Display device and display apparatus

Abstract

The invention discloses a display device and display equipment, and relates to the field of display, the display device comprises a temperature monitoring unit, a heating control unit, a heating unit, a pixel driving circuit and a level conversion unit; the input end of the temperature monitoring unit is connected with the level conversion unit, the output end of the temperature monitoring unit is connected with the input end of the heating control unit, the output end of the heating control unit is connected with the first end of the heating unit, and the second end of the heating unit is connected with the pixel driving circuit; the temperature monitoring unit is conducted under the condition of receiving a frame starting signal output by the level conversion unit, and the conduction current of the temperature monitoring unit is in positive correlation with the temperature; the heating control unit is conducted under the condition that the conduction current of the temperature monitoring unit is smaller than or equal to a preset current threshold value, and the heating unit is used for heating the pixel driving circuit under the condition that the heating control unit is conducted. The problem that transverse grain display is abnormal due to the fact that the performance of a TFT is poor in a low-temperature environment is solved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to display devices and display equipment. Background Technology

[0002] In the field of display technology, TFT (Thin-Film Transistor) is the core driving element of liquid crystal display panel. In low temperature environment (0~-20℃), the thermal mobility of TFT carriers will be weakened, and at the same time, interface defects and lattice scattering phenomena will be aggravated. These factors work together to reduce the mobility of TFT. The reduction in mobility makes it impossible for TFT to fully open at low temperature, which often leads to the phenomenon of abnormal horizontal stripes in the display.

[0003] Currently, to address the impact of low-temperature environments on TFT performance, NTC (Negative Temperature Coefficient) resistors are typically placed on the PCBA (Printed Circuit Board Assembly) to detect temperature changes. Upon detecting a low-temperature environment, the driving capability is increased by raising the VGH (Gate High Voltage) to force the TFT to turn on. However, the VGH voltage has an upper limit, and in low-temperature environments, there are still cases where the TFT cannot be effectively turned on, failing to resolve the problem of horizontal stripe display abnormalities caused by poor TFT performance at low temperatures.

[0004] The above content is only used to help understand the technical solutions of the embodiments of this application, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this application is to provide a display device and display equipment to solve the problem of abnormal horizontal stripe display caused by the poor performance of TFT in low-temperature environments.

[0006] To achieve the above objectives, this application provides a display device, which includes: a temperature monitoring unit, a heating control unit, a heating unit, a pixel driving circuit, and a level conversion unit; The input terminal of the temperature monitoring unit is connected to the level conversion unit, the output terminal of the temperature monitoring unit is connected to the input terminal of the heating control unit, the output terminal of the heating control unit is connected to the first terminal of the heating unit, and the second terminal of the heating unit is connected to the pixel driving circuit. The temperature monitoring unit is turned on when it receives the start signal of the output frame from the level conversion unit, and the conduction current of the temperature monitoring unit is positively correlated with the temperature. The heating control unit is turned on when the conduction current of the temperature monitoring unit is less than or equal to a preset current threshold, and the heating unit is used to heat the pixel driving circuit when the heating control unit is turned on.

[0007] In one embodiment, the temperature monitoring unit includes a constant current source, a pull-down resistor, and a detection switch unit. The detection switch unit includes at least one detection switch transistor. When the detection switch unit includes at least two detection switch transistors, the at least two detection switch transistors are connected in parallel. The conduction current of the detection switch unit is positively correlated with the temperature. The control terminal of the detection switch unit is used as the input terminal of the temperature monitoring unit. The control terminal of the detection switch unit is connected to the port of the level conversion unit that outputs the frame start signal, and the first terminal of the pull-down resistor. The second terminal of the pull-down resistor is connected to a preset common voltage. The first end of the detection switch unit is connected to a constant current source, and the second end of the detection switch unit is used as the output end of the temperature monitoring unit.

[0008] In one embodiment, the heating control unit includes a heating switch transistor, a reset switch transistor, a first capacitor, and a first resistor; Both the first end of the first resistor and the first end of the heating switch tube are used as input terminals of the heating control unit, and the second end of the first resistor is connected to a preset common voltage. The first terminal of the reset switch is connected to the port of the level conversion unit that outputs the frame reset signal, the second terminal of the reset switch is connected to a preset voltage, and the third terminal of the reset switch is connected to the first terminal of the heating switch. The first end of the first capacitor is connected to the first end of the heating switch tube, and the second end of the first capacitor is connected to a preset common voltage. The second end of the heating switch tube is used as the output end of the heating control unit.

[0009] In one embodiment, when the conduction current of the temperature monitoring unit is less than or equal to a preset current threshold, the voltage across the first resistor decreases, causing the heating switch tube to conduct, thereby turning on the heating control unit. When the reset switch receives a frame reset signal, the reset switch is turned on. When the reset switch is turned on, the voltage of the first capacitor is reset so that the heating switch is turned off. When the heating switch is turned off, the heating control unit is turned off.

[0010] In one embodiment, the display device further includes a voltage follower, a first input terminal of which is connected to the output terminal of the voltage follower, a second input terminal of which is connected to a preset following voltage, and an output terminal of which is connected to the third terminal of the heating switch tube in the heating control unit.

[0011] In one embodiment, the display device further includes an isolating switch transistor, the first end of which is connected to the first end of the first resistor, the second end of which is connected to the output terminal of the voltage follower, and the third end of which is connected to the third end of the heating switch transistor. When the conduction current of the detection switch unit is greater than a preset current threshold, the isolation switch is turned off to cut off the current output from the voltage follower to the heating switch.

[0012] In one embodiment, the display device further includes a display panel, and the heating unit includes at least one heating component, which is a heating resistor or a transparent conductive trace within the display panel. When the heating unit includes at least two heating resistors, the at least two heating resistors are connected in parallel. The first end of the heating component is connected to the output end of the heating control unit, and the second end of the heating component is connected to the pixel driving circuit.

[0013] In one embodiment, a plurality of first target detection pixels are defined in the display panel. The first target detection pixels are pixels in even-numbered rows and even-numbered columns or pixels in odd-numbered columns and odd-numbered rows in the display panel. Each first target detection pixel is provided with a detection switch unit in a temperature monitoring unit. The pixel driving circuit of the first pixels in the display panel other than the first target detection pixels is connected to a heating unit. Different first pixels are connected to different heating units. The heating control unit is set in any pixel in the display panel. The heating units set in the first pixels are all connected to the heating control unit. The plurality of detection switch units in the display panel are connected in parallel. Alternatively, multiple target local pixels are determined in the display panel, and each target local pixel is provided with the detection switch unit and the heating unit. The heating unit is connected to the pixel driving circuit of the target local pixel. The target local pixel is any pixel in the display panel. Any two target local pixels are not adjacent. The heating control unit is set in any pixel of the display panel. The multiple detection switch units in the display panel are connected in parallel. Alternatively, a second target detection pixel is determined in the display panel, the temperature monitoring unit and the heating control unit are disposed in the second target detection pixel, and the pixel driving circuit of each second pixel in the display panel other than the second target detection pixel is connected to a heating unit. The heating units connected to different second pixels are different, and the heating unit in each second pixel is connected to the heating control unit in the second target detection pixel.

[0014] In one embodiment, the pixel driving circuit is a first driving circuit or a second driving circuit, and the display device further includes a power management unit; The first driving circuit includes a first switching transistor, a second switching transistor, a light-emitting device, and a first storage capacitor. The first end of the first switching transistor is connected to the gate line in the display panel, the second end of the first switching transistor is connected to the data line in the display panel, the third end of the first switching transistor is connected to the first end of the second switching transistor and the first end of the first storage capacitor, the second end of the second switching transistor is connected to the anode of the light-emitting device, the cathode of the light-emitting device is connected to a preset common voltage, the third end of the second switching transistor is connected to the power management unit, and the second end of the first storage capacitor is connected to the second input terminal of the voltage follower in the display device. The second driving circuit includes a third switching transistor, a liquid crystal capacitor, a parasitic capacitor, and a second storage capacitor. The first end of the third switching transistor and the first end of the parasitic capacitor are connected to the gate line. The second end of the third switching transistor is connected to the data line. The third end of the third switching transistor is connected to the second end of the parasitic capacitor, the first end of the storage capacitor, and the first end of the liquid crystal capacitor. The second end of the storage capacitor and the second end of the liquid crystal capacitor are connected to a preset common voltage.

[0015] In addition, to achieve the above objectives, this application also provides a display device, which is a display apparatus as described above.

[0016] One or more technical solutions proposed in the embodiments of this application have at least the following technical effects: The display device of this application includes a temperature monitoring unit, a heating control unit, a heating unit, a pixel driving circuit, and a level conversion unit; the input terminal of the temperature monitoring unit is connected to the level conversion unit, the output terminal of the temperature monitoring unit is connected to the input terminal of the heating control unit, the output terminal of the heating control unit is connected to the heating unit, and the heating unit is connected to the pixel driving circuit.

[0017] Since the temperature monitoring unit is turned on when it receives the frame start signal output by the level conversion unit, it is equivalent to the temperature monitoring unit being turned on when the display device needs to display. The conduction current of the temperature monitoring unit is positively correlated with the temperature. Therefore, when the display device needs to display, the conduction current of the temperature monitoring unit will decrease as the temperature decreases. The heating control unit in this application will be turned on when the conduction current of the temperature monitoring unit decreases to a preset current threshold, thereby realizing the conduction of the heating control unit in a low-temperature environment. The heating unit can heat the pixel driving circuit when the heating control unit is turned on. Thus, this embodiment can automatically start the heating unit to heat the pixel driving circuit in a low-temperature environment, thereby preventing the problem of abnormal horizontal stripe display caused by the poor performance of TFT in a low-temperature environment. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with those of this application and, together with the specification, serve to explain the principles of the embodiments of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram illustrating the abnormal horizontal stripes displayed on a display device; Figure 2 This is a schematic diagram of a module in one embodiment of the display device according to the present application; Figure 3 This is a schematic diagram of the temperature monitoring unit in the display device according to an embodiment of this application; Figure 4 This is a schematic diagram showing the curve of the on-state current of the detection switch transistor in the display device according to an embodiment of this application as a function of temperature; Figure 5 This is a schematic diagram of the circuit connection of the temperature monitoring unit module in the display device of this application, where the number of detection switch transistors is 1. Figure 6 This is a schematic diagram of the circuit connection of the temperature monitoring unit module in the display device according to an embodiment of the present application, which includes multiple detection switching transistors; Figure 7 This is a circuit diagram of the heating control unit in the display device according to an embodiment of this application; Figure 8 This is a circuit diagram of a display device including a voltage follower, as described in an embodiment of this application. Figure 9This is a circuit diagram of a display device including an isolating switch transistor, as shown in an embodiment of this application. Figure 10 This is a circuit diagram showing that the heating unit in the display device according to an embodiment of the present application includes a heating resistor; Figure 11 This is a circuit diagram showing that the heating unit in the display device according to an embodiment of the present application includes multiple heating resistors; Figure 12 This is a schematic diagram of a first layout embodiment of the detection switch unit and heating component in the display device according to an embodiment of this application; Figure 13 This is a schematic diagram of a second layout embodiment of the detection switch unit and heating assembly in the display device according to an embodiment of this application; Figure 14 This is a schematic diagram of a third layout implementation of the detection switch unit and heating assembly in the display device according to an embodiment of this application; Figure 15 This is a schematic diagram of the circuit connection of the pixel driving circuit as the first driving circuit in the display device of the embodiment of this application; Figure 16 This is a schematic diagram of the circuit connection of the pixel driving circuit as the second driving circuit in the display device of the embodiment of this application; Figure 17 This is a waveform diagram of the STV (Start Vertical Signal), RST (Reset Signal), and CK (Clock Signal) signals in the display device of this application embodiment.

[0021] Explanation of icon numbers: 100 Temperature monitoring unit; 200 Heating control unit; 300 Heating unit; 400 Pixel driving circuit; 500 Level conversion unit; 110 Detection switch unit; 600 Power management unit; Q1, constant current source; RX, pull-down resistor; Vu, preset common voltage; Tz1, detection switch; Tz1~Tzn, multiple detection switches; R1, first resistor; Tc, reset switch; Tf, heating switch; C1, first capacitor; VCC, preset voltage; OP1, voltage follower; Vg, preset follower voltage; Tg, isolation switch; Rs1, heating resistor; Rs1~Rsm, multiple heating resistors; T1, first switching transistor; T2, second switching transistor; T3, third switching transistor; D1, light-emitting device; Cs, first storage capacitor; Cst, second storage capacitor; Cgs, parasitic capacitance; Clc, liquid crystal capacitor; VCOM, common electrode.

[0022] The objectives, features, and advantages of the embodiments described in this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the embodiments of this application and are not intended to limit the embodiments of this application.

[0024] To better understand the technical solutions of the embodiments of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0025] In the field of display technology, TFTs (Thin Film Transistors) are the core driving components of liquid crystal display panels. At low temperatures (0~-20℃), the thermal mobility of TFT carriers weakens, while interface defects and lattice scattering intensify. These factors combined lead to a decrease in TFT mobility. This reduced mobility prevents the TFT from fully opening at low temperatures, often resulting in abnormal horizontal stripes on the display. For example, refer to... Figure 1 , Figure 1 The diagram illustrates an abnormal horizontal stripe pattern on the display screen. Furthermore, in TFTs fabricated using the low-temperature solution method, the thin film quality may be poor, leading to an increased off-state current. This can affect the stability of the TFT switch, making it more susceptible to horizontal stripe abnormalities. Additionally, at low temperatures, the contact barrier between the metal electrode and the semiconductor channel may increase, resulting in a significant increase in contact resistance, affecting driving capability, and also easily leading to horizontal stripe abnormalities.

[0026] Currently, to address the impact of low temperatures on TFT performance, NTC resistors are typically placed on the PCBA to detect temperature changes. Once a low-temperature environment is detected, the VGH voltage is increased to enhance the driving capability and activate the TFT. However, there is an upper limit to the VGH voltage. In low-temperature environments, there are still cases where the TFT cannot be effectively activated, failing to resolve the issue of horizontal stripe display abnormalities caused by poor TFT performance at low temperatures. For example, the current temperature compensation voltage is 35V (30V at room temperature), but there are still cases where the TFT fails to activate even at 35V, requiring a VGH increase to 40V or even 45V. This places significant demands on the POWER IC (Power Integrated Circuit) and LS IC (Level Shifter Integrated Circuit). High-voltage ICs require customization, which is unfriendly in terms of selection and cost. Furthermore, the current standard minimum temperature is generally -20℃. For industrial control or other specially customized products, the application temperature may be even lower, making it even more impossible to solve the horizontal stripe problem simply by increasing the VGH voltage. Furthermore, since PCBAs are usually folded to the back of the backlight, and the backlight temperature is very high, it will affect the change of NTC resistors, making it difficult to accurately determine the ambient temperature, which can easily lead to temperature compensation failure.

[0027] Therefore, this embodiment provides a display device, which includes a temperature monitoring unit, a heating control unit, a heating unit, a pixel driving circuit, and a level conversion unit; the input terminal of the temperature monitoring unit is connected to the level conversion unit, the output terminal of the temperature monitoring unit is connected to the input terminal of the heating control unit, the output terminal of the heating control unit is connected to the heating unit, and the heating unit is connected to the pixel driving circuit.

[0028] Since the temperature monitoring unit is turned on when it receives the frame start signal output by the level conversion unit, it is equivalent to the temperature monitoring unit being turned on when the display device needs to display. The conduction current of the temperature monitoring unit is positively correlated with the temperature. Therefore, when the display device needs to display, the conduction current of the temperature monitoring unit will decrease as the temperature decreases. In this embodiment, the heating control unit will be turned on when the conduction current of the temperature monitoring unit decreases to a preset current threshold, thereby realizing the conduction of the heating control unit in a low-temperature environment. The heating unit can heat the pixel driving circuit when the heating control unit is turned on. Thus, in this embodiment, the heating unit can be automatically started to heat the pixel driving circuit in a low-temperature environment. As a result, the TFT performs poorly in a low-temperature environment, leading to the problem of abnormal horizontal stripe display.

[0029] Furthermore, in this embodiment, the switching transistor in the temperature monitoring unit can be placed inside the display panel instead of on the PCBA board, thereby avoiding the problem of inaccurate temperature monitoring caused by excessive backlight temperature. Since the TFT of the pixel is also placed inside the display panel, the temperature reflected by the temperature monitoring unit can be closer to the temperature of the TFT in the pixel, thereby improving the accuracy of heating the TFT in the pixel and effectively solving the problem of horizontal stripe abnormality.

[0030] Based on this, embodiments of this application provide a display device, referring to... Figure 2 , Figure 2 This is a schematic diagram of the display device modules, which includes: a temperature monitoring unit 100, a heating control unit 200, a heating unit 300, a pixel driving circuit 400, and a level conversion unit 500; The input terminal of the temperature monitoring unit 100 is connected to the level conversion unit 500, the output terminal of the temperature monitoring unit 100 is connected to the input terminal of the heating control unit 200, the output terminal of the heating control unit 200 is connected to the first terminal of the heating unit 300, and the second terminal of the heating unit 300 is connected to the pixel driving circuit 400. The temperature monitoring unit 100 is turned on when it receives the output frame start signal from the level conversion unit 500, and the conduction current of the temperature monitoring unit 100 is positively correlated with the temperature. The heating control unit 200 is turned on when the conduction current of the temperature monitoring unit 100 is less than or equal to a preset current threshold. The heating unit 300 is used to heat the pixel driving circuit 400 when the heating control unit 200 is turned on.

[0031] It should be noted that the temperature monitoring unit 100 includes a switching transistor. The conduction current of the switching transistor in the temperature monitoring unit 100 is positively correlated with temperature; that is, the higher the temperature, the higher the conduction current, and the lower the temperature, the lower the conduction current. Therefore, the ambient temperature can be reflected by the conduction current of the switching transistor in the temperature monitoring unit 100. The heating control unit 200 can control whether the heating unit 300 heats up. When the heating control unit 200 is turned on, the heating unit 300 can generate heat, thereby heating the pixel driving circuit 400. When the heating control unit 200 is turned off, the heating unit 300 does not heat up, thus preventing the pixel driving circuit 400 from overheating.

[0032] Whether the heating control unit 200 is turned on is related to the conduction current of the temperature monitoring unit 100. When the conduction current of the temperature monitoring unit 100 is less than or equal to a preset current threshold, the heating control unit 200 is turned on. The preset current threshold can be set based on actual conditions, and this embodiment does not make specific limitations on it. For example, the preset current threshold can be the conduction current of the switching transistor in the temperature monitoring unit 100 at a preset low temperature threshold. The preset low temperature threshold can be set based on actual conditions, and this embodiment does not make specific limitations on it. For example, the preset low temperature threshold can be 0 degrees Celsius, -1 degrees Celsius, etc., and this embodiment does not make specific limitations on it.

[0033] The pixel driving circuit 400 contains TFTs. The heating unit 300 can heat the pixel driving circuit 400 in a low-temperature environment. When the heating unit 300 is heating, it can remove the TFTs in the pixel driving circuit 400 from the low-temperature environment, thereby preventing the TFTs from exhibiting poor performance due to excessively low ambient temperature, which could lead to abnormal horizontal stripes. The closer the heating unit 300 is to the TFTs in the pixel driving circuit 400, the better the heating effect. The pixel driving circuit 400 can be an OLED (Organic Light-Emitting Diode) circuit or a TFT-LCD (Thin-Film Transistor Liquid Crystal Display) circuit; this embodiment does not specifically limit it.

[0034] The level conversion unit 500 can be an LS, and the frame start signal is an STV signal, which is the start signal for the display of an image frame. When the temperature monitoring unit 100 receives the frame start signal output by the level conversion unit 500, the temperature monitoring unit 100 is turned on. Specifically, the temperature monitoring unit 100 is turned on during the period when the frame start signal is at a high level.

[0035] In this embodiment, the display device further includes a display panel. The switching transistor in the temperature monitoring unit 100 is disposed within the display panel. The heating unit 300 and the heating control unit 200 may also be disposed within the display panel. The display panel contains multiple pixels, each with a pixel driving circuit 400 used to drive the pixel for display. Because the switching transistor in the temperature monitoring unit 100 is disposed within the display panel in this embodiment, it is easier to more accurately reflect the temperature of the TFT in the pixel driving circuit 400, thereby enabling more accurate heating of the pixel driving circuit 400.

[0036] Since the temperature monitoring unit 100 in this embodiment is turned on when it receives the frame start signal output by the level conversion unit 500, it is equivalent to the temperature monitoring unit 100 being turned on when the display device needs to display. The conduction current of the temperature monitoring unit 100 is positively correlated with the temperature. Therefore, when the display device needs to display, the conduction current of the temperature monitoring unit 100 will decrease as the temperature decreases. The heating control unit 200 in this embodiment will be turned on when the conduction current of the temperature monitoring unit 100 decreases to a preset current threshold, thereby realizing the conduction of the heating control unit 200 in a low-temperature environment. The heating unit 300 can heat the pixel driving circuit 400 when the heating control unit 200 is turned on. Thus, in this embodiment, the heating unit 300 can be automatically started to heat the pixel driving circuit 400 in a low-temperature environment. As a result, the horizontal stripe display abnormality occurs due to the poor performance of TFT in a low-temperature environment.

[0037] In one feasible embodiment, please refer to Figure 3 The temperature monitoring unit 100 includes a constant current source Q1, a pull-down resistor RX, and a detection switch unit 110. The detection switch unit 110 includes at least one detection switch transistor Tz1. When the detection switch unit 110 includes at least two detection switch transistors, the at least two detection switch transistors are connected in parallel. The conduction current of the detection switch unit 110 is positively correlated with the temperature. The control terminal of the detection switch unit 110 is used as the input terminal of the temperature monitoring unit 100. The control terminal of the detection switch unit 110 is connected to the port of the level conversion unit 500 that outputs the frame start signal, and the first terminal of the pull-down resistor RX. The second terminal of the pull-down resistor RX is connected to the preset common voltage Vu. The first end of the detection switch unit 110 is connected to the constant current source Q1, and the second end of the detection switch unit 110 is used as the output end of the temperature monitoring unit 100.

[0038] It should be noted that the constant current source Q1 can be placed on the PCBA board of the display device to reduce the space occupied within the display panel. The size of the constant current source Q1 can be set based on the actual situation. For example, the size of the constant current source Q1 can be set based on the specifications of the level conversion unit 500. This embodiment does not impose specific limitations on this. For example, the size of the constant current source Q1 can be set to 20uA. The switching transistor in the temperature monitoring unit 100 is the detection switching transistor Tz1, which is an NMOS transistor. The temperature monitoring unit 100 may include one or more detection switching transistors. In the case of multiple detection switching transistors, the multiple detection switching transistors are connected in parallel.

[0039] The control terminal of the detection switch unit 110 is the gate of the detection switch transistor Tz1, the first terminal of the detection switch unit 110 is the drain of the detection switch transistor Tz1, and the second terminal of the detection switch unit 110 is the source of the detection switch transistor Tz1. Among the multiple detection switches connected in parallel, the sources of each detection switch transistor are connected to each other, the drains of each detection switch transistor are connected to each other, and the gates of each detection switch transistor are all connected to the port of the level conversion unit 500 that outputs the frame start signal.

[0040] The on-current of the detection switch Tz1 changes with temperature; for example, refer to... Figure 4 , Figure 4 This diagram illustrates the curve of the on-current of the detection switch Tz1 as a function of temperature. Figure 4 As can be seen, the lower the temperature, the smaller the current. Figure 3 The current in the current converter can be the on-state current of the detection switch Tz1. Multiple detection switches can be connected in parallel to flexibly change the current magnitude. In other embodiments, multiple detection switches can also be connected in series, which also flexibly changes the current magnitude. This embodiment does not specifically limit this; the specific configuration can be based on actual conditions. For example, refer to... Figure 5 , Figure 5 The circuit diagram shown illustrates that the number of detection switch transistors in the detection switch unit 110 is 1. Figure 6 A circuit diagram showing the detection switch unit 110, which includes multiple detection switch transistors, is presented. Figure 6 In this example, n can be a positive integer. This embodiment does not impose a specific limitation on the size of n. Figure 6 The image shows n detection switches. Figure 6 Tz1~Tzn in the text refers to multiple detection switch transistors.

[0041] The pull-down resistor RX can also be placed on the PCBA board to reduce the space occupied within the display panel. In other embodiments, the pull-down resistor RX can also be placed inside the display panel; this embodiment does not specifically limit this. The pull-down resistor RX is used to speed up the turn-off time of the STV signal, so as to improve the accuracy of subsequent heating of the pixel driving circuit 400.

[0042] In this embodiment, the detection switch Tz1 in the detection switch unit 110 is turned on when it receives the STV signal, specifically when the STV signal is at a high level. When the conduction current of the detection switch unit 110 is less than or equal to a preset current threshold, the heating control unit 200 is turned on; when the conduction current of the detection switch unit 110 is greater than the preset current threshold, the heating control unit 200 is turned off. When the conduction current of the detection switch unit 110 is greater than the preset current threshold, it indicates that the pixel driving circuit 400 is not in a low-temperature environment, and heating of the pixel driving circuit 400 is not required. Therefore, the heating control unit 200 can be turned off, and consequently, the heating unit 300 will not heat the pixel driving circuit 400.

[0043] In this embodiment, the temperature change is reflected by the conduction current of the detection switch unit 110. The detection switch unit 110 can be set inside the display panel, so there is no need to monitor the temperature change through a temperature sensor, which can improve the accuracy of heating. Since the heating control unit 200 will naturally turn on when the conduction current of the detection switch unit 110 is less than or equal to a preset current threshold, the heating efficiency can be improved. In low-temperature environments, the pixel driving circuit 400 can be heated in time to effectively eliminate the phenomenon of horizontal stripes.

[0044] In one feasible embodiment, please refer to Figure 7 The heating control unit 200 includes a heating switch transistor Tf, a reset switch transistor Tc, a first capacitor C1, and a first resistor R1. Both the first end of the first resistor R1 and the first end of the heating switch Tf are used as input terminals of the heating control unit 200, and the second end of the first resistor R1 is connected to the preset common voltage Vu. The first terminal of the reset switch transistor Tc is connected to the port of the level conversion unit 500 that outputs the frame reset signal, the second terminal of the reset switch transistor Tc is connected to the preset voltage VCC, and the third terminal of the reset switch transistor Tc is connected to the first terminal of the heating switch transistor Tf. The first terminal of the first capacitor C1 is connected to the first terminal of the heating switch transistor Tf, and the second terminal of the first capacitor C1 is connected to the preset common voltage Vu. The second terminal of the heating switch transistor Tf is used as the output terminal of the heating control unit 200.

[0045] It should be noted that the heating switch Tf is a PMOS transistor, while the reset switch Tc can be an NMOS transistor. The heating switch Tf can be turned on when the on-state current of the detection switch unit 110 is less than or equal to a preset current threshold. In this embodiment, the on-state of the heating switch Tf indicates that the heating control unit 200 is on, and the off-state of the heating switch Tf indicates that the heating control unit 200 is off.

[0046] The value of the first resistor R1 can be set based on actual conditions so that when the on-current of the temperature monitoring unit 100 is less than or equal to a preset current threshold, the voltage across the first resistor R1 turns on the heating switch transistor Tf; when the on-current of the temperature monitoring unit 100 is greater than the preset current threshold, the voltage across the first resistor R1 keeps the heating switch transistor Tf off or cut off. For example, the first resistor can be set to 1.2MΩ. When the on-current of the detection switch unit 110 is less than or equal to the preset current threshold, the voltage across the first resistor R1 decreases, which in turn turns on the heating switch transistor Tf.

[0047] For example, the voltage across the first resistor R1 needs to match the gate turn-on voltage of the heating switch transistor Tf. In this embodiment, the first resistor R1 can also be placed on the PCBA board, thereby reducing the space occupied within the display panel. For example, when the ambient temperature is -20 degrees Celsius, if the detection switch unit receives the STV signal and turns on, the voltage across the first resistor can be 1.55 microamps * 1200kΩ = 1.86V. When the ambient temperature is 0 degrees Celsius, the voltage across the first resistor is 2 microamps * 1200kΩ = 2.4V. Therefore, it can be seen that the lower the ambient temperature, the lower the voltage across the first resistor, which facilitates the turning on of the heating switch transistor in low-temperature environments.

[0048] The reset switch Tc is used to reset the voltage of the first capacitor C1, which can reset the voltage of the first capacitor C1 to the turn-off voltage of the heating switch Tf, thus turning off the heating switch Tf in a timely manner. Specifically, since the reset switch Tc is connected to the port of the level conversion unit 500 that outputs the frame reset signal, when the reset switch Tc receives the frame reset signal, the reset switch Tc is turned on, and the turn-on of the reset switch Tc can reset the voltage of the first capacitor C1. The frame reset signal is the RST signal, which marks the end of a frame. Therefore, when a frame ends, the heating switch Tf can also be turned off, avoiding heating of the pixel driving circuit 400 when display is not required, thus reducing power consumption.

[0049] The first terminal of the reset switch transistor Tc is the gate, the second terminal of the reset switch transistor Tc is the drain, and the third terminal of the reset switch transistor Tc is the source. The preset voltage VCC can be set according to the actual situation, and the preset voltage VCC can provide the working voltage for the reset switch transistor Tc.

[0050] In this embodiment, the heating control unit 200 can control whether the heating unit 300 heats, thereby improving the accuracy of heating and allowing heating to be turned on or off in a timely manner.

[0051] In one feasible embodiment, when the conduction current of the temperature monitoring unit 100 is less than or equal to a preset current threshold, the voltage across the first resistor R1 decreases, causing the heating switch transistor Tf to conduct, thereby turning on the heating control unit 200. When the reset switch Tc receives a frame reset signal, the reset switch Tc is turned on. When the reset switch Tc is turned on, the voltage of the first capacitor C1 is reset so that the heating switch Tf is turned off. When the heating switch Tf is turned off, the heating control unit 200 is turned off.

[0052] It should be noted that when the conduction current of the temperature monitoring unit 100 is less than or equal to the preset current threshold, the voltage across the first resistor R1 decreases when the conduction current is greater than the preset current threshold. When the voltage across the first resistor R1 decreases, the heating switch Tf will be turned on. When the heating switch Tf is turned on, the heating unit 300 will start heating, which will facilitate timely heating of the pixel driving circuit 400 in a low-temperature environment.

[0053] When the reset switch Tc receives the frame reset signal, the reset switch Tc turns on, thereby resetting the voltage across the first capacitor C1 to the turn-off voltage of the heating switch Tf, which in turn turns off the heating switch Tf. The turn-off of the heating switch Tf indicates that the heating control unit 200 is off. In other words, the turn-off of the heating switch causes the heating unit 300 to stop heating, thus avoiding heating the pixel driving circuit 400 after a frame ends, and avoiding excessive power consumption loss.

[0054] In addition, in this embodiment, when the detection switch unit is turned on, if the conduction current of the detection switch unit is less than or equal to a preset current threshold, the first capacitor C1 will also be charged. This facilitates the first capacitor C1 to maintain the conduction of the heating switch transistor Tf, so that the heating unit 300 can heat the pixel driving circuit 400 within one frame, avoiding the heating stoppage caused by insufficient gate turn-on voltage of the heating switch transistor Tf, and thus avoiding the phenomenon of horizontal stripes. Specifically, the high-level duration of the STV signal can be adjusted based on the size of the first capacitor C1, so that the amount of charge in the first capacitor C1 when the STV signal is high is enough to keep the heating switch transistor Tf on for one frame. To avoid overcharging of the first capacitor C1, this embodiment also provides a pull-down resistor RX to speed up the turn-off duration of the STV signal, thereby ensuring the accuracy of the charging of the first capacitor C1. In low-temperature environments, the amount of charge in the first capacitor C1 can be just enough to keep the heating switch transistor Tf on for one frame, which can minimize power consumption and avoid the occurrence of horizontal stripes.

[0055] This embodiment can avoid power loss caused by repeated heating. In actual testing, it was found that the power consumption of this embodiment can be reduced by at least 0.7W compared with the solution that reduces the horizontal stripe phenomenon by increasing the VGH voltage.

[0056] In one feasible embodiment, please refer to Figure 8 The display device also includes a voltage follower OP1. The first input terminal of the voltage follower OP1 is connected to the output terminal of the voltage follower OP1, the second input terminal of the voltage follower OP1 is connected to a preset following voltage Vg, and the output terminal of the voltage follower OP1 is connected to the third terminal of the heating switch tube Tf in the heating control unit 200.

[0057] It should be noted that the voltage follower OP1 can be used to increase the drive current so that when the heating switch Tf is turned on, it can provide sufficient voltage to the heating unit 300, thereby allowing the heating unit 300 to heat up quickly and effectively, so as to quickly heat the pixel driving circuit 400.

[0058] The preset follower voltage Vg can be provided by the power management unit 600 in the display device. It can be provided directly by the power management unit 600 or indirectly by the power management unit 600. This embodiment does not make specific limitations on this.

[0059] In one feasible embodiment, please refer to Figure 9 The display device also includes an isolating switch transistor Tg, the first end of which is connected to the first end of the first resistor R1, the second end of which is connected to the output of the voltage follower OP1, and the third end of which is connected to the third end of the heating switch transistor Tf. When the on-current of the detection switch unit 110 is greater than the preset current threshold, the isolation switch Tg is turned off to cut off the current output from the voltage follower OP1 to the heating switch Tf.

[0060] It should be noted that the isolation switch Tg can be an NMOS transistor. The first terminal of the isolation switch Tg is the gate, and the gate of the isolation switch Tg is connected to the first terminal of the first resistor R1. When the on-current of the detection switch unit 110 is greater than the preset current threshold, the voltage across the first resistor R1 will decrease, which will also cause the isolation switch Tg to be turned off, thereby cutting off the current output to the heating switch Tf through the voltage follower OP1. This prevents leakage current from flowing to the heating switch Tf and the heating unit 300, which would cause false heating, thus ensuring the reliability of the display device and reducing power consumption.

[0061] In one feasible embodiment, please refer to Figure 10 and Figure 11The display device also includes a display panel, and the heating unit 300 includes at least one heating component, which is a heating resistor Rs1 or a transparent conductive trace in the display panel. When the heating unit 300 includes at least two heating resistors, the at least two heating resistors are connected in parallel. The first end of the heating component is connected to the output end of the heating control unit 200, and the second end of the heating component is connected to the pixel driving circuit 400.

[0062] It should be noted that the heating component can be a heating resistor Rs1 or a transparent conductive trace. The heating resistor Rs1 can be a resistance wire, and the transparent conductive trace can be an ITO (Indium Tin Oxide) trace. The heating unit 300 can include one or more heating resistors. In the case of multiple heating resistors, the multiple heating resistors are connected in parallel. In this embodiment, the multiple heating resistors can be respectively set in different pixels to heat different pixels. For example, in the case of multiple heating components, different heating components can be connected to the pixel driving circuit 400 of different pixels, or they can be connected to the pixel driving circuit 400 of the same pixel. The connection of the heating component to the pixel driving circuit 400 is actually connected to a preset common voltage Vu in the pixel driving circuit 400. The preset common voltage Vu in the pixel driving circuit 400 can be ground or the voltage of the common electrode VCOM. This embodiment does not specifically limit this. The heating unit 300 can also include a heating resistor Rs1 and / or a transparent conductive trace. This embodiment does not specifically limit this, and the specific configuration can be based on the actual situation. The smaller the resistance of the heating resistor, the higher the heating efficiency. For example, the heating resistor can be set to 100Ω.

[0063] exist Figure 10 The diagram shows a circuit where the heating element of the heating unit 300 is a heating resistor Rs1, and the number of heating resistors Rs1 is 1. Figure 11 The diagram shows a circuit diagram of the heating unit 300, which includes multiple heating resistors. Figure 11 It includes m heating resistors, which are connected in parallel. Figure 10 and Figure 11 All heating resistors can be replaced with transparent conductive traces. m is a positive integer greater than 1. Figure 11 Rs1~Rsm in the text refer to multiple heating resistors.

[0064] In this embodiment, the existing transparent conductive traces inside the display panel can be used as heating components, thereby reducing costs and space occupancy within the display panel.

[0065] In one feasible embodiment, please refer to Figures 12-14Multiple first target detection pixels are determined in the display panel. The first target detection pixels are pixels in even-numbered rows and even-numbered columns or pixels in odd-numbered columns and odd-numbered rows in the display panel. Each first target detection pixel is provided with a detection switch unit 110 in the temperature monitoring unit 100. The pixel driving circuit 400 of the first pixel other than the first target detection pixel in the display panel is connected to the heating unit 300. Different first pixels are connected to different heating units 300. The heating control unit 200 is set in any pixel in the display panel. The heating units 300 set in the first pixel are all connected to the heating control unit 200. The multiple detection switch units 110 in the display panel are connected in parallel. Alternatively, multiple target local pixels are determined in the display panel, and each target local pixel is provided with a detection switch unit 110 and a heating unit 300. The heating unit 300 is connected to the pixel driving circuit 400 of the target local pixel. The target local pixel is any pixel in the display panel. Any two target local pixels among the multiple target local pixels are not adjacent. The heating control unit 200 is set in any pixel of the display panel. The multiple detection switch units 110 in the display panel are connected in parallel. Alternatively, a second target detection pixel is determined in the display panel. The temperature monitoring unit 100 and the heating control unit 200 are set in the second target detection pixel. The pixel driving circuit 400 of each second pixel in the display panel, except for the second target detection pixel, is connected to a heating unit 300. The heating units 300 connected to different second pixels are different. The heating unit 300 in each second pixel is connected to the heating control unit 200 in the second target detection pixel.

[0066] It should be noted that, in this embodiment, the detection switch unit 110, heating unit 300 and heating control unit 200 in the temperature monitoring unit 100 can be arranged in various ways on the display panel. Different layout implementation methods can be selected based on the actual situation. Arranging the detection switch unit 110, heating unit 300 and heating control unit 200 on the display panel expands the applicable scenarios of this embodiment.

[0067] Please refer to Figure 12 , Figure 12The first layout implementation is illustrated: multiple first target detection pixels can be defined in the display panel. These first target detection pixels are pixels located in even-numbered rows and even-numbered columns, or pixels located in odd-numbered rows or odd-numbered columns. This embodiment does not impose specific limitations and can determine the specific implementation based on actual conditions. A detection switch unit 110 can be set in one of the first target detection pixels, and a heating unit 300 can be set in one of the first pixels in the display panel. The first pixel is any pixel in the display panel other than the first target detection pixel. Since the first target detection pixel is either an even-numbered row and even-numbered column pixel or an odd-numbered row and odd-numbered column pixel, this layout implementation is equivalent to an enclosed layout, resulting in better and more accurate heating. Figure 12 The diagram shows a layout of pixels in even rows and even columns for the first target detection. Figure 12 L1 and L2 are both wires. L1 is used to connect the heating unit 300, which can be placed in the first pixel, in parallel to the PCBA board. L2 is placed in the detection switch unit 110, which is connected in parallel to the PCBA board, because the constant current source Q1, pull-down resistor RX, and other devices in the temperature monitoring unit 100 are all located in the PCBA board.

[0068] The detection switch unit 110 in the first target detection pixel can be a single detection switch transistor Tz1 or multiple detection switch transistors connected in parallel. For example, a detection switch transistor Tz1 can be placed in each first target detection pixel, and the detection switch transistors placed in each first target detection pixel are connected in parallel. In other embodiments, the number of detection switch transistors placed can also be different depending on the first target detection pixel. This embodiment does not make a specific limitation on this.

[0069] The detection switch units 110 placed in different first target detection pixels can all be connected to the same constant current source Q1 and the same pull-down resistor RX, thereby reducing device cost. In addition, each detection switch unit 110 can also be connected to the same heating control unit 200, thereby reducing the space occupied in the display panel. The heating control unit 200 can be set in any pixel of the display panel. For example, the heating control unit 200 can also be set in any first target detection pixel or any first pixel. This embodiment does not make specific limitations in this regard.

[0070] The heating unit 300 can be a single heating component or multiple heating components; this embodiment does not impose a specific limitation. One heating component can be placed in each first pixel, and the heating components placed in each first pixel are connected in parallel. In other embodiments, the number of heating components can vary depending on the first pixel; this embodiment does not impose a specific limitation in this regard. Furthermore, the placed heating component can be a heating resistor Rs1 or an ITO trace; this embodiment does not impose a specific limitation in this regard. In other embodiments, the heating control unit can also be directly disposed in the PCBA board to reduce the space occupied within the display panel.

[0071] Please refer to Figure 13 , Figure 13 A schematic diagram of the second layout implementation is shown. The following is a brief description of the second layout implementation: Multiple target local pixels can be defined in the display panel. A detection switch unit 110 or a heating unit 300 can be placed in each target local pixel. That is, temperature monitoring and heating can both be achieved in the target local pixels. Any two target local pixels in the display panel are not adjacent. For example, in this embodiment, a preset number of pixels can be used as a local unit, which can be 9. The display panel can be divided into multiple local units, which can be represented as a 3x3 grid. For each local unit, the central pixel of the local unit can be taken as the target local pixel. For example... Figure 13 There are 6 local pixels of the target. Figure 13 The L1 wire is used to connect the heating unit 300 in the target local pixel in parallel to the PCBA board, and the L2 wire is used to connect the detection switch unit 110 in the target local pixel in parallel to the PCBA board.

[0072] The detection switch units 110 placed on each target local pixel are connected in parallel, and the heating units 300 placed on each target local pixel are connected in parallel. The detection switch unit 110 can be a single detection switch transistor Tz1 or multiple detection switch transistors connected in parallel. This embodiment does not make a specific limitation in this regard. The heating unit 300 can be a single heating component or multiple heating components connected in parallel. This embodiment does not make a specific limitation in this regard.

[0073] The heating control unit 200 can also be placed in any pixel of the display panel. For example, the heating control unit 200 can be placed in any target local pixel of the display panel, and this embodiment does not specifically limit this. The second layout implementation is equivalent to a point layout, which detects local heat generation locally, has a simple structure, and low heating power consumption. In other embodiments, the heating control unit can also be directly set in the PCBA board to reduce the space occupied within the display panel.

[0074] In other embodiments, the heating unit 300 can be placed in any one or more pixels other than the target local pixel in the local unit, and this embodiment does not specifically limit this.

[0075] Please refer to Figure 14 , Figure 14 A schematic diagram of a third layout embodiment is shown, and the following describes the third layout embodiment: A second target detection pixel is determined in the display panel, and a switching unit 110 is detected in the second target detection pixel. That is, in this embodiment, the number of pixels in which the detection switching unit 110 is placed is 1, and the second pixel is any pixel in the display panel other than the second target detection pixel. The heating unit 300 in each second pixel can refer to the conduction current in the second target detection pixel of the detection switching unit 110. In the third layout embodiment, the heating unit 300 can also be one or more heating components, and the heating units 300 in the display panel are connected in parallel. Different second pixels have different placement of heating units 300. In this embodiment, the heating control unit 200 can be placed in the second target detection pixel, and all heating units 300 placed in the second pixel are connected to the heating control unit 200 in the second target detection pixel. This embodiment can reduce costs, simplify layout, and is easy to implement. Figure 14 As can be seen, the number of second target detection pixels in the display panel is 1. The position of the second target detection pixel can be set based on the actual situation, and this embodiment does not impose specific limitations on it. Figure 14 The L1 wire is used to connect the heating unit 300, which is placed in the second pixel, in parallel to the PCBA board. Figure 14 The L2 wire is used to connect the detection switch unit 110, which is placed in the second target detection pixel, to the PCBA board. In other embodiments, the heating control unit can also be directly disposed in the PCBA board to reduce the space occupied in the display panel.

[0076] This embodiment provides multiple layout implementation methods, which facilitates the selection of the most suitable layout method based on the actual situation and improves the applicability of this embodiment.

[0077] In one feasible embodiment, please refer to Figure 15 and Figure 16 The pixel driving circuit 400 is either a first driving circuit or a second driving circuit, and the display device also includes a power management unit 600. The first driving circuit includes a first switching transistor T1, a second switching transistor T2, a light-emitting device D1, and a first storage capacitor Cs. The first end of the first switching transistor T1 is connected to the gate line in the display panel, the second end of the first switching transistor T1 is connected to the data line in the display panel, the third end of the first switching transistor T1 is connected to the first end of the second switching transistor T2 and the first end of the first storage capacitor Cs, the second end of the second switching transistor T2 is connected to the anode of the light-emitting device D1, the cathode of the light-emitting device D1 is connected to the preset common voltage Vu, the third end of the second switching transistor T2 is connected to the power management unit 600, and the second end of the first storage capacitor Cs is connected to the second input terminal of the voltage follower OP1 in the display device. The second driving circuit includes a third switch transistor T3, a liquid crystal capacitor Clc, a parasitic capacitor Cgs, and a second storage capacitor Cst. The first terminal of the third switch transistor T3 and the first terminal of the parasitic capacitor Cgs are connected to the gate line. The second terminal of the third switch transistor T3 is connected to the data line. The third terminal of the third switch transistor T3 is connected to the second terminal of the parasitic capacitor Cgs, the first terminal of the storage capacitor, and the first terminal of the liquid crystal capacitor Clc. The second terminals of the storage capacitor and the second terminal of the liquid crystal capacitor Clc are connected to a preset common voltage Vu.

[0078] It should be noted that the first driving circuit can be an OLED circuit, and the second driving circuit is a TFT-LCD circuit.

[0079] Reference Figure 15 The diagram illustrates the circuit of the first driving circuit. The light-emitting device D1 can be an OLED. In the first driving circuit, the second terminal of the first storage capacitor Cs is connected to the second input terminal of the voltage follower OP1 in the display device. That is, the preset following voltage Vg of the voltage follower OP1 is connected through the first storage capacitor Cs. The first storage capacitor Cs is connected to the power management unit 600 through the second switch T2. The power management unit 600 can provide power. The power management unit can be a PMIC, and the output voltage of the power management unit can be 13.5V or other values. This embodiment does not specifically limit this. When the pixel driving circuit 400 is the first driving circuit, the voltage follower OP1 can be connected to the power provided by the power management unit 600 through the second switch T2 and the first storage capacitor Cs. The voltage follower OP1 can indirectly increase the driving current of the power management unit 600, which is equivalent to the preset following voltage being provided by the power management unit to the second input terminal of the voltage follower through the second switch and the first storage capacitor. Both the first switch T1 and the second switch T2 are TFTs. The closer the heating unit 300 is to the first switching transistor T1 and the second switching transistor T2, the better the heating effect. In addition, in this embodiment, the gate of the first switching transistor T1 can also receive the CK signal (timing signal) output by the level conversion unit 500.

[0080] When the pixel driving circuit 400 is the first driving circuit, the preset common voltage Vu is the ground voltage, and the heating unit 300 is connected to the pixel driving circuit 400, which can be the ground voltage in the first driving circuit. Figure 15 It can also be equipped with an isolating switch tube Tg, multiple parallel detection switch units 110, and multiple parallel heating components, etc. Figure 15 Not shown in the image.

[0081] Reference Figure 16 The diagram illustrates the second driving circuit, where the third switch T3 can be a TFT. When the pixel driving circuit 400 is the second driving circuit, the preset common voltage Vu is the voltage of the common electrode VCOM. When the pixel driving circuit 400 is the second driving circuit, the power management unit 600 can be directly connected to the second input terminal of the voltage follower OP1. The voltage follower OP1 can directly enhance the driving current of the power management unit 600; that is, the preset follower voltage is provided by the power management unit. When the pixel driving circuit 400 is the second driving circuit, the heating unit 300 is connected to the pixel driving circuit 400, which can be the heating unit 300 being connected to the common electrode VCOM in the second driving circuit. The closer the heating unit 300 is to the third switch T3, the better the heating effect. Additionally, in this embodiment, the gate of the third switch T3 can also receive the CK signal (timing signal) output by the level conversion unit 500. Figure 16 It can also be equipped with an isolating switch tube Tg, multiple parallel detection switch units 110, and multiple parallel heating components, etc. Figure 16 Not shown in the image.

[0082] In addition, for a better understanding of this embodiment, you can also refer to Figure 17 , Figure 17 The diagram shows the waveforms of the STV, RST, and CK signals output by the level conversion unit 500. Figure 17 As can be seen, the STV signal is the start signal of a frame, the RST signal is equivalent to the end signal of a frame, and the CK signal can periodically output a high level after the STV signal appears.

[0083] This embodiment can support multiple pixel driving circuits 400, thereby expanding the application scenarios of this embodiment.

[0084] Furthermore, this application also provides a display device, which includes the display apparatus of the above embodiments, aiming to solve the problem of abnormal horizontal stripe display caused by the poor performance of TFTs in low-temperature environments. Compared with the prior art, the beneficial effects of the display device provided in this application are the same as those of the display apparatus provided in the above embodiments, and other technical features in this display device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0085] The above are merely preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structural or procedural transformations made using the description and drawings of the present application, or direct or indirect applications in other related technical fields, are similarly included within the patent processing scope of the present application.

Claims

1. A display device, characterized in that, The display device includes: a temperature monitoring unit, a heating control unit, a heating unit, a pixel driving circuit, and a level conversion unit; The input terminal of the temperature monitoring unit is connected to the level conversion unit, the output terminal of the temperature monitoring unit is connected to the input terminal of the heating control unit, the output terminal of the heating control unit is connected to the first terminal of the heating unit, and the second terminal of the heating unit is connected to the pixel driving circuit. The temperature monitoring unit is turned on when it receives the start signal of the output frame from the level conversion unit, and the conduction current of the temperature monitoring unit is positively correlated with the temperature. The heating control unit is turned on when the conduction current of the temperature monitoring unit is less than or equal to a preset current threshold, and the heating unit is used to heat the pixel driving circuit when the heating control unit is turned on.

2. The display device as claimed in claim 1, characterized in that, The temperature monitoring unit includes a constant current source, a pull-down resistor, and a detection switch unit. The detection switch unit includes at least one detection switch transistor. When the detection switch unit includes at least two detection switch transistors, the at least two detection switch transistors are connected in parallel. The conduction current of the detection switch unit is positively correlated with the temperature. The control terminal of the detection switch unit is used as the input terminal of the temperature monitoring unit. The control terminal of the detection switch unit is connected to the port of the level conversion unit that outputs the frame start signal, and the first terminal of the pull-down resistor. The second terminal of the pull-down resistor is connected to a preset common voltage. The first end of the detection switch unit is connected to a constant current source, and the second end of the detection switch unit is used as the output end of the temperature monitoring unit.

3. The display device as claimed in claim 1, characterized in that, The heating control unit includes a heating switch transistor, a reset switch transistor, a first capacitor, and a first resistor; Both the first end of the first resistor and the first end of the heating switch tube are used as input terminals of the heating control unit, and the second end of the first resistor is connected to a preset common voltage. The first terminal of the reset switch is connected to the port of the level conversion unit that outputs the frame reset signal, the second terminal of the reset switch is connected to a preset voltage, and the third terminal of the reset switch is connected to the first terminal of the heating switch. The first end of the first capacitor is connected to the first end of the heating switch tube, and the second end of the first capacitor is connected to a preset common voltage. The second end of the heating switch tube is used as the output end of the heating control unit.

4. The display device as claimed in claim 3, characterized in that, When the conduction current of the temperature monitoring unit is less than or equal to a preset current threshold, the voltage across the first resistor decreases, causing the heating switch tube to conduct, thereby turning on the heating control unit. When the reset switch receives a frame reset signal, the reset switch is turned on. When the reset switch is turned on, the voltage of the first capacitor is reset so that the heating switch is turned off. When the heating switch is turned off, the heating control unit is turned off.

5. The display device as claimed in claim 3, characterized in that, The display device further includes a voltage follower, the first input terminal of which is connected to the output terminal of the voltage follower, the second input terminal of which is connected to a preset following voltage, and the output terminal of which is connected to the third terminal of the heating switch tube in the heating control unit.

6. The display device according to any one of claims 1-5, characterized in that, The display device further includes an isolating switch transistor, the first end of which is connected to the first end of the first resistor, the second end of which is connected to the output terminal of the voltage follower, and the third end of which is connected to the third end of the heating switch transistor. When the conduction current of the detection switch unit is greater than a preset current threshold, the isolation switch is turned off to cut off the current output from the voltage follower to the heating switch.

7. The display device as claimed in claim 1, characterized in that, The display device further includes a display panel, and the heating unit includes at least one heating component, which is a heating resistor or a transparent conductive trace in the display panel. When the heating unit includes at least two heating resistors, the at least two heating resistors are connected in parallel. The first end of the heating component is connected to the output end of the heating control unit, and the second end of the heating component is connected to the pixel driving circuit.

8. The display device as claimed in claim 7, characterized in that, Multiple first target detection pixels are defined in the display panel. These first target detection pixels are pixels in even-numbered rows and even-numbered columns, or pixels in odd-numbered columns and odd-numbered rows. Each first target detection pixel is equipped with a detection switch unit from a temperature monitoring unit. The pixel driving circuits of the first pixels (excluding the first target detection pixels) in the display panel are connected to heating units. Different first pixels are connected to different heating units. A heating control unit is located in any pixel of the display panel. All heating units located in the first pixels are connected to the heating control unit. The multiple detection switch units in the display panel are connected in parallel. Alternatively... Multiple target local pixels are defined in the display panel. Each target local pixel is provided with a detection switch unit and a heating unit. The heating unit is connected to the pixel driving circuit of the target local pixel. The target local pixel is any pixel in the display panel. Any two target local pixels are not adjacent. The heating control unit is set in any pixel of the display panel. The multiple detection switch units in the display panel are connected in parallel. or, A second target detection pixel is determined in the display panel. The temperature monitoring unit and the heating control unit are disposed in the second target detection pixel. The pixel driving circuit of each second pixel in the display panel other than the second target detection pixel is connected to a heating unit. The heating units connected to different second pixels are different. The heating unit in each second pixel is connected to the heating control unit in the second target detection pixel.

9. The display device as claimed in claim 1, characterized in that, The pixel driving circuit is either a first driving circuit or a second driving circuit, and the display device further includes a power management unit. The first driving circuit includes a first switching transistor, a second switching transistor, a light-emitting device, and a first storage capacitor. The first end of the first switching transistor is connected to the gate line in the display panel, the second end of the first switching transistor is connected to the data line in the display panel, the third end of the first switching transistor is connected to the first end of the second switching transistor and the first end of the first storage capacitor, the second end of the second switching transistor is connected to the anode of the light-emitting device, the cathode of the light-emitting device is connected to a preset common voltage, the third end of the second switching transistor is connected to the power management unit, and the second end of the first storage capacitor is connected to the second input terminal of the voltage follower in the display device. The second driving circuit includes a third switching transistor, a liquid crystal capacitor, a parasitic capacitor, and a second storage capacitor. The first end of the third switching transistor and the first end of the parasitic capacitor are connected to the gate line. The second end of the third switching transistor is connected to the data line. The third end of the third switching transistor is connected to the second end of the parasitic capacitor, the first end of the storage capacitor, and the first end of the liquid crystal capacitor. The second end of the storage capacitor and the second end of the liquid crystal capacitor are connected to a preset common voltage.

10. A display device, characterized in that, The display device includes the display apparatus as described in any one of claims 1-9.

Images