CN109256093B - Organic light emitting display and data signal voltage adjusting method - Google Patents
Organic light emitting display and data signal voltage adjusting method Download PDFInfo
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- CN109256093B CN109256093B CN201811426487.4A CN201811426487A CN109256093B CN 109256093 B CN109256093 B CN 109256093B CN 201811426487 A CN201811426487 A CN 201811426487A CN 109256093 B CN109256093 B CN 109256093B
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
Abstract
The invention provides an organic light-emitting display and a data signal voltage adjusting method, wherein a pixel to be detected in the organic light-emitting display mainly comprises a pixel circuit and a light-emitting device, wherein the pixel circuit is used for responding to a data signal to control the light-emitting device to emit light or not to emit light in a preset black picture display period; and the data driving unit is used for generating the data signal in an initialization period before the black picture display period and adjusting the voltage value of the data signal to a critical minimum value which enables the light-emitting device not to emit light. The invention adjusts the voltage of the data signal when the organic light-emitting display displays the black picture, so that the organic light-emitting display outputs the data signal at the critical minimum value when displaying the black picture.
Description
Technical Field
The present invention relates to display technologies, and in particular, to an organic light emitting display and a method for adjusting a voltage of a data signal.
Background
An organic light emitting display is a display that displays an image using organic light emitting diodes. Organic light emitting displays may be classified into Passive Matrix Organic Light Emitting Displays (PMOLEDs) and Active Matrix Organic Light Emitting Displays (AMOLEDs) according to how the organic light emitting diodes are driven. An active matrix organic light emitting display includes a plurality of pixels arranged at intersections between scan lines and data lines. Each pixel includes a light emitting device and a pixel circuit for driving the light emitting device. The pixel circuit generally includes a switching transistor, a driving transistor, and a storage capacitor, wherein an N-type driving transistor is generally used. With the application of the active matrix organic light emitting display in various portable devices, it is very important to reduce the power consumption of the active matrix organic light emitting display.
When the active matrix organic light emitting display displays a black picture, the data line inputs a high level to turn off the N-type driving transistor, so that the light emitting device does not emit light. The conventional active matrix organic light emitting display sets a high voltage to a data line input voltage, so that all the active matrix organic light emitting displays can successfully display a black picture.
However, the inventor has found in the development process that the power consumption of the conventional active matrix organic light emitting display is high in the black frame display state.
Disclosure of Invention
The invention provides an organic light emitting display and a data signal voltage adjusting method, which reduce the power consumption of the organic light emitting display in a black picture display state and save electric energy.
According to a first aspect of the present invention, there is provided an organic light emitting display comprising:
the pixel to be tested comprises a pixel circuit and a light-emitting device, wherein the pixel circuit is used for responding to a data signal to control the light-emitting device to emit light or not to emit light in a preset black picture display period;
and the data driving unit is used for generating the data signal in an initialization period before the black picture display period and adjusting the voltage value of the data signal to a critical minimum value which enables the light-emitting device not to emit light.
Optionally, in a possible implementation manner of the first aspect, the method further includes:
a detecting unit for generating a first state signal indicating that the anode is not electrified or generating a second state signal indicating that the anode is electrified in response to an electrical signal of the anode of the light emitting device;
the data driving unit is specifically configured to generate the data signal in an initialization period before the black frame display period, and adjust a voltage value of the data signal to a critical minimum value at which the detection unit generates the first state signal.
Optionally, in another possible implementation manner of the first aspect, the detection unit includes a voltage detection unit;
the detection end of the voltage detection unit is connected with the anode of the light-emitting device, the output end of the voltage detection unit is connected with the data driving unit, and the voltage detection unit is used for: and transmitting the first state signal to the data driving unit when the voltage signal is not detected by the detection terminal, or transmitting the second state signal to the data driving unit when the voltage signal is detected by the detection terminal.
Optionally, in yet another possible implementation manner of the first aspect, the detection unit includes a current detection unit;
the detection end of the current detection unit is connected with the anode of the light-emitting device, the output end of the current detection unit is connected with the data driving unit, and the current detection unit is used for: and transmitting the first state signal to the data driving unit when the current signal is not detected by the detection terminal, or transmitting the second state signal to the data driving unit when the current signal is detected by the detection terminal.
Optionally, in a further possible implementation manner of the first aspect, the detection unit is specifically configured to generate a first status signal indicating that the anode is not powered or generate a second status signal indicating that the anode is powered in response to an electrical signal of the anode of the light emitting device in the black frame display period.
Optionally, in yet another possible implementation manner of the first aspect, the method further includes:
and a gate transistor for connecting the anode of the light emitting device to the detecting unit in the black screen display period and disconnecting the anode of the light emitting device from the detecting unit in other periods.
Optionally, in yet another possible implementation manner of the first aspect, the method further includes:
a timing control unit for generating a timing signal for controlling the black picture display period and the initialization period.
Optionally, in yet another possible implementation manner of the first aspect, the pixel circuit to be tested further includes:
a storage capacitor for storing electric energy of the data signal at an initialization period before the black picture display period;
a driving transistor for connecting between the light emitting device and a pixel power supply; the driving transistor is used for responding to the electric energy of the data signal stored in the storage capacitor in the black picture display period and controlling the light-emitting device to emit or not to emit light; wherein the driving transistor is an N-type transistor.
According to a second aspect of the present invention, there is also provided a method for adjusting a data signal voltage of an organic light emitting display, for use in the organic light emitting display according to the first aspect of the present invention and any possible implementation manner of the first aspect, the method including:
and generating a data signal in an initialization period before a preset black picture display period, and adjusting the voltage value of the data signal to a critical minimum value which enables the light-emitting device not to emit light.
Optionally, in a possible implementation manner of the second aspect, the adjusting the voltage value of the data signal to a critical minimum value at which the light emitting device does not emit light includes:
taking a preset black picture voltage value as a current voltage value of the data signal, wherein the black picture voltage value is a voltage value of the data signal which enables the light-emitting device not to emit light in a preset black picture display period;
inputting the data signal of the current voltage value into the pixel to be detected in the black picture display period, and judging whether the light-emitting device emits light,
if not, reducing the current voltage value by a voltage value of a preset increment to serve as a new current voltage value, and returning to execute the step of inputting the data signal of the current voltage value to the pixel to be detected in the black picture display period;
and if so, increasing the current voltage value by the voltage value of the preset increment to serve as the voltage value of the data signal.
Optionally, in another possible implementation manner of the second aspect, the determining whether the light emitting device emits light includes: judging whether an electric signal is detected at the anode of the light-emitting device, if so, determining that the light-emitting device emits light; and if not, determining that the light-emitting device does not emit light.
Optionally, in yet another possible implementation manner of the second aspect, the electrical signal comprises a voltage signal or a current signal.
The invention provides an organic light-emitting display and a data signal voltage adjusting method.A pixel to be detected in the organic light-emitting display mainly comprises a pixel circuit and a light-emitting device, wherein the pixel circuit is used for responding to a data signal to control the light-emitting device to emit light or not to emit light in a preset black picture display period; and the data driving unit is used for generating the data signal in an initialization period before the black picture display period and adjusting the voltage value of the data signal to a critical minimum value which enables the light-emitting device not to emit light. The invention adjusts the voltage of the data signal when the organic light-emitting display displays the black picture, so that the organic light-emitting display outputs the data signal at the critical minimum value when displaying the black picture.
Drawings
FIG. 1 is a schematic diagram of an organic light emitting display according to the prior art;
fig. 2 is a schematic structural diagram of an organic light emitting display according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a timing diagram of signals provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pixel under test according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another pixel under test according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another organic light emitting display according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another signal timing diagram provided by the embodiment of the present invention;
fig. 8 is a schematic flow chart illustrating a method for adjusting a voltage of a data signal of an organic light emitting display according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
It should be understood that in the present application, "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that, in the present invention, "a plurality" means two or more. "and/or" is merely an association describing an associated object, meaning that three relationships may exist, for example, and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "comprises A, B and C" and "comprises A, B, C" means that all three of A, B, C comprise, "comprises A, B or C" means that one of A, B, C comprises, "comprises A, B and/or C" means that any 1 or any 2 or 3 of A, B, C comprises.
As used herein, "at … …" can be interpreted as "if" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic diagram of an organic light emitting display in the prior art. The conventional organic light emitting display mainly includes a scan driving unit, a data driving unit, a timing control unit, and a plurality of pixels P arranged in a matrix. The driving transistors in the pixel P in the present invention are all N-type driving transistors. The scan driving unit supplies a scan signal to each pixel P with a scan line, and the data driving unit supplies a data signal to each pixel P with a data line, the pixels P being arranged at intersections between the scan lines and the data lines. The timing control unit transmits timing control signals to the scan driving unit and the data driving unit such that the scan driving unit and the data driving unit transmit scan signals and data signals to the respective pixels in response to control of the timing control signals. Before one or more pixels need to display a black picture, the data driving unit transmits a high-level data signal to the pixels needing to display the black picture through the data lines in the initialization period, so that the light-emitting devices in the pixels needing to display the black picture do not emit light in the black picture display period, and the display of the black picture is realized.
However, the manufacturing process and driving conditions of different organic light emitting displays are different, so that different organic light emitting displays can achieve different threshold voltages of data signals displayed by black frames.
Fig. 2 is a schematic structural diagram of an organic light emitting display according to an embodiment of the present invention. On the basis of the structure shown in fig. 1, in this embodiment, the data signal voltage when displaying the black image is adjusted by using the pixel to be measured, so as to reduce power consumption and energy consumption when displaying the black image. It can be understood that, since the manufacturing processes of all the pixels on the same organic light emitting display are the same and the driving conditions are the same, the lowest voltage values of the data signals for displaying the black frame of all the pixels on the whole organic light emitting display are the same. One pixel can be selected as a pixel to be tested for determining the lowest voltage value of the data signal when all pixels of the whole organic light emitting display the black picture. For example, as shown in fig. 2, the pixel to be tested may be a pixel in a first row and a first column, which is connected to the scan line S1 and the data line D1. The embodiment is not limited to this, and the pixel to be measured may be any other pixel.
The pixel to be tested in this embodiment mainly includes a pixel circuit and a light emitting device, and the pixel circuit is configured to control the light emitting device to emit light or not to emit light in response to a data signal in a preset black frame display period. Fig. 3 is a schematic diagram of a signal timing diagram according to an embodiment of the present invention. The black screen display period shown in fig. 3 can be understood as a period in which the data signal performs a control operation on the pixel under test. The scan signals of the low level are sequentially supplied into the scan lines S1, S2,. and.sn so that the respective pixels sequentially enter the initialization period of one scan cycle. An example of the timing of the scan signal and the data signal for black screen display in one scan period is shown in fig. 3. In the initialization period shown in fig. 3, a scan signal of a low level is supplied to the pixel circuit of the pixel under test so that a data signal is stored in the pixel circuit, and then the light emitting device is controlled to emit light or not emit light by the data signal in the following black picture display period. The Light-Emitting device can be understood as an Organic Light-Emitting Diode (OLED).
The data driving unit in this embodiment is configured to generate the data signal in an initialization period before the black frame display period, and adjust a voltage value of the data signal to a critical minimum value at which the light emitting device does not emit light. For example, the data driving unit obtains the light emitting condition of the light emitting device in the pixel to be tested through the detection line F in fig. 2, and adjusts the voltage value of the data signal, and when the light emitting device is in a critical state that the light emitting device is about to emit light but not emit light, the voltage value of the critical lowest value is obtained as the voltage value when the data signal displays a black picture. Specifically, in the initialization period shown in fig. 3, the scan signal S of the low level causes the data signal D of the high level generated by the data driving unit to be input to the pixel circuit for storage, and then in the black picture display period, the scan signal S of the high level causes the data signal D to be electrically disconnected from the pixel circuit which performs control of light emission or non-light emission of the light emitting device using the electric power of the data signal stored in the initialization period. In the case of a color picture display period, the pixel circuit controls the light emitting device to emit light using the power of the data signal stored in the initialization period. In the black frame display period of the present embodiment, the duration is the same as that of the color frame display period, but since the stored power is used for displaying the black frame, the pixel circuit controls the light emitting device to be in the non-light emitting state by using the power of the data signal stored in the initialization period. The data driving unit adjusts a voltage of a data signal generated in an initialization period in a next scanning cycle, and then detects whether the light emitting device still does not emit light until a voltage value of the data signal is adjusted to a critical minimum value at which the light emitting device does not emit light.
Among them, the timing control of the black picture period and the initialization period shown in fig. 3 may be realized by a timing control unit. For example, referring to the structure shown in fig. 2, the display may further include a timing control unit for generating a timing signal for controlling the black picture display period and the initialization period. The timing control unit transmits timing signals to the scan driving unit and the data driving unit to realize synchronous output of the data signals and the scan signals as shown in fig. 3.
In the organic light emitting display and the data signal voltage adjusting method provided by this embodiment, a pixel to be measured in the organic light emitting display mainly includes a pixel circuit and a light emitting device, and the pixel circuit is configured to control the light emitting device to emit light or not to emit light in response to a data signal during a preset black frame display period; and the data driving unit is used for generating the data signal in an initialization period before the black picture display period and adjusting the voltage value of the data signal to a critical minimum value which enables the light-emitting device not to emit light. The embodiment adjusts the voltage of the data signal when the organic light emitting display displays the black picture, so that the organic light emitting display outputs the data signal at the critical lowest value when displaying the black picture.
Fig. 4 is a schematic structural diagram of a pixel to be measured according to an embodiment of the present invention. The pixel circuit used in each pixel in the embodiment shown in fig. 2 may be a 2T1C pixel circuit, a 7T1C pixel circuit, or another pixel circuit capable of driving a light emitting device, and the structure of the display will be described with the 2T1C pixel circuit as an example in conjunction with fig. 4.
The embodiment shown in fig. 4 also includes a detection unit. The detection unit is used for responding to an electric signal of an anode of the light-emitting device and generating a first state signal indicating that the anode is not electrified or generating a second state signal indicating that the anode is electrified. It can be understood that the detection unit is used for detecting an electrical signal of the anode of the light emitting device and feeding back the detection result to the data driving unit. The data driving unit is specifically configured to generate the data signal in an initialization period before the black frame display period, and adjust a voltage value of the data signal to a critical minimum value at which the detection unit generates the first state signal. It can be understood that, when the data driving unit receives the first state signal in the current scan period, the voltage value of the data signal is turned down once in the next scan period until the second state signal is received, and the voltage value of the data signal in the previous scan period is used as the critical minimum value of the finally determined data signal and is also the voltage value of the finally determined data signal for displaying the black picture.
It can be understood that, in the testing stage before factory shipment, the debugging of the data voltage under the display black picture is performed by using the structures of the detection unit, the detection line F, and the like in the embodiment. After debugging is finished, the functions and functions of the detection unit can be cancelled by stripping the structures of the detection unit, the detection line F and the like, or disconnecting the power supply of the detection unit, or disconnecting the connection between the detection unit and the anode of the light-emitting device or the data driving unit, or setting modes of not processing state signals transmitted by the detection unit in the data driving unit, and the like, so that the detection unit is prevented from influencing other circuits in the normal working and normal display processes of the display.
The detecting unit may have various structures, and may be, for example, a voltage detecting unit or a current detecting unit.
In an implementation manner that the detection unit is a voltage detection unit, a detection end of the voltage detection unit is connected with an anode of the light emitting device, and an output end of the voltage detection unit is connected with the data driving unit. The voltage detection unit is used for: and transmitting the first state signal to the data driving unit when the voltage signal is not detected by the detection terminal, or transmitting the second state signal to the data driving unit when the voltage signal is detected by the detection terminal.
In an implementation manner that the detection unit is a current detection unit, a detection end of the current detection unit is connected with an anode of the light emitting device, and an output end of the current detection unit is connected with the data driving unit. The current detection unit is used for: and transmitting the first state signal to the data driving unit when the current signal is not detected by the detection terminal, or transmitting the second state signal to the data driving unit when the current signal is detected by the detection terminal.
In the above embodiment, the pixel circuit may further include: a storage capacitor and a drive transistor. And the storage capacitor is used for storing the electric energy of the data signal in an initialization period before the black picture display period. A driving transistor for connecting between the light emitting device and a pixel power supply; the driving transistor is used for controlling the light-emitting device to emit or not to emit light in response to the electric energy of the data signal stored in the storage capacitor in the black picture display period. Wherein the driving transistor is an N-type transistor.
In the embodiment, the detection unit detects the electric signal of the anode of the light-emitting device and feeds the electric signal back to the data driving unit, and the data driving unit can directly acquire the state signal indicating whether the light-emitting device emits light, so that the accuracy of adjusting the voltage of the data signal for displaying the black picture is improved.
Fig. 5 is a schematic structural diagram of another pixel under test according to an embodiment of the present invention. Fig. 6 is a schematic structural diagram of another organic light emitting display according to an embodiment of the present invention. The embodiment shown in fig. 5 is added with a gating transistor T0 on the basis of the embodiment shown in fig. 4. Referring to fig. 5 and 6, the gate transistor T0 is controlled by the timing control signal T output from the timing control unit to be turned on only in the black picture display period, i.e., the detection unit detects only the anode signal of the light emitting device in the black picture display period.
In this embodiment, the detecting unit is specifically configured to generate a first status signal indicating that the anode is not powered or generate a second status signal indicating that the anode is powered in response to an electrical signal of the anode of the light emitting device in the black frame display period. Preferably, referring to fig. 5, the display may further include a gating transistor. The gate transistor is configured to turn on and connect the anode of the light emitting device to the detection unit in the black screen display period, and to turn off and connect the anode of the light emitting device to the detection unit in other periods. The gate transistor may be understood as a field effect transistor or a triode capable of conductively connecting the anode of the light emitting device with the detecting unit in the black frame display period in response to the control of the timing signal. The timing control unit is also connected to the pixel under test, as shown in fig. 5 and 6, for example. Fig. 7 is a schematic diagram of another signal timing diagram according to an embodiment of the present invention. Referring to fig. 5 to 7, the timing control unit is specifically connected to a control terminal of the gate transistor (for example, a gate of the N-type fet) through a timing control line, and transmits a timing control signal T having a black picture display period to the gate transistor, so that the gate transistor is turned on in the black picture display period.
The detection unit in the embodiment only performs anode detection on the light emitting device in the black picture display period, and does not perform detection in other periods, so that interference possibly generated by signals in other periods is reduced, and the detection accuracy of the light emitting device in the black picture display period is further improved.
Fig. 8 is a schematic flow chart of a method for adjusting a data signal voltage of an organic light emitting display according to an embodiment of the present invention. The data signal voltage adjusting method of the organic light emitting display shown in fig. 8 may be applied to the organic light emitting display in the above-described various embodiments, and the execution subject of the method may be the data driving unit. The data driving unit generates a data signal in an initialization period before a preset black picture display period, and adjusts a voltage value of the data signal to a critical minimum value at which the light emitting device does not emit light.
The process of adjusting the voltage value of the data signal to the critical minimum value that makes the light emitting device not emit light by the data driving unit may mainly include steps S101 to S104 shown in fig. 8, which are as follows:
and S101, taking a preset black picture voltage value as the current voltage value of the data signal, wherein the black picture voltage value is the voltage value of the data signal which enables the light-emitting device not to emit light in a preset black picture display period.
The preset black frame voltage value may be a high voltage value preset for a data signal displaying a black frame in the related art. The data signal with a high voltage value is adopted for the first time, so that the light-emitting device is ensured to be adjusted in a black picture.
And S102, inputting the data signal of the current voltage value into the pixel to be detected in the black picture display period, and judging whether the light-emitting device emits light or not. If so, the process proceeds to step S104, and if not, the process proceeds to step S103.
The method in which it is judged whether the light emitting device emits light may be: judging whether an electric signal is detected at the anode of the light-emitting device, if so, determining that the light-emitting device emits light; and if not, determining that the light-emitting device does not emit light. The electrical signal may be a voltage signal or a current signal.
And S103, if not, reducing the current voltage value by a voltage value of a preset increment to serve as a new current voltage value, and returning to execute the step of inputting the data signal of the current voltage value to the pixel to be detected in the black picture display period.
And S104, if so, increasing the current voltage value by the voltage value of the preset increment to be used as the voltage value of the data signal.
In this embodiment, the voltage of the data signal is adjusted in the organic light emitting display, and the voltage value of the data signal is adjusted to the critical minimum value that the light emitting device does not emit light, so that the power consumption of the display is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An organic light emitting display, comprising:
the pixel to be tested comprises a pixel circuit and a light-emitting device, wherein the pixel circuit is used for responding to a data signal to control the light-emitting device to emit light or not to emit light in a preset black picture display period;
the data driving unit is used for generating the data signal in an initialization period before the black picture display period and adjusting the voltage value of the data signal to a critical minimum value which enables the light-emitting device not to emit light;
the organic light emitting display further includes:
a detecting unit for generating a first state signal indicating that the anode is not electrified or generating a second state signal indicating that the anode is electrified in response to an electrical signal of the anode of the light emitting device;
the data driving unit is specifically configured to generate the data signal in an initialization period before the black frame display period, and use a preset black frame voltage value as a current voltage value of the data signal, where the black frame voltage value is a voltage value of the data signal that causes the light emitting device to emit no light in the preset black frame display period; inputting the data signal of the current voltage value into the pixel to be detected in the black picture display period, judging whether the light-emitting device emits light or not, if not, reducing the current voltage value by a voltage value of a preset increment as a new current voltage value, and returning to execute the step of inputting the data signal of the current voltage value into the pixel to be detected in the black picture display period; and if so, increasing the current voltage value by the voltage value of the preset increment to serve as the voltage value of the data signal.
2. The organic light emitting display according to claim 1, wherein the detection unit comprises a voltage detection unit;
the detection end of the voltage detection unit is connected with the anode of the light-emitting device, the output end of the voltage detection unit is connected with the data driving unit, and the voltage detection unit is used for: and transmitting the first state signal to the data driving unit when the voltage signal is not detected by the detection terminal, or transmitting the second state signal to the data driving unit when the voltage signal is detected by the detection terminal.
3. The organic light emitting display according to claim 1, wherein the detection unit comprises a current detection unit;
the detection end of the current detection unit is connected with the anode of the light-emitting device, the output end of the current detection unit is connected with the data driving unit, and the current detection unit is used for: and transmitting the first state signal to the data driving unit when the current signal is not detected by the detection terminal, or transmitting the second state signal to the data driving unit when the current signal is detected by the detection terminal.
4. The organic light emitting display according to any of claims 1 to 3, wherein the detecting unit is specifically configured to generate a first status signal indicating that the anode is not powered or generate a second status signal indicating that the anode is powered in response to an electrical signal of the anode of the light emitting device during the black frame display period.
5. The organic light-emitting display according to claim 4, further comprising:
and a gate transistor for connecting the anode of the light emitting device to the detecting unit in the black screen display period and disconnecting the anode of the light emitting device from the detecting unit in other periods.
6. The organic light-emitting display according to any one of claims 1 to 3, further comprising:
a timing control unit for generating a timing signal for controlling the black picture display period and the initialization period.
7. The organic light emitting display according to any one of claims 1 to 3, wherein the pixel circuit under test further comprises:
a storage capacitor for storing electric energy of the data signal at an initialization period before the black picture display period;
a driving transistor for connecting between the light emitting device and a pixel power supply; the driving transistor is used for responding to the electric energy of the data signal stored in the storage capacitor in the black picture display period and controlling the light-emitting device to emit or not to emit light; wherein the driving transistor is an N-type transistor.
8. A method for adjusting a data signal voltage of an organic light emitting display, the method being applied to the organic light emitting display according to any one of claims 1 to 7, the method comprising:
generating a data signal in an initialization period before a preset black picture display period, and adjusting a voltage value of the data signal to a critical minimum value at which the light emitting device does not emit light;
the adjusting the voltage value of the data signal to a critical minimum value at which the light emitting device does not emit light includes:
taking a preset black picture voltage value as a current voltage value of the data signal, wherein the black picture voltage value is a voltage value of the data signal which enables the light-emitting device not to emit light in a preset black picture display period;
inputting the data signal of the current voltage value into the pixel to be detected in the black picture display period, and judging whether the light-emitting device emits light,
if not, reducing the current voltage value by a voltage value of a preset increment to serve as a new current voltage value, and returning to execute the step of inputting the data signal of the current voltage value to the pixel to be detected in the black picture display period;
and if so, increasing the current voltage value by the voltage value of the preset increment to serve as the voltage value of the data signal.
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