CN111490671B - Power module and display device - Google Patents

Power module and display device Download PDF

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Publication number
CN111490671B
CN111490671B CN202010321492.XA CN202010321492A CN111490671B CN 111490671 B CN111490671 B CN 111490671B CN 202010321492 A CN202010321492 A CN 202010321492A CN 111490671 B CN111490671 B CN 111490671B
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China
Prior art keywords
voltage
power
display panel
resistor
electrode
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CN202010321492.XA
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CN111490671A (en
Inventor
杨抒臻
阳智勇
王开民
胡红伟
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to CN202010321492.XA priority Critical patent/CN111490671B/en
Publication of CN111490671A publication Critical patent/CN111490671A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output

Abstract

The invention relates to a power module, which is applied to a display panel, wherein the display panel comprises a plurality of pixel units, each pixel unit comprises a pixel circuit, the power module is used for providing a first power supply voltage ELVDD for the pixel circuit, and the power module comprises: a first power line connected to the pixel circuit of the display unit to output a first power supply voltage ELVDD to the display panel; and the charge releasing unit is connected with the first power transmission line and used for releasing charges when the voltage on the first power transmission line exceeds a preset voltage. The invention also relates to a display device.

Description

Power module and display device
Technical Field
The invention relates to the technical field of display product manufacturing, in particular to a power module and a display device.
Background
Flexible AMOLDE (Active-matrix organic light-emitting diode) screens have been developed rapidly in recent years, and have been gradually developed from curved screens to folding screens, and the bending angle has been gradually increased from within 90 ° to 180 ° in opposite folding, and the size has also been gradually increased from 5.5 inches to 8 inches. The increase in size inevitably requires a higher driving capability of the DC-DC circuit, and a larger current output to correspond to a large-sized screen.
The main function of the DC-DC is to provide a stable DC output voltage in cooperation with the dynamic output voltage of the battery to meet the display requirements. But if there is a large leakage inside the Panel or the DC-DC load capability is not sufficient, it will be influenced by the Panel status to increase. If the ELVDD voltage fed back internally by the Panel exceeds the clamping capability of the DC-DC, the DC-DC will be caused to stop outputting, and the Panel display will be abnormal.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a power module and a display device, which solve the problem of abnormal display caused by abnormal DC-DC output due to an increase in ELVDD voltage caused by Panel leakage or design defects.
In order to achieve the purpose, the invention adopts the technical scheme that: a power module applied to a display panel, the display panel including a plurality of pixel units, each pixel unit including a pixel circuit, the power module for supplying a first supply voltage ELVDD to the pixel circuit, comprising:
a first power line connected to the pixel circuit of the display unit to output a first power supply voltage ELVDD to the display panel;
and the charge releasing unit is connected with the first power transmission line and used for releasing charges when the voltage on the first power transmission line exceeds a preset voltage.
Optionally, the charge releasing unit includes a resistor having a resistance value greater than a preset value, one end of the resistor is connected to the first power line, and the other end of the resistor is grounded.
Optionally, the resistor is a variable resistor.
Optionally, the resistor is a thin film transistor, the charge discharging unit further includes an adjusting portion, a first electrode of the thin film transistor is connected to the first power line, a second electrode of the thin film transistor is grounded, a gate of the thin film transistor is connected to the adjusting portion, and the adjusting portion applies different voltages to the gate to adjust a resistance value of the resistor.
Optionally, the first electrode is a source electrode, and the second electrode is a drain electrode.
Optionally, the method further includes:
the voltage detection unit is used for detecting driving voltage required by display of the display panel and outputting a first signal;
and the voltage output unit is connected with the input end of the first power transmission line and used for outputting a first power supply voltage ELVDD to the display panel according to the first signal.
Optionally, the voltage output unit includes a DC-DC circuit.
The embodiment of the invention also provides a display device which is characterized by comprising a display panel and the power supply module.
Optionally, the power module further includes a chip on film, and the power module is connected to the driving chip of the chip on film to provide a second power supply voltage for the driving chip.
The invention has the beneficial effects that: by the arrangement of the charge discharging unit, when the ELVDD voltage is abnormally raised, the discharge of the charges is performed, and the abnormal display is not formed.
Drawings
FIG. 1 is a schematic diagram of a power module according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a portion of a display device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a resistor structure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the description of the embodiments of the invention given above, are within the scope of protection of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
At present, a DC-DC (direct current-direct current) of a mobile phone generally outputs three-way voltage, namely AVDD (6.7-7.6V) voltage, and supplies power for an IC (drive chip) so as to provide GOA (gate driver on array) and GAMMA (GAMMA voltage); the voltage of ELVDD (4.6V)/ELVSS (-2.4-3.5V) is input into the Panel to drive the OLED to light the screen. In which an increase in size of Panel inevitably causes an increase in EL (light emitting device) current, which requires a higher load capacity of DC-DC. However, the load capacity of the DC-DC is difficult to be greatly improved due to special design and requirements.
The theoretical voltage of Panel _ ELVDD is about 4.6V in a floating state or in a solid black screen (Vdata ═ 6.4V). If there is TFT leakage, the voltage will rise to over 4.6V, and once the voltage exceeds 4.6V, the Vdata voltage will increase under the AVC function (voltage compensation), resulting in the patch _ ELVDD increasing, forming a positive feedback, so that the patch _ ELVDD voltage continues to rise to around 7V. When the voltage of Panel _ ELVDD exceeds 6V, the DC-DC _ ELVDD is probabilistically caused to stop outputting under the condition of connecting DC-DC, and at the moment, Vdata directly drives the OLED to light the screen to form a display abnormal state.
In view of the above problem, the present embodiment provides a power module, which is applied to a display panel, the display panel includes a plurality of pixel units, each pixel unit includes a pixel circuit, and the power module is configured to provide a first supply voltage ELVDD to the pixel circuit, as shown in fig. 1 and 2, and includes:
a first power line 3 connected to a pixel circuit of the display unit to output a first power supply voltage ELVDD to the display panel;
a charge discharging unit 1 connected to the first power line 3 for discharging charge when the voltage on the first power line 3 exceeds a preset voltage.
The charge releasing unit 1 is arranged to stabilize the ELVDD voltage at 0V, which is not raised to more than 4.6V, and then Vdata is not raised to cause the TFT to aggravate the leakage current, and no abnormal display is formed.
The specific structural form of the charge discharging unit 1 may be various, and in this embodiment, the charge discharging unit 1 includes a resistor having a resistance value greater than a preset value, one end of the resistor is connected to the first power line 3, and the other end is grounded.
The preset value may be set according to actual requirements, and in a specific implementation manner of this embodiment, in view of reducing power consumption, the resistance value of the resistor is 50K, but not limited thereto.
The power consumption can be controlled by changing the resistance of the resistor, and the display effect is not affected, and there are various ways to change the resistance of the resistor, and the two ways in this embodiment are described in detail below.
In a first embodiment of this embodiment, a required resistance value of a resistor may be obtained through testing, and then a change of the resistance value of the resistor is realized in a manufacturing process engineering of the resistor, in an embodiment, the resistor includes a first electrode, a second electrode, and a polysilicon active layer located between the first electrode and the second electrode, and the resistance value of the resistor may be changed by changing a width-to-length ratio of the polysilicon active layer between the first electrode and the second electrode, and specifically, in an embodiment, the resistor includes: the resistance of the gate electrode is changed by changing the width-to-length ratio of a first portion of the polysilicon active layer 20 between the source electrode 40 and the drain electrode 50 (in fig. 3, the X direction is a length direction, and the width direction is a direction perpendicular to the X direction), the resistance is increased when the length of the first portion is increased, and the resistance is decreased when the width is increased.
It should be noted that the gate is in a floating state in actual use, or a fixed and unchangeable voltage is provided to the gate, but the resistor may not include the gate, and the specific structural form may be set according to actual needs.
By adopting the above technical scheme, the required resistance value of the resistor needs to be obtained before the resistor is manufactured, once the resistor is manufactured, the resistance value of the resistor is not variable, in order to enable the resistance value of the resistor to be adjusted more flexibly, in the second implementation manner of this embodiment, the resistor is a variable resistor, power consumption is controllable, that is, the resistance value of the resistor does not need to be controlled from the aspect of manufacturing process, and the resistance value of the resistor can be adjusted after the resistor is manufactured.
In a second embodiment of this embodiment, the resistor is a thin film transistor, the charge discharging unit further includes an adjusting portion, a first electrode of the thin film transistor is connected to the first power line, a second electrode of the thin film transistor is grounded, a gate of the thin film transistor is connected to the adjusting portion, and the adjusting portion applies different voltages to the gate 10 to adjust a resistance value of the resistor.
Optionally, the first electrode is a source 40, and the second electrode is a drain 50, referring to fig. 3.
The adjusting portion applies different voltages to the gate, so that the magnitude of the resistance can be adjusted, and further, the magnitude of the current of the charge discharging unit 1 can be adjusted, and further, the power consumption can be adjusted.
In this embodiment, the charge discharging unit 1 is configured to be compatible with the current backplane manufacturing process, and additional equipment and cost are not added.
In an embodiment of this embodiment, the structure of the thin film transistor is the same as that of the thin film transistor in the pixel circuit of the display panel, and the thin film transistor in the pixel circuit have the same structure and layer and are formed by a synchronous process, so that the process steps are simplified, and no additional process is required.
Referring to fig. 3, the structural process of forming the thin film transistor of the resistor includes:
forming an insulating layer 10;
forming a polysilicon active layer 20 on the first region of the insulating layer 10;
forming a gate insulating layer 30 on the polysilicon active layer 20;
forming a gate electrode 70 on the gate insulating layer 30;
forming via holes on the gate insulating layer 30, and forming a source electrode 40 and a drain electrode 50 connected to the polysilicon active layer 20 through the via holes;
an insulating layer 60 covering the source electrode 40, the drain electrode 50 and the gate electrode 70 is formed at the periphery of the first region of the insulating layer 10.
It should be noted that, the thin film transistor forming the resistor in this embodiment is a top gate structure, but not limited thereto.
In an embodiment of this embodiment, the width-to-length ratio of the portion of the polysilicon active layer 20 between the source electrode 40 and the drain electrode 50 can be changed to change the magnitude of the resistor.
The width-to-length ratio of the portion of the polysilicon active layer 20 between the source electrode 40 and the drain electrode 50 is increased, and the resistance value of the resistor is reduced, and the width-to-length ratio of the portion of the polysilicon active layer 20 between the source electrode 40 and the drain electrode 50 is reduced, and the resistance value of the resistor is increased. The length direction of the portion of the polysilicon active layer 20 between the source electrode 40 and the drain electrode 50 is parallel to the X direction in fig. 3.
In an embodiment of this embodiment, the adjusting portion may be integrated in a driving chip of the pixel circuit, that is, the driving chip provides different gate voltages according to data line voltages for displaying different gray scales, generally, the gate voltage of the resistor is opposite to the data line voltage of the pixel circuit, for example, the data line voltage is generally 1-6.4V, and the gate voltage provided is 6.4V when the data line voltage is 1V.
In addition, compared to the first embodiment, the power module in this embodiment preferably uses the resistor of the second embodiment, and the resistance value of the resistor is flexibly adjusted by the adjusting portion.
In this embodiment, the power module further includes:
a voltage detection unit for detecting a driving voltage required for displaying on the display panel 5 and outputting a first signal;
and a voltage output unit 2 connected to an input terminal of the first power line 3, for outputting a first supply voltage ELVDD to the display panel 5 according to the first signal.
The first signal is a pulse signal, and the voltage output unit 2 outputs a first supply voltage ELVDD to the display panel 5 according to the first signal to light the OLED screen.
In this embodiment, the voltage output unit 2 includes a DC-DC circuit. The main function of the DC-DC circuit is to provide stable DC output voltage in cooperation with the dynamic output voltage of the battery so as to meet the display requirement.
The present embodiment further provides a display device, which is characterized by comprising a display panel 5 and the power module.
The charge releasing unit 1 is arranged to stabilize the ELVDD voltage at 0V, which is not raised to more than 4.6V, and then Vdata is not raised to cause the TFT to aggravate the leakage current, and no abnormal display is formed.
In this embodiment, the display device further includes a chip on film 4 disposed on one side of the display panel, and the power module is connected to a driving chip of the chip on film 4 to provide a second power supply voltage for the driving chip.
Specifically, the voltage output unit 2 in the power module is connected to the driving chip of the chip on film 4, that is, the output terminal of the DC-DC circuit is connected to the input terminal of the first power line 3, so as to provide the first supply voltage ELVDD for the pixel circuit in the display panel.
The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet personal computer and the like, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A power module applied to a display panel, the display panel including a plurality of pixel units, each pixel unit including a pixel circuit, the power module being configured to provide a first supply voltage ELVDD to the pixel circuit, the power module comprising:
a first power line connected to the pixel circuit of the display panel to output a first power supply voltage ELVDD to the display panel;
the charge releasing unit is connected with the first power transmission line and used for releasing charge when the voltage on the first power transmission line exceeds a preset voltage so as to reduce the voltage on the first power transmission line to be less than the preset voltage;
wherein the pixel circuit is commonly driven by the first supply voltage ELVDD and a data voltage, when a TFT in the pixel circuit leaks and the power supply module does not include the charge discharging unit, such that a voltage on the first power line increases, a data voltage of the pixel circuit increases as the voltage on the first power line increases, the voltage on the first power line further increases as the data voltage increases, such that when the voltage on the first power line continuously increases to exceed the preset voltage, the power supply module stops outputting the first supply voltage ELVDD, and the data voltage of the pixel circuit directly drives an OLED lighting screen.
2. The power supply module according to claim 1, wherein the charge discharging unit includes a resistor having a resistance value greater than a predetermined value, one end of the resistor being connected to the first power line, and the other end being grounded.
3. The power module of claim 2, wherein the resistor is a variable resistor.
4. The power supply module according to claim 1, wherein the charge discharging unit includes a thin film transistor, the charge discharging unit further includes a regulating portion, a first electrode of the thin film transistor is connected to the first power line, a second electrode of the thin film transistor is connected to ground, a gate of the thin film transistor is connected to the regulating portion, and the regulating portion applies different voltages to the gate to regulate a resistance value between the first electrode and the second electrode.
5. The power supply module of claim 4, wherein the first electrode is a source and the second electrode is a drain.
6. The power module of claim 1, further comprising:
the voltage detection unit is used for detecting driving voltage required by display of the display panel and outputting a first signal;
and the voltage output unit is connected with the input end of the first power transmission line and used for outputting a first power supply voltage ELVDD to the display panel according to the first signal.
7. The power supply module of claim 6, wherein the voltage output unit comprises a DC-DC circuit.
8. A display device comprising a display panel and the power module of any one of claims 1-7.
9. The display device according to claim 8, further comprising a chip on film, wherein the power module is connected to a driving chip of the chip on film to provide a second power supply voltage to the driving chip.
CN202010321492.XA 2020-04-22 2020-04-22 Power module and display device Active CN111490671B (en)

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CN111490671B true CN111490671B (en) 2022-06-03

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105939111A (en) * 2015-03-03 2016-09-14 三星显示有限公司 Dc-dc converter
CN106887211A (en) * 2017-04-24 2017-06-23 昆山国显光电有限公司 Power supply chip and display device
CN208737864U (en) * 2018-09-18 2019-04-12 惠科股份有限公司 Electric discharge protection circuit, display panel and display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105939111A (en) * 2015-03-03 2016-09-14 三星显示有限公司 Dc-dc converter
CN106887211A (en) * 2017-04-24 2017-06-23 昆山国显光电有限公司 Power supply chip and display device
CN208737864U (en) * 2018-09-18 2019-04-12 惠科股份有限公司 Electric discharge protection circuit, display panel and display device

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