CN113192450A - Display device and using method - Google Patents
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- CN113192450A CN113192450A CN202110459343.4A CN202110459343A CN113192450A CN 113192450 A CN113192450 A CN 113192450A CN 202110459343 A CN202110459343 A CN 202110459343A CN 113192450 A CN113192450 A CN 113192450A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
Abstract
The invention discloses a display device and a using method thereof, wherein the display device of one embodiment comprises: the display device comprises a power management unit, a driving chip, a display panel and a protection unit, wherein the driving chip carries out level conversion according to an analog power voltage signal output by the power management unit to generate a first voltage signal and a second voltage signal, a parasitic diode is arranged between the first voltage signal and the second voltage signal, and the second voltage signal is used for driving the display panel; the protection unit is used for acting according to the voltage difference of the first voltage signal and the second voltage signal so as to prevent the parasitic diode from being conducted. According to the display device provided by the invention, the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to avoid the conduction of the parasitic diode, so that the problem of overlarge voltage of the analog power supply caused by the fact that the time sequence of the two voltage signals cannot be stably controlled in the prior art is solved, and the display device has a wide application prospect.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a method for using the same.
Background
With the improvement of living standards, users have higher and higher requirements for the working performance of display devices. As the performance requirements for display devices are getting higher, how to improve the display and driving performance of display devices is a common concern for developers and users.
Disclosure of Invention
In order to solve at least one of the above problems, a first embodiment of the present invention provides a display device including a power management unit, a driving chip, a display panel, and a protection unit, wherein:
the driving chip performs level conversion according to the analog power supply voltage signal output by the power supply management unit to generate a first voltage signal and a second voltage signal, a parasitic diode is arranged between the first voltage signal and the second voltage signal, and the second voltage signal is used for driving the display panel;
the protection unit is used for acting according to the voltage difference of the first voltage signal and the second voltage signal so as to prevent the parasitic diode from being conducted.
Further, the protection unit includes a comparator and a gate switch, wherein
The comparator comprises a first input end, a second input end and an output end, wherein the first input end is connected with the first voltage signal, the second input end is connected with the second voltage signal, and the comparator compares the difference value of the first voltage signal and the second voltage signal according to a preset voltage difference threshold value and outputs the comparison result from the output end;
the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal, the gating second input end is connected to the preset voltage signal, and the gating switch selectively outputs the second voltage signal or the preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
Further, the comparator outputs a first comparison result when the second voltage signal is greater than the first voltage signal and the voltage difference between the first voltage signal and the second voltage signal is greater than the preset voltage difference threshold, and otherwise outputs a second comparison result.
Further, the gating switch outputs the preset voltage signal to the display panel according to the input first comparison result to prevent the parasitic diode from being conducted; or
The gate switch outputs the second voltage signal to the display panel according to an input second comparison result to drive the display panel.
Further, the protection unit includes a protection diode, a turn-on voltage of the protection diode is smaller than a turn-on voltage of the parasitic diode, and the protection unit turns on the protection diode according to a voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from turning on;
the protection diode comprises an anode and a cathode, the anode of the protection diode is electrically connected with the second voltage signal, and the cathode of the protection diode is electrically connected with the first voltage signal.
Further, the protection diode is a schottky diode.
Further, the protection unit is disposed in the driving chip.
A second embodiment of the present invention provides a method for displaying using the display device, including:
the power supply management unit outputs an analog power supply voltage signal to the driving chip;
the driving chip carries out level conversion according to the analog power supply voltage signal to generate a first voltage signal and a second voltage signal, a parasitic diode exists between the first voltage signal and the second voltage signal, and the second voltage signal is used for driving the display panel;
the protection unit acts according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from being conducted.
Further, the protection unit includes a comparator and a gating switch, where the comparator includes a first input terminal, a second input terminal, and an output terminal, where the first input terminal is connected to the first voltage signal, and the second input terminal is connected to the second voltage signal; the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal, and the gating second input end is connected to a preset voltage signal; the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the comparator compares the difference value of the first voltage signal and the second voltage signal according to a preset voltage difference threshold value and outputs a comparison result from the output end;
and the gating switch selectively outputs a second voltage signal or a preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
Further, the protection unit includes a protection diode, a turn-on voltage of the protection diode is smaller than a turn-on voltage of the parasitic diode, the protection diode includes an anode and a cathode, the anode of the protection diode is electrically connected with the second voltage signal, and the cathode of the protection diode is electrically connected with the first voltage signal; the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the protection unit conducts the protection diode according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from conducting.
The invention has the following beneficial effects:
aiming at the existing problems, the invention sets a display device, the protection unit acts according to the voltage difference of the first voltage signal and the second voltage signal to avoid the conduction of a parasitic diode, the problem of overlarge voltage of an analog power supply caused by the fact that the time sequence of the two voltage signals cannot be stably controlled in the prior art is solved, the display panel is effectively protected, and the display device has wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram illustrating a display device in which a protection unit is disposed outside a driving chip according to an embodiment of the present invention;
fig. 2 is a block diagram showing a structure of a display device in which a protection unit is provided in a driving chip according to another embodiment of the present invention;
fig. 3 is a block diagram showing a protection unit according to another embodiment of the present invention, including a comparator and a gate switch;
fig. 4 shows a block diagram of a protection unit including a protection diode according to another embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for displaying by using the display device shown in fig. 1 according to another embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
It is to be noted that the relational terms such as first and second, and the like, described herein 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For the problem of how to improve the driving performance and the display performance of the display device, the inventor finds, through a lot of experiments and researches, that the phenomenon that the analog power supply voltage signal of the power supply of the display device is too large has a serious influence on the driving performance and the display performance of the display device, and further finds the reason of the phenomenon after researching the phenomenon and proposes:
the ideal process for driving the display panel by the power management unit is as follows: the power management unit outputs an analog power voltage signal, and generates a first voltage signal AVEE and a second voltage signal VGL after level conversion, in an ideal state, the output time sequence of the first voltage signal should be earlier than that of the second voltage signal, and the first voltage signal is greater than the second voltage signal.
Based on the above research and findings, embodiments of the present invention provide a display device and a method of using the same to solve the above problems.
As shown in fig. 1, a first embodiment of the present invention proposes a display device including: power management unit, driver chip, display panel and protection unit, wherein:
the driving chip performs level conversion according to the analog power voltage signal AVDD output by the power management unit, and generates a first voltage signal AVEE between the first voltage unit and a second voltage signal VGL (not shown in fig. 1) between the first voltage signal and the second voltage signal, the second voltage signal being used for driving the display panel;
the protection unit is used for acting according to the voltage difference of the first voltage signal and the second voltage signal so as to prevent the parasitic diode from being conducted.
In this embodiment, the driving IC level-converts the analog power voltage signal AVDD from the power management unit, first generates a first voltage signal AVEE for controlling the driving circuit of the display device, and outputs a second voltage signal VGL of a dc low level after the level conversion of the first voltage signal, so as to drive the display panel. In the driving process of the display device in the embodiment of the invention, due to the inherent structure of the circuit in the prior art, a parasitic diode exists between the first voltage signal and the second voltage signal, and when the parasitic diode is conducted, the problem of overlarge analog power supply voltage signal can occur, so that abnormal driving and display of the display panel are caused.
In a specific example, as shown in fig. 1, the protection unit is disposed outside the driver chip, for example, on the FPC flexible circuit board, in this example, the parasitic diode conduction between the first voltage signal and the second voltage signal can be avoided by the protection unit located outside the driver chip without changing the circuit structures of the driver chip and the display panel, and the structural design is simple and the cost is effectively controlled.
In an alternative embodiment, as shown in fig. 2, the protection unit is disposed in the driving chip. According to the embodiment of the invention, the protection unit is integrated in the driving chip, so that the installation space of the protection unit is further reduced on the basis of realizing the protection of the display device, the space utilization rate is improved, and the volume of the display device is effectively reduced.
It should be noted that, the setting position and the specific structure of the protection unit are not specifically limited in the present invention, and those skilled in the art should set the protection unit according to practical application requirements to implement that the protection unit performs an action according to the voltage difference between the first voltage signal and the second voltage signal to avoid the conduction of the parasitic diode between the first voltage signal and the second voltage signal as a design criterion, which is not described herein again.
In an alternative embodiment, as shown in fig. 3, the protection unit includes a comparator and a gating switch, where the comparator includes a first input terminal, a second input terminal, and an output terminal, where the first input terminal is connected to the first voltage signal, the second input terminal is connected to the second voltage signal, and the comparator compares a difference value between the first voltage signal AVEE and the second voltage signal VGL according to a preset voltage difference threshold and outputs a comparison result from the output terminal;
the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal VGL, the gating second input end is connected to a preset voltage signal, and the gating switch selectively outputs the second voltage signal or the preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
In the embodiment of the present invention, for example, the protection unit is located outside the driving chip, as shown in fig. 3, a first voltage signal is input through a first input end of a comparator, a second voltage signal is input through a second input end of the comparator, a difference is made between the first voltage signal and the second voltage signal in the comparator to obtain an actual voltage difference value, the actual voltage difference value is compared with a voltage difference threshold preset in the comparator, and a comparison result is output from an output end to the gate switch, so that the gate switch operates according to the comparison result.
In an optional embodiment, the comparator outputs a first comparison result in response to the second voltage signal being greater than the first voltage signal and the voltage difference therebetween being greater than the preset voltage difference threshold, and otherwise outputs a second comparison result. Furthermore, a gating enable input end of the gating switch receives the first comparison result or the second comparison result, the first gating input end is connected to the second voltage signal, the second gating input end is connected to the preset voltage signal, and the preset voltage signal or the second voltage signal is selectively output from the output end according to the corresponding comparison result.
The preset voltage threshold of the embodiment of the invention is a voltage difference threshold of the second voltage signal and the first voltage signal, which can prevent the parasitic diode from being conducted, for example, if the minimum conducting voltage of the parasitic diode is 0.3V, the preset voltage threshold may be 0.2V. In a specific example, taking the preset voltage threshold as 0.2V as an example, when the voltage value of the second voltage signal is 1.0V and the voltage value of the first voltage signal is 0.6V, the voltage value of the second voltage signal is greater than the voltage value of the first voltage signal, the actual voltage difference between the two voltage signals is 0.4V, and at this time, the actual voltage difference is 0.4V > the preset voltage difference threshold 0.2V, and at this time, the comparator performs a comparison and judgment according to the first voltage signal and the second voltage signal to output a first comparison result, so as to effectively control the conduction of the parasitic diode.
In an optional embodiment, the gate switch outputs the preset voltage signal to the display panel according to the input first comparison result to prevent the parasitic diode from being turned on. Specifically, after the comparator outputs the first comparison result for preventing the parasitic diode from being turned on, the gate switch outputs a low-level preset voltage signal according to the first comparison result, in a specific example, the voltage value of the second voltage signal is 1.0V, and the voltage value of the first voltage signal is 0.6V, and the gate switch outputs a low-level preset voltage signal to the driving panel according to the first comparison result, for example, 0.5V.
In another alternative embodiment, the gate switch outputs the second voltage signal VGL to the display panel to drive the display panel according to the input second comparison result. Specifically, if the first voltage signal and the second voltage signal are sequentially output according to the output timing sequence, the stable output that the first voltage signal is greater than the second voltage signal is maintained, and at this time, the comparator outputs the second comparison result according to the obtained determination result that the first voltage signal is greater than the second voltage signal. The gating switch outputs the second voltage signal to the display panel through the output end according to the second comparison result, so that the problem of overlarge analog power supply voltage signal is avoided, and normal driving and displaying of the display panel are effectively ensured.
In this embodiment, the comparator is used to compare the voltage values between the first voltage signal and the second voltage signal, monitor the state of the parasitic diode between the first voltage signal and the second voltage signal in real time, and perform driving protection on the display device through the gating switch. The gating switch outputs a low-level preset voltage signal as a second voltage signal to the display panel according to the comparison result, so that the first voltage signal is ensured to be always in a state of being larger than the second voltage signal in the driving process, the phenomenon that a parasitic diode is conducted due to the fact that the first voltage signal is smaller than the second voltage signal is avoided, the analog power supply voltage signal is effectively controlled, the driving stability of the display device is kept, and the wide application prospect is achieved.
As shown in fig. 3, the protection unit of the display device includes a comparator and a gating switch, wherein the comparator includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the first voltage signal, and the second input terminal is connected to the second voltage signal; the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal VGL, the gating second input end is connected to a preset voltage signal, and the process of displaying by using the display device comprises the following steps:
the power management unit outputs an analog power voltage signal AVDD to the driving chip.
And the driving chip performs level conversion according to the analog power supply voltage signal AVDD to generate a first voltage signal AVEE and a second voltage signal VGL for driving the display panel. The first voltage signal and the second voltage signal are output in response to the output timing. Parasitic diodes are present between the first voltage signal and the second voltage signal due to the inherent structure of the driving circuit.
The protection unit operates according to a voltage difference between the first voltage signal AVEE and the second voltage signal VGL to prevent the parasitic diode from being turned on, and the specific step further includes:
the comparator compares the difference value of the first voltage signal AVEE and the second voltage signal VGL according to a preset voltage difference threshold value and outputs the comparison result from the output end.
And the gating switch selectively outputs a second voltage signal or a preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
In one specific example, in response to the first voltage signal being less than the second voltage signal, the actual voltage difference between the two being greater than a preset voltage difference threshold, the comparator outputs a first comparison result. Furthermore, the gating switch outputs a low-level preset voltage signal according to the first comparison result, so that the problem of overlarge analog power supply voltage signal caused by the conduction of a parasitic diode between the first voltage signal and the second voltage signal can be avoided, and the normal driving and display of the display panel can be realized.
In another specific example, in response to the first voltage signal and the second voltage signal, the comparator compares a second comparison result that the first voltage signal is greater than the second voltage signal and outputs the second comparison result to the gate switch, so that the gate switch directly outputs the second voltage signal to the display panel according to the second comparison result, and a parasitic diode between the first voltage signal and the second voltage signal is not turned on, thereby achieving normal driving and display of the display panel.
In an alternative embodiment, as shown in fig. 4, the protection unit includes a protection diode, a turn-on voltage of the protection diode is smaller than a turn-on voltage of the parasitic diode, and the protection unit turns on the protection diode according to a voltage difference between the first voltage signal AVEE and the second voltage signal VGL to prevent the parasitic diode from turning on;
the protection diode comprises an anode and a cathode, the anode of the protection diode is electrically connected with the second voltage signal VGL, and the cathode of the protection diode is electrically connected with the first voltage signal AVEE.
Still take the example that the protection diode of the embodiment of the present invention is located outside the driving chip, for example, the protection diode is located on the flexible circuit board of the display panel. In the embodiment of the invention, the parasitic diode is connected in parallel with the protection diode, and the conduction voltage of the protection diode is smaller than that of the parasitic diode. The protection diode can respond to the voltage difference between the first voltage signal and the second voltage signal to be quickly conducted, so that the problem that the voltage signal of the analog power supply is overlarge due to the fact that the parasitic diode is conducted is avoided, and normal driving and displaying of the display panel are effectively guaranteed.
As shown in fig. 4, the anode of the protection diode is electrically connected to the second voltage signal VGL, and the cathode of the protection diode is electrically connected to the first voltage signal AVEE. In a specific example, the turn-on voltage of the protection diode is 0.2V, the turn-on voltage of the parasitic diode is 0.3V, and the protection diode can be turned on in response to the voltage difference between the first voltage signal and the second telecommunication signal, so that the turn-on of the parasitic diode is avoided, the problem of overlarge analog power supply voltage signal is solved, and the driving and display of the display panel are effectively protected.
It should be further noted that, in the embodiment of the present invention, the conduction voltage value of the parasitic diode, the preset voltage threshold, the second voltage signal voltage value, the first voltage signal voltage value, and the conduction voltage value of the protection diode are all exemplarily described, and the present invention is not particularly limited to this, and a person skilled in the art should be able to set corresponding voltage values according to actual applications and needs, and details thereof are not repeated herein.
In an alternative embodiment, the protection diode is a schottky diode. According to the embodiment of the invention, the Schottky diode is used as the protection diode, so that the cost can be effectively reduced, and the product competitiveness is improved.
As shown in fig. 4, the protection unit includes a protection diode, the turn-on voltage of the protection diode is smaller than the turn-on voltage of the parasitic diode, the protection diode includes an anode and a cathode, the anode of the protection diode is electrically connected to the second voltage signal, the cathode of the protection diode is electrically connected to the first voltage signal, and the process of displaying using the display device includes:
the power management unit outputs an analog power voltage signal AVDD to the driving chip.
And the driving chip performs level conversion according to the analog power supply voltage signal AVDD to generate a first voltage signal AVEE and a second voltage signal VGL for driving the display panel. The first voltage signal and the second voltage signal are output in response to the output timing. Parasitic diodes are present between the first voltage signal and the second voltage signal due to the inherent structure of the driving circuit.
The protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the protection unit conducts the protection diode according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from conducting. Specifically, when the voltage of the second voltage signal is greater than the voltage of the first voltage signal and the actual voltage difference is greater than the turn-on voltage of the protection diode, the turn-on voltage of the protection diode is preferentially turned on, so that the problem that the analog power supply voltage signal is too large due to the fact that the parasitic diode is turned on is solved.
It should be noted that the display device shown in fig. 1 to 4 according to the embodiment of the present invention may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator, and will not be described herein again.
Corresponding to the display device provided in the foregoing embodiment, an embodiment of the present application further provides a using method using the display device shown in fig. 5, including:
the power supply management unit outputs an analog power supply voltage signal to the driving chip;
the driving chip carries out level conversion according to the analog power supply voltage signal to generate a first voltage signal and a second voltage signal, a parasitic diode exists between the first voltage signal and the second voltage signal, and the second voltage signal is used for driving the display panel;
the protection unit acts according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from being conducted.
In the process of displaying by using the display device of the embodiment of the invention, the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode between the first voltage signal and the second voltage signal from being conducted, so that the problem of overlarge voltage of the analog power supply caused by the fact that the time sequence of the two voltage signals cannot be stably controlled in the prior art is solved, the display device is effectively protected from normal driving and displaying, and the display device has a wide application prospect.
In an optional embodiment, the protection unit includes a comparator and a gating switch, wherein the comparator includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the first voltage signal, and the second input terminal is connected to the second voltage signal; the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal, and the gating second input end is connected to a preset voltage signal; the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the comparator compares the difference value of the first voltage signal and the second voltage signal according to a preset voltage difference threshold value and outputs a comparison result from the output end;
and the gating switch selectively outputs a second voltage signal or a preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
In the process of displaying by using the display device provided by the embodiment of the invention, the comparator compares the voltage value between the first voltage signal and the second voltage signal, monitors the state of the parasitic diode between the first voltage signal and the second voltage signal in real time, carries out drive protection on the display device through the gating switch, and the gating switch outputs a low-level preset voltage signal or a second voltage signal to the display panel according to the comparison result, so that the first voltage signal is always in a state larger than the second voltage signal in the drive process, the phenomenon of conduction of the parasitic diode caused by the fact that the first voltage signal is smaller than the second voltage signal is avoided, the analog power supply voltage signal is effectively controlled, the drive stability of the display device is kept, and the display device has a wide application prospect.
In an optional embodiment, the protection unit includes a protection diode, a turn-on voltage of the protection diode is smaller than a turn-on voltage of the parasitic diode, the protection diode includes an anode and a cathode, the anode of the protection diode is electrically connected with the second voltage signal, and the cathode of the protection diode is electrically connected with the first voltage signal; the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the protection unit conducts the protection diode according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from conducting.
In the process of displaying by using the display device of the embodiment of the invention, the protection diode is quickly conducted in response to the voltage difference between the first voltage signal and the second voltage signal, so that the problem of overlarge analog power supply voltage signal caused by the conduction of the parasitic diode is avoided, and the normal driving and displaying of the display panel are effectively ensured.
Since the application method provided by the embodiments of the present application corresponds to the display device provided by the above-mentioned several embodiments, the previous embodiments are also applicable to the application method provided by the present embodiment, and detailed description is not provided in the present embodiment.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A display device, comprising a power management unit, a driving chip, a display panel and a protection unit, wherein:
the driving chip performs level conversion according to the analog power supply voltage signal output by the power supply management unit to generate a first voltage signal and a second voltage signal, a parasitic diode is arranged between the first voltage signal and the second voltage signal, and the second voltage signal is used for driving the display panel;
the protection unit is used for acting according to the voltage difference of the first voltage signal and the second voltage signal so as to prevent the parasitic diode from being conducted.
2. The display device according to claim 1, wherein the protection unit comprises a comparator and a gate switch, wherein
The comparator comprises a first input end, a second input end and an output end, wherein the first input end is connected with the first voltage signal, the second input end is connected with the second voltage signal, and the comparator compares the difference value of the first voltage signal and the second voltage signal according to a preset voltage difference threshold value and outputs the comparison result from the output end;
the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal, the gating second input end is connected to the preset voltage signal, and the gating switch selectively outputs the second voltage signal or the preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
3. The display device according to claim 2, wherein the comparator outputs a first comparison result when the second voltage signal is greater than the first voltage signal and a voltage difference therebetween is greater than the preset voltage difference threshold, and outputs a second comparison result otherwise.
4. The display device according to claim 3,
the gating switch outputs the preset voltage signal to the display panel according to an input first comparison result so as to prevent the parasitic diode from being conducted; or
The gate switch outputs the second voltage signal to the display panel according to an input second comparison result to drive the display panel.
5. The display device according to claim 1, wherein the protection unit includes a protection diode having a turn-on voltage smaller than a turn-on voltage of the parasitic diode, and the protection unit turns on the protection diode according to a voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from turning on;
the protection diode comprises an anode and a cathode, the anode of the protection diode is electrically connected with the second voltage signal, and the cathode of the protection diode is electrically connected with the first voltage signal.
6. The display device according to claim 5, wherein the protection diode is a schottky diode.
7. The display device according to any one of claims 1 to 6, wherein the protection unit is provided in the driver chip.
8. Use of a display device according to any of claims 1-7, comprising:
the power supply management unit outputs an analog power supply voltage signal to the driving chip;
the driving chip carries out level conversion according to the analog power supply voltage signal to generate a first voltage signal and a second voltage signal, a parasitic diode exists between the first voltage signal and the second voltage signal, and the second voltage signal is used for driving the display panel;
the protection unit acts according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from being conducted.
9. The use method according to claim 8, wherein the protection unit comprises a comparator and a gating switch, wherein the comparator comprises a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the first voltage signal, and the second input terminal is connected to the second voltage signal; the gating switch comprises a gating enabling input end, a gating first input end, a gating second input end and a gating output end, wherein the gating enabling input end is connected to the comparison result, the gating first input end is connected to the second voltage signal, and the gating second input end is connected to a preset voltage signal; the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the comparator compares the difference value of the first voltage signal and the second voltage signal according to a preset voltage difference threshold value and outputs a comparison result from the output end;
and the gating switch selectively outputs a second voltage signal or a preset voltage signal to the display panel according to the comparison result so as to prevent the parasitic diode from being conducted.
10. The use method according to claim 8, wherein the protection unit comprises a protection diode, the turn-on voltage of the protection diode is smaller than the turn-on voltage of the parasitic diode, the protection diode comprises an anode and a cathode, the anode of the protection diode is electrically connected with the second voltage signal, and the cathode of the protection diode is electrically connected with the first voltage signal; the protection unit acts according to the voltage difference between the first voltage signal and the second voltage signal to prevent the parasitic diode from being turned on further comprises:
the protection unit conducts the protection diode according to the voltage difference of the first voltage signal and the second voltage signal to prevent the parasitic diode from conducting.
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| CN113192450B (en) | 2023-10-31 |
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