CN111862891B - Organic light emitting display - Google Patents
Organic light emitting display Download PDFInfo
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- CN111862891B CN111862891B CN201910337980.7A CN201910337980A CN111862891B CN 111862891 B CN111862891 B CN 111862891B CN 201910337980 A CN201910337980 A CN 201910337980A CN 111862891 B CN111862891 B CN 111862891B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
- H10K59/1315—Interconnections, e.g. wiring lines or terminals comprising structures specially adapted for lowering the resistance
Abstract
The invention relates to the technical field of display, and discloses an organic light-emitting display which comprises a display panel, wherein pixel units, a power line, a plurality of scanning lines arranged along the row direction of the pixel units, a voltage sensing signal output line and Thin Film Transistors (TFTs) corresponding to the scanning lines one by one are formed on the display panel in an array mode, wherein: between each pair of TFT and scanning line corresponding to each other, the grid of TFT is connected with the scanning line, the source of TFT is connected with the power line, and the drain of TFT is connected with the output line of voltage sensing signal. The TFTs are all transmitted by adopting the same voltage sensing signal output line, so that the spatial layout of the voltage sensing signal output line in the organic light-emitting display provided by the invention is greatly saved, and the organic light-emitting display provided by the invention can effectively solve the problem of current impedance and voltage drop by additionally arranging the TFTs in the display.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light emitting display.
Background
In the existing organic light emitting diode display screen, a pixel circuit driving mode is adopted, so that current impedance voltage drop can be generated on a power supply lead, and the voltage drop degree is more obvious along with the increase of the size of the display screen. The voltage drop phenomenon may cause the problem of poor display effect, for example: the brightness of the picture is not uniform, so that the current impedance drop is solved in the prior art.
However, the structure for solving the current impedance voltage drop in the prior art is complex, and the space occupied by each detection line is large.
Disclosure of Invention
The invention provides an organic light emitting display, which is beneficial to solving the problem of current impedance voltage drop by changing the structural design inside the display.
In order to achieve the purpose, the invention provides the following technical scheme:
an organic light emitting display, comprising a display panel, wherein pixel units distributed in an array manner, a power line, a plurality of scanning lines arranged along the row direction of the pixel units, a voltage sensing signal output line and Thin Film Transistors (TFTs) corresponding to the scanning lines one by one are formed on the display panel, wherein:
between each pair of the TFT and the scanning line which are corresponding to each other, the grid electrode of the TFT is connected with the scanning line, the source electrode of the TFT is connected with the power line, and the drain electrode of the TFT is connected with the voltage sensing signal output line.
In the organic light emitting display, the organic light emitting display includes a display panel, and pixel units, a power line, a plurality of scan lines, a voltage sensing signal output line, and thin film transistors TFT corresponding to the scan lines one to one are formed on the display panel in an array manner. When the organic light emitting display is used for displaying, scanning lines are turned on row by row, and for TFTs corresponding to the turned-on scanning lines, the TFTs derive a voltage on a power supply line connected to a source thereof through a voltage signal output line connected to a drain thereof. When the scanning lines are started line by line, the TFTs corresponding to the scanning lines started line by line are operated, and the TFTs are transmitted by adopting the same voltage sensing signal output line, so that the spatial layout of the voltage sensing signal output line in the organic light-emitting display provided by the invention is greatly saved, and the organic light-emitting display provided by the invention can effectively solve the problem of current impedance voltage drop by additionally arranging the TFTs in the display.
Therefore, the organic light emitting display is beneficial to solving the problem of current impedance voltage drop by changing the structural design inside the display.
Preferably, the power supply device further comprises a power supply control chip, wherein the power supply control chip is used for providing a preset reference voltage of the power supply line.
Preferably, the power supply system further comprises a compensation module for compensating the voltage drop of the power supply line.
Preferably, the compensation module comprises a voltage comparator, wherein:
the positive phase input end of the voltage comparator is connected with the power control chip, and the negative phase input end of the voltage comparator is connected with the voltage sensing signal output line and used for comparing the voltage output by the voltage sensing signal output line with a reference voltage to obtain a voltage difference value; alternatively, the first and second electrodes may be,
and the inverting input end of the voltage comparator is connected with the power control chip, and the non-inverting input end of the voltage comparator is connected with the voltage sensing signal output line and used for comparing the voltage output by the voltage sensing signal output line with a reference voltage to obtain a voltage difference value.
Preferably, the output end of the voltage comparator is connected with the power supply control chip, and the power supply control chip is further configured to compensate for the voltage drop of the power supply line according to the voltage difference value.
Preferably, the display device further comprises a data driving element located on the display panel, and the data driving element is connected with a plurality of data lines.
Preferably, the compensation module comprises an analog data conversion unit and a mixer, wherein:
the analog data conversion unit is used for comparing the voltage output by the voltage sensing signal output line with a reference voltage to obtain a voltage difference value and obtaining a corresponding display data compensation signal according to the voltage difference value;
the mixer is used for mixing the display data compensation signal with an initial display data signal.
Preferably, the data driving element is further configured to output a corresponding voltage according to a mixing result of the mixer.
Preferably, the display panel includes a display region and a non-display region, and the TFT is located in the non-display region.
Drawings
Fig. 1 is a schematic diagram of a basic architecture of an organic light emitting display according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of an organic light emitting display according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another embodiment of an organic light emitting display according to an embodiment of the invention.
Icon: 1-a power line; 2-scanning lines; 3-a voltage sense signal output line; 4-TFT; 5-power control chip; 6-data driving element; 7-a comparator; 8-capacitance.
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.
Referring to fig. 1, the present invention provides an organic light emitting display, which includes a display panel, wherein pixel units distributed in an array manner, a power line 1, a plurality of scan lines 2 arranged along a row direction of the pixel units, a voltage sensing signal output line 3, and thin film transistors TFT4 corresponding to the scan lines 2 one to one are formed on the display panel, wherein:
between each pair of the TFT4 and the scanning line 2 corresponding to each other, the gate of the TFT4 is connected to the scanning line 2, the source of the TFT4 is connected to the power supply line 1, and the drain of the TFT4 is connected to the voltage sensing signal output line 3.
In the organic light emitting display, the organic light emitting display includes a display panel, and pixel units, a power line 1, a plurality of scan lines 2, a voltage sensing signal output line 3, and thin film transistors TFT4 corresponding to the scan lines 2 in a one-to-one manner are formed on the display panel. When the organic light emitting display is used for display, when the scanning lines 2 are turned on row by row, the TFT4 derives the voltage on the power supply line 1 connected to the source thereof via the voltage signal output line connected to the drain thereof, for the TFT4 corresponding to the turned-on row of the scanning lines 2. When the scanning lines 2 are turned on line by line, the TFTs 4 corresponding to the scanning lines 2 turned on in each line perform the above operations, and each TFT4 transmits through the same voltage sensing signal output line 3, which greatly saves the spatial layout of the voltage sensing signal output line 3 in the organic light emitting display provided by the present invention, and the organic light emitting display provided by the present invention can effectively solve the current impedance voltage drop problem by adding the TFT4 inside the display.
Therefore, the organic light emitting display is beneficial to solving the problem of current impedance voltage drop by changing the structural design inside the display.
On the basis of the above technical solution, the organic light emitting display provided by the present invention further includes a power control chip 5, and the power control chip 5 is used for providing a preset reference voltage for the power line 1.
It should be noted that the voltage value output by the voltage sensing signal output line 3 may be compared with a preset reference voltage to detect whether the current impedance voltage drop exists in the display and the magnitude of the current impedance voltage drop.
On the basis of the above technical solution, the organic light emitting display provided by the present invention further includes a compensation module for compensating for a voltage drop of the power line 1.
It should be noted that the compensation module can dynamically compensate the voltage on the power line 1 according to a difference formed between the voltage value output by the voltage sensing signal output line 3 and a preset reference voltage, so as to eliminate the current impedance voltage drop phenomenon, and make the display screen of the display have good uniformity.
As an alternative embodiment, the compensation module comprises a voltage comparator 7, in which:
the positive phase input end of the voltage comparator 7 is connected with the power control chip 5, and the negative phase input end of the voltage comparator 7 is connected with the voltage sensing signal output line 3, so that the voltage output by the voltage sensing signal output line 3 is compared with the reference voltage to obtain a voltage difference value; alternatively, the first and second electrodes may be,
the inverting input terminal of the voltage comparator 7 is connected to the power control chip 5, and the non-inverting input terminal of the voltage comparator 7 is connected to the voltage sensing signal output line 3, so as to compare the voltage output by the voltage sensing signal output line 3 with the reference voltage, and obtain a voltage difference value, as shown in fig. 2.
And the output end of the voltage comparator 7 is connected with the power control chip 5, and the power control chip 5 is also used for compensating the voltage drop of the power line 1 according to the voltage difference value.
It should be noted that, the power control chip 5 is connected to the voltage comparator 7 in addition to generating the preset reference voltage, and receives the voltage difference value generated by the voltage comparator 7, and dynamically compensates the voltage drop of the power line 1 according to the voltage difference value, and the power line is grounded through the capacitor 8.
The organic light emitting display further includes a data driving element 6 disposed on the display panel, and the data driving element 6 is connected to a plurality of data lines.
As another alternative, please refer to fig. 3, the compensation module includes an analog data conversion unit and a mixer, wherein:
the analog data conversion unit is used for comparing the voltage output by the voltage sensing signal output line 3 with a reference voltage to obtain a voltage difference value and obtaining a corresponding display data compensation signal according to the voltage difference value;
a mixer for mixing the display data compensation signal with the initial display data signal.
And the data driving element 6 is also used for outputting corresponding voltage according to the mixing result of the mixer.
It should be noted that, after the mixer generates the mixed result signal for the display data compensation signal and the initial display data signal, the data driving unit converts the mixed result signal into a corresponding voltage value, and dynamically compensates the voltage drop of the power line 1 according to the voltage value, so as to improve the brightness of the display image.
On the basis of the above technical solution, the display panel includes a display area and a non-display area, and the TFT4 is located in the non-display area.
Note that, when the TFTs 4 are provided in the non-display area of the display panel, the influence on the display screen in the display area can be avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An organic light emitting display, comprising a display panel, wherein pixel units distributed in an array manner, a power line, a plurality of scan lines arranged along a row direction of the pixel units, a voltage sensing signal output line, and Thin Film Transistors (TFTs) corresponding to the scan lines one to one are formed on the display panel, wherein:
between each pair of the TFT and the scanning line which are corresponding to each other, the grid electrode of the TFT is connected with the scanning line, the source electrode of the TFT is connected with the power line, and the drain electrode of the TFT is connected with the voltage sensing signal output line;
the power supply control chip is used for providing a preset reference voltage of the power supply line;
the compensation module is used for dynamically compensating the voltage on the power line according to a difference value formed by a voltage value output by the voltage sensing signal output line and a preset reference voltage so as to eliminate the phenomenon of current impedance voltage drop, and the uniformity of the display picture of the organic light-emitting display is good.
2. The organic light emitting display of claim 1, wherein the compensation module comprises a voltage comparator, wherein:
the positive phase input end of the voltage comparator is connected with the power control chip, and the negative phase input end of the voltage comparator is connected with the voltage sensing signal output line and used for comparing the voltage output by the voltage sensing signal output line with a reference voltage to obtain a voltage difference value; alternatively, the first and second electrodes may be,
and the inverting input end of the voltage comparator is connected with the power control chip, and the non-inverting input end of the voltage comparator is connected with the voltage sensing signal output line and used for comparing the voltage output by the voltage sensing signal output line with a reference voltage to obtain a voltage difference value.
3. The organic light emitting display of claim 2, wherein the output terminal of the voltage comparator is connected to the power control chip, and the power control chip is further configured to compensate for the voltage drop of the power line according to the voltage difference value.
4. The organic light emitting display according to claim 1, further comprising a data driving element on the display panel, the data driving element having a plurality of data lines connected thereto.
5. The organic light emitting display of claim 4, wherein the compensation module comprises an analog data conversion unit and a mixer, wherein:
the analog data conversion unit is used for comparing the voltage output by the voltage sensing signal output line with a reference voltage to obtain a voltage difference value and obtaining a corresponding display data compensation signal according to the voltage difference value;
the mixer is used for mixing the display data compensation signal with an initial display data signal.
6. The organic light emitting display as claimed in claim 5, wherein the data driving device is further configured to output a corresponding voltage according to the mixing result of the mixer.
7. The organic light-emitting display according to any one of claims 1 to 6, wherein the display panel includes a display region and a non-display region, and the TFT is located in the non-display region.
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