CN220474328U - Power supply adjusting device and liquid crystal display device - Google Patents
Power supply adjusting device and liquid crystal display device Download PDFInfo
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- CN220474328U CN220474328U CN202322197256.3U CN202322197256U CN220474328U CN 220474328 U CN220474328 U CN 220474328U CN 202322197256 U CN202322197256 U CN 202322197256U CN 220474328 U CN220474328 U CN 220474328U
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Abstract
The utility model discloses a liquid crystal display device, a power supply adjusting device, the power supply adjusting device includes: the source electrode driving chip is used for driving the display panel; the built-in power supply module is arranged inside the source electrode driving chip and is used for supplying power to the source electrode driving chip; the external power supply module is arranged outside the source electrode driving chip and is used for supplying power to the source electrode driving chip; the selection module comprises: the control unit outputs a corresponding control signal according to the ambient temperature; the control end of the first switching tube is connected to the first conducting end of the second switching tube, the control end of the second switching tube receives an input signal, wherein the control signal is connected to the first switching tube and the middle node of the second switching tube, when the control signal is effective, the second switching tube is conducted, the external power supply module supplies power to the source electrode driving chip, and when the control signal is ineffective, the internal power supply module supplies power to the source electrode driving chip. So that the internal heat generation of the source electrode driving chip is reduced under a high-temperature environment.
Description
Technical Field
The present utility model relates to the field of liquid crystal displays, and more particularly to a power supply adjusting device and a liquid crystal display.
Background
In recent years, a liquid crystal display is widely used as a large outdoor/indoor display, and the outdoor use means that the liquid crystal display can normally operate not only at room temperature but also at a temperature lower than minus 30 degrees celsius or higher than minus 60 degrees celsius.
The source driving chip is a key element for driving the liquid crystal display. It plays a vital role in the liquid crystal display technology, and can control the orientation of liquid crystal molecules, thereby realizing the display of images. However, the existing source electrode driving chip comprising the built-in power supply module works under the high temperature condition and approaches to the operating temperature of the chip, so that the source electrode driving chip works at risk.
Disclosure of Invention
In view of the foregoing, an object of the present utility model is to provide a liquid crystal display device and a power supply adjusting device, which solve the foregoing problems.
According to an aspect of the present utility model, there is provided a power supply adjusting apparatus including:
a source driving chip for driving the display panel;
the built-in power supply module is arranged inside the source electrode driving chip and supplies power to the source electrode driving chip;
the external power supply module is arranged outside the source electrode driving chip and supplies power to the source electrode driving chip;
the selection module is respectively connected with the internal power supply module and the external power supply module, adjusts the internal power supply module or the external power supply module to supply power to the source electrode driving chip according to the ambient temperature of the source electrode driving chip,
wherein the selection module comprises: the control unit outputs a corresponding control signal according to the ambient temperature of the source electrode driving chip; and a first switching tube and a second switching tube connected in series between the output end and the ground, wherein the control end of the first switching tube is connected to the first conduction end of the second switching tube, the control end of the second switching tube receives an input signal,
the control signal is connected to the middle node of the first switching tube and the second switching tube, the input signal is kept effective, when the control signal is effective, the second switching tube is conducted, the effective state of the control signal is output to the output end, the external power supply module supplies power to the source electrode driving chip, when the control signal is ineffective, the second switching tube is turned off, the output end is grounded, and the internal power supply module supplies power to the source electrode driving chip.
Optionally, the first switching tube is an N-type transistor, and the second switching tube is a P-type transistor.
Optionally, the method further comprises: the power supply reset module is arranged inside the source electrode driving chip and resets the source electrode driving chip according to the state change of the control signal.
Optionally, when the control signal drops to a preset voltage, the power reset module resets the source driver chip.
Optionally, the external power supply module further comprises a power supply switching module, and the external power supply module is enabled according to the control signal.
Optionally, the power switching module includes: the enabling pin is connected with the input end of the input signal and used for controlling the level of the input signal;
the fourth switching tube is connected between the input signal and the grounding end, the control end of the fourth switching tube receives the input signal, the fifth switching tube is connected between the input signal and a power supply voltage signal superposition node of the external power supply module, the control end of the fifth switching tube is connected with the first conducting end of the fourth switching tube,
the power supply switching module controls the input signal level through the enabling pin, so that a power supply voltage signal superposition node of the external power supply module is in a high-resistance state.
Optionally, the fourth switching tube is an N-type transistor, and the fifth switching tube is a P-type transistor.
According to another aspect of the present utility model, there is provided a power supply adjusting apparatus including:
a source driving chip for driving the display panel;
the built-in power supply module is arranged inside the source electrode driving chip and supplies power to the source electrode driving chip;
the external power supply module is arranged outside the source electrode driving chip and supplies power to the source electrode driving chip;
the selection module adjusts the built-in power supply module or the external power supply module to supply power to the source electrode driving chip according to the ambient temperature of the source electrode driving chip,
wherein the selection module comprises:
a first resistor, a second resistor, a third resistor, a thermistor, a comparator and a third switch tube,
the third resistor and the thermistor are connected in series between the grounding end and the input signal, and the thermistor is connected with the intermediate node of the input signal and the non-inverting input end of the comparator;
the first resistor and the second resistor are connected in series between the input signal and the ground, the intermediate node of the first resistor and the second resistor is connected with the inverting input terminal of the comparator,
the output end of the comparator is connected to the control end of the third switching tube, the output end of the selection module is connected between the first conducting end of the third switching tube and the input signal, and the comparator controls the on and off of the third switching tube according to the resistance change of the thermistor.
According to another aspect of the present utility model, there is provided a liquid crystal display device including the above power supply adjusting device and a display panel.
According to the power supply adjusting device provided by the utility model, the built-in power supply module or the external power supply module is adjusted to supply power to the source electrode driving chip according to the ambient temperature of the source electrode driving chip, so that the internal heating of the source electrode driving chip is reduced.
Drawings
The above and other objects, features and advantages of the present utility model will become more apparent from the following description of embodiments of the present utility model with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a power supply adjusting device according to a first embodiment of the present utility model.
Fig. 2 is a circuit diagram of a selection module in a power supply adjusting device according to a first embodiment of the present utility model.
Fig. 3 is a simplified control block diagram of a power supply adjusting device according to a second embodiment of the present utility model.
Fig. 4 is a signal timing diagram of a power supply adjusting device according to a second embodiment of the present utility model.
Fig. 5 is a circuit diagram of a selection module in a power supply adjusting device according to a second embodiment of the present utility model.
Fig. 6 is a circuit diagram of a power reset module in a power adjustment device according to an embodiment of the present utility model.
Fig. 7 is a circuit diagram of a built-in power module in a power supply adjusting device according to an embodiment of the utility model.
Detailed Description
Various embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. The same elements or modules are denoted by the same or similar reference numerals in the various figures. For clarity, the various features of the drawings are not drawn to scale.
It should be appreciated that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and/or elements capable of storing instructions for execution by the programmable circuits.
Also, certain terms are used throughout the description and claims to refer to particular components. It will be appreciated by those of ordinary skill in the art that a hardware manufacturer may refer to the same component by different names. The present patent specification and claims do not take the form of an element or components as a functional element or components as a rule.
Furthermore, it should be noted that relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 is a schematic structural view of a power supply adjusting device according to a first embodiment of the present utility model. As shown in fig. 1, the power supply adjusting device includes a selection module 101, an external power supply module 102, and an internal power supply module 103;
the built-in power supply module 103 is arranged inside the source electrode driving chip, supplies power to the source electrode driving chip inside the source electrode driving chip, the external power supply module 102 is arranged outside the source electrode driving chip, supplies power to the source electrode driving chip outside the source electrode driving chip, and the source electrode driving chip is internally provided with the time sequence controller 104 for providing control signals for the display panel. The selection module 101 adjusts the internal power module 103 or the external power module 102 to supply power to the source driving chip according to the ambient temperature of the source driving chip.
Fig. 2 is a circuit diagram of a selection module in a power supply adjusting device according to a first embodiment of the present utility model.
As shown in fig. 2, the selection module 101 in the power supply adjusting device includes a Control unit 1011 configured to output a corresponding Control signal Control according to a test environment temperature, where the Control unit includes a first switching tube Q1 and a second switching tube Q2 connected in series between an output end and ground, a first conducting end of the second switching tube Q2 is further connected to a Control end of the first switching tube Q1, and a Control end of the second switching tube Q2 receives an input signal Vin, where the Control signal Control is connected to an intermediate node of the first switching tube Q1 and the second switching tube Q2.
The first switching tube Q1 is, for example, an N-type switching tube, the second switching tube Q2 is, for example, a P-type switching tube, pull-down resistors R2 and R3, and a diode D1 for accelerating the turn-off of the first switching tube Q1 and the second switching tube Q2 are further provided at each node of the switching tube, and according to the actual situation, the above-mentioned components can be adjusted by those skilled in the art, which is not limited in this application.
The input signal Vin is kept valid, that is, the first switching tube Q1 is kept in a conductive state all the time in the selection module, when the Control signal Control is in a valid state (low level), the second switching tube Q2 is conductive, the valid state of the Control signal Control is connected to the output end, and at this time, the corresponding power supply mode is to supply power to the source driving chip for the external power supply module 102; when the Control signal Control is in an inactive state (high level), the second switching tube Q2 is turned off, and the output terminal is grounded, and at this time, the corresponding power supply mode is that the built-in power supply module 103 supplies power to the source driving chip.
Fig. 3 is a simplified control block diagram of a power supply adjusting device according to a second embodiment of the present utility model.
As shown in fig. 3, corresponding to the Control state of the Control unit 1011 in the above circuit diagram, when the Control unit 1011 outputs the corresponding Control signal Control to be low according to the test environment temperature, the external power module 102 supplies power to the source driving chip, and when the Control signal Control is high, the external power module 102 supplies power to the source driving chip.
Fig. 4 is a signal timing diagram of a power supply adjusting device according to a second embodiment of the present utility model.
As shown in fig. 1 and fig. 4, the power supply adjusting device further includes a power supply Reset module 105 disposed inside the source driver chip and configured to Reset the source driver chip according to the state change of the Control signal, specifically, when the working temperature of the source driver chip reaches a certain temperature, the state of the Control signal Control is Reset inside the source driver chip when Reset detects that the Control voltage is powered down to 2.5V in the switching process, so as to realize the selection of the internal and external power supply modules.
Fig. 5 is a circuit diagram of a selection module in a power supply adjusting device according to a second embodiment of the present utility model.
As shown in fig. 5, in another embodiment, the selection module 101 in the power supply adjustment device includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a thermistor Rt, a comparator, and a third switching tube Q3. The resistor R4 and the thermistor Rt are connected in series between the grounding end and the input signal Vin, the resistor R1 and the resistor R2 are connected in series between the input signal Vin and the grounding end, a node between the thermistor Rt and the input signal Vin is connected with the non-inverting input end of the comparator, and an intermediate node between the resistor R1 and the resistor R2 is connected with the inverting input end of the comparator. The output end of the comparator is connected to the control end of the switching tube Q3, and in one embodiment, the switching tube Q3 is a P-type switching tube.
Specifically, when the power supply adjusting device works in a high-temperature environment, the resistance value of the thermistor Rt is reduced, the voltage of the non-inverting input end is smaller than that of the inverting input end at the moment, the switching tube Q3 is conducted by the low level output by the output end of the comparator after comparison of the comparator, the external power supply module 102 is connected to a circuit, and the source electrode driving chip is powered by the external power supply module 102.
Fig. 6 is a circuit diagram of a power reset module in a power adjustment device according to an embodiment of the present utility model.
As seen in fig. 1 in combination with fig. 6, the power regulating device further comprises a power switching module 106,
the power switching module 106 includes enable pins ENN and ENP for the input signal Vin, and is connected to an input terminal of the input signal Vin for controlling a level of the input signal Vin. The power switching module 106 further includes a fourth switching tube Q4 and a fifth switching tube Q5, the fourth switching tube Q4 is connected between the input signal Vin and the ground terminal, the control terminal of the fourth switching tube Q4 receives the input signal Vin, the fifth switching tube Q5 is connected between the input signal Vin and a power voltage signal superposition node of the external power module 102, the power voltage signal of the external power module 102 includes VSP/VSN/VGH/VGL, the fourth switching tube Q4 is an N-type switching tube, and the fifth switching tube Q5 is a P-type switching tube.
Specifically, when the input signal Vin is connected to the enable pin, the input signal Vin is, for example, 0V, the fourth switching tube Q4 and the fifth switching tube Q5 are not turned on, and the output of the superposition node a is low level, so that the power voltage signal VSP/VSN/VGH/VGL of the external power module 102 can be in a high-impedance state, and the internal power module can be used to supply power to the source driving chip.
Fig. 7 is a circuit diagram of a built-in power module in a power supply adjusting device according to an embodiment of the utility model.
As shown in fig. 7, the circuit diagram of the built-in power supply module 103, the power supply voltage signal of the built-in power supply module 103 includes, for example, VSP/VSN/VGH/VGL, where VSP/VSN is controlled by driving signals DRVP and DRVN, respectively, and the above circuit diagram is merely an example, and the present application can also be adjusted according to practical situations.
In the above embodiments, the first conductive terminal is, for example, a source, and the second conductive terminal is, for example, a drain.
In still another embodiment of the present utility model, a liquid crystal display device is provided, including the above power supply adjusting device and a display panel, where the power supply adjusting device adjusts a power supply mode of the source driving chip according to an ambient temperature.
It should be noted that the words "during", "when" and "when … …" as used herein in relation to circuit operation are not strict terms indicating an action that occurs immediately upon the start of a start-up action, but rather there may be some small but reasonable delay or delays between it and the reaction action (reaction) initiated by the start-up action, such as various transmission delays and the like, as will be appreciated by those of ordinary skill in the art. The word "about" or "substantially" is used herein to mean that an element value (element) has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there is always a slight deviation such that the value or position is difficult to strictly assume the stated value. It has been well established in the art that deviations of at least ten percent (10%) (at least twenty percent (20%)) for semiconductor doping concentrations are reasonable deviations from the exact ideal targets described. When used in connection with a signal state, the actual voltage value or logic state of the signal (e.g., "1" or "0") depends on whether positive or negative logic is used.
Embodiments in accordance with the present utility model, as described above, are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model and various modifications as are suited to the particular use contemplated. The scope of the utility model should be determined by the appended claims and their equivalents.
Claims (9)
1. A power supply adjustment device, comprising:
a source driving chip for driving the display panel;
the built-in power supply module is arranged inside the source electrode driving chip and supplies power to the source electrode driving chip;
the external power supply module is arranged outside the source electrode driving chip and supplies power to the source electrode driving chip;
the selection module is respectively connected with the internal power supply module and the external power supply module, adjusts the internal power supply module or the external power supply module to supply power to the source electrode driving chip according to the ambient temperature of the source electrode driving chip,
wherein the selection module comprises: the control unit outputs a corresponding control signal according to the ambient temperature of the source electrode driving chip; and a first switching tube and a second switching tube connected in series between the output end and the ground, wherein the control end of the first switching tube is connected to the first conduction end of the second switching tube, the control end of the second switching tube receives an input signal,
the control signal is connected to the middle node of the first switching tube and the second switching tube, the input signal is kept effective, when the control signal is effective, the second switching tube is conducted, the effective state of the control signal is output to the output end, the external power supply module supplies power to the source electrode driving chip, when the control signal is ineffective, the second switching tube is turned off, the output end is grounded, and the internal power supply module supplies power to the source electrode driving chip.
2. The power supply adjustment device according to claim 1, wherein the first switching transistor is an N-type transistor and the second switching transistor is a P-type transistor.
3. The power supply adjustment device according to claim 2, characterized by further comprising: the power supply reset module is arranged inside the source electrode driving chip and resets the source electrode driving chip according to the state change of the control signal.
4. The power supply adjustment device according to claim 3, wherein the power supply reset module resets the source driver chip when the control signal drops to a preset voltage.
5. The power conditioning device of claim 1, further comprising a power switching module that enables the external power module based on the control signal.
6. The power conditioning device of claim 5, wherein the power switching module comprises:
the enabling pin is connected with the input end of the input signal and used for controlling the level of the input signal;
the fourth switching tube is connected between the input signal and the grounding end, the control end of the fourth switching tube receives the input signal, the fifth switching tube is connected between the input signal and a power supply voltage signal superposition node of the external power supply module, the control end of the fifth switching tube is connected with the first conducting end of the fourth switching tube,
the power supply switching module controls the input signal level through the enabling pin, so that a power supply voltage signal superposition node of the external power supply module is in a high-resistance state.
7. The power supply adjusting device according to claim 6, wherein the fourth switching transistor is an N-type transistor and the fifth switching transistor is a P-type transistor.
8. A power supply adjustment device, comprising:
a source driving chip for driving the display panel;
the built-in power supply module is arranged inside the source electrode driving chip and supplies power to the source electrode driving chip;
the external power supply module is arranged outside the source electrode driving chip and supplies power to the source electrode driving chip;
the selection module adjusts the built-in power supply module or the external power supply module to supply power to the source electrode driving chip according to the ambient temperature of the source electrode driving chip,
wherein the selection module comprises:
a first resistor, a second resistor, a third resistor, a thermistor, a comparator and a third switch tube,
the third resistor and the thermistor are connected in series between the grounding end and the input signal, and the thermistor is connected with the intermediate node of the input signal and the non-inverting input end of the comparator;
the first resistor and the second resistor are connected in series between the input signal and the ground, the intermediate node of the first resistor and the second resistor is connected with the inverting input terminal of the comparator,
the output end of the comparator is connected to the control end of the third switching tube, the output end of the selection module is connected between the first conducting end of the third switching tube and the input signal, and the comparator controls the on and off of the third switching tube according to the resistance change of the thermistor.
9. A liquid crystal display device comprising the power supply adjusting device according to any one of claims 1 to 8 and a display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322197256.3U CN220474328U (en) | 2023-08-16 | 2023-08-16 | Power supply adjusting device and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322197256.3U CN220474328U (en) | 2023-08-16 | 2023-08-16 | Power supply adjusting device and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220474328U true CN220474328U (en) | 2024-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322197256.3U Active CN220474328U (en) | 2023-08-16 | 2023-08-16 | Power supply adjusting device and liquid crystal display device |
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|---|---|
| CN (1) | CN220474328U (en) |
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2023
- 2023-08-16 CN CN202322197256.3U patent/CN220474328U/en active Active
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