CN104599634A - Active-matrix organic light emitting display with high aperture ratio - Google Patents
Active-matrix organic light emitting display with high aperture ratio Download PDFInfo
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- 239000011159 matrix material Substances 0.000 title claims abstract description 31
- 239000010409 thin film Substances 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 8
- 229920001621 AMOLED Polymers 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 14
- 239000002184 metal Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000012935 Averaging Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
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Abstract
The invention provides an active-matrix organic light emitting display with a high aperture ratio. The active-matrix organic light emitting display comprises a first driving circuit, a second driving circuit and an organic light emitting diode, a first input end of the first driving circuit receives a first data signal while a second input end of the same receives a second scanning signal, an output end of the first driving circuit outputs a first current signal, a first input end of the second driving circuit receives a second data signal while a second input end of the same receives a second scanning signal, an output end of the second driving circuit outputs a second current signal, the two scanning signals are scanning signals of two adjacent rows, an anode of the organic light emitting diode is electrically coupled to the output ends of the first driving circuit and the second driving circuit, and current flowing through the organic light emitting diode is a numerical value acquired after the first current signal and the second current signal are superposed. Compared with the prior art, the active-matrix organic light emitting display has the advantages that two sub pixels identical in color are connected by anodes, so that distance between each two anodes can be shortened, space between a pixel defining layer and the anodes can be shortened, and aperture ratio of the sub pixels can be increased.
Description
Technical Field
The present invention relates to an organic light emitting display, and more particularly, to an active matrix organic light emitting display having a high aperture ratio.
Background
In recent years, conventional displays have been gradually replaced by portable thin flat panel displays. Organic or inorganic light emitting displays, which are self-luminous displays, have more advantages than other flat panel displays because they can provide a wide viewing angle and good contrast ratio, and have a fast response speed. As such, Organic or inorganic Light Emitting displays have attracted considerable attention as next generation displays, and in particular, Organic Light Emitting Displays (OLEDs) including a Light Emitting layer formed of an Organic material provide color images while having higher luminance, lower driving voltage, and faster response time than inorganic Light Emitting displays.
Generally, the organic light emitting display is classified into a Passive Matrix OLED (PMOLED) and an Active Matrix OLED (AMOLED) according to a driving method. The PMOLED does not emit light when data is not written, and emits light only during data writing. The driving mode has simple structure, low cost and easy design, and is mainly suitable for small and medium size displays. For an AMOLED display, each pixel of the pixel array has a storage capacitor for storing data, such that each pixel is maintained in a light-emitting state. The power consumption of the AMOLED display is significantly less than that of the PMOLED display, and the driving method is more suitable for developing a large-sized and high-resolution display, so that the AMOLED display is the main direction of future development.
However, when the AMOLED panel is going to be developed with high resolution, the process capability is usually limited, such as the distance between the high-precision Metal Mask (FMM) and the Pixel Definition Layer (PDL), the distance between the Anode and the high-precision Metal Mask, and the distance between the Anode (Anode) and the Anode all limit the aperture ratio of the sub-pixel, and the aperture ratio cannot be increased to prevent the resolution of the panel from being further improved.
In view of the above, a problem to be solved by those skilled in the art is how to design an active matrix organic light emitting display with high aperture ratio to eliminate the above defects or shortcomings in the prior art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art active matrix organic light emitting display in increasing the aperture ratio of the sub-pixels, the present invention provides a novel active matrix organic light emitting display with high aperture ratio.
In accordance with an aspect of the present invention, there is provided an Active Matrix Organic Light Emitting Display (AMOLED) having a high aperture ratio, including:
the first driving circuit comprises a first input end, a second input end and an output end, wherein the first input end receives a first data signal, the second input end receives a first scanning signal, and the output end outputs a first current signal;
the second driving circuit comprises a first input end, a second input end and an output end, wherein the first input end receives a second data signal, the second input end receives a second scanning signal, the output end outputs a second current signal, and the first scanning signal and the second scanning signal are scanning signals of two adjacent rows; and
and an organic light emitting diode, an anode of which is electrically coupled to the output terminal of the first driving circuit and the output terminal of the second driving circuit, and a cathode of which is electrically coupled to a second voltage, wherein a current flowing through the organic light emitting diode is a value obtained by superimposing the first current signal and the second current signal.
In one embodiment, the first driving circuit is configured to drive a first sub-pixel, the second driving circuit is configured to drive a second sub-pixel, and the first sub-pixel and the second sub-pixel are adjacent same-color sub-pixels in a same column.
In one embodiment, the first driving circuit and the second driving circuit are electrically coupled to a first voltage, and the first voltage is greater than the second voltage.
In one embodiment, the first data signal and the second data signal correspond to the same gray scale value.
In one embodiment, the first scan signal and the second scan signal are synchronized in timing.
In one embodiment, the first driving circuit and the second driving circuit each include two thin film transistors and a capacitor.
In one embodiment, each of the first driving circuit and the second driving circuit includes six thin film transistors and one capacitor.
In one embodiment, the thin film transistor is a P-type transistor, and when the gate is at a low level, the thin film transistor is turned on; when the gate is high, the thin film transistor is turned off.
The first input end of the first driving circuit of the active matrix organic light-emitting display receives a first data signal, the second input end of the first driving circuit receives a first scanning signal, and the output end of the first driving circuit outputs a first current signal; the first input end of the second driving circuit receives a second data signal, the second input end receives a second scanning signal, the output end outputs a second current signal, and the anode of the organic light emitting diode is electrically coupled to the output end of the first driving circuit and the output end of the second driving circuit, so that the current flowing through the organic light emitting diode is a value obtained by superposing the first current signal and the second current signal. Compared with the prior art, the invention connects the two sub-pixels with the same color by the anode, thereby reducing the distance between the respective anodes, reducing the distance between the pixel definition layer and the anode and increasing the aperture opening ratio of the sub-pixels. In addition, since the flowing current of the organic light emitting diode is the sum of the output currents of the respective driving circuits of the two sub-pixels, the detail moire (mura) of the display screen can be improved by current averaging.
Drawings
The various aspects of the present invention will become more apparent to the reader after reading the detailed description of the invention with reference to the attached drawings. Wherein,
fig. 1 shows a schematic diagram of a pixel structure of an active matrix organic light emitting display in the prior art;
fig. 2 shows a schematic diagram of a pixel structure of another active matrix organic light emitting display in the prior art;
FIG. 3 is a schematic diagram illustrating the effect of the gap between the high-precision metal mask and the pixel definition layer, the gap between the anode and the high-precision metal mask, and the gap between the anode and the cathode on the sub-pixel aperture ratio in the pixel structure of FIG. 2;
FIG. 4 is a schematic diagram of a circuit architecture of an AMOLED according to an embodiment of the present invention;
FIGS. 5A and 5B are schematic diagrams illustrating the comparison between the anode-to-anode distance and the anode-to-pixel defining layer distance after the pixel structure of the active matrix organic light emitting display is connected with the anode before the anode is connected in series;
FIG. 6 is a schematic diagram of a driving circuit of an active matrix organic light emitting display according to the present invention adopting a "2T 1C" architecture; and
fig. 7 shows a schematic diagram of a driving circuit of an active matrix organic light emitting display according to the present invention adopting a "6T 1C" architecture.
Detailed Description
In order to make the present disclosure more complete and complete, reference is made to the accompanying drawings, in which like references indicate similar or analogous elements, and to the various embodiments of the invention described below. However, it will be understood by those of ordinary skill in the art that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for illustrative purposes and are not drawn to scale.
Specific embodiments of various aspects of the present invention are described in further detail below with reference to the accompanying drawings. Hereinafter and in the drawings, a black rectangular frame represents a red sub-pixel, a diagonal rectangular frame represents a green sub-pixel, and a white rectangular frame represents a blue sub-pixel, unless otherwise specified.
Fig. 1 shows a schematic diagram of a pixel structure of an active matrix organic light emitting display in the prior art. Referring to fig. 1, a conventional pixel structure includes a pixel array having a plurality of pixels, each including a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. However, the structure uses a large number of openings in a high-precision Metal Mask (Fine Metal Mask), has a narrow alignment margin (e.g., only 13 μm positive or negative), has a small aperture ratio, and has a low process yield.
Fig. 2 shows a schematic diagram of a pixel structure of another active matrix organic light emitting display in the prior art. FIG. 3 is a schematic diagram illustrating the effect of the gap between the high-precision metal mask and the pixel definition layer, the gap between the anode and the high-precision metal mask, and the gap between the anode and the cathode on the sub-pixel aperture ratio in the pixel structure of FIG. 2.
Referring to fig. 2, the improved conventional pixel structure includes a plurality of pixels, each of which is composed of a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B in each of the pixels P are arranged in a triangle. In addition, to reduce the FMM aperture number and increase the alignment margin (e.g., increasing the margin from 13 microns to 20-25 microns), a single high-precision metal mask M may be used for two same-color sub-pixels in different pixels. Specifically, the same photomask is adopted for two red sub-pixels adjacent to each other up and down, the same photomask is adopted for two green sub-pixels adjacent to each other up and down, and the same photomask is also adopted for two blue sub-pixels adjacent to each other up and down.
In fig. 3, reference numeral 100 denotes an anode of an organic light emitting element of a Pixel, 102 denotes a Pixel Definition Layer (PDL), and 104 denotes a high-precision metal mask. The space (space) between the anode and the anode is S1, the space between the anode and the pixel definition layer is S2, and the space between the pixel definition layer and the high-precision metal mask is S3. However, due to the limitation of the process capability, the spacings S1-S3 still limit the aperture ratio of the sub-pixels.
Fig. 4 is a schematic circuit diagram of an active matrix organic light emitting display according to an embodiment of the invention.
Referring to fig. 4, in this embodiment, the active matrix organic light emitting display 20 of the present invention includes a first driving circuit and a second driving circuit. The first driving circuit includes a first input terminal, a second input terminal and an output terminal, the first input terminal receives a first data signal D1, the second input terminal receives a first scan signal S1, and the output terminal outputs a first current signal I1. The second driving circuit includes a first input terminal receiving a second data signal D2, a second input terminal receiving a second scan signal S2, and an output terminal outputting a second current signal I2. The first scan signal S1 and the second scan signal S2 are scan signals of two adjacent rows. The anode of the organic light emitting diode OLED is electrically coupled to the output terminal of the first driving circuit and the output terminal of the second driving circuit, and the cathode thereof is electrically coupled to a second voltage VSS.
As can be seen from the above, the current flowing through the organic light emitting diode OLED is a value obtained by superimposing the first current signal I1 and the second current signal I2. That is, the respective driving currents of the first and second driving circuits flow into the organic light emitting diode OLED to collectively light the organic light emitting diode OLED.
In one embodiment, the first driving circuit is used for driving a first sub-pixel, the second driving circuit is used for driving a second sub-pixel, and the first sub-pixel and the second sub-pixel are adjacent sub-pixels with the same color in the same column. In addition, the first driving circuit and the second driving circuit are both electrically coupled to a first voltage VDD, and the first voltage VDD is greater than the second voltage VSS.
In one embodiment, the first data signal D1 and the second data signal D2 correspond to the same gray scale values. In addition, the first scan signal S1 and the second scan signal S2 are synchronized in timing, or the first scan signal S1 and the second scan signal S2 employ the same clock pulse control signal.
Fig. 5A and 5B are schematic diagrams illustrating comparison between the anode-to-anode distance and the anode-to-pixel defining layer distance after the pixel structure of the active matrix organic light emitting display is connected with the anode before the anode is connected in series, respectively. Fig. 5A is a schematic view of layout corresponding to the conventional pixel structure of fig. 2, and fig. 5B is a schematic view of layout corresponding to the pixel structure of the present invention of fig. 4. As can be seen from fig. 5A and 5B, when not connected in series, the spacing between the anode RA1 and the anode RA2 affects the aperture ratio of the sub-pixel, and the spacing S2 between the anode and the pixel defining layer also decreases the aperture ratio of the sub-pixel; after series connection, a monolithic anode RA is formed, so that the spacing between anode RA1 and anode RA2 can be eliminated and the spacing between the anode and the pixel defining layer can be reduced.
Fig. 6 shows a schematic diagram of a driving circuit of an active matrix organic light emitting display according to the present invention adopting a "2T 1C" architecture. It should be noted that 2T, i.e., two thin film transistors, 1C, in each driving circuit of fig. 6 is a storage capacitor connected across the gate and the source of one of the thin film transistors. That is, the term "mTnC" indicates that the number of thin film transistors is m, the number of storage capacitors is n, and m and n are natural numbers.
In one embodiment, one driving circuit receives the Scan signal Scan and the Data signal Data and outputs the current I1, and the other driving circuit also receives the Scan signal Scan and the Data signal Data and outputs the current I2. The thin film transistor is a P-type transistor, and when the grid is at a low level, the thin film transistor is switched on; when the gate is high, the thin film transistor is turned off.
Fig. 7 shows a schematic diagram of a driving circuit of an active matrix organic light emitting display according to the present invention adopting a "6T 1C" architecture. Each of the driving circuits of fig. 7 includes 6 thin film transistors and 1 capacitor.
In one embodiment, each of the driving circuits receives the (n-1) th Scan signal Scan (n-1), the nth Scan signal Scan (n), the emission control signal EM, and the Data signal Data. The left driving circuit outputs a driving current I1, and the right driving circuit outputs a driving current I2, so that the organic light emitting diode OLED flows a current which is the sum of the driving current I1 and the driving current I2.
The first input end of the first driving circuit of the active matrix organic light-emitting display receives a first data signal, the second input end of the first driving circuit receives a first scanning signal, and the output end of the first driving circuit outputs a first current signal; the first input end of the second driving circuit receives a second data signal, the second input end receives a second scanning signal, the output end outputs a second current signal, and the anode of the organic light emitting diode is electrically coupled to the output end of the first driving circuit and the output end of the second driving circuit, so that the current flowing through the organic light emitting diode is a value obtained by superposing the first current signal and the second current signal. Compared with the prior art, the invention connects the two sub-pixels with the same color by the anode, thereby reducing the distance between the respective anodes, reducing the distance between the pixel definition layer and the anode and increasing the aperture opening ratio of the sub-pixels. In addition, since the flowing current of the organic light emitting diode is the sum of the output currents of the respective driving circuits of the two sub-pixels, the detail moire (mura) of the display screen can be improved by current averaging.
Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (8)
1. An active matrix organic light emitting display having a high aperture ratio, the active matrix organic light emitting display comprising:
the first driving circuit comprises a first input end, a second input end and an output end, wherein the first input end receives a first data signal, the second input end receives a first scanning signal, and the output end outputs a first current signal;
the second driving circuit comprises a first input end, a second input end and an output end, wherein the first input end receives a second data signal, the second input end receives a second scanning signal, the output end outputs a second current signal, and the first scanning signal and the second scanning signal are scanning signals of two adjacent rows; and
and an organic light emitting diode, an anode of which is electrically coupled to the output terminal of the first driving circuit and the output terminal of the second driving circuit, and a cathode of which is electrically coupled to a second voltage, wherein a current flowing through the organic light emitting diode is a value obtained by superimposing the first current signal and the second current signal.
2. The AMOLED display as claimed in claim 1, wherein the first driving circuit is configured to drive a first sub-pixel, the second driving circuit is configured to drive a second sub-pixel, and the first sub-pixel and the second sub-pixel are adjacent same color sub-pixels in a same column.
3. The AMOLED display as claimed in claim 1, wherein the first and second driving circuits are electrically coupled to a first voltage, and the first voltage is greater than the second voltage.
4. The AMOLED display as claimed in claim 1, wherein the first and second data signals correspond to the same gray scale value.
5. The active matrix organic light emitting display of claim 1, wherein the first scan signal and the second scan signal are synchronized in timing.
6. The active matrix organic light emitting display of claim 1, wherein the first and second driving circuits each comprise two thin film transistors and a capacitor.
7. The active matrix organic light emitting display of claim 1, wherein the first and second driving circuits each comprise six thin film transistors and one capacitor.
8. The active matrix organic light emitting display device of claim 6 or 7, wherein the thin film transistor is a P-type transistor, and when the gate is at a low level, the thin film transistor is turned on; when the gate is high, the thin film transistor is turned off.
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| CN106611586A (en) * | 2017-03-08 | 2017-05-03 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method, organic light-emitting display panel and display device |
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