Temperature detection circuit, temperature detection method, and display device

Abstract

The application discloses a temperature detection circuit, a temperature detection method and a display device. The temperature detection circuit comprises a display control module, a temperature detection module, a timing control module and a storage module. The display control module comprises a first output channel and a second output channel. The temperature detection module is connected with the second output channel of the display control module. The timing control module is connected with the temperature detection module. The storage module is connected with the temperature detection module and the timing control module and stores a first lookup table. The timing control module outputs a corresponding second gray scale voltage to the second output channel of the display control module based on the first lookup table, so as to output to the temperature detection module to start temperature detection. The application outputs the corresponding second gray scale voltage to the second output channel of the display control module through the first lookup table to start temperature detection, avoids the case that a large difference of the display panel directly causes a large measurement error when temperature detection is performed, and reduces the error of the temperature detection result.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a temperature detection circuit, a temperature detection method, and a display device. Background Technology

[0002] In the display panel industry, temperature has a significant impact on everything from the transistors and liquid crystals in LCD panels to the electroluminescent materials in OLED panels. Globally, habitable temperatures range from -20°C to 50°C. As the display industry evolves, consumers increasingly demand advanced display panel characteristics, such as faster response times, wider viewing angles, higher refresh rates, and better image quality. To meet these requirements, display panels may need different voltage and current driving methods and different algorithms to compensate for image quality issues, depending on the specific problem. To achieve this, temperature detection functionality is essential.

[0003] Typical temperature detection functions typically involve a built-in constant current source (output current at the μA level) within the power supply chip (PMIC), with external resistors such as R1, R2, and Rt connected in series and parallel. Rt is a thermistor, and its resistance changes with temperature. The resistance of R2 is similar to that of Rt within the operating temperature range. When the temperature changes, the total resistance of the series and parallel circuit consisting of R1, R2, and Rt also changes accordingly. Because this temperature detection function uses the constant current source and voltage detection inside the PMIC, it generally needs to be placed on the same circuit board as the PMIC. However, the circuit board containing the PMIC usually has many high-power components that generate heat simultaneously. As a result, the detected temperature cannot accurately reflect the ambient temperature of the display panel, leading to a relatively large temperature error. Summary of the Invention

[0004] The purpose of this application is to provide a temperature detection circuit, a temperature detection method, and a display device that reduce errors in temperature detection results.

[0005] This application discloses a temperature detection circuit for detecting the temperature of a display panel. The temperature detection circuit includes a display control module, a temperature detection module, a timing control module, and a storage module. The display control module includes a first output channel and a second output channel. The temperature detection module is disposed on the display panel and connected to the second output channel of the display control module. The timing control module is connected to both the temperature detection module and the display control module. The storage module is connected to both the temperature detection module and the timing control module and stores a first lookup table. The first output channel outputs a first grayscale voltage to the data line of the display panel, and the timing control module outputs a corresponding second grayscale voltage to the second output channel of the display control module based on the first lookup table, so as to output to the temperature detection module to enable temperature detection.

[0006] Optionally, the temperature detection module includes a sensing metal ring and a fixed resistor. One end of the sensing metal ring is connected to the second output channel, and the other end of the sensing metal ring is connected to the fixed resistor. One end of the fixed resistor is grounded, and the other end of the fixed resistor is connected to the sensing metal ring and the timing control module. The second grayscale voltage is the grayscale voltage of the blanking region. The first lookup table includes a first lookup sub-table and a grayscale voltage adjustment sub-table. The first lookup sub-table is a table showing the relationship between the voltage and temperature of the fixed resistor. The grayscale voltage adjustment sub-table is a table showing the relationship between the grayscale voltage and temperature at different temperatures so that the voltage of the fixed resistor is the same as the voltage of the fixed resistor in the first lookup sub-table.

[0007] Optionally, the second output channel is a redundant output channel of the display control module. The temperature detection module further includes an analog-to-digital converter. The sensing metal ring is disposed in the non-display area of ​​the display panel. One end of the sensing metal ring is connected to the second output channel, and the other end of the sensing metal ring is grounded through a fixed resistor. One end of the analog-to-digital converter is connected between the fixed resistor and the sensing metal ring, and the other end of the analog-to-digital converter is connected to the timing control module. The analog-to-digital converter converts the voltage on the sensing metal ring into a digital signal and outputs it to the timing control module.

[0008] Optionally, each display control module is equipped with a temperature detection module. Each temperature detection module includes a sensing metal ring and a fixed resistor. One end of the sensing metal ring is connected to the second output channel, and the other end of the sensing metal ring is connected to the fixed resistor. One end of the fixed resistor is grounded, and the other end of the fixed resistor is connected to the sensing metal ring. The timing control module includes multiple voltage detection ports. Each voltage detection port is connected between the fixed resistor and the sensing metal ring of the corresponding temperature detection module to identify the voltage value of the fixed resistor. Each voltage detection port has a corresponding threshold voltage. When the temperature detection module starts temperature detection, the comparison result between the voltage value of each fixed resistor and the threshold voltage of the voltage detection port indicates different temperatures.

[0009] Optionally, the display control module has at least four voltage detection ports, and the voltage values ​​of the fixed resistors detected by the voltage detection ports are V1, V2, V3, and V4, respectively, where V2 = V1 + ΔV.

[0010] V3 = V1 + 2△V, V4 = V1 + 3△V, △V is a preset voltage difference. The corresponding second grayscale voltage is selected for different display control modules and output to the second output channel of the display control module to enable temperature detection of the temperature detection module.

[0011] Optionally, the second grayscale voltage is the grayscale voltage of the blanking area. The temperature detection circuit further includes a polarity switching module. When the display panel enters the blanking area, the polarity switching module turns off the polarity switching of the grayscale voltage in the blanking area. The second output channel of the display control module receives the second grayscale voltage and outputs it to the temperature detection module to enable temperature detection. Before the blanking area ends, after the temperature detection ends, the polarity switching module turns on the polarity switching of the grayscale voltage.

[0012] Optionally, the temperature detection circuit includes a power supply voltage output control module, which is connected to the temperature detection module and the power chip respectively. When the temperature detection module starts temperature detection, if the detected temperature is greater than the preset temperature value, the connection with the power chip is disconnected and no more power supply voltage is input to the display panel.

[0013] This application also discloses a temperature detection method for use in any of the temperature detection circuits described above to detect the temperature of a display panel, the temperature detection method comprising:

[0014] Generate the corresponding first grayscale voltage and second grayscale voltage;

[0015] Output the corresponding first grayscale voltage to the data line of the display panel; and

[0016] Based on the first lookup table, the corresponding second grayscale voltage is output to the second output channel of the display control module, so as to output to the temperature detection module to enable temperature detection.

[0017] Optionally, the step of outputting the corresponding second grayscale voltage based on the first lookup table to the second output channel of the display control module, so as to output to the temperature detection module to enable temperature detection, includes:

[0018] Based on the design phase data of the display panel, a first reference table was created to determine the voltage and temperature relationship of the detected fixed resistors.

[0019] At a fixed temperature, the voltage of the fixed resistor is detected in real time, and the second gray level voltage is continuously adjusted so that the detected voltage of the fixed resistor is the same as the voltage of the fixed resistor in the first reference sub-table. The second gray level voltage and temperature at this time are used to make a gray level voltage adjustment sub-table.

[0020] After the display panel restarts, the second grayscale voltage output in the grayscale voltage debugging sub-table is called and sent to the second output channel of the display control module to enable temperature detection.

[0021] This application also discloses a display device, which includes a temperature detection circuit and a display panel as described in any of the above descriptions, wherein the temperature detection circuit uses a temperature detection method as described in any of the above descriptions to detect the temperature of the display panel.

[0022] Compared to the solution of directly setting a thermistor to detect the temperature of the display panel, this application connects the second output channel of the display control module to the temperature detection module, and outputs the corresponding second grayscale voltage based on the first lookup table to the second output channel of the display control module to enable temperature detection. By enabling temperature detection based on the grayscale voltage, different display panels use different grayscale voltages in the lookup table to achieve temperature detection, avoiding the situation where direct temperature detection would lead to large measurement errors when there are large individual differences in the display panels, and reducing the error of the temperature detection results. Attached Figure Description

[0023] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0024] Figure 1 This is a schematic diagram of the temperature detection circuit and display panel structure according to the first embodiment of this application;

[0025] Figure 2 This is a partial structural schematic diagram of the temperature detection circuit according to the second embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the grayscale voltage waveform without temperature detection in the second embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the grayscale voltage waveform when the temperature detection is turned on according to the second embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the temperature detection activation area according to the second embodiment of this application;

[0029] Figure 6 This is a schematic diagram of the temperature detection circuit and display panel structure according to the third embodiment of this application;

[0030] Figure 7 This is a schematic diagram of the temperature detection circuit and display panel structure according to the fourth embodiment of this application;

[0031] Figure 8 This is a schematic flowchart of the temperature detection method according to the fifth embodiment of this application;

[0032] Figure 9 This is a schematic flowchart of the temperature detection method according to the sixth embodiment of this application;

[0033] Figure 10 This is a schematic diagram of the structure of the display device according to the seventh embodiment of this application.

[0034] Among them, 100 is a temperature detection circuit; 110 is a display control module; 111 is a first output channel; 112 is a second output channel; 120 is a temperature detection module; 121 is a sensing metal ring; 122 is a fixed resistor; 123 is an analog-to-digital converter; 130 is a timing control module; 140 is a storage module; 150 is a polarity switching module; 160 is a power supply voltage output control module; 170 is a power chip; 180 is a circuit board; 200 is a display panel; and 300 is a display device. Detailed Implementation

[0035] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0036] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0037] refer to Figure 1As shown, in the first embodiment of this application, a temperature detection circuit 100 is disclosed. The temperature detection circuit 100 is used for temperature detection of the display panel 200. The temperature detection circuit 100 includes a display control module 110, a temperature detection module 120, a timing control module 130, and a storage module 140. The timing control module 130 and the storage module 140 are disposed on the same circuit board 180. The display control module 110 (source) The driver includes a first output channel 111 and a second output channel 112; the temperature detection module 120 is disposed on the display panel 200 and connected to the second output channel 112 of the display control module 110; the timing control module 130 is connected to the temperature detection module 120 and the display control module 110 respectively; the storage module 140 is connected to the temperature detection module 120 and the timing control module 130 and stores a first lookup table; wherein, the first output channel 111 outputs a first grayscale voltage to the data line of the display panel 200, and the timing control module 130 outputs a corresponding second grayscale voltage to the second output channel 112 of the display control module 110 based on the first lookup table, so as to output to the temperature detection module 120 to enable temperature detection. Under normal circumstances, the first grayscale voltage and the second grayscale voltage use the same grayscale voltage. When temperature detection is enabled, the second grayscale voltage and the first grayscale voltage are different.

[0038] In this embodiment, the temperature detection circuit 100 is connected to the temperature detection module 120 via the second output channel 112 of the display control module 110. The second grayscale voltage output to the second output channel 112 of the display control module 110 is determined by a pre-set first lookup table. Different display panels 200 have different corresponding second grayscale voltages. By inputting the pre-set second grayscale voltage to the temperature detection module 120, temperature detection is activated. This is equivalent to automatically adjusting the second grayscale voltage of each individual product, such as each display panel 200 or each circuit board 180, so that the temperature detection results are consistent with the lookup table. This can effectively reduce the error in temperature detection between different individuals and improve the display effect.

[0039] refer to Figure 2 As shown, the second embodiment of this application is a further refinement of the first embodiment described above. (Refer to...) Figures 1 to 5As shown, the temperature detection module 120 includes a sensing metal ring 121 and a fixed resistor 122. One end of the sensing metal ring 121 is connected to the second output channel 112, and the other end of the sensing metal ring 121 is connected to the fixed resistor 122. One end of the fixed resistor 122 is grounded, and the other end of the fixed resistor 122 is connected to the sensing metal ring 121 and the timing control module 130 respectively. The second grayscale voltage is the grayscale voltage of the blanking region. The first lookup table includes a first reference sub-table and a grayscale voltage adjustment sub-table. The first reference sub-table is a table showing the relationship between the voltage and temperature of the fixed resistor 122. The grayscale voltage adjustment sub-table is a table showing the relationship between the grayscale voltage and temperature at different temperatures so that the voltage of the fixed resistor 122 is the same as the voltage of the fixed resistor 122 in the first reference sub-table.

[0040] The second output channel 112 is a redundant output channel of the display control module 110. The temperature detection module 120 also includes an analog-to-digital converter 123. The sensing metal ring 121 is disposed in the non-display area of ​​the display panel 200. One end of the sensing metal ring 121 is connected to the second output channel 112, and the other end of the sensing metal ring 121 is grounded (GND) through a fixed resistor 122. One end of the analog-to-digital converter 123 is connected between the fixed resistor 122 and the sensing metal ring 121, and the other end of the analog-to-digital converter 123 is connected to the timing control module 130. The analog-to-digital converter 123 converts the voltage on the sensing metal ring 121 into a digital signal and outputs it to the timing control module 130.

[0041] Furthermore, the second grayscale voltage is the grayscale voltage of the blanking area. The temperature detection circuit 100 also includes a polarity switching module 150. When the display panel 200 enters the blanking area, the polarity switching module 150 turns off the polarity switching of the grayscale voltage in the blanking area. The second output channel 112 of the display control module 110 receives the second grayscale voltage and outputs it to the temperature detection module 120 to enable temperature detection. Before the blanking area ends, after the temperature detection ends, the polarity switching module 150 turns on the polarity switching of the grayscale voltage.

[0042] In this embodiment, the display control module 110 (source driver) of the display panel 200 generally has redundant output channels (such as ch966), namely the second output channel 112. These redundant output channels can be controlled by the timing control module 130 to control their output voltage. In this way, these redundant output channels can be used as the voltage source of the series circuit of the sensing metal ring 121 and the resistor. Then, the voltage signal on the resistor after voltage division is sent to the analog-to-digital converter 123 (ADC) for analog-to-digital conversion, and then sent to the timing control module 130, i.e., the timing control chip (TCON IC).

[0043] The output channel of the display control module 110 (source driver) normally used for data lines, i.e., the first grayscale voltage output waveform on the first output channel 111, will switch between positive and negative polarities, such as... Figure 3 As shown; to simplify the potential detection of the temperature detection module 120, the output waveform of the redundant channel of the source driver, i.e., the output waveform of the second grayscale voltage, is as follows. Figure 4 As shown, there is no voltage fluctuation with polarity switching. Generally, as... Figure 5 As shown, when entering the cancellation zone, the polarity switching of the cancellation zone is turned off, and then the grayscale voltage of the cancellation zone, i.e. the second grayscale voltage, is transmitted. When the cancellation zone is about to end, the polarity switching of the next frame display area is turned on. Then, temperature detection is performed between turning off the polarity switching of the cancellation zone and turning on the polarity switching of the next frame display area. In this way, the display is not affected and temperature can be detected.

[0044] Since the output voltage of the redundant channels of the source driver can be set by the grayscale voltage of the anonymization zone transmitted to the source driver by the timing control module 130, a lookup table is first established based on the design phase data to determine the correspondence between the detected voltage and temperature. Then, the voltage VDC on the fixed resistor 122 is measured at different ambient temperatures, and the grayscale voltage or data grayscale output by the timing control module 130 to the source driver is adjusted so that the VDC voltage at different ambient temperatures conforms to the aforementioned lookup table. Subsequently, the corresponding adjusted grayscale voltage is recorded and saved in the grayscale voltage adjustment sub-table in the storage module 140. After the entire machine is restarted, the corresponding second grayscale voltage is retrieved from the first lookup table, thereby enabling the temperature detection function. By automatically adjusting the grayscale voltage of the anonymization zone, each product can ensure that the temperature detection results are consistent with the lookup table, thus effectively reducing the error when detecting the temperature on the display panel 200.

[0045] In addition, during the grayscale voltage adjustment process described above, a digital multimeter can be used to measure the voltage of the fixed resistor 122. The voltage at different temperatures can be converted into digital values ​​after voltage conversion. The timing control module 130 only needs to read the corresponding code and use the converted temperature and voltage values ​​as a reference to create the first reference sub-table.

[0046] refer to Figure 6 As shown, the third embodiment of this application is a further refinement of the first embodiment described above. (Refer to...) Figure 1 , Figures 3 to 6As shown, the temperature detection module 120 includes a sensing metal ring 121 and a fixed resistor 122. One end of the sensing metal ring 121 is connected to the second output channel 112, and the other end is connected to the fixed resistor 122. One end of the fixed resistor 122 is grounded, and the other end is connected to the sensing metal ring 121 and the timing control module 130 respectively. The second grayscale voltage is the grayscale voltage of the blanking region. The first lookup table includes a first comparison sub-table and a grayscale voltage adjustment sub-table. The first comparison sub-table is a table showing the relationship between the voltage and temperature of the fixed resistor 122. The grayscale voltage adjustment sub-table is a table showing the relationship between the grayscale voltage and temperature at different temperatures so that the voltage of the fixed resistor 122 is the same as the voltage of the fixed resistor 122 in the first comparison sub-table.

[0047] Each display control module 110 is equipped with a temperature detection module 120. Each temperature detection module 120 includes a sensing metal ring 121 and a fixed resistor 122. One end of the sensing metal ring 121 is connected to the second output channel 112, and the other end of the sensing metal ring 121 is connected to the fixed resistor 122. One end of the fixed resistor 122 is grounded, and the other end of the fixed resistor 122 is connected to the sensing metal ring 121. The timing control module 130 includes multiple voltage detection ports, each of which is connected to... The temperature detection module 120 uses a fixed resistor 122 and a sensing metal ring 121 to detect the voltage value of the fixed resistor 122. Each voltage detection port has a corresponding threshold voltage. When the temperature detection module 120 activates temperature detection, the comparison between the detected voltage value of each fixed resistor 122 and the threshold voltage of the voltage detection port indicates different temperatures. Generally, the display control module 110 has at least four such ports, and the voltage values ​​of the fixed resistor 122 detected by the voltage detection ports are V1, V2, and V3, respectively. V3 and V4, where V2=V1+ΔV, V3=V1+2ΔV, V4=V1+3ΔV, ΔV is a preset voltage difference. Different display control modules 110 select the corresponding second grayscale voltage output to the second output channel 112 of the display control module 110 to enable temperature detection by the temperature detection module 120. In this embodiment, the temperature detection circuit 100 also includes a polarity switching module 150. When the display panel 200 enters the blanking area, the polarity switching module 150 disables the polarity switching of the grayscale voltage in the blanking area. The second output channel 112 of the display control module 110 receives the second grayscale voltage and outputs it to the temperature detection module 120 to enable temperature detection. Before the blanking zone ends, after the temperature detection ends, the polarity switching module 150 enables the polarity switching of the grayscale voltage. When just entering the blanking zone, the polarity switching of the blanking zone is turned off, and then the grayscale voltage of the blanking zone, i.e., the second grayscale voltage, is transmitted. When the blanking zone is about to end, the polarity switching of the next frame display area is enabled. Then, temperature detection is performed between turning off the blanking zone polarity switching and enabling the polarity switching of the next frame display area.

[0048] This embodiment differs from the second embodiment described above in that it simplifies costs. This embodiment no longer requires an ADC. Instead, a sensing metal ring 121 is placed near each display control module 110. The redundant channel ch966 of each source driver is used as a voltage source to supply the series circuit of the sensing metal ring 121 and the resistor. Then, the voltage detection port of the TCON, also known as the input / output port / IO port (A1, A2, A3…), is used to identify the voltage (V1, V2, V3…) of the fixed resistor 122. By adjusting the grayscale voltage of the extinction area transmitted by the TCON to the source driver, V1~V4 can be adjusted according to a fixed voltage difference (e.g., ...). Figure 9 The TCON I / O ports have fixed thresholds for determining H and L. By detecting V1~V4, the TCON I / O ports detect that A1~A14 will have different H / L values. When the temperature is different, the voltage of V1~V4 will also be different. In this way, the H / L conditions of A1~A4 can be used to represent different temperatures.

[0049] Of course, in specific manufacturing processes, in commonly used display panels 200, the display control module 110 typically has 14 corresponding ports. The I / O ports of the TCON are A1 to A14 to identify the voltage (V1, V2, V3…V14) of the fixed resistor 122. By adjusting the grayscale of the cancellation area transmitted by the TCON to the source driver, V1~V14 can be controlled according to a fixed voltage difference (e.g., ...). Figure 9 The TCON I / O ports have fixed threshold voltages for determining H and L. By detecting V1~V14, the TCON I / O ports detect that A1~A14 will have different H / L values. When the temperature is different, the voltages of V1~V14 will also be different. In this way, the H / L conditions of A1~A14 can be used to represent different temperatures.

[0050] refer to Figure 7As shown, this fourth embodiment of the present application is a further refinement of any of the above embodiments. Taking the first embodiment as an example, the temperature detection circuit 100 includes a display control module 110, a temperature detection module 120, a timing control module 130, a storage module 140, and a power supply voltage output control module 160. The timing control module 130, the power supply voltage output control module 160, the power chip 170, and the storage module 140 are generally disposed on the same circuit board 180. The temperature detection module 120 is disposed on the display panel 200 and connected to the second output channel 112 of the display control module 110. The timing control module 130 is connected to the temperature detection module 120 via... The display control module 110 is connected to the power supply voltage output control module 160, which is connected to the temperature detection module 120 and the power chip 170 respectively. When the temperature detection module 120 starts temperature detection, if the detected temperature is greater than the preset temperature value, the connection with the power chip 170 is disconnected and the power supply voltage is no longer input to the display panel 200. If the detected temperature is less than the preset temperature value, the first output channel 111 outputs the first gray level voltage to the data line of the display panel 200. The timing control module 130 outputs the corresponding second gray level voltage to the second output channel 112 of the display control module 110 based on the first lookup table, so as to output to the temperature detection module 120 to start temperature detection.

[0051] Considering that the components may burn out when the temperature of the display panel 200 rises to a certain level, a burnout prevention module, namely the power supply voltage output control module 160, is further provided. The power supply voltage output control module 160 is connected to the temperature detection module 120 and the power chip 170 respectively. The output terminal controls the voltage input to the display control module 110, the timing control module 130 and other modules, thereby controlling the power supply voltage input to the display panel 200. When the temperature detection module 120 starts temperature detection, if the detected temperature is greater than the preset temperature value, it disconnects from the power chip 170 and no longer inputs voltage to the display control module 110, the timing control module 130 and other modules, so that the power supply voltage cannot be output to the display panel 200.

[0052] like Figure 8 As shown, as a fifth embodiment of this application, a temperature detection method is disclosed. The temperature detection method is used to drive the temperature detection circuit 100 as described in any of the above embodiments. The temperature detection method includes:

[0053] S1: Generate the corresponding first grayscale voltage and second grayscale voltage;

[0054] S2: Outputs the corresponding first grayscale voltage to the data line of the display panel 200; and

[0055] S3: Based on the first lookup table, output the corresponding second grayscale voltage to the second output channel 112 of the display control module 110, so as to output to the temperature detection module 120 to enable temperature detection.

[0056] In this application, the first output channel 111 and the second output channel 112 of the display control module 110 are respectively connected to the data line and the temperature detection module 120. Based on the first lookup table, the redundant output channels are used to output voltage to the temperature detection module 120 to enable temperature detection. The lookup table records the relationship between the voltage of the fixed resistor 122 and the corresponding temperature, and also records the grayscale voltage that makes the relationship between the voltage of the fixed resistor 122 and the corresponding temperature valid under different display panels 200. Based on the first lookup table, the corresponding second grayscale voltage is output to the second output channel 112 of the display control module 110 to output to the temperature detection module 120 to enable temperature detection. This avoids the situation where temperature detection is directly performed when the differences between the display panels 200 are large, which would lead to large measurement errors, and reduces the error of the temperature detection results.

[0057] like Figure 9 As shown, the sixth embodiment of this application is a further improvement and refinement of the fifth embodiment described above. Step S3 includes:

[0058] S31: Based on the design phase data of the display panel 200, formulate a first reference table for the voltage and temperature relationship of the detected fixed resistor 122;

[0059] S32: At a fixed temperature, the voltage of the fixed resistor 122 is detected in real time, and the second gray level voltage is continuously adjusted so that the detected voltage of the fixed resistor 122 is the same as the voltage of the fixed resistor 122 in the first reference sub-table, and the second gray level voltage and temperature at this time are used to make a gray level voltage adjustment sub-table.

[0060] S33: After the display panel 200 restarts, it calls the second grayscale voltage output from the grayscale voltage debugging sub-table to the second output channel 112 of the display control module 110 to enable temperature detection.

[0061] The second grayscale voltage output by the second output channel 112 is set by the grayscale voltage of the anonymized area transmitted by TCON to the source driver of the display control module 110. This allows each grayscale voltage in the product to correspond to one display panel 200 to adjust the temperature detection function, thereby reducing errors between individual products. Specifically, based on the design phase data, a correspondence table between detected voltage and temperature is first established. Then, the voltage VDC on the fixed resistor 122 is measured at different ambient temperatures. The grayscale data of the anonymized area of ​​the second output channel 112 of TCON, which is output to the source driver, is adjusted to adjust the voltage so that the VDC voltage at different ambient temperatures conforms to the aforementioned correspondence table. Subsequently, the corresponding adjusted grayscale voltage is recorded and saved to the storage module 140. After the entire machine restarts, the SOC chip retrieves the grayscale voltage of the anonymized area from the storage module 140, thereby enabling the temperature detection function. Through the above automatic adjustment of the grayscale voltage of the anonymized area, each product can ensure that the temperature detection results are consistent with the correspondence table, thereby effectively reducing errors when detecting the temperature on the display panel 200.

[0062] like Figure 10 As shown, as the seventh embodiment of this application, a display device 300 is disclosed. The display device 300 includes a temperature detection circuit 100 and a display panel 200 as described in any of the above embodiments. The temperature detection circuit 100 uses the temperature detection method described in the above embodiments to detect the temperature of the display panel 200.

[0063] It should be noted that the limitations on the steps involved in this solution, without affecting the implementation of the specific solution, are not considered as limiting the order of the steps. That is, the steps listed first can be performed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the protection scope of this application. The inventive concept of this application can form many embodiments, but due to space limitations in the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. The combination of embodiments or technical features will enhance the original technical effect.

[0064] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A temperature detection circuit for temperature detection of a display panel, characterized by, The temperature detection circuit comprises: The display control module comprises a first output channel and a second output channel; The temperature detection module is arranged on the display panel and is connected to the second output channel of the display control module; The timing control module is connected to the temperature detection module and the display control module respectively; and The storage module is connected to the temperature detection module and the timing control module and stores a first lookup table; The first output channel outputs a first gray scale voltage to a data line of the display panel, the timing control module outputs a corresponding second gray scale voltage to the second output channel of the display control module based on the first lookup table, and the second gray scale voltage is output to the temperature detection module to start temperature detection. The temperature detection module comprises a sensing metal ring and a fixed resistor, one end of the sensing metal ring is connected to the second output channel, the other end of the sensing metal ring is connected to the fixed resistor, one end of the fixed resistor is grounded, the other end of the fixed resistor is connected to the sensing metal ring and the timing control module respectively, the second gray scale voltage is a gray scale voltage of a blanking area, the first lookup table comprises a first comparison sub-table and a gray scale voltage debugging sub-table, the first comparison sub-table is a voltage-temperature relationship table of the fixed resistor, and the gray scale voltage debugging sub-table is a gray scale voltage-temperature relationship table in which the voltage of the fixed resistor is the same as that in the first comparison sub-table at different temperatures.

2. The temperature detection circuit according to claim 1, wherein The second output channel is a redundant output channel of the display control module, the temperature detection module further comprises an analog-to-digital converter, the sensing metal ring is arranged in a non-display area of the display panel, one end of the sensing metal ring is connected to the second output channel, the other end of the sensing metal ring is grounded through the fixed resistor, one end of the analog-to-digital converter is connected between the fixed resistor and the sensing metal ring, and the other end of the analog-to-digital converter is connected to the timing control module.

3. The temperature detection circuit according to claim 1, wherein Each temperature detection module comprises a sensing metal ring and a fixed resistor, one end of the sensing metal ring is connected to the second output channel, the other end of the sensing metal ring is connected to the fixed resistor, one end of the fixed resistor is grounded, the other end of the fixed resistor is connected to the sensing metal ring, the timing control module comprises a plurality of voltage detection ports, each voltage detection port is connected between the fixed resistor and the sensing metal ring of the corresponding temperature detection module, is used to identify the value of the voltage of the fixed resistor, each voltage detection port is provided with a corresponding threshold voltage, and the comparison result of the value of the voltage of each fixed resistor and the threshold voltage of the voltage detection port represents different temperatures when the temperature detection module starts temperature detection.

4. The temperature detection circuit according to claim 3, wherein The display control module is provided with at least four voltage detection ports, and the values of the voltages of the fixed resistors identified by the voltage detection ports are V1, V2, V3 and V4, wherein V2=V1+△V, V3 = V1 + 2△V, V4 = V1 + 3△V, △V is a preset voltage difference. The corresponding second grayscale voltage is selected for different display control modules and output to the second output channel of the display control module to enable temperature detection of the temperature detection module.

5. The temperature detection circuit according to any one of claims 1 to 4, wherein The second grayscale voltage is the grayscale voltage of the blanking area. The temperature detection circuit also includes a polarity switching module. When the display panel enters the blanking area, the polarity switching module turns off the polarity switching of the grayscale voltage in the blanking area. The second output channel of the display control module receives the second grayscale voltage and outputs it to the temperature detection module to turn on temperature detection. Before the blanking area ends, after the temperature detection ends, the polarity switching module turns on the polarity switching of the grayscale voltage.

6. The temperature detection circuit according to claim 5, wherein The temperature detection circuit includes a power supply voltage output control module, which is connected to the temperature detection module and the power chip respectively. When the temperature detection module starts temperature detection, if the detected temperature is greater than the preset temperature value, the connection with the power chip is disconnected and no more power supply voltage is input to the display panel.

7. A temperature detection method, comprising: A temperature detection circuit as described in any one of claims 1-6 is used to detect the temperature of a display panel, the temperature detection method comprising: Generate the corresponding first grayscale voltage and second grayscale voltage; Output the corresponding first grayscale voltage to the data line of the display panel; and Based on the first lookup table, the corresponding second grayscale voltage is output to the second output channel of the display control module, so as to output to the temperature detection module to enable temperature detection.

8. The temperature detecting method according to claim 7, wherein The step of outputting the corresponding second grayscale voltage based on the first lookup table to the second output channel of the display control module, so as to output to the temperature detection module to enable temperature detection, includes: Based on the design phase data of the display panel, a first reference table was created to determine the voltage and temperature relationship of the detected fixed resistors. At a fixed temperature, the voltage of the fixed resistor is detected in real time, and the second gray level voltage is continuously adjusted so that the detected voltage of the fixed resistor is the same as the voltage of the fixed resistor in the first reference sub-table. The second gray level voltage and temperature at this time are used to make a gray level voltage adjustment sub-table. After the display panel restarts, the second grayscale voltage output in the grayscale voltage debugging sub-table is called and sent to the second output channel of the display control module to enable temperature detection.

9. A display device, characterized by comprising: The device includes a temperature detection circuit and a display panel as described in any one of claims 1-6, wherein the temperature detection circuit uses the temperature detection method as described in any one of claims 7-8 to detect the temperature of the display panel.

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