CN112687221B - Display module and display device - Google Patents
Display module and display device Download PDFInfo
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- CN112687221B CN112687221B CN202011547799.8A CN202011547799A CN112687221B CN 112687221 B CN112687221 B CN 112687221B CN 202011547799 A CN202011547799 A CN 202011547799A CN 112687221 B CN112687221 B CN 112687221B
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Abstract
The invention provides a display module and a display device, wherein the display module comprises a display panel, a driving chip and a power supply chip, when the display panel works in a first state, a driving voltage output end of the driving chip stops outputting fixed voltage, a power supply voltage output end of the power supply chip outputs the fixed voltage to a voltage input end of the display panel, and a conduction control circuit controls the driving voltage output end to be disconnected with the power supply voltage output end and the voltage input end respectively. When the display panel works in the second state, the power supply voltage output end stops outputting the fixed voltage, the conduction control circuit controls the conduction between the driving voltage output end and the power supply voltage output end and between the driving voltage output end and the voltage input end, and the driving voltage output end outputs the fixed voltage to the voltage input end. When the display panel works in the first state and the fixed voltage output by the power supply voltage output end of the power supply chip is abnormal, the situation that the abnormal fixed voltage damages the driving chip is avoided, and the reliability of the display device is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display module and a display device.
Background
The display device is widely applied to the fields of mobile phones, wearable equipment, electronic readers and the like, and along with the expansion of application fields and markets, the reliability requirement on the display device is also higher and higher. The display panel of the existing display device is generally provided with a voltage signal by a driving chip and a power chip together. However, when the power chip is affected by the external environment to generate an abnormality, the voltage signal output by the power chip is often reversely poured into the driving chip, so that the driving chip is damaged.
Disclosure of Invention
In view of this, the invention provides a display module and a display device, which effectively solve the technical problems existing in the prior art, eliminate the situation that the output voltage of a power chip is reversely poured into a driving chip, and improve the reliability of the display device.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a display module, comprising: a display panel, a driving chip and a power chip;
the display panel comprises a voltage input end for inputting a fixed voltage, the driving chip comprises a driving voltage output end for outputting the fixed voltage, and the power supply chip comprises a power supply voltage output end for outputting the fixed voltage;
the power supply voltage output end is electrically connected with the voltage input end, the driving voltage output end is electrically connected with a first end of a conduction control circuit, the power supply voltage output end and the voltage input end are electrically connected with a second end of the conduction control circuit, and the conduction control circuit is used for controlling the conduction or disconnection between the driving voltage output end and the power supply voltage output end and between the driving voltage output end and the voltage input end;
when the display panel works in a first state, the driving voltage output end stops outputting the fixed voltage, the power voltage output end outputs the fixed voltage to the voltage input end, and the conduction control circuit controls the driving voltage output end to be disconnected with the power voltage output end and the voltage input end respectively;
when the display panel works in the second state, the power supply voltage output end stops outputting the fixed voltage, the conduction control circuit controls the driving voltage output end to conduct between the power supply voltage output end and the voltage input end, and the driving voltage output end outputs the fixed voltage to the voltage input end.
Correspondingly, the invention further provides a display device, which comprises the display module.
Compared with the prior art, the technical scheme provided by the invention has at least the following advantages:
the invention provides a display module and a display device, wherein the display module comprises a display panel, a driving chip and a power supply chip, when the display panel works in a first state, a driving voltage output end of the driving chip stops outputting fixed voltage, a power supply voltage output end of the power supply chip outputs the fixed voltage to a voltage input end of the display panel, and a conduction control circuit controls the driving voltage output end to be disconnected with the power supply voltage output end and the voltage input end respectively. And when the display panel works in the second state, the power supply voltage output end stops outputting the fixed voltage, the conduction control circuit controls the conduction between the driving voltage output end and the power supply voltage output end and between the driving voltage output end and the voltage input end, and the driving voltage output end outputs the fixed voltage to the voltage input end.
Therefore, on the basis of ensuring that the display panel works normally in the first state and the second state, when the display panel works in the first state and the fixed voltage output by the power supply voltage output end of the power supply chip is abnormal, the drive voltage output end is controlled to be disconnected from the power supply voltage output end and the voltage input end by the on control circuit, so that abnormal fixed voltage is prevented from being transmitted to the drive voltage output end of the drive chip, the damage of the abnormal fixed voltage to the drive chip is avoided, and the reliability of the display device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of another display module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 9 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of another display module according to an embodiment of the invention;
fig. 12 is a schematic structural diagram of another display module according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As described in the background art, the display device is widely applied to fields such as mobile phones, wearable devices, electronic readers, etc., and along with expansion of application fields and markets, the reliability requirements on the display device itself are also increasing. The display panel of the existing display device is generally provided with a voltage signal by a driving chip and a power chip together. However, when the power chip is affected by the external environment to generate an abnormality, the voltage signal output by the power chip is often reversely poured into the driving chip, so that the driving chip is damaged.
In view of this, the embodiment of the invention provides a display module and a display device, which effectively solve the technical problems existing in the prior art, eliminate the situation that the output voltage of a power chip is reversely poured into a driving chip, and improve the reliability of the display device.
In order to achieve the above objective, the technical solutions provided by the embodiments of the present invention are described in detail below with reference to fig. 1 to 13.
Referring to fig. 1, a schematic structural diagram of a display module according to an embodiment of the present invention is shown, where the display module includes: a display panel 100, a driving chip 200, and a power chip 300.
The display panel 100 includes a voltage input terminal 101 inputting a fixed voltage, the driving chip 200 includes a driving voltage output terminal 201 outputting the fixed voltage, and the power chip 300 includes a power voltage output terminal 301 outputting the fixed voltage.
The power supply voltage output terminal 301 is electrically connected to the voltage input terminal 101, the driving voltage output terminal 201 is electrically connected to a first terminal of the conduction control circuit 400, the power supply voltage output terminal 301 and the voltage input terminal 101 are electrically connected to a second terminal of the conduction control circuit 400, and the conduction control circuit 400 is used for controlling conduction or disconnection between the driving voltage output terminal 201 and the power supply voltage output terminal 301 and between the driving voltage output terminal 201 and the voltage input terminal 101.
When the display panel 100 is in the first state, the driving voltage output terminal 201 stops outputting the fixed voltage, the power voltage output terminal 301 outputs the fixed voltage to the voltage input terminal 101, and the on control circuit 400 controls the driving voltage output terminal 201 to be disconnected from the power voltage output terminal 301 and the voltage input terminal 101, respectively.
When the display panel 100 works in the second state, the power supply voltage output terminal 301 stops outputting the fixed voltage, the conduction control circuit 400 controls the driving voltage output terminal 201 to conduct between the power supply voltage output terminal 301 and the voltage input terminal 101, and the driving voltage output terminal 201 outputs the fixed voltage to the voltage input terminal 101.
In an embodiment of the present invention, the first state of the display panel provided by the present invention may be a normal display state, and the second state of the display panel may be a low power consumption state. Because the power consumption of the normal display state of the display panel is higher than that of the low-power consumption display state, when the display panel works in the normal display state, a power chip is used for providing fixed voltage for the display panel so as to ensure the normal display requirement of the display panel; and when the display panel works in a low-power-consumption display state, the driving chip provides fixed voltage for the display panel, so that the overall power consumption of the display device is reduced on the basis of ensuring the low-power-consumption display of the display panel.
It can be appreciated that in the technical scheme provided by the embodiment of the invention, when the display panel works in the first state, the driving voltage output end of the driving chip stops outputting the fixed voltage, the power voltage output end of the power chip outputs the fixed voltage to the voltage input end of the display panel, and the on control circuit controls the disconnection between the driving voltage output end and the power voltage output end and the voltage input end respectively. And when the display panel works in the second state, the power supply voltage output end stops outputting the fixed voltage, the conduction control circuit controls the conduction between the driving voltage output end and the power supply voltage output end and between the driving voltage output end and the voltage input end, and the driving voltage output end outputs the fixed voltage to the voltage input end.
Therefore, on the basis of ensuring that the display panel works normally in the first state and the second state, when the display panel works in the first state and the fixed voltage output by the power supply voltage output end of the power supply chip is abnormal, the drive voltage output end is controlled to be disconnected from the power supply voltage output end and the voltage input end by the on control circuit, so that abnormal fixed voltage is prevented from being transmitted to the drive voltage output end of the drive chip, the damage of the abnormal fixed voltage to the drive chip is avoided, and the reliability of the display device is improved.
In an embodiment of the present invention, the fixed voltage provided by the present invention may be PVDD or PVEE. It should be noted that, the display panel provided by the present invention includes a plurality of sub-pixels, each sub-pixel includes a pixel circuit, where the pixel circuit is matched with the power supply voltage, the cathode voltage, the reference voltage, the clock control voltage signal, etc. to realize the on-off control of the light emitting device electrically connected with the pixel circuit, and the working process of the pixel circuit is the same as that of the prior art, so that the present invention does not redundant description. The PVDD provided by the invention is the power supply voltage provided by the pixel circuit, and PVEE is the cathode voltage provided by the pixel circuit.
The conduction control circuit provided by the embodiment of the invention is used for controlling the conduction or disconnection of the driving voltage output end, the power supply voltage output end and the voltage input end. In addition, when the display panel provided by the embodiment of the invention works in the first state and the second state, the driving voltage output end, the power voltage output end and the voltage input end work, so that the conduction control circuit provided by the embodiment of the invention is used for controlling the conduction from the driving voltage output end to the power voltage output end and the voltage input end in the second state and controlling the disconnection from the power voltage output end and the voltage input end to the driving voltage output end in the first state, wherein the specific structure of the conduction control circuit is not limited. As shown in fig. 2, a schematic structural diagram of another display module according to an embodiment of the present invention is provided, wherein the on control circuit 400 according to an embodiment of the present invention may include a diode 401 connected in series between the driving voltage output terminal 201 and the power voltage output terminal 301 and the voltage input terminal 101.
It can be appreciated that, the diode provided in the embodiment of the invention is connected in series between the driving voltage output end and the power voltage output end and the voltage input end, one end of the diode is connected with the driving voltage output end, and the other end of the diode is connected with the power voltage output end and the voltage input end, so that the purposes of controlling the disconnection from the power voltage output end and the voltage input end to the direction of the driving voltage output end in the first state and controlling the conduction from the driving voltage output end to the direction of the power voltage output end and the voltage input end in the second state are achieved through the unidirectional conduction performance of the diode, and the situation that the abnormal fixed voltage output by the power voltage output end is reversely irrigated to the driving voltage output end can be avoided while the display panel can realize the work in the first state and the second state.
In an embodiment of the present invention, the fixed voltage provided by the present invention may be a positive voltage or a negative voltage. When the function of the conduction control circuit is realized by the diode, the connection relationship between the diode and the driving voltage output terminal, the power supply voltage output terminal and the voltage input terminal is different under the condition that the fixed voltage is a positive voltage or a negative voltage. As shown in fig. 3, a schematic structural diagram of another display module according to an embodiment of the present invention is provided, wherein the on control circuit 400 provided by the embodiment of the present invention may include a diode 4011 connected in series between the driving voltage output terminal 201 and the power voltage output terminal 301 and the voltage input terminal 101. The fixed voltage provided by the embodiment of the present invention may be a negative voltage, the anode of the diode 4011 is electrically connected to the power supply voltage output terminal 301 and the voltage input terminal 101, and the cathode of the diode 4011 is electrically connected to the driving voltage output terminal 201.
It can be appreciated that, since the diode has the characteristics of being turned on when the voltage at the anode is greater than the voltage at the cathode and turned off when the voltage at the anode is less than the voltage at the cathode, the anode of the diode is electrically connected to the power supply voltage output terminal and the voltage input terminal, and the cathode of the diode is electrically connected to the driving voltage output terminal when the fixed voltage provided by the embodiment of the invention is a negative voltage. When the display panel works in the first state, the power supply voltage output end outputs negative voltage, and the driving voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that the negative voltage connected at the anode of the diode is smaller than the zero voltage connected at the cathode of the diode, and the purpose of disconnecting the power supply voltage output end and the voltage input end from the driving voltage output end is achieved. Meanwhile, when the negative voltage output by the power supply voltage output end is abnormal, the power supply voltage output end and the voltage input end are disconnected from the driving voltage output end, so that the situation that the driving chip is damaged due to the fact that abnormal negative voltage is poured into the driving voltage output end is avoided. When the display panel works in the second state, the driving voltage output end outputs negative voltage, and the power voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that zero voltage connected to the anode of the diode is larger than negative voltage connected to the cathode of the diode, and the purpose of conducting the driving voltage output end to the power voltage output end and the voltage input end in the direction is achieved.
As shown in fig. 4, a schematic structural diagram of another display module according to an embodiment of the present invention is provided, wherein the on control circuit 400 according to an embodiment of the present invention may include a diode 4012 connected in series between the driving voltage output terminal 201 and the power voltage output terminal 301 and the voltage input terminal 101. The fixed voltage provided in the embodiment of the present invention is a positive voltage, the cathode of the diode 4012 is electrically connected to the power supply voltage output terminal 301 and the voltage input terminal 101, and the anode of the diode 4012 is electrically connected to the driving voltage output terminal 201.
It can be appreciated that, since the diode has the characteristics of being turned on when the voltage at its anode is greater than the voltage at its cathode and turned off when the voltage at its anode is less than the voltage at its cathode, the embodiment of the invention provides a fixed voltage that electrically connects the cathode of the diode with the power supply voltage output terminal and the voltage input terminal and electrically connects the anode of the diode with the driving voltage output terminal when the fixed voltage is a positive voltage. When the display panel works in the first state, the power supply voltage output end outputs positive voltage, and the driving voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that zero voltage connected to the anode of the diode is smaller than positive voltage connected to the cathode of the diode, and the purpose of disconnecting the power supply voltage output end and the voltage input end from the driving voltage output end is achieved. Meanwhile, when the negative voltage output by the power supply voltage output end is abnormal, the power supply voltage output end and the voltage input end are disconnected from the driving voltage output end, so that the situation that the driving chip is damaged due to the fact that abnormal negative voltage is poured into the driving voltage output end is avoided. And when the display panel works in the second state, the driving voltage output end outputs positive voltage, and the power supply voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that the positive voltage connected at the anode of the diode is larger than the zero voltage connected at the cathode of the diode, and the purpose of conducting the driving voltage output end to the power supply voltage output end and the voltage input end in the direction is realized.
In any of the above embodiments of the present invention, the diode provided by the present invention is a schottky diode, so as to reduce the power consumption of the on control circuit and improve the reaction speed of the on control circuit. The specific type of the diode is not particularly limited in the invention, and in other embodiments of the invention, the diode can be of other types, and the specific selection is required according to practical application.
The conduction control circuit provided by the embodiment of the invention can also be realized through a switch tube. As shown in fig. 5, a schematic structural diagram of another display module provided by the embodiment of the present invention is shown, the turn-on control circuit provided by the embodiment of the present invention includes a switching tube 402, a gate and a drain of the switching tube 402 are connected to form a first end, and a source of the switching tube 402 is a second end, wherein the first end of the switching tube 402 and the second end of the switching tube 402 are connected in series between the driving voltage output terminal 201 and the power voltage output terminal 301 and the voltage input terminal 101.
It can be understood that when the display panel provided by the embodiment of the invention works in the first state, the purpose of controlling the power supply voltage output end and the disconnection from the voltage input end to the direction of the driving voltage output end is realized through the turn-off of the switching tube, so that the situation that the abnormal fixed voltage output by the power supply voltage output end is reversely irrigated to the driving voltage output end is avoided; and when the display panel works in the second state, the aim of controlling the conduction from the driving voltage output end to the power voltage output end and the voltage input end is fulfilled by the conduction of the switching tube.
In an embodiment of the present invention, the fixed voltage provided by the present invention may be a positive voltage or a negative voltage; the switching tube can be an N-type switching tube or a P-type switching tube, and the fixed voltage and the conduction type of the switching tube are different, so that the connection relationship between the switching tube and the driving voltage output end, the connection relationship between the power supply voltage output end and the connection relationship between the switching tube and the voltage input end are different. Referring to fig. 6, a schematic structural diagram of another display module provided by an embodiment of the present invention is shown, where the turn-on control circuit provided by the embodiment of the present invention includes a switching tube 4021, a gate and a drain of the switching tube 4021 are connected to form a first end, and a source of the switching tube 4021 is a second end; in the embodiment of the present invention, when the fixed voltage is a negative voltage and the switching tube is a P-type switching tube, the first end of the switching tube 4021 is electrically connected to the driving voltage output terminal 201, and the second end of the switching tube 4021 is electrically connected to the power voltage output terminal 301 and the voltage input terminal 101.
It can be understood that when the fixed voltage provided by the embodiment of the invention is a negative voltage and the switching tube is a P-type switching tube, the power supply voltage output end outputs a negative voltage and the driving voltage output end stops outputting the fixed voltage and is equivalent to zero voltage when the display panel works in the first state, so that the P-type switching tube is in an off state, and the purpose of disconnecting the power supply voltage output end and the voltage input end from the driving voltage output end is realized. Meanwhile, when the negative voltage output by the power supply voltage output end is abnormal, the power supply voltage output end and the voltage input end are disconnected from the driving voltage output end, so that the situation that the driving chip is damaged due to the fact that abnormal negative voltage is poured into the driving voltage output end is avoided. And when the display panel works in the second state, the driving voltage output end outputs negative voltage, and the power voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that the P-type switching tube is in a conducting state, and the purpose of conducting the driving voltage output end to the power voltage output end and the voltage input end is realized.
As shown in fig. 7, a schematic structural diagram of another display module provided by an embodiment of the present invention is shown, the on control circuit provided by the embodiment of the present invention includes a switching tube 4022, a gate and a drain of the switching tube 4022 are connected to form a first end, and a source of the switching tube 4022 is a second end; in the embodiment of the present invention, when the fixed voltage is a negative voltage and the switching tube 4022 is an N-type switching tube, a first end of the switching tube 4022 is electrically connected to the power voltage output terminal 301 and the voltage input terminal 101, and a second end of the switching tube 4022 is electrically connected to the driving voltage output terminal 201.
It can be understood that when the fixed voltage provided by the embodiment of the invention is a negative voltage and the switching tube is an N-type switching tube, the power supply voltage output end outputs a negative voltage and the driving voltage output end stops outputting the fixed voltage and is equivalent to zero voltage when the display panel works in the first state, so that the N-type switching tube is in an off state, and the purpose of disconnecting the power supply voltage output end and the voltage input end from the driving voltage output end is realized. Meanwhile, when the negative voltage output by the power supply voltage output end is abnormal, the power supply voltage output end and the voltage input end are disconnected from the driving voltage output end, so that the situation that the driving chip is damaged due to the fact that abnormal negative voltage is poured into the driving voltage output end is avoided. And when the display panel works in the second state, the driving voltage output end outputs negative voltage, and the power voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that the N-type switching tube is in a conducting state, and the purpose of conducting the driving voltage output end to the power voltage output end and the voltage input end is realized.
As shown in fig. 8, a schematic structural diagram of another display module provided by an embodiment of the present invention is shown, the on control circuit provided by the embodiment of the present invention includes a switching tube 4023, a gate and a drain of the switching tube 4023 are connected to form a first end, and a source of the switching tube 4023 is a second end; in the embodiment of the present invention, when the fixed voltage is a positive voltage and the switching tube 4023 is an N-type switching tube, a first end of the switching tube 4023 is electrically connected to the driving voltage output terminal 201, and a second end of the switching tube 4023 is electrically connected to the power voltage output terminal 301 and the voltage input terminal 101.
It can be understood that when the fixed voltage provided by the embodiment of the invention is a positive voltage and the switching tube is an N-type switching tube, the power supply voltage output end outputs a positive voltage and the driving voltage output end stops outputting the fixed voltage and is equivalent to zero voltage when the display panel works in the first state, so that the N-type switching tube is in an off state, and the purpose of disconnecting the power supply voltage output end and the voltage input end from the driving voltage output end is realized. Meanwhile, when the positive voltage output by the power supply voltage output end is abnormal, the power supply voltage output end and the voltage input end are disconnected from the channel in the direction from the driving voltage output end, so that the situation that the abnormal positive voltage is poured into the driving voltage output end to damage the driving chip is avoided. And when the display panel works in the second state, the driving voltage output end outputs positive voltage, and the power voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that the N-type switching tube is in a conducting state, and the purpose of conducting the driving voltage output end to the power voltage output end and the voltage input end in the direction is realized.
As shown in fig. 9, a schematic structural diagram of another display module provided by an embodiment of the present invention is shown, the on control circuit provided by the embodiment of the present invention includes a switching tube 4024, a gate and a drain of the switching tube 4024 are connected to form a first end, and a source of the switching tube 4024 is a second end; in the embodiment of the present invention, when the fixed voltage is a positive voltage and the switching tube 4024 is a P-type switching tube, a first end of the switching tube 4024 is electrically connected to the power voltage output terminal 301 and the voltage input terminal 101, and a second end of the switching tube 4024 is electrically connected to the driving voltage output terminal 201.
It can be understood that when the fixed voltage provided by the embodiment of the invention is a positive voltage and the switching tube is a P-type switching tube, the power supply voltage output end outputs a positive voltage and the driving voltage output end stops outputting the fixed voltage and is equivalent to zero voltage when the display panel works in the first state, so that the P-type switching tube is in an off state, and the purpose of disconnecting the power supply voltage output end and the voltage input end from the driving voltage output end is realized. Meanwhile, when the positive voltage output by the power supply voltage output end is abnormal, the power supply voltage output end and the voltage input end are disconnected from the channel in the direction from the driving voltage output end, so that the situation that the abnormal positive voltage is poured into the driving voltage output end to damage the driving chip is avoided. When the display panel works in the second state, the driving voltage output end outputs positive voltage, and the power voltage output end stops outputting fixed voltage and is equivalent to zero voltage, so that the P-type switching tube is in a conducting state, and the purpose of conducting the driving voltage output end to the power voltage output end and the voltage input end is achieved.
As shown in fig. 10, a schematic structural diagram of another display module according to an embodiment of the present invention is shown, where the driving chip 200 and/or the power chip 300 according to an embodiment of the present invention may be electrically connected to the display panel 100 through a flexible circuit board 500, and the on control circuit 400 may be integrally disposed on the flexible circuit board 500.
It can be appreciated that the display module provided by the embodiment of the invention comprises a flexible circuit board, wherein the flexible circuit board is provided with binding pins corresponding to the voltage input end of the display panel and binding pins corresponding to the driving voltage output end of the driving chip and/or the power voltage output end of the power chip, and the flexible circuit board binds the display panel, the driving chip and the power chip to realize signal interaction. The conduction control circuit provided by the embodiment of the invention can be integrally arranged on the flexible circuit board, and the display panel, the driving chip and the power chip are electrically connected with the conduction control circuit through the circuits on the flexible circuit board.
Or as shown in fig. 11, a schematic structural diagram of another display module according to an embodiment of the present invention is provided, where the driving chip 200 and/or the power chip 300 according to an embodiment of the present invention may be electrically connected to the display panel 100 through a flexible circuit board 500, and the on control circuit 400 is integrally disposed on the display panel 100.
It can be appreciated that the display module provided by the embodiment of the invention comprises a flexible circuit board, wherein the flexible circuit board is provided with binding pins corresponding to the voltage input end of the display panel and binding pins corresponding to the driving voltage output end of the driving chip and/or the power voltage output end of the power chip, and the flexible circuit board binds the display panel, the driving chip and the power chip to realize signal interaction. The conduction control circuit provided by the embodiment of the invention can be integrally arranged on the display panel, and the wiring terminal of the conduction control circuit can be electrically connected with the flexible circuit board, so that when the driving chip and the power chip are electrically connected with the display panel through the flexible circuit board, the driving chip and the power chip are electrically connected with the display panel through the circuit on the flexible circuit board and are electrically connected with the conduction control circuit.
In an embodiment of the present invention, the display panel provided by the present invention includes two working states, namely a first state and a second state, wherein when the display panel works in different states, the power supply voltage output end of the power supply chip also selectively outputs a fixed voltage or stops outputting the fixed voltage. As shown in fig. 12, a schematic structural diagram of another display module provided in the embodiment of the present invention is provided, wherein the control output terminal 202 of the driving chip 200 provided in the embodiment of the present invention is connected to the control input terminal 302 of the power chip 300, and the driving chip 200 is configured to control the power voltage output terminal 301 of the power chip 300 to stop outputting or start outputting the fixed voltage when the display panel 100 is operated in the first state or the second state.
It should be noted that, in other embodiments of the present invention, the working states of the power supply chip provided by the present invention under the conditions of the first state and the second state may also be controlled by its own control structure, or may be controlled by a chip independent of the power supply chip and the driving chip, which is not particularly limited.
Correspondingly, the embodiment of the invention also provides a display device, which comprises the display module provided by any embodiment.
Fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device 1000 according to the embodiment of the present invention may be a mobile terminal.
It should be noted that, the display device provided in the embodiment of the present invention may also be a notebook, a tablet computer, a wearable device, etc., which is not particularly limited.
The embodiment of the invention provides a display module and a display device, wherein the display module comprises a display panel, a driving chip and a power supply chip, when the display panel works in a first state, a driving voltage output end of the driving chip stops outputting fixed voltage, a power supply voltage output end of the power supply chip outputs the fixed voltage to a voltage input end of the display panel, and a conduction control circuit controls the driving voltage output end to be disconnected with the power supply voltage output end and the voltage input end respectively. And when the display panel works in the second state, the power supply voltage output end stops outputting the fixed voltage, the conduction control circuit controls the conduction between the driving voltage output end and the power supply voltage output end and between the driving voltage output end and the voltage input end, and the driving voltage output end outputs the fixed voltage to the voltage input end.
Therefore, on the basis of ensuring that the display panel works normally in the first state and the second state, when the display panel works in the first state and the fixed voltage output by the power supply voltage output end of the power supply chip is abnormal, the drive voltage output end is controlled to be disconnected from the power supply voltage output end and the voltage input end by the on control circuit, so that abnormal fixed voltage is prevented from being transmitted to the drive voltage output end of the drive chip, the damage of the abnormal fixed voltage to the drive chip is avoided, and the reliability of the display device is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A display module, comprising: a display panel, a driving chip and a power chip;
the display panel comprises a voltage input end for inputting a fixed voltage, the driving chip comprises a driving voltage output end for outputting the fixed voltage, and the power supply chip comprises a power supply voltage output end for outputting the fixed voltage;
the power supply voltage output end is electrically connected with the voltage input end, the driving voltage output end is electrically connected with a first end of a conduction control circuit, the power supply voltage output end and the voltage input end are electrically connected with a second end of the conduction control circuit, and the conduction control circuit is used for controlling the conduction or disconnection between the driving voltage output end and the power supply voltage output end and between the driving voltage output end and the voltage input end;
when the display panel works in a first state, the driving voltage output end stops outputting the fixed voltage, the power voltage output end outputs the fixed voltage to the voltage input end, and the conduction control circuit controls the driving voltage output end to be disconnected with the power voltage output end and the voltage input end respectively;
when the display panel works in the second state, the power supply voltage output end stops outputting the fixed voltage, the conduction control circuit controls the driving voltage output end to conduct between the power supply voltage output end and the voltage input end, and the driving voltage output end outputs the fixed voltage to the voltage input end.
2. The display module of claim 1, wherein the turn-on control circuit comprises a diode connected in series between the drive voltage output and the supply voltage output and the voltage input.
3. The display module of claim 2, wherein the fixed voltage is a negative voltage, an anode of the diode is electrically connected to the power supply voltage output and the voltage input, and a cathode of the diode is electrically connected to the driving voltage output.
4. The display module of claim 2, wherein the fixed voltage is a positive voltage, a cathode of the diode is electrically connected to the power supply voltage output and the voltage input, and an anode of the diode is electrically connected to the driving voltage output.
5. The display module of any one of claims 2-4, wherein the diode is a schottky diode.
6. The display module of claim 1, wherein the turn-on control circuit comprises a switching tube, a gate and a drain of the switching tube are connected to form a first end, and a source of the switching tube is a second end, wherein the first end of the switching tube and the second end of the switching tube are connected in series between the driving voltage output end and the power supply voltage output end and the voltage input end.
7. The display module of claim 6, wherein the fixed voltage is a negative voltage, and the switching tube is a P-type switching tube, a first end of the switching tube is electrically connected to the driving voltage output terminal, and a second end of the switching tube is electrically connected to the power supply voltage output terminal and the voltage input terminal;
or when the fixed voltage is a negative voltage and the switching tube is an N-type switching tube, the first end of the switching tube is electrically connected with the power supply voltage output end and the voltage input end, and the second end of the switching tube is electrically connected with the driving voltage output end.
8. The display module of claim 6, wherein the fixed voltage is a positive voltage, and the switching tube is an N-type switching tube, a first end of the switching tube is electrically connected to the driving voltage output terminal, and a second end of the switching tube is electrically connected to the power supply voltage output terminal and the voltage input terminal;
or when the fixed voltage is a positive voltage and the switching tube is a P-type switching tube, the first end of the switching tube is electrically connected with the power supply voltage output end and the voltage input end, and the second end of the switching tube is electrically connected with the driving voltage output end.
9. The display module of claim 1, wherein the driving chip and/or the power chip is electrically connected to the display panel through a flexible circuit board, and wherein the on-control circuit is integrally disposed on the flexible circuit board.
10. The display module of claim 1, wherein the driving chip and/or the power chip is electrically connected to the display panel through a flexible circuit board, and wherein the on control circuit is integrally disposed on the display panel.
11. The display module of claim 1, wherein the fixed voltage is PVDD or PVEE.
12. The display module according to claim 1, wherein the control output terminal of the driving chip is connected to the control input terminal of the power chip, and the driving chip is configured to control the power voltage output terminal of the power chip to stop outputting or start outputting the fixed voltage when the display panel is operated in the first state or the second state.
13. A display device comprising the display module of any one of claims 1-12.
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| JP2008191443A (en) * | 2007-02-06 | 2008-08-21 | Nec Electronics Corp | Display driver ic |
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| KR950006504A (en) * | 1993-08-31 | 1995-03-21 | 쯔지 하루오 | Driving voltage generator of liquid crystal display |
| EP2017815A2 (en) * | 2007-07-20 | 2009-01-21 | Samsung Electronics Co., Ltd. | Driving device, display apparatus having the same and method of driving the display apparatus |
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