CN111933078A - Organic light emitting diode driving circuit and display panel - Google Patents
Organic light emitting diode driving circuit and display panel Download PDFInfo
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- CN111933078A CN111933078A CN202010831721.2A CN202010831721A CN111933078A CN 111933078 A CN111933078 A CN 111933078A CN 202010831721 A CN202010831721 A CN 202010831721A CN 111933078 A CN111933078 A CN 111933078A
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- 238000005096 rolling process Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 229920001621 AMOLED Polymers 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
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- 230000008878 coupling Effects 0.000 description 1
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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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a driving circuit of an organic light emitting diode and a display panel, wherein the anode and the cathode of the organic light emitting diode are respectively and electrically connected with a first power supply and a second power supply, the voltage of the first power supply is higher than that of the second power supply, the light emitting display of the organic light emitting diode is realized by utilizing the first power supply and the second power supply, noise waves in an output voltage signal of the first power supply are eliminated by arranging a compensation module, the light emitting consistency of the organic light emitting diode is improved, and the display effect of the display panel is improved.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a driving circuit of an organic light emitting diode and a display panel.
Background
In the current display module, the Oncell structure is the mainstream of the current display module, that is, the touch metal is directly disposed on the display screen body to realize the touch function of the module. However, the mutual interference problem between the driving signal displayed by the screen body and the touch scanning signal is easily caused by the film layer structure, that is, the touch scanning signal affects the display of the screen body, resulting in noise generated in the driving signal, and thus the rolling water ripple occurs, that is, the water ripple occurs at the position of the touch scanning signal, resulting in the problem of poor display.
Disclosure of Invention
In view of the above, embodiments of the present invention are directed to a driving circuit of an organic light emitting diode and a display panel, in which an anode and a cathode of the organic light emitting diode are electrically connected to a first power source and a second power source, respectively, a voltage of the first power source is higher than a voltage of the second power source, light emitting display of the organic light emitting diode is achieved by the first power source and the second power source, and noise in an output voltage of the first power source is eliminated by providing a compensation module, so as to improve light emitting uniformity of the organic light emitting diode, and solve the problem of rolling water ripple, thereby improving display effect of the display panel.
According to an aspect of the present invention, an embodiment of the present invention provides a driving circuit for an organic light emitting diode, including: a first power supply electrically connected to an anode of the organic light emitting diode; a second power supply electrically connected to a cathode of the organic light emitting diode; wherein a voltage of the first power supply is higher than a voltage of the second power supply; and the compensation module is used for compensating the output voltage of the first power supply and eliminating clutter in the output voltage of the first power supply.
In an embodiment, the compensation module includes a canceller to cancel a first spur in an output voltage of the first power supply.
In one embodiment, the amplitude canceller includes a sampler for collecting a voltage signal of the first power supply and an inverter for generating a compensation signal in phase opposition to the first spur in the voltage signal of the first power supply.
In one embodiment, the amplitude of the compensation signal is equal to the amplitude of the first spur.
In one embodiment, the sampling frequency of the sampler comprises 100 times per frame.
In an embodiment, the compensation module includes a suppressor for canceling a second spur in the output voltage of the first power supply.
In one embodiment, the suppressor is disposed between the first power source and the organic light emitting diode.
In an embodiment, the suppressor comprises an RC filter circuit.
According to another aspect of the present invention, a display panel is provided according to an embodiment of the present invention, which includes the driving circuit of the organic light emitting diode described in any one of the above.
According to the driving circuit and the display panel of the organic light emitting diode provided by the embodiment of the invention, the anode and the cathode of the organic light emitting diode are respectively and electrically connected with the first power supply and the second power supply, wherein the voltage of the first power supply is higher than that of the second power supply, the light emitting display of the organic light emitting diode is realized by utilizing the first power supply and the second power supply, the noise wave in the output voltage of the first power supply is eliminated by arranging the compensation module, the light emitting consistency of the organic light emitting diode is improved, the problem of rolling water ripple is solved, and the display effect of the display panel is improved.
Drawings
Fig. 1 is a schematic diagram illustrating a result of a driving circuit of an organic light emitting diode according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram illustrating a result of a driving circuit of an organic light emitting diode according to another embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating a result of a driving circuit of an organic light emitting diode according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Further, in the exemplary embodiments, since the same reference numerals denote the same components having the same structure or the same steps of the same method, if an embodiment is exemplarily described, only a structure or a method different from the already described embodiment is described in other exemplary embodiments.
Throughout the specification and claims, when one element is described as being "connected" to another element, the one element may be "directly connected" to the other element or "electrically connected" to the other element through a third element. Furthermore, unless explicitly described to the contrary, the term "comprising" and its corresponding terms should only be taken as including the stated features, but should not be taken as excluding any other features.
Fig. 1 is a schematic diagram illustrating a result of a driving circuit of an organic light emitting diode according to an embodiment of the present disclosure. As shown in fig. 1, the driving circuit includes: the compensation module is arranged at one end of the anode of the organic light-emitting diode and used for compensating the output voltage of the first power supply VDD so as to eliminate noise waves in the output voltage of the first power supply VDD; the voltage of the first power supply VDD is higher than the voltage VSS of the second power supply. The organic light emitting diode emits light under voltage driving, and when the organic light emitting diode needs to be started, a voltage difference is formed between the anode voltage and the cathode voltage, namely a voltage difference exists between the first power supply VDD and the second power supply VSS, and the organic light emitting diode is lightened by utilizing the voltage difference. However, in display panels such as an Active-matrix organic light-emitting diode (AMOLED), especially in a scheme (an Oncell scheme) in which a touch screen is embedded between a color filter substrate and a polarizer of the display screen, since coupling may occur between a scan signal of the touch screen and a driving voltage signal between display screen bodies, when the scan signal of the touch screen is scanned from top to bottom, the driving voltage of the display screen body at a corresponding position may be unstable, that is, the first power supply VDD may be unstable, so that rolling water ripples from top to bottom may be seen on the display screen body. In order to eliminate rolling water ripples, the embodiment of the application sets up the compensation module at the anode terminal of the organic light emitting diode, utilize the compensation module to eliminate the clutter in the output voltage of the first power supply VDD, namely compensate from the source of the driving circuit, in order to avoid the interference of the clutter in the voltage signal of the first power supply VDD to other subsequent circuits, improve the stability of the voltage at the anode terminal of the organic light emitting diode, thereby avoid generating rolling water ripples, and reduce the interference of the clutter signal to the driving voltage signal of the organic light emitting diode from the display terminal, namely reduce the interference of the clutter signal to the display effect of the organic light emitting diode, only change the structure and the design of the display terminal, do not change the structure of touch control, thereby avoid influencing the touch control function.
According to the driving circuit of the organic light emitting diode provided by the embodiment of the invention, the anode and the cathode of the organic light emitting diode are respectively and electrically connected with the first power supply and the second power supply, wherein the voltage of the first power supply is higher than that of the second power supply, the light emitting display of the organic light emitting diode is realized by using the first power supply and the second power supply, and the noise wave in the output voltage signal of the first power supply is eliminated by arranging the compensation module, so that the light emitting consistency of the organic light emitting diode is improved, the problem of rolling water ripple is solved, and the display effect of the display panel is improved.
Fig. 2 is a schematic diagram illustrating a result of a driving circuit of an organic light emitting diode according to another embodiment of the present disclosure. As shown in fig. 2, the compensation module may include a clipper for canceling a first spur in the output voltage of the first power supply VDD. Through setting up the ware that disappears, eliminate the first clutter of existence in the voltage signal of first power VDD, wherein first clutter mainly is the great clutter of amplitude to avoid the first clutter of large amplitude to cause the unstable obvious ripple that brings of amplitude of the voltage signal of first power VDD.
In one embodiment, as shown in fig. 2, the amplitude canceller may include a sampler for collecting the voltage signal of the first power supply VDD and an inverter for generating the compensation signal in phase opposition to the first spur of large amplitude in the voltage signal of the first power supply VDD. The sampler is used for collecting the voltage signal of the first power supply VDD and capturing the clutter signal from the voltage signal of the first power supply VDD, and the specific way of capturing the clutter signal from the voltage signal of the first power supply VDD may be: respectively collecting a voltage signal (namely a voltage signal which is not interfered by a touch scanning signal) at a first power supply VDD end and a voltage signal (namely a voltage signal which is interfered by the touch scanning signal) at an organic light emitting diode anode end, and then obtaining a clutter signal according to the voltage signal at the first power supply VDD end and the voltage signal at the organic light emitting diode anode end. It should be understood that different methods for capturing clutter signals may be selected according to requirements of an actual application scenario in the embodiments of the present application, as long as the selected capturing method can accurately capture clutter signals, and the specific method for capturing clutter signals is not limited in the embodiments of the present application. Since the clutter signal generally has periodicity, the voltage signal of the first power supply VDD in one period may be collected, and the clutter signal is captured from the voltage signal of the first power supply VDD in the one period and transmitted to the inverter, the inverter generates a periodic compensation signal having a phase opposite to that of the clutter signal according to the clutter signal, and outputs the compensation signal to the first power supply VDD or the anode terminal of the organic light emitting diode, so that the first clutter with a large amplitude in the voltage signal of the first power supply VDD and the compensation signal are superimposed and cancelled, thereby eliminating the first clutter with a large amplitude in the voltage signal of the first power supply VDD. It should be understood that the sampler and the inverter in the embodiment of the present application may be two independent circuits, or may be two parts in one circuit, as long as the sampler and the inverter can achieve the capturing of the spurious signal in the voltage signal of the first power supply VDD and the generation of the compensation signal, and the embodiment of the present application is not limited to the specific circuit structure of the sampler and the inverter. It should also be understood that the sampler in the embodiment of the present application can store the waveform of the collected clutter signal, perform fixed compensation on the clutter signal, and also can collect the clutter signal in real time, namely, compensate after collecting the clutter signal in real time in the process of driving display, certainly, the real-time collection of the clutter signal has higher requirements on the processing speed of the sampler and the inverter, and because the clutter signal is generally stable in a certain time, therefore, the sampler can also sample according to a certain sampling time period, and the embodiment of the present application does not limit the specific sampling period of the sampler. In a further embodiment, the amplitude of the compensation signal may be equal to the amplitude of the large amplitude first spur. In order to completely cancel the first noise having a large amplitude in the voltage signal of the first power supply VDD, the amplitude of the compensation signal may be set to be equal to the amplitude of the position corresponding to the first noise, so that the first noise having a large amplitude in the voltage signal of the first power supply VDD may be completely cancelled. It should be understood that the amplitude value of the compensation signal may be selected according to the requirement of the practical application scenario, for example, the difference between the amplitude value of the compensation signal and the amplitude value of the first spur with large amplitude in the corresponding voltage signal of the first power supply VDD may be set to be smaller than a preset value (e.g., 0.1V), so that the first spur with large amplitude in the voltage signal of the first power supply VDD may be filtered to be a spur with smaller amplitude, and then the filtering of the spur with smaller amplitude may be implemented by a circuit such as a filter, so long as the selected amplitude value of the compensation signal can satisfy the filtering for eliminating the first spur in the voltage signal of the first power supply VDD, which is not limited by the embodiment of the present application.
In an embodiment, the sampling frequency of the sampler may comprise 100 times per frame. The sampling frequency of the sampler can be set according to the scanning frequency of the touch scanning signal or the refreshing frequency of the display screen body, so that the occurrence of rolling water ripples which can be perceived by human eyes is avoided. It should be understood that the sampling frequency of the sampler may be selected according to the requirement of the actual application scenario, for example, the sampling frequency may be determined according to the scanning frequency of the touch scan signal, so as to avoid the situation that the rolling ripple cannot be completely eliminated by the unnecessary high sampling frequency and the unnecessary low sampling frequency, and for example, the sampling frequency of the sampler may be set according to the refresh frequency of the display screen body, so as to avoid the rolling ripple that is perceptible to human eyes due to the unnecessary high sampling frequency and the unnecessary low sampling frequency, as long as the sampling frequency of the sampler that is selected can satisfy the filtering for eliminating the large amplitude clutter in the voltage signal of the first power supply VDD, and the specific sampling frequency of the sampler is not limited in the embodiment of the present application.
In one embodiment, the amplitude eliminator can be arranged on the driving IC. The amplitude eliminator is arranged on the drive IC, namely a voltage detection point of the first power supply VDD is arranged at the drive IC, and the voltage detection point is used for detecting and compensating the voltage signal of the first power supply VDD in real time, so that the voltage signal output to the anode of the organic light-emitting diode is ensured to be a stable voltage signal, namely, the stable voltage difference between the first power supply VDD and the second power supply VSS is realized, the stable driving of the organic light-emitting diode is ensured, the interference of a touch scanning signal on the display driving voltage is eliminated, the display effect is improved, the noise waves are eliminated through the external amplitude eliminator, the flexibility is higher, the flexible compensation can be carried out according to different modules, and the adaptability of the compensation module is improved. It should be understood that, in the embodiment of the present application, the setting position of the amplitude canceller may be selected according to a requirement of an actual application scenario, as long as the selected setting position can meet a filtering requirement for eliminating a first clutter with a large amplitude in a voltage signal of the first power supply VDD, and the specific setting position of the amplitude canceller is not limited in the embodiment of the present application.
Fig. 3 is a schematic diagram illustrating a result of a driving circuit of an organic light emitting diode according to another embodiment of the present disclosure. As shown in fig. 3, the driving circuit of the organic light emitting diode may further include a suppressor for removing a small-amplitude second noise in the output voltage of the first power supply VDD. By providing the suppressor, the second noise of small amplitude in the output voltage of the first power supply VDD can be eliminated. In a further embodiment, a suppressor may be disposed between the first power supply VDD and the organic light emitting diode, and small amplitude noise in the voltage signal of the first power supply VDD may be eliminated by the suppressor disposed between the first power supply VDD and the organic light emitting diode.
Specifically, the suppressor may include a filter circuit such as an RC filter circuit. A first-order RC filter circuit, i.e. a capacitor and a resistor arranged in parallel, is connected in series in the pixel circuit, wherein the capacitance value of the capacitor and the resistance value of the resistor can be determined according to the input voltage value U of the suppressori(i.e., the voltage value at point a in fig. 3) and an output voltage value Uo(i.e., the voltage value at point B in fig. 3). Due to the fact that
From kirchhoff's voltage law, one can derive:
amplitude value:
when f is very small, a (f) is 1, the signal can pass, and when f is very large, a (f) is 0, the signal cannot pass, and the frequency of the noise wave is much greater than the frequency of the voltage signal of the first power supply VDD, so that by setting a capacitance value and a resistance value, that is, setting a cut-off frequency, the voltage signal of the first power supply VDD is less than the cut-off frequency, the noise wave can pass through the RC filter circuit, and when the frequency of the noise wave signal is greater than the cut-off frequency, the noise wave in the voltage signal of the first power supply VDD cannot pass through the RC filter circuit, and the RC filter circuits with different capacitance values and resistance values are simulated by simulation software (e.g., EWB, Multisim, etc.) to select appropriate capacitance values and resistance values. It should be understood that the specific structure of the suppressor may be selected according to the requirements of the practical application scenario, as long as the selected structure of the suppressor can achieve elimination of the small-amplitude noise in the voltage signal of the first power supply VDD, and the specific structure of the suppressor is not limited in the embodiments of the present application.
In an embodiment, as shown in fig. 3, the output terminal of the amplitude canceller in the above embodiments may be electrically connected to the input terminal of the suppressor (i.e. point a in fig. 3), that is, the voltage signal of the first power supply VDD is eliminated by the first noise with large amplitude, and then the small-amplitude noise is eliminated by the suppressor, since the small-amplitude noise may be generated when the first noise with large amplitude is eliminated, the amplitude canceller may be arranged before the suppressor in order to eliminate the noise signal in the voltage signal of the first power supply VDD more effectively, it should be understood that the embodiments of the present application may set the relative positions of the amplitude canceller and the suppressor according to the requirements of the practical application scenario, for example, the suppressor may also be arranged before the amplitude canceller, because the first noise with large amplitude in the noise signal is less and the new small-amplitude noise may not be generated if the setting is appropriate when eliminating the large-amplitude noise, therefore, the suppressor may be disposed before the canceller, as long as filtering of the spurious signal of the voltage signal of the first power supply VDD can be achieved, and the relative positional relationship between the suppressor and the canceller is not limited in the embodiments of the present application.
An embodiment of the present application further provides a display panel including the driving circuit of the organic light emitting diode of any one of the above. According to the display panel provided by the embodiment of the invention, the anode and the cathode of the organic light emitting diode are respectively and electrically connected with the first power supply and the second power supply, wherein the voltage of the first power supply is higher than that of the second power supply, the light emitting display of the organic light emitting diode is realized by utilizing the first power supply and the second power supply, the noise wave in the output voltage signal of the first power supply is eliminated by arranging the compensation module, the light emitting consistency of the organic light emitting diode is improved, the problem of rolling water ripple is solved, and the display effect of the display panel is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (9)
1. A driving circuit of an organic light emitting diode, comprising:
a first power supply electrically connected to an anode of the organic light emitting diode;
a second power supply electrically connected to a cathode of the organic light emitting diode; wherein a voltage of the first power supply is higher than a voltage of the second power supply; and
and the compensation module is used for compensating the output voltage of the first power supply and eliminating clutter in the output voltage of the first power supply.
2. The OLED driving circuit of claim 1, wherein the compensation module comprises a clipper for canceling the first spur in the output voltage of the first power supply.
3. The OLED driving circuit of claim 2, wherein the amplitude suppressor comprises a sampler for collecting the voltage signal of the first power source and an inverter for generating the compensation signal in phase opposition to the first spur in the voltage signal of the first power source.
4. The OLED driving circuit as claimed in claim 3, wherein the amplitude of the compensation signal is equal to the amplitude of the first noise.
5. The OLED driving circuit as claimed in claim 3, wherein the sampling frequency of the sampler comprises 100 times per frame.
6. The driving circuit of an organic light emitting diode according to claim 1, further comprising a suppressor for eliminating a second noise in the output voltage of the first power supply.
7. The OLED driving circuit as claimed in claim 6, wherein the suppressor is disposed between the first power source and the OLED.
8. The OLED driving circuit as recited in claim 6, wherein the suppressor comprises an RC filter circuit.
9. A display panel comprising the organic light emitting diode driving circuit according to any one of claims 1 to 8.
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