Voltage regulation circuit, display module and display device

Abstract

The invention provides a voltage regulation circuit, a display module and a display device, relates to the technical field of display, and aims to solve the problem that when the temperature in the environment where a display product is applied changes, the adverse effect on the reliability and image quality of the display product is generated. In the voltage regulating circuit, a first end of a thermistor is coupled with a reference voltage signal input end, a second end of the thermistor is coupled with a collector electrode of a first triode, and the resistance value of the thermistor changes along with the change of the environment temperature; the base electrode of the first triode is coupled with the collector electrode of the first triode, and the emitter electrode of the first triode is coupled with the emitter electrode of the second triode; the base electrode of the second triode is coupled with the collector electrode of the second triode; the first end of the current limiting circuit is coupled with the reference voltage signal input end, and the second end of the current limiting circuit is coupled with the collector of the second triode; the collector electrode of the second triode is coupled with the input end of the operational amplifier circuit, and the output end of the operational amplifier circuit is coupled with the output end of the voltage regulation circuit.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular, to a voltage regulation circuit, a display module, and a display device. Background Art

[0002] With the continuous development of display technology, the types of display products are increasing, and the application fields are also becoming more and more extensive. Therefore, people have higher and higher requirements for the display quality of display products. However, when the temperature in the environment where the display product is applied changes, the characteristics of the driving transistors inside the display panel will change accordingly, resulting in changes in parameters such as the leakage current and mobility of the driving transistors, and thus causing problems such as poor reliability and picture quality of the display product. Summary of the Invention

[0003] The purpose of the present invention is to provide a voltage regulation circuit, a display module, and a display device, which are used to solve the adverse effects on the reliability and picture quality of the display product when the temperature in the environment where the display product is applied changes.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] The first aspect of the present invention provides a voltage regulation circuit, including: a thermistor, a first triode, a second triode, a current limiting circuit, and an operational amplifier circuit;

[0006] The first end of the thermistor is coupled to the reference voltage signal input terminal, the second end of the thermistor is coupled to the collector of the first triode, and the resistance value of the thermistor changes with the temperature of its application environment;

[0007] The base of the first triode is coupled to the collector of the first triode, and the emitter of the first triode is coupled to the emitter of the second triode; the base of the second triode is coupled to the collector of the second triode;

[0008] The first end of the current limiting circuit is coupled to the reference voltage signal input terminal, and the second end of the current limiting circuit is coupled to the collector of the second triode;

[0009] The collector of the second triode is coupled to the input terminal of the operational amplifier circuit, and the output terminal of the operational amplifier circuit is coupled to the output terminal of the voltage regulation circuit.

[0010] Optionally, the operational amplifier circuit includes an operational amplifier, a second resistor, and a third resistor;

[0011] The non-inverting input terminal of the operational amplifier is coupled to the collector of the second triode;

[0012] The first end of the second resistor is coupled to the ground signal input terminal, and the second end of the second resistor is coupled to the inverting input terminal of the operational amplifier; the first end of the third resistor is coupled to the inverting input terminal of the operational amplifier, and the second end of the third resistor is coupled to the output terminal of the operational amplifier; the output terminal of the operational amplifier is coupled to the output terminal of the voltage regulation circuit.

[0013] Optionally, the current limiting circuit includes a fourth resistor, the first end of the fourth resistor is coupled to the reference voltage signal input terminal, and the second end of the fourth resistor is coupled to the collector of the second triode.

[0014] Optionally, the voltage regulation circuit includes a first voltage regulation circuit, the thermistor in the first voltage regulation circuit includes a negative temperature coefficient thermistor, and the output terminal of the voltage regulation circuit is used to output a first level signal.

[0015] Optionally, the voltage regulation circuit includes a second voltage regulation circuit, the thermistor in the second voltage regulation circuit includes a positive temperature coefficient thermistor, and the output terminal of the voltage regulation circuit is used to output a second level signal.

[0016] Based on the technical solution of the above voltage regulation circuit, the second aspect of the present invention provides a display module, including the above voltage regulation circuit. The display module further includes a driving chip. The thermistor in the voltage regulation circuit is independent of the driving chip, and other circuit structures in the voltage regulation circuit except the thermistor are integrated inside the driving chip.

[0017] Optionally, the display module includes a chip on film, the thermistor and the driving chip are both disposed on the chip on film, and the area of the chip on film carrying the thermistor includes a hollowed-out area.

[0018] Optionally, the display module includes a first voltage regulation circuit and / or a second voltage regulation circuit.

[0019] The thermistor in the first voltage regulation circuit and / or the thermistor in the second voltage regulation circuit is independent of the driving chip, and other circuit structures in the first voltage regulation circuit except the thermistor and / or other circuit structures in the second voltage regulation circuit except the thermistor are both integrated inside the driving chip;

[0020] The area of the chip on film carrying the thermistor in the first voltage regulation circuit includes a hollowed-out area; and / or, the area of the chip on film carrying the thermistor in the second voltage regulation circuit includes a hollowed-out area.

[0021] Optionally, the display module further includes a display panel, which includes a display area and a peripheral area located around the display area; the display area includes a plurality of sub-pixel driving circuits, the peripheral area includes a gate driving circuit, the gate driving circuit includes a plurality of cascaded shift registers, the shift registers are coupled to corresponding sub-pixel driving circuits; an output end of the voltage regulating circuit is coupled to the shift registers.

[0022] Based on the technical solution of the above voltage regulating circuit, a third aspect of the present invention provides a display device, including the above display module.

[0023] In the technical solution provided by the present invention, the voltage regulating circuit includes a thermistor, a first triode, a second triode, a current limiting circuit, and an operational amplifier circuit; since the resistance value of the thermistor can change with the change of the ambient temperature, therefore, the voltage Uout output by the output end of the voltage regulating circuit can be dynamically and adaptively regulated with the change of the ambient temperature, so as to meet the actual voltage requirements under different environments.

[0024] When applying the technical solution provided by the present invention to a display module, the voltage regulating circuit can be used to provide a voltage signal for the shift register in the display panel, so that it can dynamically and adaptively provide a corresponding voltage signal for the shift register according to the temperature change of the application environment, and the shift register scans the sub-pixel driving circuit according to the voltage signal; thus ensuring the scanning yield of the shift register for the sub-pixel driving circuit, reducing the influence of the ambient temperature on the transistor gates in the sub-pixel driving circuit, and solving the adverse effects on the reliability and picture quality of the display product when the temperature changes in the environment where the display product is applied. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is the circuit schematic diagram of the voltage regulating circuit provided by the embodiment of the present invention;

[0027] Figure 2 is Figure 1 the equivalent circuit diagram of the circuit schematic diagram in

[0028] Figure 3 is the circuit schematic diagram of the first voltage regulating circuit provided by the embodiment of the present invention;

[0029] Figure 4 is the circuit schematic diagram of the second voltage regulating circuit provided by the embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the front layout of the flip-chip thin film provided by the embodiment of the present invention;

[0031] Figure 6 Schematic diagram of the back layout of the flip-chip thin film provided by the embodiment of the present invention. Detailed implementation manners

[0032] To further illustrate the voltage regulation circuit, display module and display device provided by the embodiments of the present invention, the following will be described in detail with reference to the accompanying drawings of the specification.

[0033] Please refer to Figure 1 , the embodiment of the present invention provides a voltage regulation circuit, including: a thermistor R1, a first triode Q1, a second triode Q2, a current limiting circuit 10 and an operational amplifier circuit 20;

[0034] The first end of the thermistor R1 is coupled to the reference voltage signal input terminal VREF, the second end of the thermistor R1 is coupled to the collector of the first triode Q1, and the resistance value of the thermistor R1 changes with the temperature of its application environment;

[0035] The base of the first triode Q1 is coupled to the collector of the first triode Q1, and the emitter of the first triode Q1 is coupled to the emitter of the second triode Q2; the base of the second triode Q2 is coupled to the collector of the second triode Q2;

[0036] The first end of the current limiting circuit 10 is coupled to the reference voltage signal input terminal VREF, and the second end of the current limiting circuit 10 is coupled to the collector of the second triode Q2;

[0037] The collector of the second triode Q2 is coupled to the input terminal of the operational amplifier circuit 20, and the output terminal of the operational amplifier circuit 20 is coupled to the output terminal OUT of the voltage regulation circuit.

[0038] Exemplarily, the reference voltage signal input terminal VREF is used to input a reference signal with a stable voltage value.

[0039] Exemplarily, both the first triode Q1 and the second triode Q2 are NPN triodes, but are not limited thereto.

[0040] Exemplarily, the operational amplifier circuit 20 includes an operational amplifier U1, a second resistor R2, and a third resistor R3; the non-inverting input terminal of the operational amplifier U1 is coupled to the collector of the second triode Q2; the first terminal of the second resistor R2 is coupled to the ground signal input terminal, and the second terminal of the second resistor R2 is coupled to the inverting input terminal of the operational amplifier U1; the first terminal of the third resistor R3 is coupled to the inverting input terminal of the operational amplifier U1, and the second terminal of the third resistor R3 is coupled to the output terminal of the operational amplifier U1; the output terminal of the operational amplifier U1 is coupled to the output terminal OUT of the voltage regulation circuit.

[0041] Exemplarily, the current limiting circuit 10 includes a fourth resistor R4, the first terminal of the fourth resistor R4 is coupled to the reference voltage signal input terminal VREF, and the second terminal of the fourth resistor R4 is coupled to the collector of the second triode Q2.

[0042] More specifically, the voltage Uout output by the output terminal OUT of the voltage regulation circuit provided by the embodiment of the present invention satisfies:

[0043]

[0044] wherein, R2 represents the resistance value of the second resistor, R3 represents the resistance value of the third resistor, and Up represents the voltage of the non-inverting input terminal of the operational amplifier U1.

[0045] The voltage regulation circuit provided by the embodiment of the present invention is equivalent to the connection structure as Figure 2 shown. From the KVL equation:

[0046] Up = Ube2 - Ube1 Equation 2

[0047] wherein, Ube2 represents the voltage between the base and the emitter of the second triode Q2, and Ube1 represents the voltage between the base and the emitter of the second triode Q2.

[0048] According to the triode characteristics, the collector current Ie satisfies:

[0049]

[0050] wherein, Is represents the PN junction leakage current of the triode, and Ube represents the voltage between the base and the emitter of the triode.

[0051] Combining Equation 1, Equation 2, and Equation 3 can obtain:

[0052]

[0053] wherein, R1 represents the real-time resistance value of the thermistor, U REFRepresents the voltage value of the reference voltage signal.

[0054]

[0055] Wherein, I REF Represents the collector current actually flowing through the second triode Q2, and R4 represents the resistance value of the fourth resistor.

[0056]

[0057] Obtained according to the characteristics of the thermistor R1:

[0058]

[0059] Wherein, R0 represents the initial resistance value of the thermistor, k is a constant, q is the electric charge, UT is the voltage of the thermistor, T is the working temperature, T0 is the initial temperature, and β is a constant.

[0060] Substituting Formula Two, Formula Four, and Formula Five into Formula One, we get:

[0061]

[0062] Substituting Formula Seven and Formula Eight into Formula Nine, we get:

[0063]

[0064] Simplifying Formula Ten gives Formula Eleven:

[0065]

[0066] Wherein, A3 = β; A1, A2, A3, and A4 are all constants.

[0067] Simplifying Formula Eleven gives:

[0068] Uout = -A*T + C Formula Twelve Wherein, A = (A1*A2 + A1*A4); C = A1*A3; A and C are both constants.

[0069] It can be seen from Formula Twelve that when the temperature rises, the voltage Uout output by the output terminal OUT of the voltage regulation circuit decreases.

[0070] Exemplarily, when applying the voltage regulation circuit to a display module, the display module further includes a display panel, and the display panel includes a display area and a peripheral area located around the display area; the display area includes a plurality of sub-pixel driving circuits, the peripheral area includes a gate driving circuit, the gate driving circuit includes a plurality of cascaded shift registers, and the shift registers are coupled to corresponding sub-pixel driving circuits; the output terminal OUT of the voltage regulation circuit is coupled to the shift registers.

[0071] According to the specific structure of the above voltage regulation circuit, in the voltage regulation circuit provided by the embodiment of the present invention, it includes a thermistor R1, a first triode Q1, a second triode Q2, a current limiting circuit 10, and an operational amplifier circuit 20; since the resistance value of the thermistor R1 can change with the change of the ambient temperature, therefore, the voltage Uout output by the output terminal OUT of the voltage regulation circuit can be dynamically adaptively adjusted with the change of the ambient temperature, so as to meet the actual voltage requirements in different environments.

[0072] When applying the voltage regulation circuit provided by the embodiment of the present invention to a display module, the voltage regulation circuit can be used to provide a voltage signal for the shift register in the display panel, so that it can dynamically and adaptively provide a corresponding voltage signal for the shift register according to the temperature change of the application environment, and the shift register scans the sub-pixel driving circuit according to this voltage signal; thus ensuring the scanning yield of the shift register for the sub-pixel driving circuit, reducing the influence of the ambient temperature on the transistor gates in the sub-pixel driving circuit, and solving the adverse effects on the reliability and picture quality of the display product when the temperature changes in the application environment of the display product.

[0073] As Figure 3 shown, in some embodiments, the voltage regulation circuit includes a first voltage regulation circuit, and the thermistor R1 in the first voltage regulation circuit includes a negative temperature coefficient thermistor R1 (i.e., RNTC), and the output terminal OUT of the voltage regulation circuit is used to output a first level signal.

[0074] Exemplarily, in the case where the thermistor R1 in the first voltage regulation circuit includes a negative temperature coefficient thermistor R1, the first level signal output by the output terminal OUT of the voltage regulation circuit includes a VGL signal, and the voltage of the first level signal decreases as the temperature increases.

[0075] Exemplarily, the first voltage regulation circuit can be used to provide a VGL signal for the shift register, and the shift register provides a scanning signal for the gates of the PMOS transistors included in the sub-pixel driving circuit according to this VGL signal.

[0076] The first level signal output by the first voltage regulation circuit provided in the above embodiments can be dynamically and adaptively regulated following the change of the ambient temperature, so as to meet the actual voltage requirements in different environments. When applying the first voltage regulation circuit to a display module, the first voltage regulation circuit can be used to provide a voltage signal for the shift register in the display panel, so that it can dynamically and adaptively provide a corresponding first level signal for the shift register according to the temperature change of the application environment. The shift register scans the sub-pixel driving circuit according to the first level signal; thus, the scanning yield of the shift register for the sub-pixel driving circuit is ensured, the influence of the ambient temperature on the transistor gates in the sub-pixel driving circuit is reduced, and the adverse effects on the reliability and picture quality of the display product when the temperature changes in the environment where the display product is applied are solved.

[0077] As Figure 4 shown, in some embodiments, the voltage regulation circuit includes a second voltage regulation circuit. The thermistor R1 in the second voltage regulation circuit includes a positive temperature coefficient thermistor R1 (i.e., RPTC). The output terminal OUT of the voltage regulation circuit is used to output a second level signal.

[0078] Exemplarily, when the thermistor R1 in the second voltage regulation circuit includes a positive temperature coefficient thermistor R1, the second level signal output by the output terminal OUT of the voltage regulation circuit includes a VGH signal, and the voltage of the second level signal increases with the increase of temperature.

[0079] Exemplarily, the second voltage regulation circuit can be used to provide a VGH signal for the shift register, and the shift register provides a scanning signal for the gates of the NMOS transistors included in the sub-pixel driving circuit according to the VGH signal.

[0080] It should be noted that the voltage values of the reference voltage signals accessed by the first voltage regulation circuit and the second voltage regulation circuit are different, such as: VREF1 and VREF2.

[0081] The second-level signal output by the second voltage regulation circuit provided in the above embodiments can be dynamically and adaptively regulated following the change of the ambient temperature, so as to meet the actual voltage requirements under different environments. When applying the second voltage regulation circuit to a display module, the second voltage regulation circuit can be used to provide a voltage signal for a shift register in a display panel, so that it can dynamically and adaptively provide a corresponding second-level signal for the shift register according to the temperature change of the application environment, and the shift register scans a sub-pixel driving circuit according to the second-level signal; thus ensuring the scanning yield of the shift register for the sub-pixel driving circuit, reducing the influence of the ambient temperature on the transistor gates in the sub-pixel driving circuit, and solving the adverse effects on the reliability and picture quality of the display product when the temperature changes in the environment where the display product is applied.

[0082] As Figure 5 shown, an embodiment of the present invention further provides a display module, including the voltage regulation circuit provided in the above embodiments. The display module further includes a driving chip IC. The thermistor R1 in the voltage regulation circuit is independent of the driving chip IC, and other circuit structures in the voltage regulation circuit except the thermistor R1 are integrated inside the driving chip IC.

[0083] Exemplarily, the voltage regulation circuit includes: a thermistor R1, a first triode Q1, a second triode Q2, a current limiting circuit 10, and an operational amplifier circuit 20; the thermistor R1 is independent of the driving chip IC, and the first triode Q1, the second triode Q2, the current limiting circuit 10, and the operational amplifier circuit 20 are integrated inside the driving chip IC.

[0084] In the display module provided by the embodiment of the present invention, by setting the thermistor R1 in the voltage regulation circuit to be independent of the driving chip IC, and integrating other circuit structures in the voltage regulation circuit except the thermistor R1 inside the driving chip IC; it enables the thermistor R1 to avoid being affected by other circuit structures inside the driving chip IC, ensuring the accuracy of the thermistor R1 in sensing the ambient temperature, and thus improving the stability of the output of the voltage regulation circuit.

[0085] Moreover, the above setting method not only ensures the maximum integration between the voltage regulation circuit and the driving chip IC, but also ensures the heat dissipation of the thermistor R1.

[0086] Meanwhile, the voltage Uout output at the output terminal OUT of the voltage regulation circuit provided in the above embodiment can be dynamically and adaptively regulated following the change of the ambient temperature, so as to meet the actual voltage requirements under different environments. Moreover, when applying the voltage regulation circuit provided in the embodiment of the present invention to a display module, the voltage regulation circuit can be used to provide a voltage signal for the shift register in the display panel. In this way, it can be realized that according to the temperature change of the application environment, a corresponding voltage signal is dynamically and adaptively provided for the shift register, and the shift register scans the sub-pixel driving circuit according to this voltage signal; thus ensuring the scanning yield of the shift register for the sub-pixel driving circuit, reducing the influence of the ambient temperature on the transistor gates in the sub-pixel driving circuit, and solving the adverse effects on the reliability and picture quality of the display product when the temperature changes in the environment where the display product is applied.

[0087] When the display module provided in the embodiment of the present invention includes the above voltage regulation circuit, it also has the above beneficial effects, which will not be elaborated here.

[0088] Such as Figure 6 shown, in some embodiments, it is set that the display module includes a chip-on-film (COF), the thermistor R1 and the driving chip IC are both arranged on the chip-on-film, and the area of the chip-on-film carrying the thermistor R1 includes a hollowed-out area 30.

[0089] Exemplarily, the display module includes a first voltage regulation circuit and / or a second voltage regulation circuit. The thermistor R1 in the first voltage regulation circuit and / or the thermistor R1 in the second voltage regulation circuit are independent of the driving chip IC, and other circuit structures except the thermistor R1 in the first voltage regulation circuit and / or other circuit structures except the thermistor R1 in the second voltage regulation circuit are integrated inside the driving chip IC; the area of the chip-on-film carrying the thermistor R1 in the first voltage regulation circuit includes a hollowed-out area 30; and / or, the area of the chip-on-film carrying the thermistor R1 in the second voltage regulation circuit includes a hollowed-out area 30.

[0090] Exemplarily, the thermistor R1 can be exposed in the carrying area by digging holes in the area of the chip-on-film carrying the thermistor R1.

[0091] The above setting method better ensures the heat dissipation performance of the thermistor R1 itself, ensures the accuracy of the thermistor R1 in sensing the ambient temperature, and thus improves the stability of the output of the voltage regulation circuit.

[0092] In some embodiments, the display module further includes a display panel, which includes a display area and a peripheral area located around the display area; the display area includes a plurality of sub-pixel driving circuits, the peripheral area includes a gate driving circuit, the gate driving circuit includes a plurality of cascaded shift registers, and the shift registers are coupled to corresponding sub-pixel driving circuits; the output terminal OUT of the voltage regulating circuit is coupled to the shift registers.

[0093] Exemplarily, the display area includes a plurality of sub-pixels, and the plurality of sub-pixel driving circuits included in the plurality of sub-pixels are arranged in an array. The plurality of sub-pixel driving circuits are divided into multiple rows of sub-pixel driving circuits and multiple columns of sub-pixel driving circuits. The multiple rows of sub-pixel driving circuits are arranged along a second direction, and each row of sub-pixel driving circuits includes a plurality of sub-pixel driving circuits arranged along a first direction. The multiple columns of sub-pixel driving circuits are arranged along the first direction, and each column of sub-pixel driving circuits includes a plurality of sub-pixel driving circuits arranged along the second direction. Exemplarily, the first direction and the second direction intersect. For example: the first direction includes a horizontal direction, and the second direction includes a vertical direction.

[0094] Exemplarily, the sub-pixel includes a sub-pixel driving circuit and a light-emitting element. The sub-pixel driving circuit is coupled to the anode of the light-emitting element and is configured to provide a driving signal for the light-emitting element to drive the light-emitting element to emit light.

[0095] Exemplarily, the gate driving circuit includes a plurality of cascaded shift registers, and the shift registers are coupled to each sub-pixel driving circuit in at least one corresponding row of sub-pixel driving circuits for providing a scanning signal for each sub-pixel driving circuit.

[0096] An embodiment of the present invention further provides a display device, including the display module provided in the above embodiment.

[0097] It should be noted that the display device may be: a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, or any product or component with a display function. Among them, the display device further includes a flexible circuit board, a printed circuit board, a backplane, etc.

[0098] In the display module provided by the above embodiments, by setting the thermistor R1 in the voltage regulation circuit independently of the driving chip IC, and integrating other circuit structures in the voltage regulation circuit except the thermistor R1 inside the driving chip IC; the thermistor R1 can be prevented from being affected by other circuit structures inside the driving chip IC, ensuring the accuracy of the thermistor R1 in sensing the ambient temperature, thereby improving the stability of the output of the voltage regulation circuit. Moreover, the display module provided by the above embodiments not only ensures the maximum integration between the voltage regulation circuit and the driving chip IC, but also ensures the heat dissipation of the thermistor R1.

[0099] Meanwhile, in the display module provided by the above embodiments, the voltage Uout output by the output terminal OUT of the voltage regulation circuit can be dynamically and adaptively adjusted following the change of the ambient temperature, so as to meet the actual voltage requirements under different environments. Moreover, the voltage regulation circuit can be used to provide a voltage signal for the shift register in the display panel, so that it can dynamically and adaptively provide a corresponding voltage signal for the shift register according to the temperature change of the application environment, and the shift register scans the sub-pixel driving circuit according to the voltage signal; thus ensuring the scanning yield of the shift register for the sub-pixel driving circuit, reducing the influence of the ambient temperature on the transistor gates in the sub-pixel driving circuit, and solving the adverse effects on the reliability and picture quality of the display product when the temperature changes in the application environment of the display product.

[0100] When the display device provided by the embodiments of the present invention includes the above display module, it also has the above beneficial effects, which will not be elaborated here.

[0101] It should be noted that the "same layer" in the embodiments of the present invention can refer to the film layers on the same structural layer. Or for example, the film layers in the same layer can be the film layers formed by the same film formation process for forming a specific pattern, and then the layer structure formed by patterning the film layer with the same mask through one lithography process. According to the different specific patterns, one lithography process may include multiple exposure, development or etching processes, and the specific patterns in the formed layer structure can be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

[0102] In the method embodiments of the present invention, the sequence numbers of the steps cannot be used to limit the sequence of the steps. For those of ordinary skill in the art, without creative efforts, the sequence changes of the steps are also within the protection scope of the present invention.

[0103] It should be noted that the embodiments in this specification are all described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. In particular, for method embodiments, since they are basically similar to product embodiments, they are described relatively simply, and for the relevant parts, reference can be made to the descriptions of the product embodiments.

[0104] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should have the ordinary meanings understood by those of ordinary skill in the art to which this invention belongs. The terms "first", "second" and similar terms used in this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms such as "connected", "coupled" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0105] It can be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element can be "directly" on or under the other element, or there may be intermediate elements.

[0106] In the description of the above embodiments, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0107] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A voltage regulating circuit, characterized in that: include: Thermistor, first transistor, second transistor, current limiting circuit and operational amplifier circuit; The first end of the thermistor is coupled to the reference voltage signal input end, the second end of the thermistor is coupled to the collector of the first transistor, and the resistance value of the thermistor changes with the temperature change of its application environment; The base of the first transistor is coupled to the collector of the first transistor, the emitter of the first transistor is coupled to the emitter of the second transistor; the base of the second transistor is coupled to the collector of the second transistor; A first terminal of the current limiting circuit is coupled to the reference voltage signal input terminal, and a second terminal of the current limiting circuit is coupled to the collector of the second transistor; The collector of the second transistor is coupled to the input end of the operational amplifier circuit, and the output end of the operational amplifier circuit is coupled to the output end of the voltage regulating circuit.

2. The voltage regulating circuit according to claim 1, characterized in that: The operational amplifier circuit includes an operational amplifier, a second resistor and a third resistor; The non-inverting input terminal of the operational amplifier is coupled to the collector of the second transistor; The first end of the second resistor is coupled to the ground signal input terminal, and the second end of the second resistor is coupled to the inverting input terminal of the operational amplifier; the first end of the third resistor is coupled to the inverting input terminal of the operational amplifier, and the second end of the third resistor is coupled to the output terminal of the operational amplifier; the output terminal of the operational amplifier is coupled to the output terminal of the voltage regulation circuit.

3. The voltage regulating circuit according to claim 2, characterized in that: The current limiting circuit includes a fourth resistor, a first end of the fourth resistor is coupled to the reference voltage signal input end, and a second end of the fourth resistor is coupled to the collector of the second transistor.

4. The voltage regulating circuit according to claim 1, characterized in that: The voltage regulating circuit comprises a first voltage regulating circuit, the thermistor in the first voltage regulating circuit comprises a negative temperature coefficient thermistor, and the output end of the voltage regulating circuit is used to output a first level signal.

5. The voltage regulating circuit according to claim 1, characterized in that: The voltage regulating circuit includes a second voltage regulating circuit, the thermistor in the second voltage regulating circuit includes a positive temperature coefficient thermistor, and the output end of the voltage regulating circuit is used to output a second level signal.

6. A display module, characterized in that: It comprises the voltage regulating circuit as described in any one of claims 1 to 5, the display module also comprises a driving chip, the thermistor in the voltage regulating circuit is independent of the driving chip, and other circuit structures in the voltage regulating circuit except the thermistor are integrated inside the driving chip.

7. The display module according to claim 6, characterized in that: The display module includes a chip-on-film, the thermistor and the driving chip are both arranged on the chip-on-film, and the area of ​​the chip-on-film carrying the thermistor includes a hollow area.

8. The display module according to claim 7, characterized in that: The display module includes a first voltage regulating circuit and / or a second voltage regulating circuit. The thermistor in the first voltage regulating circuit and / or the thermistor in the second voltage regulating circuit are independent of the driver chip, and other circuit structures in the first voltage regulating circuit except the thermistor and / or other circuit structures in the second voltage regulating circuit except the thermistor are integrated inside the driver chip; The area of ​​the chip-on-film that carries the thermistor in the first voltage regulating circuit includes a hollow area; and / or the area of ​​the chip-on-film that carries the thermistor in the second voltage regulating circuit includes a hollow area.

9. The display module according to any one of claims 6 to 8, characterized in that: The display module also includes a display panel, which includes a display area and a peripheral area located around the display area; the display area includes a plurality of sub-pixel driving circuits, the peripheral area includes a gate driving circuit, the gate driving circuit includes a plurality of cascaded shift registers, and the shift registers are coupled to the corresponding sub-pixel driving circuits; the output end of the voltage regulation circuit is coupled to the shift register.

10. A display device, characterized in that: It comprises the display module as claimed in any one of claims 6 to 9.

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