virtual pixels replicate the pixels in the display area and are completely identical to them. The difference is that they are not connected to the OLED light-emitting devices; they only serve as electrical monitoring units and do not participate in image display. Threshold voltage monitoring is performed through virtual pixels, thereby enabling threshold voltage compensation.

[0004] However, the impact of threshold voltage is not only the cumulative effect of operating voltage. Studies have found that temperature also has a significant impact on threshold voltage and its drift rate. Current technology does not take into account the effect of temperature on threshold voltage, which means that even after threshold voltage compensation, the display effect still cannot meet expectations. Summary of the Invention

[0005] This invention mainly provides an array substrate, a display panel, and a control method for the display panel, which can improve the display effect.

[0006] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: to provide an array substrate, comprising: Substrate; Thermosensitive resistor layer, the thermosensitive resistor layer covers the substrate; The display layer is disposed on the side of the thermistor layer away from the substrate; wherein, the display layer includes a display area and a non-display area, and the display area is provided with display pixels, and the non-display area is provided with virtual pixels, the virtual pixels being used to monitor the threshold voltage of the display pixels; The thermistor layer is used to detect a first temperature of the display area so that the driving circuit connected to the array substrate can use the first temperature to determine the current threshold voltage of the display area based on a mapping table; and the thermistor layer is also used to detect a second temperature of the non-display area so that the driving circuit connected to the array substrate can use the second temperature and the threshold voltage to construct a mapping table.

[0007] In one embodiment, the thermistor layer includes a plurality of arrayed detection regions, each detection region including: Thermosensitive resistor; A first detection line and a second detection line are connected. The first detection line is connected to the first end of the thermistor, and the second detection line is connected to the second end of the thermistor, so that the driving circuit can detect the resistance value of the thermistor based on the first detection line and the second detection line, and determine the first temperature or the second temperature based on the resistance value of the thermistor.

[0008] In one embodiment, each detection area further includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a third detection line, and a fourth detection line; The first terminal of the first transistor is connected to the first terminal of the thermistor. The second terminal of the first transistor is connected to the first terminal of the third transistor and the first detection line. The first terminal of the second transistor is connected to the second terminal of the thermistor. The second terminal of the second transistor is connected to the first terminal of the fourth transistor and the second detection line. The second terminal of the third transistor is connected to the third detection line. The second terminal of the fourth transistor is connected to the fourth detection line. The control terminals of the first, second, third, and fourth transistors are used to connect to the drive circuit.

[0009] In one embodiment, the display layer includes a driving circuit layer and a light-emitting material layer; the array substrate further includes a buffer layer. The buffer layer is disposed on the side of the temperature-sensitive resistor layer away from the substrate. The driving circuit layer is disposed on the side of the buffer layer away from the substrate, and the driving circuit layer includes data traces; The light-emitting material layer is disposed on the side of the driving circuit layer away from the substrate.

[0010] To solve the above-mentioned technical problems, the second technical solution adopted by the present invention is: to provide a display panel, including: an array substrate and a driving circuit; The array substrate includes any of the following array substrates; The driving circuit is used to detect a first temperature of the display area using a thermistor layer, and to determine the current threshold voltage of the display area based on a mapping table using the first temperature; and to detect a second temperature of the non-display area using a thermistor layer, and to construct a mapping table using the second temperature and the threshold voltage.

[0011] To solve the above-mentioned technical problems, the third technical solution adopted by the present invention is: to provide a control method for a display panel, the method being applied to the above-mentioned display panel, the method comprising: The first temperature of the display area is detected using the thermistor layer corresponding to the display area. The current threshold voltage of the display area is determined based on the first temperature and the mapping table; Threshold voltage compensation is performed on the display area based on the current threshold voltage.

[0012] In one embodiment, before detecting the first temperature of the display area using the thermistor layer corresponding to the display area, the method further includes: The second temperature of the non-display area is obtained by detecting the temperature-sensitive resistor layer corresponding to the non-display area; and the threshold voltage of the display pixels in the display area is monitored by using the virtual pixels in the non-display area. A mapping table is constructed using the second temperature and the threshold voltage.

[0013] In one embodiment, detecting a first temperature of the display area using a thermistor layer corresponding to the display area includes: The first current resistance value of the temperature-sensitive resistor in the detection area corresponding to the display area is detected using the first target detection circuit; The first resistance value of the temperature-sensitive resistor is determined based on the first current resistance value and the first reference resistance value; wherein, the first reference resistance value is the line resistance corresponding to the first target detection line; The first temperature corresponding to the detection area is determined based on the first resistance value; The second temperature of the non-display area is obtained by detecting the temperature of the non-display area using the thermistor layer corresponding to the non-display area, including: The second target detection circuit is used to detect the second current resistance value of the temperature-sensitive resistor in the detection area corresponding to the non-display area; The second resistance value of the temperature-sensitive resistor is determined based on the second current resistance value and the second reference resistance value; wherein, the second reference resistance value is the line resistance corresponding to the second target detection line. The second temperature corresponding to the detection area is determined based on the second resistance value.

[0014] In one embodiment, the method further includes: The resistance of the first target detection line and the second target detection line is detected. The first target detection line includes any two of the first detection line, the second detection line, the third detection line and the fourth detection line. The second target detection line includes any two of the first detection line, the second detection line, the third detection line and the fourth detection line.

[0015] In one embodiment, the method further includes: In response to the first preset command, update the mapping table; In response to a second preset command, update the first reference resistance value and / or the second reference resistance value.

[0016] The beneficial effects of this invention are as follows: Unlike existing technologies, the array substrate provided by this invention includes: a substrate, a thermistor layer, and a display layer. The thermistor layer covers the substrate; the display layer is disposed on the side of the thermistor layer away from the substrate. The display layer includes a display area and a non-display area, with the display area including display pixels and the non-display area including virtual pixels. The virtual pixels are used to monitor the threshold voltage of the display pixels. The thermistor layer is used to detect a first temperature of the display area to determine the current threshold voltage of the display area based on a mapping table. The thermistor layer is also used to detect a second temperature of the non-display area to construct a mapping table using the second temperature and the threshold voltage. The array substrate of this application, with its thermistor layer, can monitor the temperature of the display area and the non-display area in real time, and determine the current threshold voltage of the display area based on the mapping relationship between the temperature of the display area and the temperature of the non-display area and the threshold voltage, thereby performing threshold voltage compensation. This combines temperature and threshold voltage compensation, improving the display effect after threshold voltage compensation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Temperature measurement graph when displaying a checkerboard pattern on an OLED display; Figure 2 A schematic diagram of displaying a checkerboard pattern on an OLED display. Figure 3 This is a schematic diagram of the temperature distribution of a virtual pixel; Figure 4 This is a schematic diagram of the structure of the first embodiment of the array substrate of this application; Figure 5 A schematic diagram of an embodiment of the temperature-sensitive resistor layer of the array substrate provided in this application; Figure 6 A schematic diagram of an embodiment of the detection area of ​​the temperature-sensitive resistor layer provided in this application; Figure 7 A schematic diagram of the structure of the two detection areas in the vertical direction of the temperature-sensitive resistor layer provided in this application; Figure 8 This is a schematic diagram of the structure of the second embodiment of the array substrate of this application; Figure 9 This is a schematic diagram of the structure of one embodiment of the display panel of this application; Figure 10This is a flowchart illustrating an embodiment of the control method for the display panel of this application; Figure 11 This is a flowchart illustrating another embodiment of the control method for the display panel of this application.

[0019] Explanation of reference numerals in the attached drawings: array substrate 10, substrate 11, thermistor layer 12, display layer 13, detection area 121, thermistor R, first detection line U1, second detection line U2, first transistor T1, second transistor T2, third transistor T3, fourth transistor T4, third detection line U3, fourth detection line U4, buffer layer 14, driving circuit layer 131, light-emitting material layer 132, driving circuit 20, display panel 100. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0022] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0024] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0025] To enable those skilled in the art to better understand the technical solution of the present invention, the display device provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In existing technologies, virtual pixels are designed in non-display areas such as the bezel. These virtual pixels replicate the pixels in the display area and are completely identical to them. The difference is that they are not connected to the OLED light-emitting devices; they only serve as electrical monitoring units and do not participate in image display. Threshold voltage monitoring is performed through virtual pixels, thereby enabling threshold voltage compensation.

[0027] However, the impact of threshold voltage is not only the cumulative effect of operating voltage. Studies have found that temperature also has a significant impact on threshold voltage and its drift rate. Current technology does not take into account the effect of temperature on threshold voltage, which means that even after threshold voltage compensation, the display effect still cannot meet expectations.

[0028] In OLED display manufacturing, the heat generation of pixels displaying different gray levels varies significantly; the higher the gray level, the more severe the heat generation. For example... Figure 1 and Figure 2 As shown, Figure 1 Temperature measurement graph for displaying a checkerboard pattern on an OLED display. Figure 2 This is a schematic diagram illustrating the display of a checkerboard pattern on an OLED screen. In the temperature measurement graph, red indicates a high temperature, corresponding to a white area with a higher grayscale within the checkerboard pattern, while blue indicates a low temperature, corresponding to a black area with a lower grayscale within the checkerboard pattern. Therefore, it is evident that pixels with higher grayscale levels have higher temperatures than pixels with lower grayscale levels.

[0029] Furthermore, taking an in-vehicle instrument panel as an example, in-vehicle displays typically show the same image. This causes the temperature in areas with a fixed high grayscale to remain consistently high. Even if the virtual pixel structure design is the same as the display pixel structure design and the applied voltage is the same, the prolonged display of a fixed grayscale leads to severe localized heating in the fixed location. Additionally, since the display pixels are surrounded by a large number of adjacent pixels, heat easily accumulates, resulting in an overall higher temperature for the display pixels. Virtual pixels, on the other hand, are mostly located in non-display areas at the edges, where they dissipate heat faster. Consequently, the actual temperature of the virtual pixels is lower than that of some high grayscale display pixels.

[0030] Furthermore, the temperature of the virtual pixels is not uniform because the Source IC (also known as the driver IC) generates heat during operation. This results in virtual pixels closer to the Source IC having a higher temperature than those farther away. Figure 3 As shown, green represents virtual pixels with higher temperatures, yellow represents virtual pixels with lower temperatures, and red represents the driver IC.

[0031] Based on the above analysis, if the temperature difference between the displayed pixel and the virtual pixel is large, using the traditional threshold voltage compensation method for threshold voltage compensation will result in poor performance.

[0032] In view of this, this application proposes an array substrate, please refer to [link to relevant documentation]. Figure 4 , Figure 4This is a schematic diagram of the structure of the first embodiment of the array substrate of this application. The array substrate 10 specifically includes: a substrate 11, a thermistor layer 12, and a display layer 13. The thermistor layer 12 covers the substrate 11, and the display layer 13 is disposed on the side of the thermistor layer 12 away from the substrate 11.

[0033] The substrate 11 can be, for example, a rigid glass substrate or a flexible substrate. It can be understood that for a rigid display panel, the substrate 11 is a rigid glass substrate; for a flexible display panel, the substrate 11 is a flexible substrate.

[0034] It should be noted that the display layer 13 includes a display area and a non-display area. The display area contains display pixels and serves as the light-emitting area of ​​the display panel, while the non-display area is used for the routing, driving, and encapsulation of the border portion. In one specific embodiment, the non-display area contains virtual pixels, which are used to monitor the threshold voltage of the display pixels and thus perform threshold voltage compensation.

[0035] The thermistor layer 12 is used to detect a first temperature of the display area, so that the driving circuit connected to the array substrate 10 uses the first temperature to determine the current threshold voltage of the display area based on a mapping table. The thermistor layer 12 is also used to detect a second temperature of the non-display area, so that the driving circuit connected to the array substrate 10 uses the second temperature and the threshold voltage to construct a mapping table.

[0036] Specifically, the thermistor layer 12 is configured to correspond to the display area and the non-display area. The thermistor layer 12 is used to detect the second temperature of the non-display area (i.e., the second temperature of the virtual pixel). The driving circuit connected to the array substrate 10 constructs a mapping table using the second temperature of the virtual pixel and the threshold voltage of the display pixel monitored by the virtual pixel. The thermistor layer 12 is also used to detect the first temperature of the display area (i.e., the first temperature of the display pixel). After detecting the first temperature of the display pixel, the mapping table is looked up using the first temperature to determine the threshold voltage corresponding to the temperature value, thus obtaining the current threshold voltage. Subsequent threshold voltage compensation is performed based on the current threshold voltage. This combines temperature and threshold voltage compensation, improving the display effect after threshold voltage compensation.

[0037] In one embodiment, combined with Figure 5 The thermistor layer 12 includes a plurality of arrayed detection areas 121. Each detection area 121 includes a thermistor R, a first detection line U1 and a second detection line U2. The first detection line U1 is connected to a first end of the thermistor R and the second detection line U2 is connected to a second end of the thermistor R, so that the driving circuit detects the resistance value of the thermistor R based on the first detection line U1 and the second detection line U2, and determines a first temperature or a second temperature based on the resistance value of the thermistor R.

[0038] It should be noted that one detection area 121 corresponds to one pixel, thus enabling pixel-by-pixel temperature detection of both the displayed pixels in the display area and the virtual pixels in the non-display area. In another embodiment, to reduce wiring and costs, one detection area 121 can correspond to multiple pixels, allowing for area-by-area temperature detection of both the display area and the non-display area.

[0039] Specifically, the resistance value of the thermistor R in each detection area 121 corresponding to the display area is detected one by one, and the first temperature of the display area is determined based on the resistance value. The resistance value of the thermistor R in each detection area 121 corresponding to the non-display area is detected one by one, and the second temperature of the non-display area is determined based on the resistance value.

[0040] Understandably, the first detection line U1 and the second detection line U2 can be connected to the drive circuit, and the drive circuit detects the resistance value of the temperature-sensitive resistor R through the first detection line U1 and the second detection line U2.

[0041] It should be noted that during temperature detection, the bonding impedance and self-impedance of the detection lines (first detection line U1 and second detection line U2) will also affect the resistance value of the thermistor R. Therefore, the influence of the bonding impedance and self-impedance of the detection lines on the thermistor R needs to be disregarded when measuring its resistance. Based on this, combined with... Figure 6 Each detection area 121 further includes: a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a third detection line U3, and a fourth detection line U4.

[0042] In this circuit, the first terminal of the first transistor T1 is connected to the first terminal of the thermistor R, the second terminal of the first transistor T1 is connected to the first terminal of the third transistor T3 and the first detection line U1, the first terminal of the second transistor T2 is connected to the second terminal of the thermistor R, the second terminal of the second transistor T2 is connected to the first terminal of the fourth transistor T4 and the second detection line U2, the second terminal of the third transistor T3 is connected to the third detection line U3, and the second terminal of the fourth transistor T4 is connected to the fourth detection line U4. The control terminals of the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 are used to connect to the drive circuit.

[0043] Wherein, the first resistor R1 represents the binding impedance and its own impedance of the first detection line U1, the second resistor R2 represents the binding impedance and its own impedance of the second detection line U2, the third resistor R3 represents the binding impedance and its own impedance of the third detection line U3, and the fourth resistor R4 represents the binding impedance and its own impedance of the fourth detection line U4.

[0044] In this embodiment, the detection area 121 can detect the binding impedance and self-impedance of each detection line. Specifically, in the initial stage, the display pixel is not powered on, the temperature is assumed to be room temperature, and the resistance value of the thermistor R is known. In this stage, the binding impedance and self-impedance of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4 are detected.

[0045] Specifically, the first step: the drive circuit controls the first transistor T1 and the second transistor T2 to turn on, and the third transistor T3 and the fourth transistor T4 to turn off, applying voltage to the first detection line U1 and the second detection line U2. At this time, the following occurs: Formula (1); in, This represents the current between the first detection line U1 and the second detection line U2. This represents the voltage between the first detection line U1 and the second detection line U2.

[0046] Step 2: The drive circuit controls the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 to all conduct, applying voltage to the third detection line U3 and the fourth detection line U4. At this time, we have: Formula (2); in, This indicates the current between the third detection line U3 and the fourth detection line U4. This indicates the voltage between the third detection line U3 and the fourth detection line U4.

[0047] Step 3: The drive circuit controls the first transistor T1, the second transistor T2, and the third transistor T3 to conduct, while the fourth transistor T4 is turned off. Voltage is applied to the third detection line U3 and the second detection line U2. At this time: Formula (3); in, This represents the current between the third detection line U3 and the second detection line U2. This represents the voltage between the third detection line U3 and the second detection line U2.

[0048] Step 4: The drive circuit controls the first transistor T1, the second transistor T2, and the third transistor T3 to turn off, and the fourth transistor T4 to turn on, applying voltage to the second detection line U2 and the fourth detection line U4. At this time, we have: Formula (4); in, This indicates the current between the second detection line U2 and the fourth detection line U4. This indicates the voltage between the second detection line U2 and the fourth detection line U4.

[0049] In the above formula, the current , , and It can be detected, and the voltage , , and Similarly, this can be obtained through detection. Combining the above formulas (1) to (4), we can obtain: Formula (5); Formula (6); Formula (7); Formula (8); The first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can be calculated using the above formulas (5) to (8). In this way, the binding impedance and self-impedance of the first detection line U1, the second detection line U2, the third detection line U3 and the fourth detection line U4 can be calculated.

[0050] The above embodiments are for a single detection area 121, for example, to detect the first detection area 121 (the detection area near the detection pin, for example). Figure 7 When the detection area is 121_a), the bonding impedance and self-impedance of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4 can be detected using the above method. However, for detection areas far from the first detection area 121 (e.g., Figure 7 For detection area 121_b), the detection trace is longer, which means that the bonding impedance and its own impedance will change. The schematic diagram for the two detection areas 121 in the vertical direction is as follows: Figure 7 As shown.

[0051] At this point, R3 and R7 are considered as a whole, denoted as R37; R1 and R5 are considered as a whole, denoted as R15; R2 and R6 are considered as a whole, denoted as R26; and R4 and R8 are considered as a whole, denoted as R48. Here, R5 represents the binding impedance and self-impedance of the first detection line U1 from the lower detection area 121 to the upper detection area 121; R6 represents the binding impedance and self-impedance of the second detection line U2 from the lower detection area 121 to the upper detection area 121; R7 represents the binding impedance and self-impedance of the third detection line U3 from the lower detection area 121 to the upper detection area 121; and R8 represents the binding impedance and self-impedance of the fourth detection line U4 from the lower detection area 121 to the upper detection area 121.

[0052] Step 1: Control T1, T2, T3, and T4 to turn off; T5 and T6 to turn on; T7 and T8 to turn off; apply voltage to the first detection line U1 and the second detection line U2. At this time: .

[0053] Step 2: Turn off T1, T2, T3, and T4; turn on T5, T6, T7, and T8 to apply voltage to the third detection line U3 and the fourth detection line U4. At this time: .

[0054] Step 3: Turn off control switches T1, T2, T3, T4, and T8; turn on T5, T6, and T7, supplying power to the third detection line U3 and the second detection line U2. At this time: .

[0055] Step 4: Turn off control circuits T1, T2, T3, T4, T5, T6, and T7, and turn on T8; send power to the fourth detection line U4 and the second detection line U2. At this time: .

[0056] The values ​​of R15, R26, R37, and R48 can be calculated using the above method.

[0057] Thus, when detecting the resistance value of the temperature-sensitive resistor R, a voltage is applied to any two of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4 to detect the resistance value of the temperature-sensitive resistor R. The actual resistance value of the temperature-sensitive resistor R can be obtained by subtracting the binding impedance and self-impedance of the corresponding detection line from the detected resistance value.

[0058] In one embodiment, assuming the resistance value of the thermocouple R in the current detection area 121_a is being detected, controllers T1 and T2 are turned on to apply detection voltages to the first detection line U1 and the second detection line U2, while simultaneously detecting the resistance value of the thermocouple R in the detection area 121_a. The actual resistance value of the thermocouple R in the detection area 121_a is calculated by subtracting the binding impedance and self-impedance (R1) of the first detection line U1 and the binding impedance and self-impedance (R2) of the second detection line U2 from the detected resistance value. As another example, controllers T1, T2, and T3 are turned on to apply detection voltages to the third detection line U3 and the second detection line U2, while simultaneously detecting the resistance value of the thermocouple R in the detection area 121_a. The actual resistance value of the thermocouple R in the detection area 121_a is calculated by subtracting the binding impedance and self-impedance (R3) of the third detection line U3 and the binding impedance and self-impedance (R2) of the second detection line U2 from the detected resistance value. Of course, the resistance value of the temperature-sensitive resistor R can also be detected through the third detection line U3 and the fourth detection line U4, or through the first detection line U1 and the fourth detection line U4. There are no specific limitations.

[0059] In another embodiment, assuming the resistance value of the thermostat R in the current detection area 121_b is being detected, control T5 and T6 to conduct, apply detection voltage to the first detection line U1 and the second detection line U2, and simultaneously detect the resistance value of the thermostat R in the detection area 121_a. The actual resistance value of the thermostat R in the detection area 121_a is calculated by subtracting the binding impedance and self-impedance of the first detection line U1 (i.e., R15) and the binding impedance and self-impedance of the second detection line U2 (i.e., R26) from the detected resistance value. As another example, control T5, T6, and T7 to conduct, apply detection voltage to the third detection line U3 and the second detection line U2, and simultaneously detect the resistance value of the thermostat R in the detection area 121_a. The actual resistance value of the thermostat R in the detection area 121_a is calculated by subtracting the binding impedance and self-impedance of the third detection line U3 (i.e., R37) and the binding impedance and self-impedance of the second detection line U2 (i.e., R26) from the detected resistance value. Of course, the resistance value of the temperature-sensitive resistor R can also be detected through the third detection line U3 and the fourth detection line U4, or through the first detection line U1 and the fourth detection line U4. There are no specific limitations.

[0060] In one embodiment, since the detection lines are also subject to pixel heating and their own heating response during long-term use, in order to improve the detection accuracy of the resistance value of the thermistor R, the bonding impedance and self-impedance of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4 are calculated periodically using the above method during the display process. It is understood that the current actual resistance value of the thermistor R can be substituted into the above formula for calculation during this process. It is also understood that a timing program is set in the system, and when the timing period is reached, the system automatically updates the bonding impedance and self-impedance of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4.

[0061] By using the above method, the binding impedance and self-impedance of the detection line can be calculated. When performing temperature detection, the temperature changes caused by the binding impedance and self-impedance of the detection line can be filtered out, which can further improve the accuracy of temperature detection, thereby improving the accuracy of threshold voltage compensation.

[0062] In one embodiment, combined with Figure 8 The display layer 13 includes a driving circuit layer 131 and a light-emitting material layer 132; the array substrate 10 also includes a buffer layer 14. The buffer layer 14 is disposed on the side of the thermistor layer 12 away from the substrate 11; the driving circuit layer 131 is disposed on the side of the buffer layer 14 away from the substrate 11, and the driving circuit layer 131 includes data traces; the light-emitting material layer 132 is disposed on the side of the driving circuit layer 131 away from the substrate 11.

[0063] It should be noted that the driving circuit layer 131 includes data traces, a pixel TFT array disposed in the display area, and a GOA (Gate On Array) driving circuit and an electrostatic discharge protection circuit disposed in the non-display area. The light-emitting material layer 132 includes effective display pixels disposed in the display area and virtual pixels disposed in the non-display area.

[0064] As mentioned above, the thermistor layer 12 is provided with detection lines. In order to avoid interference, the buffer layer 14 is used to isolate the data traces in the drive circuit layer 131 from the detection lines in the thermistor layer 12.

[0065] See Figure 9 , Figure 9This is a schematic diagram of the structure of a display panel according to an embodiment of the present application. The display panel 100 of the present application includes an array substrate 10 and a driving circuit 20. In this embodiment, the array substrate 10 is as shown in any of the above embodiments, and will not be described again here. The driving circuit 20 is connected to the array substrate 10. Specifically, in this embodiment, the driving circuit 20 detects a first temperature of the display area using the thermistor layer 12, and determines the current threshold voltage of the display area based on a mapping table using the first temperature; and detects a second temperature of the non-display area using the thermistor layer 12, and constructs a mapping table using the second temperature and the threshold voltage.

[0066] Furthermore, the display panel of this application, when detecting the resistance value of the thermistor R to determine the first temperature and the second temperature, can also filter out the influence of the bonding impedance and self-impedance of the detection line on the temperature, thereby improving the detection accuracy of the resistance value of the thermistor R, improving the temperature detection accuracy, and thus improving the threshold voltage compensation accuracy.

[0067] See Figure 10 , Figure 10 This is a flowchart illustrating an embodiment of the control method for the display panel of this application, specifically including: Step S101: Detect the first temperature of the display area using the thermistor layer corresponding to the display area.

[0068] During the display process, the first temperature of the display area is detected in real time using the thermistor layer corresponding to the display area.

[0069] In one specific embodiment, the first current resistance value of the temperature-sensitive resistor in the detection area corresponding to the display area is detected using the first target detection line; the first resistance value of the temperature-sensitive resistor is determined based on the first current resistance value and the first reference resistance value; wherein the first reference resistance value is the line resistance corresponding to the first target detection line; and the first temperature corresponding to the detection area is determined based on the first resistance value.

[0070] It should be noted that the first target detection circuit refers to the detection circuit used to detect the resistance value of the thermistor in the detection area corresponding to the display area, which is any two of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4. The first reference resistance value is the bonding impedance and its own impedance (i.e., line resistance) of the first target detection circuit.

[0071] For example, the first detection line U1 and the second detection line U2 are used as the first target detection lines. A detection voltage is applied to the first detection line U1 and the second detection line U2 in the detection area. At the same time, the first current resistance value of the temperature-sensitive resistor R is detected. The first reference resistance value (i.e., the binding impedance and self-impedance of the first detection line U1 and the binding impedance and self-impedance of the second detection line U2) is subtracted from the detected first current resistance value to calculate the first resistance value of the temperature-sensitive resistor R in the detection area corresponding to the display area. The first temperature corresponding to the display area is determined based on the first resistance value using the temperature characteristic curve of the temperature-sensitive resistor R.

[0072] Step S102: Determine the current threshold voltage of the display area based on the first temperature and the mapping table.

[0073] After obtaining the first temperature corresponding to the display area, the current threshold voltage of the display area is determined based on the first temperature and the mapping table. It should be noted that the mapping table is a mapping table between temperature and threshold voltage. Given the first temperature, the current threshold voltage corresponding to the first temperature can be looked up from the mapping table.

[0074] Step S103: Perform threshold voltage compensation on the display area based on the current threshold voltage.

[0075] After determining the current threshold voltage corresponding to the current first temperature, threshold voltage compensation is performed on the display area based on the current threshold voltage. This improves the threshold voltage compensation effect.

[0076] Combination Figure 11 , Figure 11 This is a flowchart illustrating another embodiment of the control method for the display panel of this application. In this embodiment, steps S203, S204, and S205 are the same as those described above. Figure 10 In the illustrated embodiment, steps S101, S102, and S103 are the same, except that this embodiment includes the following steps before step S203: Step S201: Detect the second temperature of the non-display area using the temperature-sensitive resistor layer corresponding to the non-display area; and monitor the threshold voltage of the display pixels in the display area using the virtual pixels in the non-display area.

[0077] During the display process, the second temperature corresponding to the non-display area is detected by the thermistor layer corresponding to the non-display area.

[0078] In one specific embodiment, the second temperature corresponding to the non-display area is detected using the detection area corresponding to the non-display area.

[0079] The second target detection circuit detects the second current resistance value of the temperature-sensitive resistor in the detection area corresponding to the non-display area; the second resistance value of the temperature-sensitive resistor is determined based on the second current resistance value and the second reference resistance value; wherein the second reference resistance value is the line resistance corresponding to the second target detection circuit; and the second temperature corresponding to the detection area is determined based on the second resistance value.

[0080] It should be noted that the second target detection circuit refers to the detection circuit used to detect the resistance value of the thermistor in the detection area corresponding to the display area. It is any two of the first detection line U1, the second detection line U2, the third detection line U3, and the fourth detection line U4. The second reference resistance value is the bonding impedance and its own impedance (i.e., line resistance) of the second target detection circuit.

[0081] For example, using the first detection line U1 and the second detection line U2 as the second target detection lines, a detection voltage is applied to the first detection line U1 and the second detection line U2 in the detection area. Simultaneously, the second current resistance value of the temperature-sensitive resistor R is detected. The second reference resistance value (i.e., the binding impedance and self-impedance of the first detection line U1 and the binding impedance and self-impedance of the second detection line U2) is subtracted from the detected second current resistance value to calculate the second resistance value of the temperature-sensitive resistor R in the detection area corresponding to the non-display area. The second temperature corresponding to the non-display area is determined based on the second resistance value using the temperature characteristic curve of the temperature-sensitive resistor R. Furthermore, the threshold voltage of the display pixels in the display area is monitored using virtual pixels in the non-display area.

[0082] Step S202: Construct a mapping table using the second temperature and threshold voltage.

[0083] A mapping table is constructed using the second temperature and the threshold voltage. It should be noted that the mapping table can characterize the relationship between temperature and threshold voltage.

[0084] In one embodiment, the mapping table is updated in response to a first preset instruction. It is understood that the mapping relationship between temperature and threshold voltage may change due to factors such as product aging; therefore, periodically updating the mapping table can improve the accuracy of threshold voltage compensation and enhance the display effect.

[0085] It should be noted that the control scheme of this application also includes: detecting the line resistance corresponding to the first target detection line and the second target detection line; the first target detection line includes any two of the first detection line, the second detection line, the third detection line and the fourth detection line, and the second target detection line includes any two of the first detection line, the second detection line, the third detection line and the fourth detection line.

[0086] The method for detecting the line resistance of the first target detection line and the second target detection line is as described in the above embodiment, and will not be repeated here.

[0087] In one embodiment, since the detection lines are also subject to pixel heating and their own heating response during long-term use, in order to improve the detection accuracy of the resistance value of the temperature-sensitive resistor R, during the display process, in response to the second preset command, the bonding impedance and self-impedance of the first detection line U1, the second detection line U2, the third detection line U3 and the fourth detection line U4 are recalculated, thereby updating the first reference resistance value and / or the second reference resistance value.

[0088] The display panel control method of this application can monitor the temperature of the display area and non-display area in real time, and determine the current threshold voltage of the display area based on the temperature of the display area and the mapping relationship between the temperature of the non-display area and the threshold voltage, thereby performing threshold voltage compensation. This combines temperature and threshold voltage compensation to improve the display effect after threshold voltage compensation.

[0089] The above are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An array substrate, characterized by, include: Substrate; A temperature-sensitive resistor layer, wherein the temperature-sensitive resistor layer covers the substrate; A display layer is disposed on the side of the temperature-sensitive resistor layer away from the substrate; wherein the display layer includes a display area and a non-display area, the display area is provided with display pixels, and the non-display area is provided with virtual pixels, the virtual pixels being used to monitor the threshold voltage of the display pixels; The temperature-sensitive resistor layer is used to detect a first temperature of the display area, so that the driving circuit connected to the array substrate uses the first temperature to determine the current threshold voltage of the display area based on a mapping table; and the temperature-sensitive resistor layer is also used to detect a second temperature of the non-display area, so that the driving circuit connected to the array substrate uses the second temperature and the threshold voltage to construct the mapping table.

2. The array substrate of claim 1, wherein, The temperature-sensitive resistor layer includes a plurality of arrayed detection regions, each of which includes: Thermosensitive resistor; A first detection line and a second detection line are connected, the first detection line being connected to a first end of the temperature-sensitive resistor and the second detection line being connected to a second end of the temperature-sensitive resistor, so that the driving circuit detects the resistance value of the temperature-sensitive resistor based on the first detection line and the second detection line, and determines the first temperature or the second temperature based on the resistance value of the temperature-sensitive resistor.

3. The array substrate of claim 2, wherein, Each of the detection areas further includes: a first transistor, a second transistor, a third transistor, a fourth transistor, a third detection line, and a fourth detection line; The first terminal of the first transistor is connected to the first terminal of the thermistor. The second terminal of the first transistor is connected to the first terminal of the third transistor and the first detection line. The first terminal of the second transistor is connected to the second terminal of the thermistor. The second terminal of the second transistor is connected to the first terminal of the fourth transistor and the second detection line. The second terminal of the third transistor is connected to the third detection line. The second terminal of the fourth transistor is connected to the fourth detection line. The control terminals of the first, second, third, and fourth transistors are used to connect to the driving circuit.

4. The array substrate of claim 1, wherein, The display layer includes a driving circuit layer and a light-emitting material layer; the array substrate further includes a buffer layer. The buffer layer is disposed on the side of the temperature-sensitive resistor layer away from the substrate. The driving circuit layer is disposed on the side of the buffer layer away from the substrate, and the driving circuit layer includes data traces; The light-emitting material layer is disposed on the side of the driving circuit layer away from the substrate.

5. A display panel, characterized by, include: Array substrate and driving circuit; The array substrate includes the array substrate described in any one of claims 1 to 4 above; The driving circuit is used to detect a first temperature of the display area using the thermistor layer, and to determine the current threshold voltage of the display area based on a mapping table using the first temperature; and to detect a second temperature of the non-display area using the thermistor layer, and to construct the mapping table using the second temperature and the threshold voltage.

6. A control method of a display panel, characterized by, The method is applied to the display panel according to claim 5, and the method includes: The first temperature of the display area is detected using the temperature-sensitive resistor layer corresponding to the display area. The current threshold voltage of the display area is determined based on the first temperature and the mapping table; Threshold voltage compensation is performed on the display area based on the current threshold voltage.

7. The method according to claim 6, characterized in that, Before detecting the first temperature of the display area using the thermistor layer corresponding to the display area, the method further includes: The second temperature of the non-display area is obtained by detecting the temperature-sensitive resistor layer corresponding to the non-display area; and the threshold voltage of the display pixels in the display area is monitored by using the virtual pixels in the non-display area. The mapping table is constructed using the second temperature and the threshold voltage.

8. The method according to claim 7, characterized in that, Detecting a first temperature of the display area using the thermistor layer corresponding to the display area includes: The first target detection circuit is used to detect the first current resistance value of the temperature-sensitive resistor in the detection area corresponding to the display area; The first resistance value of the temperature-sensitive resistor is determined based on the first current resistance value and the first reference resistance value; wherein, the first reference resistance value is the line resistance corresponding to the first target detection line; The first temperature corresponding to the detection area is determined based on the first resistance value; The second temperature of the non-display area is detected using the thermistor layer corresponding to the non-display area, including: The second target detection circuit is used to detect the second current resistance value of the temperature-sensitive resistor in the detection area corresponding to the non-display area; The second resistance value of the temperature-sensitive resistor is determined based on the second current resistance value and the second reference resistance value; wherein, the second reference resistance value is the line resistance corresponding to the second target detection circuit; The second temperature corresponding to the detection area is determined based on the second resistance value.

9. The method according to claim 8, characterized in that, The method further includes: The resistance of the first target detection line and the second target detection line is detected. The first target detection line includes any two of the first detection line, the second detection line, the third detection line and the fourth detection line. The second target detection line includes any two of the first detection line, the second detection line, the third detection line and the fourth detection line.

10. The method according to claim 9, characterized in that, The method further includes: In response to the first preset instruction, update the mapping table; In response to a second preset command, update the first reference resistance value and / or the second reference resistance value.

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