A display panel, display device

Abstract

The application provides a display panel and a display device, the display panel is provided with a control module, a first end of the control module is connected with a ground of a power input end, and a second end of the control module is connected with a ground of a display module, the control module can make the ground of the power input end and the ground of the display module in a connected state or a disconnected state according to a current flowing through the display module, when a short circuit occurs in a circuit of the display module, a large current is generated on the display module, at this time, the control module controls the connection between the ground of the power input end and the ground of the display module to be disconnected, that is, the power supply of the display module by the power input end is disconnected, and the problem of circuit damage caused by the short circuit of the display module is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display, more particularly, to a display panel and a display device. BACKGROUND

[0002] The biggest feature of liquid crystal display (LCD) is thin, light, low power consumption and low operating voltage, etc., and at present, LCD display panel still occupies the main role in various existing flat panel display panels.

[0003] However, in the test or use of the existing LCD module, many kinds of short circuit phenomenon will occur, which will cause the damage of the LCD module, for example, the connector or FPC (Flexible Printed Circuit) insertion deviation will cause the short circuit and burn of the module, resulting in the scrapping of the module; or the improper assembly of the circuit and electronic components on the LCD module and the whole machine will cause the short circuit of the whole machine circuit due to interference, resulting in the damage of the module; or the improper contact of the circuit and electronic components on the LCD module and the conductor, such as contact with water, may also cause the circuit short circuit damage.

[0004] The existing short circuit problem caused by the insertion deviation of the connector and the FPC can be solved by physical isolation between high-voltage pins through a false pin, and some high-risk pins can be solved by increasing the protection circuit; but the physical isolation by setting a false pin is limited by the requirements of the application interface, and it is not necessarily realized, and the protection circuit added to the high-risk pins can only protect a part of the pins, and cannot protect all the pins; for the circuit short circuit damage problem caused by the improper assembly of the circuit and electronic components on the LCD module and the whole machine and the improper contact of the circuit and electronic components on the LCD module and the conductor, there is no solution at present. SUMMARY

[0005] Therefore, in order to solve the above problems, the present application provides a display panel and a display device, and the technical scheme is as follows:

[0006] A display panel, comprising:

[0007] A control module; a first end of the control module is connected with the ground of a power input end; a second end of the control module is connected with the ground of a display module;

[0008] The control module is used for making the ground of the power input end and the ground of the display module in a connected state or a disconnected state according to the current flowing through the display module.

[0009] A display device, comprising the display panel according to any one of the above.

[0010] Compared with the prior art, the present application has the following beneficial effects:

[0011] The present application provides a display panel, which is provided with a control module, a first end of the control module is connected with the ground of a power input end, and a second end of the control module is connected with the ground of a display module, the control module can make the ground of the power input end and the ground of the display module in a connected state or a disconnected state according to the current flowing through the display module, for example, when the display module normally works, the current of the display module is in a normal range, the control module controls the ground of the power input end and the ground of the display module to be in a connected state; when a short circuit occurs in the circuit of the display module, the display module generates a large current, the control module controls the connection between the ground of the power input end and the ground of the display module to be disconnected, that is, the power supply of the display module by the power input end is disconnected, thereby avoiding the circuit damage problem caused by the short circuit of the display module. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0013] Figure 1 A structural schematic diagram of a display panel provided by the present application is shown in the figure.

[0014] Figure 2 A structural schematic diagram of another display panel provided by the present application is shown in the figure.

[0015] Figure 3 A structural schematic diagram of another display panel provided by the present application is shown in the figure.

[0016] Figure 4 A characteristic curve diagram of a depletion mode P-channel field effect transistor provided by the present application is shown in the figure.

[0017] Figure 5 A parameter diagram of a depletion mode P-channel field effect transistor provided by the present application is shown in the figure.

[0018] Figure 6 A parameter diagram of a magnetic bead provided by the present application is shown in the figure.

[0019] Figure 7 A structural schematic diagram of another display panel provided by the present application is shown in the figure.

[0020] Figure 8 A structural schematic diagram of another display panel provided by the present application is shown in the figure.

[0021] Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention; the display panel includes:

[0025] Control module 01; the first terminal 01a of the control module 01 is connected to ground GND1 of the power input terminal 02; the second terminal 01b of the control module 02 is connected to ground GND2 of the display module 03.

[0026] The control module 01 is used to connect or disconnect the ground GND1 of the power input terminal 02 and the ground GND2 of the display module 03 according to the current flowing through the display module 03.

[0027] Specifically, in the display panel, such as Figure 1 As shown, the ground GND1 of the power input terminal 02 is connected to the first terminal 01a of the control module 01, and the second terminal 01b of the control module 01 is connected to the ground GND2 of the display module 03. At this time, the ground GND1 of the power input terminal 02 and the ground GND2 of the display module 03 are connected. The power input terminal 02 outputs voltage, which can provide power to the display module 03, thereby enabling the display module 03 to work and further enabling the display panel to work normally.

[0028] It should be noted that when the power input end 02 outputs voltage to supply the display module 03, the display module works normally, and the current of the display module is in a normal range, at this time, the ground GND1 of the power input end 02 and the ground GND2 of the display module 03 are in a connected state through the control module 01; when a short circuit occurs in the display module 03, the current flowing through the ground GND2 of the display module 03 becomes large, the control module 01 controls the ground GND1 of the power input end 02 to be disconnected with the ground GND2 of the display module 03, at this time, the display module 03 has no power input, thereby avoiding damage to the circuit of the display module 03.

[0029] Optionally, in another embodiment of the present application, referring to Figure 2 , Figure 2 Another structural schematic diagram of a display panel provided by the embodiment of the present application; the control module 01 comprises a switching unit 04 and a voltage dividing unit 05.

[0030] The first end 04a of the switching unit 04 is connected with the ground GND1 of the power input end 02, and the second end 04b of the switching unit 04 is connected with the first end 05a of the voltage dividing unit 05.

[0031] The second end 05b of the voltage dividing unit 05 is connected with the ground GND2 of the display module 03 and the control end 04c of the switching unit 04 respectively.

[0032] The switching unit 04 is in a conducting state or an off state based on the voltage between the voltage dividing unit 05.

[0033] Specifically, as shown in Figure 2 The ground GND1 of the power input end 02 is connected with the first end 04a of the switching unit 04 in the control module 01, the second end 04b of the switching unit 04 is connected with the first end 05a of the voltage dividing unit 05, the second end 04b of the voltage dividing unit 05 is connected with the ground GND2 of the display module 03, and is connected with the control end 04c of the switching unit 04, at this time, the power input end 02 outputs voltage to supply the display module 03, the control end 04c of the switching unit 04 can control the conducting and off of the switching unit, when the voltage drop between the first end 05a and the second end 05b of the voltage dividing unit 05 is in a normal range, the switching unit 04 is in a conducting state, when the voltage drop between the first end 05a and the second end 05b of the voltage dividing unit 05 is not in a normal range, the switching unit 04 is in an off state, for example, when a short circuit occurs in the display module 03, the current of the display module 03 becomes large, the current flowing through the voltage dividing unit 05 is also large, at this time, there is a large voltage drop on the voltage dividing unit 05, so that there is a large voltage difference between the second end 04b and the control end 04c of the switching unit 04, thereby making the state of the switching unit 04 change from conducting to off.

[0034] The switching unit 04 in the control module 01 can control the working state of the switching unit 04 based on the voltage across the voltage divider unit 05, thereby controlling the connection state between the power input terminal 02 and the display module 03, reducing the probability of damage to the display module 03.

[0035] Optionally, in another embodiment of the invention, reference is made to... Figure 3 , Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present invention; the switching unit 04 includes a P-type field-effect transistor 04A.

[0036] The voltage divider unit 05 includes a resistor 05A.

[0037] The first terminal 04A1 of the P-type field-effect transistor 04A is connected to ground GND1 of the power input terminal 02; the second terminal 04A2 of the P-type field-effect transistor 04A is connected to the first terminal 05A1 of the resistor 05A; the second terminal 05A2 of the resistor 05A is connected to ground GND2 of the display module 03 and gate terminal 04A3 of the P-type field-effect transistor 05A.

[0038] Specifically, such as Figure 3 As shown, the first terminal 04A1 of the P-type field-effect transistor 04A is the drain, and the second terminal 04A2 is the source. The drain is represented by D, the source by S, and the gate terminal 04A3 by G. The voltage divider unit 05 includes, but is not limited to, the resistor 05A, which is only an example.

[0039] It should be noted that resistor 05A is a current sampling resistor with a small resistance value. In other words, resistor 05A samples the current by dividing the voltage.

[0040] Optionally, in another embodiment of the present invention, the P-type field-effect transistor 05A is a depletion-type P-channel field-effect transistor.

[0041] It should be noted that depletion-mode P-channel field-effect transistors can be used as switches; see reference. Figure 4 , Figure 4 A schematic diagram of the characteristic curves of a depletion-type P-channel field-effect transistor provided for an embodiment of the present invention; Figure 4 In the diagram, I D V is the drain current. GS V is the voltage between the source (S) and the gate (G). GS(off) The pinch-off voltage is the voltage V between the source S and the gate G. GS <V GS(off) At that time, a drain current I always exists in the depletion-type P-channel field-effect transistor. DThat is, the depletion mode P-channel field effect transistor is in the on state when the voltage V GS > V GS(off) , the depletion mode P-channel field effect transistor does not have a drain current I D , at which time the depletion mode P-channel field effect transistor is in the off state.

[0042] For example, when the voltage generated by the power input end 02 is input from the drain D of the depletion mode P-channel field effect transistor, a drain current I D is generated at this time, V GS < V GS(off) , the depletion mode P-channel field effect transistor is in the on state, the ground GND1 of the power input end 02 is connected to the ground GND2 of the display module 03, and the display module 03 normally displays; when the display module 03 has a short circuit condition, the display module 03 will generate a large current, causing a large voltage drop across the resistor 05A, thereby causing V GS > V GS(off) , so that the depletion mode P-channel field effect transistor is in the off state.

[0043] In actual use, the short circuit conditions of three groups of display modules 03 are detected, for example, when the first group of display modules 03 has a short circuit, the actual detection voltage of the display module 03 is 12V, and the short circuit current is 21A; when the second group of display modules 03 has a short circuit, the actual detection voltage of the clock signal line (SCL) or other signal line in the display module 03 is 12V, and the short circuit current is 15A; when the third group of display modules 03 has a short circuit, the actual detection voltage of the display module 03 is 3.3V, and the short circuit current is 3A, etc.

[0044] According to the above characteristics, the depletion mode P-channel field effect transistor can control its on state or off state based on the voltage drop across the resistor 05A, thereby directly controlling the connection state of the power input end 02 and the display module 03, and solving the problem of damage to the display module 03 caused by the short circuit of the display module 03.

[0045] Optionally, in another embodiment of the present application, the resistance of the depletion mode P-channel field effect transistor is less than 1 ohm.

[0046] It should be noted that in order to reduce the voltage difference between the power input end 02 and the display module 03, the resistance of the control module 01 needs to be set small, and the resistance of the depletion mode P-channel field effect transistor 04A can be set to less than 1 ohm, for example, 26 milliohms, 13 milliohms, 8.5 milliohms, etc., and the resistance of the resistor 05A can be set small, wherein the resistance of the resistor 05A is not fixed and can be set according to the pinch-off voltage V GS(off) of the depletion mode P-channel field effect transistor.

[0047] refer to Figure 5 , Figure 5 This is a schematic diagram of the parameters of a depletion-type P-channel field-effect transistor provided in an embodiment of the present invention; as shown. Figure 5 The pinch-off voltage V of the depletion-type P-channel field-effect transistor (LP8217DT1AG) shown in the figure. GS(off) The minimum value is set to 0.4V, and the on-resistance R DSon The maximum value is set to 26 milliohms; the short-circuit current I is... 短路 The current is 3A. The maximum value of resistor 05A (R1) can be 0.4V / 3A = 133 milliohms. Under normal operation, it is equivalent to the on-resistance R between the power input terminal 02 and the display module 03. DSon The sum of the resistor R1 and the voltage R is 159 milliohms; the pinch-off voltage V of the depletion-type P-channel field-effect transistor (LP8207DT1AG) is... GS(off) The minimum value is set to 0.5V, and the on-resistance R is... DSon The maximum value is set to 6.8 milliohms; the short-circuit current I is... 短路 The current is 3A. The maximum value of resistor 05A (R2) can be 0.5V / 3A = 166 milliohms. Under normal operation, it is equivalent to the on-resistance R between the power input terminal 02 and the display module 03. DSon The sum of the resistor R2 and the voltage R2 is 172.8 milliohms; the pinch-off voltage V of the depletion-mode P-channel field-effect transistor (LP8233DT1AG). GS(off) The minimum value is set to 0.5V, and the on-resistance R is... DSon The maximum value is set to 8.5 milliohms; the short-circuit current I is... 短路 The current is 3A. The maximum value of resistor 05A (R3) can be 0.5V / 3A = 166 milliohms. Under normal operation, it is equivalent to the on-resistance R between the power input terminal 02 and the display module 03. DSon The sum of the voltages with resistor R3 is 174.5 milliohms; the pinch-off voltage V of the depletion-mode P-channel field-effect transistor (LP8104DT1AG). GS(off) The minimum value is set to 1V, and the on-resistance is R. DSon The maximum value is set to 13 milliohms; the short-circuit current I is... 短路 The current is 3A. The maximum value of resistor 05A (R4) can be 1V / 3A = 333 milliohms. Under normal operation, it is equivalent to the on-resistance R between the power input terminal 02 and the display module 03. DSon The sum of the resistance R4 and the total resistance is 346 milliohms.

[0048] Since ferrite beads are often connected in series at the grounding point in conventional designs, and the normal on-resistance of the ferrite bead is around 100 milliohms, for reference... Figure 6 , Figure 6A schematic diagram of parameters of magnetic beads provided in an embodiment of the present application is shown in the following table:

[0049] Figure 6 The resistance (Max. DC resistance) of the magnetic bead (UPZ1608G300-1R8TF) is 60 mΩ, the resistance (Max. DC resistance) of the magnetic bead (UPZ1608G600-1R2TF) is 100 mΩ, the resistance (Max. DC resistance) of the magnetic bead (UPZ1608G101-1R0TF) is 150 mΩ, and the resistance of the control module 01 is of the same order of magnitude; and the applicant usually connects the power input end 02 and the display module 03 with a Du binding wire during verification testing, and the resistance of the Du binding wire is usually about 500 mΩ-1000 mΩ, and the display module 03 can also be used normally, so it can be known that the resistance 05A of the control module 01 in the present application will not affect the pressure difference between the power input end 02 and the display module 03.

[0050] The resistance values of the depletion mode P-channel field effect transistor and the resistance 05A in the control module 01 are set to be small, so that the influence of the pressure drop at the control module 01 on the power input end 02 and the display module 03 can be reduced.

[0051] Optionally, in another embodiment of the present application, referring to Figure 7 , Figure 7 A structure schematic diagram of another display panel provided in an embodiment of the present application is shown in the following table; the display module 03 includes an LCD module.

[0052] Specifically, in the display panel, the display module 03 can be an LCD module 06, when a short circuit occurs in the LCD module 06, the control module 01 in the present application can disconnect the connection between the power input end 02 and the LCD module 06, so as to protect the LCD module 06 from being damaged.

[0053] It should be noted that the display module 03 is not specifically limited, and the LCD module 06 is only an example.

[0054] Optionally, in another embodiment of the present application, the LCD module 06 and the control module 01 are integrally arranged.

[0055] Specifically, the LCD module 06 includes a printed circuit board (PCB), a panel, etc., and the control module 01 can be located on the LCD module 06, for example, arranged on the printed circuit board, or arranged on a flexible printed circuit (FPC), etc., and the integrally arranged LCD module 06 and control module 01 can simplify the circuit structure and optimize the layout space.

[0056] Optionally, in another embodiment of the present application, referring to Figure 8 , Figure 8 A structural schematic diagram of another display panel provided by an embodiment of the present application is shown in the figure. The display panel further comprises a driving mainboard 07, which is used to control the working state of the display panel.

[0057] The driving mainboard 07 comprises the power input end 02.

[0058] Specifically, the power input end 02 is located on the driving mainboard 07, and the power input end 02 is used to provide power for the display panel, so that the driving mainboard 07 can control the working state of the display panel. For example, when the power input end 02 on the driving mainboard 07 supplies power, the display panel displays; when the power input end 02 on the driving mainboard 07 does not output voltage, the display panel does not display.

[0059] Optionally, in another embodiment of the present application, the driving mainboard 07 is integrally arranged with the control module 01.

[0060] Specifically, the control module 01 can be located on the driving mainboard 07, and integrally arranging the driving mainboard 07 with the control module 01 can simplify the circuit structure and optimize the layout space.

[0061] It should be noted that the position of the control module 01 is not specifically limited and is arranged according to specific needs.

[0062] A display device, referring to Figure 9 , Figure 9 A structural schematic diagram of a display device provided by an embodiment of the present application is shown in the figure. The display device 100 comprises the display panel described in the above embodiments.

[0063] Specifically, the display device 100 comprises but is not limited to electronic devices such as tablets and mobile phones, and the display device has the same features as the display panel provided by the above embodiments of the present application.

[0064] The above provides a detailed description of a display panel and a display device provided by the present application. In this paper, specific examples are applied to describe the principles and implementation modes of the present application. The above embodiment is only used to help understand the method and core idea of the present application; at the same time, for the general technical personnel in the art, according to the idea of the present application, the specific implementation mode and application range will be changed; according to the above, the content of the specification should not be understood as the limitation of the present application.

[0065] It should be noted that each of the embodiments described in this specification has a corresponding form that is directed to the execution of commands by a computer system. However, the embodiments disclosed herein are not limited to these corresponding forms, but include both the devices and the processes disclosed herein.

[0066] It should also be noted that the herein disclosed embodiments are not limited to the details of the foregoing description, since the scope of the embodiments is defined by the claims. Furthermore, it should be noted that the term "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The term "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. It is further noted that the description uses the term "comprising" or "comprises" to mean that the elements listed following the term are included, but not to exclude the presence of other elements or steps. Thus, the term "comprising" should be interpreted as including the presence of one or more elements or steps that follow the term in the claims.

[0067] The above description just illustrates the specific embodiments of the present application. Various modifications to these embodiments can be made by those skilled in the art without departing from the spirit or scope of the present application. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized by, The display panel comprises: a control module; a first end of the control module is connected with the ground of the power input end; a second end of the control module is connected with the ground of the display module; the control module is used for making the ground of the power input end and the ground of the display module in a connected state or a disconnected state according to the current flowing through the display module; the control module comprises a switch unit and a voltage division unit; a first end of the switch unit is connected with the ground of the power input end, and a second end of the switch unit is connected with a first end of the voltage division unit; a second end of the voltage division unit is respectively connected with the ground of the display module and a control end of the switch unit; the switch unit is in a conducting state or an off state based on the voltage across the voltage division unit.

2. The display panel of claim 1, wherein, The switch unit comprises a P-type field effect transistor. The voltage division unit comprises a resistor. A first pole of the P-type field effect transistor is connected with the ground of the power input end; a second pole of the P-type field effect transistor is connected with a first end of the resistor; and a second end of the resistor is respectively connected with the ground of the display module and a gate end of the P-type field effect transistor.

3. The display panel of claim 2, wherein, The P-type field effect transistor is a depletion-mode P-channel field effect transistor.

4. The display panel of claim 3, wherein, The resistance of the depletion-mode P-channel field effect transistor is less than 1 ohm.

5. The display panel of claim 1, wherein, The display module comprises an LCD module.

6. The display panel of claim 5, wherein, The LCD module is integrally arranged with the control module.

7. The display panel of claim 1, wherein, The display panel further comprises a drive mainboard used for controlling the working state of the display panel. The drive mainboard comprises the power input end.

8. The display panel of claim 7, wherein, The drive mainboard is integrally arranged with the control module.

9. A display device comprising: The display device comprises the display panel of claims 1-8.

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