CN115662347A - OLED display device and temperature protection device and method thereof - Google Patents
OLED display device and temperature protection device and method thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims description 7
- 229920001621 AMOLED Polymers 0.000 claims description 4
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- 230000020169 heat generation Effects 0.000 description 4
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- 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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- 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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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Abstract
The invention discloses an OLED display device and a temperature protection device and method thereof, wherein the temperature protection method comprises the following steps: sensing an ambient temperature of the display device; sending a voltage control signal to a power supply module according to the sensed temperature signal; when the ambient temperature is within a preset range, a first voltage provided by the power supply module to a light-emitting device in the display device is adjusted through the voltage control signal. And obtaining corresponding voltage control signals at different ambient temperatures, and controlling the voltage value of the first voltage so as to control the current flowing through the light-emitting device and ensure that the display device is not damaged by the overlarge current generated by high temperature.
Description
Technical Field
The invention relates to the technical field of organic light emitting display, in particular to an OLED display device and a temperature protection device and method thereof.
Background
Among Display technologies, an Organic Light Emitting Diode (OLED) Display is considered as a third generation Display technology following a Liquid Crystal Display (LCD) due to its advantages of lightness, thinness, active Light emission, fast response speed, wide viewing angle, rich colors, high brightness, and high and low temperature resistance.
When the OLED display device displays a picture, because the light-emitting device is particularly sensitive to temperature change, the light-emitting devices in different manufacturing processes have different current-voltage characteristic curves, when the working temperature of the display device rises, the current density of the OLED is higher under the condition that the cross voltage of the OLED is the same, and after the current density rises, the heat generation of the OLED display device is enhanced, the temperature rise of the OLED display device is further influenced, the characteristic curve changes again, and the current increases again, so that a vicious circle with continuously rising current is formed, additional power consumption is caused, and the service life of the OLED display device is further shortened due to the overlarge current.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an OLED display device and a temperature protection device and method thereof, thereby solving the technical drawbacks mentioned in the prior art.
According to an aspect of the present invention, there is provided a temperature protection method in an OLED display device, including:
sensing an ambient temperature of the display device;
sending a voltage control signal to a power supply module according to the sensed temperature signal;
when the ambient temperature is within a preset range, the first voltage provided by the power supply module to the light-emitting device in the display device is adjusted through the voltage control signal.
Preferably, when the ambient temperature is in a non-predetermined range, the power supply module is controlled to be powered off by the voltage control signal.
Preferably, the step of sending the voltage control signal to the power supply module according to the sensed temperature signal further comprises: acquiring current-voltage characteristic curves of a light-emitting device in the display device at different ambient temperatures, and introducing the current-voltage characteristic curves into an overheating protection module; establishing a temperature feedback parameter control model of the light-emitting device; and obtaining a corresponding voltage control signal according to the sensed temperature signal by referring to the temperature feedback parameter control model.
Preferably, the temperature feedback parameter control model is a control curve of a first voltage variation with temperature.
Preferably, when the ambient temperature rises within a predetermined range, the slope of the variation of the first voltage VDD with the temperature is adjusted, and the current of the light emitting device after the first voltage is adjusted is controlled to be consistent with the current during normal operation.
Preferably, the slope of the change relation of the first voltage VDD with the temperature is increased on the basis that the current of the light emitting device after the first voltage is adjusted is consistent with the current in the normal operation, and the current of the light emitting device after the first voltage is adjusted is controlled to be lower than the current in the normal operation.
Preferably, the predetermined range is 30 ℃ or more and 50 ℃ or less, and the non-predetermined range is 50 ℃ or more.
Preferably, the step of establishing a temperature feedback parameter control model of the light emitting device includes: the light-emitting device is placed at different environmental temperatures in advance, and various parameters of the light-emitting device working at the different environmental temperatures are obtained.
According to another aspect of the present invention, there is provided a temperature protection device in an OLED display device, for performing the claims including: the temperature detection element is used for detecting the ambient temperature of the light-emitting device and sending a sensed temperature signal to the overheating protection module; and the overheating protection module is used for sending a voltage control signal to the power supply module according to the sensed temperature signal, and adjusting a first voltage provided by the power supply module to a light-emitting device in the display device through the voltage control signal.
According to still another aspect of the present invention, there is provided an OLED display device including the above temperature protection device, wherein the OLED array in the OLED display device includes any one of micro OLEDs and AMOLEDs.
According to the temperature protection method provided by the invention, the current-voltage characteristic curves of the light-emitting device at different environmental temperatures are obtained in advance and are led into the overheating protection module to construct the temperature feedback parameter control model of the light-emitting device, namely, the corresponding voltage control signal Va can be obtained at different environmental temperatures by referring to the temperature feedback parameter control model, the voltage value of the first voltage VDD is controlled, and the current of the light-emitting device is further controlled. In a preferred embodiment, the slope of the variation relation of the first voltage VDD with the temperature in the temperature feedback parameter control model can be changed, so as to realize the constant current control or the over-current control of the light emitting device.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic structural diagram of an OLED display device according to the prior art;
FIG. 2a is a schematic structural diagram of an OLED display device according to an embodiment of the present invention;
FIG. 2b is a flowchart illustrating a temperature protection method of an OLED display device according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a method for varying the voltage across the light emitting device according to an embodiment of the present invention;
fig. 4 is a graph illustrating a current density versus voltage characteristic of a light emitting device provided in accordance with an embodiment of the present invention;
fig. 5 illustrates a control model curve of the first voltage VDD according to the temperature variation provided by the embodiment of the present invention;
fig. 6 is a graph showing the current of the light emitting device before and after being processed by the temperature protection device according to the embodiment of the present invention as a function of time.
Fig. 7 is a graph showing the change of the ambient temperature of the display device with time before and after the constant current control process by the temperature protection device according to the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, the same elements or modules are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
It should be understood that in the following description, "circuitry" may comprise singly or in combination hardware circuitry, programmable circuitry, state machine circuitry, and/or elements capable of storing instructions executed by programmable circuitry. When an element or circuit is referred to as being "connected to" another element or circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that the two be absent intermediate elements.
Also, certain terms are used throughout the description and claims to refer to particular components. As one of ordinary skill in the art will appreciate, manufacturers may refer to a component by different names. This patent specification and claims do not intend to distinguish between components that differ in name but not function.
Moreover, it should be further noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Fig. 1 shows a schematic structural diagram of an OLED display device according to the prior art;
as shown in fig. 1, the OLED display device in the related art includes a display panel 10, a source driving circuit and a gate driving circuit, wherein the display panel 10 includes a plurality of gate lines G1 to Gm, a plurality of data lines S1 to Sn, and a plurality of pixel regions 4 including organic light emitting diodes OLED; the gate driver is configured to supply a gate voltage to the display panel 10 through a plurality of gate lines G1 to Gm in a display state; the source driver is configured to provide source data voltages (also referred to as gray scale voltages) to the display panel 10 through a plurality of data lines in a display state, and under the control of the gate voltage, the pixel regions connected to the same data line in the plurality of pixel regions 4 can emit lights of the same color. For example, light of any one of red, green, blue, or another color may be emitted.
When the OLED display device works, because the OLED is particularly sensitive to temperature change, when the working temperature of the OLED display device rises, the current density of the OLED is higher under the condition that the voltage across the OLED is the same, and after the current density rises, the heat generation of the OLED display device is enhanced, the temperature rise of the OLED display device is further influenced, and the current is increased again along with the change of the characteristic curve, so that a vicious circle with continuously rising current is formed, extra power consumption is caused, and the service life of the OLED display device is shortened due to the excessive current.
FIG. 2a is a flow chart showing a schematic structure of an OLED display device provided according to an embodiment of the present invention;
as shown in fig. 2a, the OLED display device according to the embodiment of the present invention includes a display panel 10, a driving display module, and a temperature protection device 20.
The display panel 10 includes a plurality of gate lines G1 to Gm, a plurality of data lines S1 to Sn, and a plurality of pixel regions 4, wherein the plurality of pixel regions 4 include a plurality of pixel units 2, a plurality of organic light emitting diodes OLED, and a plurality of cathode electrodes (not shown) corresponding to the plurality of pixel regions 4, where m and n are positive integers. The driving display module comprises a power supply module 40, wherein the power supply module 40 is connected to the display panel 10 and is used for supplying a first voltage VDD to the display panel 10. Wherein the pixel region 4 is connected to the gate line Gm, the data line Sn, and the first voltage VDD.
In the present embodiment, the pixel region 4 of the display panel 10 includes an organic light emitting diode OLED, and a pixel unit 2 connected to the gate line Gm and the data line Sn to control the OLED. Wherein the cathode of the OLED is connected to the pixel cell 2 and the anode of the OLED is connected to the first voltage VDD.
Wherein the pixel unit 2 controls the amount of current supplied to the OLED in response to the data signal supplied to the data line Sn when the scan signal is supplied to the gate line Gm, and the OLED generates light of a predetermined brightness in response to the current supplied from the pixel unit 2.
The display driving module is used for providing scanning signals and data signals to the display panel in a display state so as to drive the touch display panel to display. Wherein, the driving display module comprises a gate driving circuit 32 for providing a gate voltage to the display panel 10 in a display state; and a source driving circuit 31 for supplying a gray scale voltage to the display panel 10 in a display state.
The OLED display device further includes an over-temperature compensation system 20 for automatically adjusting the first voltage VDD supplied to the display panel according to the ambient temperature of the display panel 10.
The temperature protection device 20 includes a temperature detection element 21 and an overheat protection module 22;
the temperature detecting element 21 is configured to detect an ambient temperature of the light emitting device (i.e., the above OLED), and send a temperature signal Tsen to the overheating protection module 22, where the temperature detecting element is, for example, a temperature measuring element such as a temperature sensitive resistor, a thermocouple, or a thermometer, and the application is not limited thereto.
The overheating protection module 22 is configured to provide a voltage control signal Va to the power supply module 40 according to the temperature signal Tsen, and control a voltage value of the first voltage VDD provided by the power supply module 40 to the display panel 10.
FIG. 2b is a flowchart illustrating a method for protecting temperature of an OLED display device according to an embodiment of the present invention;
as shown in fig. 2b and with reference to fig. 2a, in this embodiment, the temperature sensing element 21 and the overheating protection module 22 in the temperature protection device 20 together perform a plurality of steps of the temperature protection method. For example, in the OLED display device displaying process, the temperature protection device 20 performs steps S11 to S15 described in detail below.
In step S11, the light emitting device operates normally.
In this step, the light emitting device, for example, the OLED in the pixel region 4 described above, normally operates in an initial state.
In step S12, the ambient temperature of the display device is sensed.
In this step, the ambient temperature of the display device is sensed by the temperature detection element 21 in the temperature protection device 20.
In this embodiment, the temperature detection element is disposed on the back surface of the light emitting device encapsulation layer in the OLED display device and is used for detecting the ambient temperature of the display device, and the temperature detection element 21 is connected to the overheating protection module 22 to realize sending of the temperature signal Tsen of the ambient temperature to the overheating protection module 22.
In step S13, it is determined whether the ambient temperature is greater than the set temperature.
In this step, if the ambient temperature is equal to or less than the set temperature, it is determined that the light emitting device temperature is within a predetermined range, step S15 is performed, and if the ambient temperature is greater than the predetermined temperature, it is determined that the light emitting device temperature is too high, within a non-predetermined range, for example, greater than 50 ℃, and operating at this temperature may reduce the lifetime of the OLED display device, step S14 is performed.
In step S14, the power supply module is controlled to be powered off.
In this step, the overheating protection module 22 sends a voltage control signal Va to the power supply module 40 according to the temperature signal Tsen, and when the ambient temperature is too high, the voltage control signal Va controls the power supply module 40 to be powered off, so that the display device stops working, and the system is forced to enter a sleep state, so as to ensure that the device is not damaged by an excessive current generated by a high temperature.
In step S15, the power supply module is controlled to output the first voltage according to the ambient temperature.
In this step, the overheating protection module 22 sends a voltage control signal Va to the power supply module 40 according to the temperature signal Tsen, and the voltage control signal Va controls the power supply module 40 to output the first voltage VDD when the ambient temperature is within a predetermined range, for example, greater than or equal to 30 ℃ and less than or equal to 50 ℃.
It should be additionally noted that the predetermined range and the non-predetermined range may be adjusted according to actual situations, and the present application is not limited thereto.
FIG. 3 is a flow chart illustrating a method for varying the voltage across the light emitting device according to an embodiment of the present invention;
fig. 4 is a graph illustrating a current density versus voltage characteristic of a light emitting device provided in accordance with an embodiment of the present invention;
as shown in fig. 3, the method is used, for example, for the overheating protection module 22 in the temperature protection device 20, and step S15 in the flowchart of the temperature protection method of fig. 2b is executed.
In step S21, the current-voltage characteristic curves of the light emitting device shown in fig. 4 at different ambient temperatures are obtained and introduced into the overheating protection module.
In this step, the light emitting device is placed at different environmental temperatures in advance, various parameters of the light emitting device at different environmental temperatures (i.e., current-voltage characteristic curves corresponding to different environmental temperatures) are obtained, and the curves are led into the overheating protection module 22.
Illustratively, an anode and a cathode of a light-emitting device are respectively connected to a positive pole and a negative pole of a direct-current voltage stabilization source, the light-emitting device is placed in a test box, the temperature in the test box is sequentially adjusted to 30 ℃, 40 ℃ and 50 ℃, the light-emitting device is electrified after the temperature is maintained for one hour every time, the voltage between the anode and the cathode of the light-emitting device is adjusted from 4V to 12V, the step length is 0.1V, the current readings of the OLED device displayed by the voltage stabilization source are read and recorded under each voltage, and then the current-voltage pairs of the OLED device under each temperature are drawn through tracing points to obtain current-voltage (I-V) characteristic curves at two ends of the anode and the cathode of the light-emitting device under different environmental temperatures; the temperature node, the voltage range and the step length can be adjusted according to actual conditions, and the invention is not limited to this.
As shown in fig. 4, in the current-voltage characteristic curves of the light emitting device at different ambient temperatures, the higher the voltage across the light emitting device is, the higher the current density of the light emitting device is, and vice versa. And under the same cross voltage of the light-emitting device, the higher the temperature is, the higher the current density of the light-emitting device is, when the ambient temperature of the display device is increased, the current of the light-emitting device can still keep the state before the temperature change by controlling the cross voltage of the light-emitting device, so that the heat generation of the light-emitting device is reduced.
In step S22, a temperature feedback parameter control model of the light emitting device is established.
Illustratively, a temperature feedback parameter control model may be constructed according to the current-voltage characteristic curves of the light emitting device at different ambient temperatures, when the ambient temperature of the display device increases, the corresponding voltage control signal Va is obtained through calculation, for example, when the ambient temperature increases to 40 ℃, the corresponding voltage control signal Va obtained through calculation may adjust the current of the light emitting device to a current when the light emitting device normally operates at 30 ℃ by controlling the first voltage VDD, and so on, when the ambient temperature is 50 ℃, corresponding processing is also performed according to the current-voltage (I-V) characteristic curves at the anode and the cathode of the light emitting device.
For example, when the ambient temperature is other values, the corresponding voltage control signal Va may be automatically calculated by a linear interpolation method to establish a temperature feedback parameter control model of the light emitting device. I.e. a control curve corresponding to the first voltage VDD as a function of temperature as shown in fig. 5.
In step S23, the voltage across the light emitting device in the pixel circuit is automatically changed according to the temperature feedback parameter control model.
Fig. 5 illustrates a control curve of the first voltage VDD according to the temperature variation provided by the embodiment of the present invention; fig. 6 is a graph showing the current of the light emitting device before and after being processed by the temperature protection device according to the embodiment of the present invention as a function of time.
Referring to fig. 5 and 6, after the temperature feedback parameter control model of the light emitting device is established, the voltage value of the first voltage VDD can be controlled by obtaining the corresponding voltage control signal Va at different environmental temperatures with reference to the temperature feedback parameter control model, so as to control the current of the light emitting device.
For example, when the ambient temperature rises within a predetermined range, the slope of the change relationship of the first voltage VDD with the temperature in the temperature feedback parameter control model may be changed so that the current of the light emitting device processed by the temperature protection device is always a constant value within the predetermined temperature range (corresponding to the horizontal dashed line in fig. 6), and further, the slope of the change relationship of the first voltage VDD with the temperature may be increased so that the current of the light emitting device is lower than the current in normal operation (corresponding to the solid current change line of the light emitting device processed by the temperature protection device in fig. 6) when the temperature rises, so as to implement overcurrent protection to suppress the heat generation of the light emitting device and reduce the vicious circle that the ambient temperature further rises and the current increases again.
The method for changing the cross-voltage of the light emitting device according to the flowchart of the embodiment includes obtaining a current-voltage characteristic curve of the light emitting device at different environmental temperatures in advance, and introducing the current-voltage characteristic curve into the overheat protection module to construct a temperature feedback parameter control model of the light emitting device, that is, obtaining corresponding voltage control signals Va at different environmental temperatures with reference to the temperature feedback parameter control model, and controlling the voltage value of the first voltage VDD to further control the current of the light emitting device. In a preferred embodiment, the slope of the variation relation of the first voltage VDD with the temperature in the temperature feedback parameter control model can be changed, so as to realize the constant current control or the over-current control of the light emitting device.
Fig. 7 is a graph showing the change of the ambient temperature of the display device with time before and after the constant current control process by the temperature protection device according to the present invention.
As shown in fig. 7, after the constant current control processing of the temperature protection device provided by the present invention, the ambient temperature of the display device can be stabilized in a lower range compared to before the processing, thereby reducing the situation that the display device stops working when the ambient temperature is too high, forcing the system to enter into a sleep state, reducing the current of the light emitting device, and reducing the power consumption of the display device.
In an embodiment of the present invention, there is also provided an OLED display device, where the temperature protection device is mounted on the OLED display device, and specifically, the OLED array in the OLED display device includes any one of a micro OLED and an Active-matrix Organic Light Emitting Diode (AMOLED).
It should be noted that as used herein, the words "during", "when" and "when … …" in relation to circuit operation are not strict terms referring to actions that occur immediately at the start of a startup action, but rather there may be some small but reasonable delay or delays, such as various transmission delays, between them and the reactive action (action) initiated by the startup action, and the like, as will be appreciated by those of ordinary skill in the art. The words "about" or "substantially" are used herein to mean that the element value (element) has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there is always a slight deviation that makes it difficult for the value or position to be exactly the stated value. It has been well established in the art that a deviation of at least ten percent (10%) for a semiconductor doping concentration of at least twenty percent (20%) is a reasonable deviation from the exact ideal target described. When used in conjunction with a signal state, the actual voltage value or logic state (e.g., "1" or "0") of the signal depends on whether positive or negative logic is used.
In accordance with the present invention, as set forth above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The scope of the invention should be determined with reference to the appended claims and their equivalents.
Claims (10)
1. A method of temperature protection in an OLED display device, comprising:
sensing an ambient temperature of the display device;
sending a voltage control signal to a power supply module according to the sensed temperature signal;
when the ambient temperature is within a preset range, a first voltage provided by a power supply module to a light-emitting device in the display device is adjusted through the voltage control signal.
2. The temperature protection method of claim 1, further comprising:
and when the ambient temperature is in a non-predetermined range, controlling the power supply module to be powered off through the voltage control signal.
3. The temperature protection method of claim 1, wherein the step of issuing a voltage control signal to a power supply module in accordance with the sensed temperature signal is preceded by the step of:
acquiring current-voltage characteristic curves of a light-emitting device in the display device at different ambient temperatures, and introducing the current-voltage characteristic curves into an overheating protection module;
establishing a temperature feedback parameter control model of the light-emitting device;
and obtaining a corresponding voltage control signal according to the sensed temperature signal by referring to the temperature feedback parameter control model.
4. The temperature protection method of claim 3, wherein the temperature feedback parameter control model is a control curve of the first voltage with temperature variation.
5. The temperature protection method according to claim 4, wherein when the ambient temperature rises within a predetermined range, the slope of the change of the first voltage with the temperature is adjusted, and the light emitting device is controlled to adjust the current after the first voltage to be consistent with the current in normal operation.
6. The temperature protection method according to claim 5, wherein the slope of the change relationship with temperature of the first voltage is increased on the basis that the current of the light emitting device after the first voltage is adjusted is consistent with the current in normal operation, and the current of the light emitting device after the first voltage is adjusted is controlled to be lower than the current in normal operation.
7. The temperature protection method according to claim 1, wherein the predetermined range is 30 ℃ or more and 50 ℃ or less, and the non-predetermined range is 50 ℃ or more.
8. The temperature protection method according to claim 3, the step of establishing a temperature feedback parameter control model of the light emitting device comprising: the light-emitting device is placed at different environmental temperatures in advance, and various parameters of the light-emitting device working at the different environmental temperatures are obtained.
9. A temperature protection device in an OLED display device, comprising: a temperature detection element and an overheating protection module,
the temperature detection element is used for detecting the ambient temperature of the light-emitting device and sending a sensed temperature signal to the overheating protection module;
and the overheating protection module is used for sending a voltage control signal to the power supply module according to the sensed temperature signal, and adjusting a first voltage provided for a light-emitting device in the display device by the power supply module through the voltage control signal.
10. An OLED display device comprising the temperature protection device of claim 9, wherein the OLED array in the OLED display device comprises any one of micro OLEDs, AMOLEDs.
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| CN202211301847.4A CN115662347A (en) | 2022-10-24 | 2022-10-24 | OLED display device and temperature protection device and method thereof |
| PCT/CN2023/111610 WO2024087794A1 (en) | 2022-10-24 | 2023-08-08 | Oled display apparatus, and temperature protection apparatus and method therefor |
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| CN202211301847.4A CN115662347A (en) | 2022-10-24 | 2022-10-24 | OLED display device and temperature protection device and method thereof |
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| WO2024087794A1 (en) * | 2022-10-24 | 2024-05-02 | 集创北方(珠海)科技有限公司 | Oled display apparatus, and temperature protection apparatus and method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH087338B2 (en) * | 1990-04-17 | 1996-01-29 | パイオニア株式会社 | Image display device |
| KR100658672B1 (en) * | 2003-11-27 | 2006-12-15 | 삼성에스디아이 주식회사 | An organic electroluminescent display and a driving method thereof |
| KR20100023083A (en) * | 2008-08-21 | 2010-03-04 | 엘지디스플레이 주식회사 | Organic electro-luminescence display device |
| KR101142702B1 (en) * | 2010-05-06 | 2012-05-03 | 삼성모바일디스플레이주식회사 | Organic light emitting display and driving method using the same |
| KR101442680B1 (en) * | 2012-10-15 | 2014-09-19 | 엘지디스플레이 주식회사 | Apparatus and method for driving of organic light emitting display device |
| CN105792471A (en) * | 2014-12-26 | 2016-07-20 | 凹凸电子（武汉）有限公司 | Light source driving circuit, controller and control method |
| CN106910461B (en) * | 2017-05-11 | 2020-12-22 | 京东方科技集团股份有限公司 | Display panel, display device and display driving method |
| CN114360455B (en) * | 2022-01-18 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | display device |
| CN115662347A (en) * | 2022-10-24 | 2023-01-31 | 集创北方(珠海)科技有限公司 | OLED display device and temperature protection device and method thereof |
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| WO2024087794A1 (en) * | 2022-10-24 | 2024-05-02 | 集创北方(珠海)科技有限公司 | Oled display apparatus, and temperature protection apparatus and method therefor |
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