CN115762401A - Organic light emitting diode display circuit and display device - Google Patents
Organic light emitting diode display circuit and display device Download PDFInfo
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Abstract
The application discloses organic light emitting diode display circuit and display device, organic light emitting diode display circuit, the grid connection of first luminescent thin film transistor sends out light control module, one in source electrode or the drain-source resistance of first luminescent thin film transistor connects drive circuit, another connects first organic light emitting diode, organic light emitting diode display circuit still includes second luminescent thin film transistor and second organic light emitting diode, the grid connection of second thin film transistor sends out light control module, one of source electrode or the drain-source resistance of second thin film transistor connects drive circuit, another connects second organic light emitting diode. The application provides an organic light emitting diode display circuit, every drive circuit drives two organic light emitting diodes to make the organic light emitting diode that every pixel corresponds have two, two organic light emitting diodes can alternate use, thereby it is long when increasing the illumination, can make the life-span of pixel longer.
Description
Technical Field
The present disclosure relates to display panels, and particularly to an organic light emitting diode display circuit and a display device.
Background
The organic light emitting display technology has advantages of self-luminescence, lightness, thinness, low power consumption, wide viewing angle, high resolution and the like, and is gradually applied to products such as televisions, mobile phones, various computer displays and the like. The organic light emitting display technology is mainly realized by means of pixels distributed on an array substrate, wherein each pixel corresponds to an organic light emitting diode.
However, the lifetime of the organic light emitting diode is relatively low, and the organic light emitting diode is easily damaged after a long time operation, thereby affecting the display effect and lifetime of the display.
Disclosure of Invention
The technical problem that this application mainly solved provides an organic light emitting diode display circuit and display device, can solve among the prior art because of organic light emitting diode damages easily to influence the display effect and the problem of life-span of display.
In order to solve the technical problem, the application adopts a technical scheme that: the organic light emitting diode display circuit comprises a light emitting control module, a drive circuit, a first light emitting thin film transistor and a first organic light emitting diode, wherein the drive control module is connected with the drive circuit, the grid electrode of the first light emitting thin film transistor is connected with the light emitting control module, one of the source electrode or the drain electrode of the first light emitting thin film transistor is connected with the drive circuit, and the other one of the source electrode or the drain electrode of the first light emitting thin film transistor is connected with the first organic light emitting diode; the first light-emitting thin film transistor is connected with the light-emitting control module through a first wire, and the second light-emitting thin film transistor is connected with the light-emitting control module through a second wire; the organic light emitting diode display circuit further comprises an organic light emitting diode detector, one end of the organic light emitting diode detector is connected with the first organic light emitting diode or/and the second organic light emitting diode, the other end of the organic light emitting diode detector is connected with the light emitting control module, whether the first organic light emitting diode or/and the second organic light emitting diode is damaged or not is detected, and the result is fed back to the light emitting control module.
The organic light emitting diode display circuit also comprises a light detector which is used for detecting the external light intensity and is connected with the light control module, so that the light control module controls the working state of the first organic light emitting diode or/and the second organic light emitting diode according to the external light intensity.
Wherein the light detector is a photodiode.
The light detector is connected with the light emitting control module through an operational amplifier and a digital-to-analog converter, so that an optical signal detected by the light detector is converted into an electric signal and then sent to the light emitting control module.
The organic light emitting diode display circuit further comprises a counting circuit, one end of the counting circuit is connected with the first organic light emitting diode or the second organic light emitting diode, the other end of the counting circuit is connected with the light emitting control module, the counting circuit monitors the applied or non-applied voltage times of the anode of the first organic light emitting diode or the second organic light emitting diode, and when the applied voltage times reach a threshold value, the counting circuit feeds back the applied voltage times to the light emitting control module so as to switch the first organic light emitting diode and the second organic light emitting diode.
When the counting circuit monitors the number of times of voltage application of the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit adds one to count when detecting that the voltage at the anode of the first organic light emitting diode or the second organic light emitting diode is greater than or equal to 0.8 power supply voltage, and the counting is unchanged when the voltage is less than 0.8 power supply voltage; when the counting circuit monitors the number of times of non-voltage application of the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit adds one to count when detecting that the voltage at the anode of the first organic light emitting diode or the second organic light emitting diode is less than 0.8 of the supply voltage, and the counting is not changed when the voltage is greater than or equal to 0.8 of the supply voltage.
When the counting circuit monitors the number of times of voltage application of the anode of the first organic light emitting diode or the second organic light emitting diode, if the counting circuit detects that no voltage is applied to the anode of the first organic light emitting diode or the second organic light emitting diode, the counting is restarted; when the counting circuit monitors the number of times of the voltage not applied to the anode of the first organic light emitting diode or the second organic light emitting diode, if the counting circuit detects that the voltage is applied to the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit restarts counting.
The organic light emitting diode display circuit further comprises a timing circuit, the timing circuit is connected with the light emitting control module, and the light emitting control module changes level signals input to the first wiring and the second wiring once after preset time.
The driving circuit comprises a driving thin film transistor, a switching thin film transistor, a first initialization thin film transistor, a second initialization thin film transistor, a first capacitor and a second capacitor, wherein the grid electrode of the driving thin film transistor is connected with the nth scanning line, one of the source electrode or the drain electrode of the driving thin film transistor is connected with the data line, the other one of the source electrode or the drain electrode of the driving thin film transistor is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the grid electrode of the switching thin film transistor; one of a source electrode or a drain electrode of the switch thin film transistor is connected with a power supply, and the other one of the source electrode or the drain electrode of the switch thin film transistor is connected with a source electrode or a drain electrode of the first light-emitting thin film transistor and a source electrode or a drain electrode of the second light-emitting thin film transistor; the grid electrode of the first initialization thin film transistor is connected with the (n-1) th scanning line, one of the source electrode or the drain electrode of the first initialization thin film transistor is connected with the grid electrode of the switch thin film transistor, and the other one of the source electrode or the drain electrode of the first initialization thin film transistor is connected with one end of the switch thin film transistor; one end of the second initialization thin film transistor is connected with the (n-1) th scanning line, one of a source electrode or a drain electrode of the second initialization thin film transistor is connected with the initialization level, the other end of the second initialization thin film transistor is connected with one end of the driving thin film transistor, the driving thin film transistor is connected with the first capacitor and is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the power supply, wherein n is a natural number not less than 2.
In order to solve the above technical problem, the present application adopts another technical solution: the display device comprises a back plate and a display panel connected with the back plate, wherein the display panel comprises a substrate and an organic light emitting diode display circuit at least partially arranged on the substrate, and the organic light emitting diode display circuit is any one of the organic light emitting diode display circuits.
The beneficial effect of this application is: different from the prior art, the organic light emitting diode display circuit provided by the application has the advantages that each driving circuit drives two organic light emitting diodes, so that the number of the organic light emitting diodes corresponding to each pixel is two, the two organic light emitting diodes can be used alternately, the illumination time is prolonged, the service life of the pixels is longer, and the service life and the effect of the display device cannot be influenced by the damage of a single organic light emitting diode.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic circuit diagram of a first embodiment of an OLED display circuit according to the present application;
FIG. 2 is a circuit diagram of a second embodiment of an OLED display circuit according to the present application;
FIG. 3 is a circuit diagram of a third embodiment of an OLED display circuit according to the present application;
FIG. 4 is a circuit diagram of a fourth embodiment of an OLED display circuit of the present application;
FIG. 5 is a schematic cross-sectional view of an embodiment of a display device according to the present application.
11/21/31/41, a driving circuit, 12/22/32/42, a light emitting control module, 23, an organic light emitting diode detector, 34, a photodetector, 45, a counting circuit, date, a data line, scan, a scan line, T1, a driving thin film transistor, T2, a switching thin film transistor, T3, a first initializing thin film transistor, T4, a second initializing thin film transistor, T5, a first light emitting thin film transistor, T6, a second light emitting thin film transistor, C1, a first capacitor, C2, a second capacitor, L1, a first organic light emitting diode, L2, a second organic light emitting diode, V1, a power supply.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present application clearer, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" typically includes at least two, but does not exclude the presence of at least one.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that the terms "comprises," "comprising," or any other variation thereof, as used herein, 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 phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention of the application lies in: the two organic light emitting diodes are controlled to emit light simultaneously or alternately by matching one driving circuit with the light emitting control module, so that the service life of the organic light emitting diode display circuit is prolonged.
Referring to fig. 1, in which fig. 1 is a circuit diagram of an organic light emitting diode display circuit according to a first embodiment of the present disclosure. In the present embodiment, the organic light emitting diode display circuit includes a light emitting control module 12, a driving control module (not shown), a driving circuit 11, a first light emitting thin film transistor T5, a first organic light emitting diode L1, a second light emitting thin film transistor T6, and a second organic light emitting diode L2.
The driving control module is connected with the driving circuit 11, the grid electrode of the first light-emitting thin film transistor T5 is connected with the light-emitting control module 12, one of the source electrode or the drain electrode of the first light-emitting thin film transistor T5 is connected with the driving circuit 11, and the other one is connected with the first organic light-emitting diode L1. The gate of the second thin film transistor is connected to the light emitting control module 12, one of the source or the drain of the second thin film transistor is connected to the driving circuit 11, and the other is connected to the second organic light emitting diode L2, so that the first organic light emitting diode L1 and the second organic light emitting diode L2 can be connected to the same driving circuit 11. Preferably, the first light emitting thin film transistor T5 is connected to the light emitting control module 12 through a first wire, and the second light emitting thin film transistor T6 is connected to the light emitting control module 12 through a second wire.
It can be seen that whether the first organic light emitting diode L1 and the second organic light emitting diode L2 conduct the driving circuit 11 is controlled by the light emitting control module 12, that is, one driving circuit 11 can conduct both organic light emitting diodes. One driving circuit 11 is matched with one pixel, so that two organic light emitting diodes can be matched for one pixel by using the organic light emitting diode display circuit, and the first organic light emitting diode L1 and the second organic light emitting diode L2 are controlled by the light emitting control module 12 and can emit light in turn, so that the service life of each organic light emitting diode is prolonged; and the light can be emitted simultaneously, so that the display brightness is enhanced.
In the present embodiment, the driving circuit 11 includes a driving thin film transistor T1, a switching thin film transistor T2, a first initializing thin film transistor T3, a second initializing thin film transistor T4, a first capacitor, and a second capacitor. The gate of the driving thin film transistor T1 is connected to the nth scan line scan, one of the source or the drain of the driving thin film transistor T1 is connected to the data line date, the other is connected to one end of the first capacitor, and the other end of the first capacitor is connected to the gate of the switching thin film transistor T2. One of the source or drain of the switching thin film transistor T2 is connected to the power supply V1, and the other is connected to the source or drain of the first light emitting thin film transistor T5 and the second light emitting thin film transistor T6. The gate of the first initializing thin film transistor T3 is connected to the (n-1) th scan line scan, one of the source or the drain of the first initializing thin film transistor T3 is connected to the gate of the switching thin film transistor T2, and the other is connected to one end of the switching thin film transistor T2 connected to one end of the first light emitting thin film transistor T5. One end of the second initialization thin film transistor T4 is connected to the (n-1) th scan line scan, one of a source or a drain of the second initialization thin film transistor T4 is connected to an initialization level, the other is connected to one end of the driving thin film transistor T1 connected to the first capacitor and to one end of the second capacitor, and the other end of the second capacitor is connected to the power supply V1. Wherein n is a natural number not less than 2. The scan lines scan and the data lines date are both connected with the driving control module and transmit signals sent by the driving control module. The driving control module and the light emitting control module 12 may be a circuit board integrated with a chip, or other driving control module and light emitting control module 12 in the prior art.
It should be noted that the first light emitting thin film transistor T5 is used for turning on or off the switching thin film transistor T2 and the first organic light emitting diode L1, and the second light emitting thin film transistor T6 is used for turning on or off the switching thin film transistor T2 and the second organic light emitting diode L2. The driving circuit 11 may also be other common pixel driving circuits 11, and this embodiment takes only one of the common pixel driving circuits 11 as an example for explanation, and a person skilled in the art may completely use other pixel driving circuits 11 to replace the driving circuit 11 in this embodiment, and only needs to ensure that one driving circuit 11 is connected to two organic light emitting diodes through two thin film transistors. Also, the first light emitting thin film transistor T5 is connected to the anode of the first organic light emitting diode L1, and the second light emitting thin film transistor T6 is connected to the anode of the second organic light emitting diode L2. The cathodes of the first and second organic light emitting diodes L1 and L2 may be connected together and then grounded or connected to a predetermined level, or the cathodes of the first and second organic light emitting diodes L1 and L2 may be grounded or connected to a predetermined level, respectively.
In operation, the method is divided into a plurality of stages.
In the first stage, according to the difference between signals on the nth signal line and the (n-1) th signal line, the switching thin film transistor T2, the first initialization thin film transistor T3 and the second initialization thin film transistor T4 are turned on, so that the initialization level and the first capacitor are turned on, the first capacitor is charged, and the switching thin film transistor T2 is initialized.
In the second stage, the signals on the nth signal line and the (n-1) th signal line are inverted, the switching thin film transistor T2, the first initializing thin film transistor T3 and the second initializing thin film transistor T4 are turned off, the driving thin film transistor T1 is turned on, the first capacitor and the data line date are turned on, and at this time, the voltage at one end of the first capacitor connected with the driving thin film transistor T1 is the data line date voltage.
In the third stage, the signals on the nth signal line and the (n-1) th signal line are the same, the driving thin film transistor T1, the first initializing thin film transistor T3 and the second initializing thin film transistor T4 are turned off, the switching thin film transistor T2 is turned on by discharging through the first capacitor, and the on state is controlled by the data line data voltage in the previous stage. The first light emitting thin film transistor T5 and the second light emitting thin film transistor T6 are turned on or kept off according to the electrical signal sent by the light emitting control module 12 through the first wire and the second wire, so that the first organic light emitting diode L1 or/and the second organic light emitting diode L2 are turned on with the power supply V1, thereby emitting light. In practical operation, the first organic light emitting diode L1 may be switched to the second organic light emitting diode L2 to emit light after emitting light for several times, and the second organic light emitting diode L2 may be switched to the first organic light emitting diode L1 to emit light after emitting light for several times, so as to prolong the lifetime of the whole organic light emitting diode display circuit. It is also possible to detect whether the first organic light emitting diode L1 is damaged, and if the first organic light emitting diode L1 is damaged, switch to the second organic light emitting diode L2 to emit light. The service life of the organic light emitting diode display circuit can be prolonged by about one time in the mode, and the effect is obvious. In addition, under the condition that some ambient light is bright, the first organic light emitting diode L1 and the second organic light emitting diode L2 can also emit light together to enhance the intensity of the displayed light, so that the display effect is not influenced by the brightness of the ambient light.
Through the mode, according to the organic light emitting diode display circuit provided by the application, each driving circuit 11 drives the two organic light emitting diodes L1 and L2, so that the number of the organic light emitting diodes L1 and L2 corresponding to each pixel is two, and the two organic light emitting diodes L1 and L2 can be used alternately, so that the illumination time is prolonged, the service life of the pixels can be prolonged, and the service life and the effect of a display device cannot be influenced due to the damage of a single organic light emitting diode.
Referring to fig. 2, fig. 2 is a circuit diagram of a second embodiment of an organic light emitting diode display circuit according to the present application. In the present embodiment, the organic light emitting diode display circuit includes a light emission control module 22, a driving control module, a driving circuit 21, a first light emitting thin film transistor T5, a first organic light emitting diode L1, a second light emitting thin film transistor T6, and a second organic light emitting diode L2, and further includes an organic light emitting diode detector 23.
Unlike the previous embodiment, an organic light emitting diode detector 23 is added in the present embodiment. The organic light emitting diode detector 23 has one end connected to the first organic light emitting diode L1 and the second organic light emitting diode L2, and the other end connected to the light emitting control module 22. The organic light emitting diode detector 23 detects whether the first organic light emitting diode L1 or/and the second organic light emitting diode L2 is damaged or not, and feeds back the result to the light emitting control module 22. In this embodiment, the organic light emitting diode detector 23 is disposed for both the first organic light emitting diode L1 and the second organic light emitting diode L2, and such an arrangement is suitable for the situation that the first organic light emitting diode L1 and the second organic light emitting diode L2 emit light in turn, so that when one of the first organic light emitting diode L1 or the second organic light emitting diode L2 is damaged, the damaged one needs to be fed back to the light emitting control module 22, so that the light emitting control module 22 only sends a control signal for the first light emitting thin film transistor T5 or the second light emitting thin film transistor T6, and the undamaged one of the first organic light emitting diode L1 or the second organic light emitting diode L2 is used to emit light.
The organic light emitting diode detector 23 in this embodiment may be replaced with a detector capable of detecting the operating conditions of two organic light emitting diodes simultaneously, or the organic light emitting diode detector 23 is only configured for the first organic light emitting diode L1, when the organic light emitting diode display circuit operates, only the first organic light emitting diode L1 is initially used for emitting light, and when the organic light emitting diode detector 23 detects that the first organic light emitting diode L1 is damaged, the second organic light emitting diode L2 is used for emitting light.
In this embodiment, the organic light emitting diode detector 23 is added to detect the damage of the first organic light emitting diode L1 and the falling organic light emitting diode, so that when the first organic light emitting diode L1 or the second organic light emitting diode L2 is damaged, the light emitting unit is replaced in time, and the organic light emitting diode which is not damaged is used to emit light, so that the normal operation of the organic light emitting diode display circuit is not affected, and normal light emission can be continuously realized, thereby prolonging the service life of the organic light emitting diode display circuit.
Referring to fig. 3, fig. 3 is a circuit diagram of a third embodiment of an organic light emitting diode display circuit according to the present invention. In the present embodiment, the organic light emitting diode display circuit includes a light emission control module 32, a driving control module, a driving circuit 31, a first light emitting thin film transistor T5, a first organic light emitting diode L1, a second light emitting thin film transistor T6, and a second organic light emitting diode L2, and further includes a photodetector 34. The photodetector 34 is used for detecting the intensity of the external light and is connected to the light control module 32, so that the light control module 32 controls the operating state of the first organic light emitting diode L1 or/and the second organic light emitting diode L2 according to the intensity of the external light. For example, when the light detector 34 detects that the intensity of the external light is small, the light control module 32 sends a signal indicating that the intensity of the external light is small, and the light control module 32 controls one of the first organic light emitting diode L1 and the second organic light emitting diode L2 to emit light. When the light detector 34 detects that the intensity of the external light is larger, it sends a signal indicating that the intensity of the external light is larger to the light-emitting control module 32, and the light-emitting control module 32 can control the second organic light-emitting diode L2 and the second organic light-emitting diode L2 to emit light together.
Preferably, the light detector 34 is a photodiode. The photodiode is a semiconductor device composed of a PN junction, and has a unidirectional conductive characteristic. The photodiode is operated under the action of reverse voltage, and under the irradiation of light with general illumination, the generated current is called photocurrent. If a load is connected to an external circuit, an electric signal is obtained from the load, then the electric signal is subjected to operational amplification, the amplified electric signal is an analog signal, analog-to-digital conversion is also carried out, and the external light intensity 'bright' and 'dark' detected by the photodiode are converted into digital signals '1' and '0' through a certain judgment threshold. Therefore, the light detector 34 is connected to the light emission control module 32 through an operational amplifier and a digital-to-analog converter, so that the light signal detected by the light detector 34 is converted into an electrical signal and then transmitted to the light emission control module 32.
In other embodiments, a timing control circuit may be added, and the light detector 34 is connected to the timing control circuit through an operational amplifier and a digital-to-analog converter, and then the timing control circuit sends information to the light emitting control module 32. In addition, the timing control circuit may be integrated into the light emitting control circuit, and the transmission amplifier and the digital-to-analog converter may also be integrated into the light emitting control module 32.
In other embodiments, the light detector 34 may also be replaced by a timing circuit, the timing circuit is connected to the light emission control module 32, and the light emission control module 32 changes the level signals input to the first wire and the second wire once every predetermined time elapses, so as to realize the alternate light emission of the first organic light emitting diode L1 and the second organic light emitting diode L2.
Referring to fig. 4, fig. 4 is a circuit diagram of a fourth embodiment of an oled display circuit according to the present application. In the present embodiment, the organic light emitting diode display circuit includes a light emitting control module 42, a driving control module, a driving circuit 41, a first light emitting thin film transistor T5, a first organic light emitting diode L1, a second light emitting thin film transistor T6, and a second organic light emitting diode L2, and further includes a counting circuit 45. One end of the counting circuit 45 is connected to the anode of the first organic light emitting diode L1, and the other end is connected to the light emission control module 42, and the counting circuit 45 monitors the number of times of applying or not applying voltage to the anode of the first organic light emitting diode L1, and feeds back the number of times of applying voltage to the light emission control module 42 when the number of times of applying voltage reaches a threshold value, so as to switch between the first organic light emitting diode L1 and the second organic light emitting diode L2. During sampling, the counting circuit 45 pulls a feedback signal through the anode of the first organic light emitting diode L1, then analog-to-digital conversion is carried out, the decision threshold is 0.8 × power supply voltage, when the voltage is greater than or equal to 0.8 × power supply voltage, a signal "1" is output, counting is carried out once when the number of times of voltage application is counted, and counting is not carried out when the number of times of voltage non-application is counted; if the voltage is less than the preset value, a signal 0 is output, counting is not carried out when the number of times of voltage application is counted, and counting is carried out once when the number of times of voltage non-application is counted. When receiving the signal 1, the counting circuit 45 starts counting until the count reaches the decision threshold 20 times, and then the light emission control module 42 switches the organic light emitting diode display. Or, when counting the number of times of voltage application, when receiving the signal "0", the counting circuit 45 resets and starts counting from 0 again; when the signal "1" is received while counting the number of times of non-application of voltage, the counter circuit 45 is reset and starts counting from 0 again. The counting circuit 45 may also be a timer or other counting device commonly used in display devices. The supply voltage may also be referred to as supply voltage.
In addition, in other embodiments, the counting circuit 45 may be connected to the anode of the second organic light emitting diode L2, and the same effect may be achieved.
That is, when the counting circuit 45 monitors the number of times of the voltage application of the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2, the counting circuit 45 adds one when detecting that the voltage at the anode of the first organic light emitting diode L2 is greater than or equal to 0.8 supply voltage, and the count is unchanged when the voltage is less than 0.8 supply voltage; when the counting circuit 45 monitors the number of times of the non-applied voltage of the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2, the counting circuit 45 adds one to the count when detecting that the voltage at the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2 is less than 0.8 supply voltage, and the count is not changed when the count is greater than or equal to 0.8 supply voltage. When monitoring the number of times of voltage application to the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2, the counting circuit 45 restarts counting if it detects that no voltage is applied to the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2; the counting circuit 45 restarts counting when detecting that the voltage is applied to the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2 while monitoring the number of times the voltage is not applied to the anode of the first organic light emitting diode L1 or the second organic light emitting diode L2.
The above embodiments can be combined with each other, for example, the second embodiment and the third embodiment can be combined, so that not only the alternate light emission of the organic light emitting diode can be realized, but also stronger adaptability to the ambient light can be realized. There are other combinations and combinations with different prior art techniques, which are not described in detail herein.
In this way, according to the organic light emitting diode display circuit provided by the application, each driving circuit drives two organic light emitting diodes, so that the number of the organic light emitting diodes corresponding to each pixel is two, the two organic light emitting diodes can be used alternately, the illumination time is prolonged, the service life of the pixel is longer, and the service life and the effect of the display device cannot be influenced by the damage of a single organic light emitting diode.
Referring to fig. 5, fig. 5 is a schematic cross-sectional structure diagram of an embodiment of a display device according to the present application. The display device includes a back plate 51 and a display panel 52 connected to the back plate 51. The display panel 52 includes a substrate 521 and an oled display circuit 522 at least partially disposed on the substrate 521, wherein the oled display circuit 522 is any one of the above-mentioned oled display circuits. Each of the driving circuit, the first light-emitting thin film transistor, the first organic light-emitting diode, the second light-emitting thin film transistor and the second organic light-emitting diode corresponds to one pixel, so that the two organic light-emitting diodes jointly realize the light emission of one pixel.
Through the mode, according to the display device provided by the application, each driving circuit drives the two organic light emitting diodes, so that the number of the organic light emitting diodes corresponding to each pixel is two, the two organic light emitting diodes can be used alternately, the illumination time is prolonged, the service life of the pixel is longer, and the service life and the effect of the display device cannot be influenced due to the damage of the single organic light emitting diode.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. An organic light emitting diode display circuit comprises a light emitting control module, a drive circuit, a first light emitting thin film transistor and a first organic light emitting diode, wherein the drive control module is connected with the drive circuit, the grid electrode of the first light emitting thin film transistor is connected with the light emitting control module, and the first light emitting thin film transistorOne of the source electrode or the drain electrode is connected with the driving circuit, and the other is connected with the first organic light emitting diode, the organic light emitting diode display circuit further comprises a second light emitting thin film transistor and a second organic light emitting diode, the grid electrode of the second thin film transistor is connected with the light emitting control module, one of the source electrode or the drain electrode of the second thin film transistor is connected with the driving circuit, and the other is connected with the second organic light emitting diode, so that the first organic light emitting diode and the second organic light emitting diode can be connected with the same driving circuit ；
The first light-emitting thin film transistor is connected with the light-emitting control module through a first wire, and the second light-emitting thin film transistor is connected with the light-emitting control module through a second wire;
the organic light emitting diode display circuit further comprises an organic light emitting diode detector, one end of the organic light emitting diode detector is connected with the first organic light emitting diode or/and the second organic light emitting diode, the other end of the organic light emitting diode detector is connected with the light emitting control module, whether the first organic light emitting diode or/and the second organic light emitting diode is damaged or not is detected, and the result is fed back to the light emitting control module.
2. The OLED display circuit of claim 1,
the organic light emitting diode display circuit further comprises a light detector for detecting external light intensity and is connected with the light emitting control module, so that the light emitting control module controls the working state of the first organic light emitting diode or/and the second organic light emitting diode according to the external light intensity.
3. The OLED display circuit of claim 2,
the light detector is a photodiode.
4. The OLED display circuit of claim 2,
the light detector is connected with the light emitting control module through an operational amplifier and a digital-to-analog converter, so that an optical signal detected by the light detector is converted into an electric signal and then sent to the light emitting control module.
5. The OLED display circuit of claim 1,
the organic light emitting diode display circuit further comprises a counting circuit, one end of the counting circuit is connected with the first organic light emitting diode or the second organic light emitting diode, the other end of the counting circuit is connected with the light emitting control module, the counting circuit monitors the number of times of voltage application or non-voltage application of the anode of the first organic light emitting diode or the second organic light emitting diode, and when the number of times of voltage application reaches a threshold value, the counting circuit feeds back the number of times of voltage application to the light emitting control module so as to switch the first organic light emitting diode and the second organic light emitting diode.
6. The OLED display circuit of claim 5,
when the counting circuit monitors the number of times of voltage application of the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit counts one when detecting that the voltage at the anode of the first organic light emitting diode or the second organic light emitting diode is greater than or equal to 0.8 supply voltage, and counts unchanged when the voltage is less than 0.8 supply voltage;
when the counting circuit monitors the number of times of the voltage not applied to the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit adds one to the count when detecting that the voltage at the anode of the first organic light emitting diode or the second organic light emitting diode is less than 0.8 supply voltage, and the count is not changed when the voltage is greater than or equal to 0.8 supply voltage.
7. The OLED display circuit of claim 5,
when the counting circuit monitors the number of times of voltage application of the anode of the first organic light emitting diode or the second organic light emitting diode, if the counting circuit detects that no voltage is applied to the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit restarts counting;
when the counting circuit monitors the number of times of voltage not applied to the anode of the first organic light emitting diode or the second organic light emitting diode, if the counting circuit detects that the voltage is applied to the anode of the first organic light emitting diode or the second organic light emitting diode, the counting circuit restarts counting.
8. The OLED display circuit of claim 1,
the organic light emitting diode display circuit further comprises a timing circuit, the timing circuit is connected with the light emitting control module, and the light emitting control module changes level signals once input to the first wiring and the second wiring every time preset time passes.
9. The OLED display circuit of claim 1,
the driving circuit comprises a driving thin film transistor, a switching thin film transistor, a first initialization thin film transistor, a second initialization thin film transistor, a first capacitor and a second capacitor, wherein the grid electrode of the driving thin film transistor is connected with the nth scanning line, one of the source electrode or the drain electrode of the driving thin film transistor is connected with a data line, the other one of the source electrode or the drain electrode of the driving thin film transistor is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the grid electrode of the switching thin film transistor; one of a source electrode or a drain electrode of the switch thin film transistor is connected with a power supply, and the other one of the source electrode or the drain electrode of the switch thin film transistor is connected with the source electrodes or the drain electrodes of the first light-emitting thin film transistor and the second light-emitting thin film transistor; the grid electrode of the first initialization thin film transistor is connected with the (n-1) th scanning line, one of the source electrode or the drain electrode of the first initialization thin film transistor is connected with the grid electrode of the switch thin film transistor, and the other one of the source electrode or the drain electrode of the first initialization thin film transistor is connected with the switch thin film transistor and is connected with one end of the first light-emitting thin film transistor; one end of the second initialization thin film transistor is connected with the (n-1) th scanning line, one of a source electrode or a drain electrode of the second initialization thin film transistor is connected with an initialization level, the other end of the second initialization thin film transistor is connected with one end of the first capacitor and one end of the second capacitor, and the other end of the second capacitor is connected with a power supply, wherein n is a natural number not less than 2.
10. A display device, comprising a back plate and a display panel connected to the back plate, wherein the display panel comprises a substrate and an organic light emitting diode display circuit at least partially disposed on the substrate, and the organic light emitting diode display circuit is the organic light emitting diode display circuit according to any one of claims 1 to 9.
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| CN202211430175.7A CN115762401B (en) | 2022-11-14 | 2022-11-14 | Organic light emitting diode display circuit and display device |
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| CN202211430175.7A CN115762401B (en) | 2022-11-14 | 2022-11-14 | Organic light emitting diode display circuit and display device |
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