TWI460706B - Organic light-emitting display and driving circuit thereof and method of driving the same - Google Patents

Description

Organic light emitting display and driving circuit thereof and method for driving same

The present invention relates to an organic light emitting display and a driving circuit thereof, and a driving method thereof, and more particularly to an organic light emitting display having three transistors for each pixel and a driving circuit thereof, and a method of driving the driving circuit.

In recent years, organic light-emitting display (OLED) displays have gradually become popular emerging flat-panel displays due to self-illumination, wide viewing angle, fast response time, high luminous efficiency, low operating voltage, and thin panel thickness. It can be made into a flexible panel and has a simple process, so it has been widely used in various flat display products.

The pixel of a conventional organic light emitting display controls and drives an organic light emitting diode as a display unit with a switching transistor and a driving transistor. However, after driving the transistor for a long time, a shift in the threshold voltage is generated. Moreover, when the organic light emitting display displays a picture, the positions of the driving transistors are different from the operation time, so that the offset of the threshold voltage of each driving transistor is also different. Furthermore, the driving current system of the organic light emitting diode has a square proportional relationship with the difference between the voltage difference between the gate and the source of the driving transistor and the threshold voltage. In this way, when the pixels of different regions receive the pixel data having the same voltage, the values of the driving currents supplied to the organic light-emitting diodes are inconsistent among the pixels due to the difference in the threshold voltages of the driving transistors. When the organic light-emitting diode receives the voltage of the same pixel data, the brightness is different, so that the picture displayed by the organic light-emitting display is uneven.

Therefore, it has been developed to add a compensation circuit to each pixel to drive the organic light-emitting diode with four transistors and two capacitors, and to compensate for the error of the threshold voltage. However, as the size of the organic light-emitting display panel is reduced, the aperture ratio of the pixel is lowered, and the increase of the compensation circuit greatly limits the aperture ratio of each pixel. In view of this, it is an industry goal to increase the aperture ratio of the pixels of the organic light emitting display and maintain the uniformity of the displayed image.

One of the main objects of the present invention is to provide an organic light emitting display, a driving circuit thereof, and a method of driving the same in order to increase the aperture ratio of a pixel of the organic light emitting display.

To achieve the above object, the present invention provides a method of driving a driving circuit of an organic light emitting display. The driving circuit comprises a plurality of pixels and a control component, and each pixel comprises a first transistor, a second transistor, a third transistor, a capacitor and an organic light emitting diode, wherein the control component is electrically connected To the first end of the second transistor. Firstly, a reference voltage is respectively supplied to charge the first end of each capacitor electrically connected to the control end of each second transistor, and a reset voltage pair is electrically connected to the second end of each of the second transistors and each The second end of each capacitor of the anode of the organic light emitting diode is discharged. Then, stopping the discharge of the second end of each capacitor, and providing a The driving voltage signal is applied to the first ends of the second transistors to charge the second ends of the capacitors electrically connected to the second ends of the second transistors. Subsequently, the first end of each capacitor is charged with a data voltage, and the driving voltage signal is stopped. Then, the first ends of the capacitors are floated, and the organic light emitting diodes are driven.

To achieve the above objective, the present invention provides an organic light emitting display comprising a substrate, a plurality of data lines, a plurality of reset voltage lines, a plurality of scan lines, a plurality of driving voltage lines, a plurality of reset signal lines, and a plurality of Pixel. The data lines are sequentially arranged on the substrate along a first direction, and each data line is used to transmit a reference voltage or a data voltage. The reset voltage lines are sequentially arranged on the substrate along the first direction, and each reset voltage line is used to transmit a reset voltage. The scan lines are arranged on the substrate along a second direction different from the first direction for transmitting a scan signal. The driving voltage lines are arranged on the substrate along the second direction for transmitting a driving voltage signal. The reset signal lines are arranged on the substrate along the second direction for transmitting a reset signal. The pixels are arranged on the substrate in an array, and each data line, each reset voltage line, each scan line and each driving voltage line surround each pixel. Each pixel includes a first transistor, a second transistor, a third transistor, a capacitor, and an organic light emitting diode. The first transistor is disposed on the substrate, and has a first end electrically connected to the corresponding data line, a second end, and a control end electrically connected to the corresponding scan line. The second transistor is disposed on the substrate, and has a first end electrically connected to the corresponding driving voltage line, a second end, and a control end electrically connected to the second end of the first transistor. The third transistor is disposed on the substrate, and has a first end electrically connected to the corresponding reset voltage line, a second end electrically connected to the second end of the second transistor, and a control terminal electrical Connected to relative The signal line should be reset. The capacitor is disposed on the substrate, and has a first end electrically connected to the second end of the first transistor and a second end electrically connected to the second end of the third transistor. The organic light emitting diode is disposed on the substrate, and has an anode electrically connected to the second end of the second transistor and electrically connected to a cathode to a low voltage power source.

To achieve the above object, the present invention provides a driving circuit for an organic light emitting display comprising a plurality of pixels and a control element. Each pixel includes a first transistor, a second transistor, a third transistor, a capacitor, and an organic light emitting diode. The first transistor has a first terminal for receiving a data voltage or a reference voltage, a second terminal, and a control terminal for receiving a scan signal. The second transistor has a first end for receiving a driving voltage signal, a second end, and a control end electrically connected to the second end of the first transistor. The third transistor has a first end for receiving a reset voltage, a second end electrically connected to the second end of the second transistor, and a control end for receiving a reset signal. The capacitor has a first end electrically connected to the second end of the first transistor, and a second end electrically connected to the second end of the third transistor and the second end of the second transistor. The organic light emitting diode has an anode electrically connected to the second end of the second transistor and electrically connected to a cathode to a low voltage power source. The control component is electrically connected to the first end of the second transistor for providing a driving voltage signal.

Each pixel of the organic light emitting display of the present invention can drive the organic light emitting diode 130 by using only three transistors and a capacitor, and compensate for the offset of the threshold voltage generated by the second transistor, thereby effectively reducing the offset. The number of transistors can reduce the area occupied by the transistors, so the aperture ratio of each pixel can be effectively improved.

Please refer to FIG. 1 . FIG. 1 is a top view of the organic light emitting display according to the first embodiment of the present invention, and FIG. 2 is an enlarged schematic view of the first embodiment in the area A. As shown in FIG. 1, the organic light emitting display 100 includes a substrate 102, such as a transparent substrate such as glass, plastic or quartz, and the substrate 102 has a display area 102a and a peripheral area 102b surrounding the display area 102a. The display area 102a is for displaying a picture, and the substrate 102 of the display area 102a has a plurality of pixel areas 102c arranged in an array, but is not limited thereto. Moreover, the peripheral area 102b is used to provide peripheral circuits and control elements, and the substrate 102 of the peripheral area 102b has a plurality of fan out regions 102d for providing a line extending from the display area 102a to the peripheral area 102b. In addition, the organic light emitting display 100 further includes a plurality of data lines 104, a plurality of reset voltage lines 106, a plurality of scan lines 108, a plurality of reset signal lines 110, a plurality of driving voltage lines 112, a plurality of pixels 114, and a plurality of The first control element 116a and the plurality of second control elements 116b. The first control element 116a is disposed on the substrate 102 of the peripheral area 102b, and is electrically connected to the corresponding data line 104 and the reset voltage line 106, and each of the first control elements 116a can be a data driving chip. For example, a driving chip integrated with a data driving circuit and a reset voltage driving circuit for respectively providing a data signal, for example, a reference voltage or a data voltage, to each data line 104, and respectively providing a reset voltage to Each of the voltage lines 106 is reset, but is not limited thereto. Each of the second control elements 116b is disposed on the substrate 102 of the peripheral region 102b, and is electrically connected to the corresponding scan line 108, the driving voltage line 112 and the reset signal line 110, and each of the second control elements 116b can be respectively Driving the wafer, for example, integrating a scan driving circuit, a driving voltage circuit, and The gate driving chip of the signal driving circuit is reset for respectively providing a scanning signal to each scanning line 108, respectively providing a driving voltage signal to each driving voltage line 112 and respectively providing a reset signal to each reset signal line 110. However, the invention is not limited thereto. Moreover, each data line is used to transmit a data signal to each pixel 114. Each reset voltage line 106 is used to transmit a reset voltage to each pixel 114. Each scan line 108 is used to transmit a scan signal to each pixel 114. Each driving voltage line is used to transmit a driving voltage signal to each pixel 114. Each reset signal line 110 transmits a reset signal to each pixel 114. The first control element and the second control element of the present invention are not limited to the above-mentioned driving wafer, and may be other control wafers. In other embodiments of the present invention, the driving voltage signals of the driving voltage lines may also be provided through other driving chips different from the gate driving chips.

In this embodiment, each data line 104 and each reset voltage line 106 are alternately arranged on the substrate 102 along a first direction 118, and extend from the display area 102a to the substrate 102 of the fan-out area 102d. It is electrically connected to the first control element 116a. Each of the scan lines 108, the driving voltage lines 112 and the reset signal lines 110 are alternately arranged on the substrate 102 along a second direction 120 different from the first direction 118, and the data lines 104 and the resets are respectively arranged. The voltage lines 106 are interleaved and extend from the display area 102a to the substrate 102 of the fan-out area 102d for electrical connection with the second control element 116b. Further, each of the pixels 114 is disposed on the substrate 102 in each of the pixel regions 102c, and is surrounded by the data lines 104, the reset voltage lines 106, the respective scan lines 108, and the respective driving voltage lines 112.

As shown in FIG. 2, each of the second control elements 116b has a plurality of pads 116c, which are divided into Corresponding to each of the scan lines 108, the driving voltage lines 112 and the reset signal lines 110 extending below the second control element 116b, and the pads 116c are respectively soldered to the respective scan lines 108 and the driving voltage lines 112. It is electrically connected to each reset signal line 110.

The pixels of this embodiment will be further described below. Please refer to FIG. 3 and FIG. 4 , FIG. 3 is a top view of each pixel area of the organic light emitting display according to the first embodiment of the present invention, and FIG. 4 is the same as the organic light emitting display according to the first embodiment of the present invention. Schematic diagram of the drive circuit of the column of pixels. As shown in FIG. 3 and FIG. 4 , each pixel 114 includes a first transistor 122 , a second transistor 124 , a third transistor 126 , a capacitor 128 , and an organic light emitting diode 130 . The first transistor 122 has a first gate 122a as a control terminal G1 and a first source 122b as a first terminal S1 and a first gate 122c as a second terminal D1 and a first semiconductor layer 122d. . The second transistor 124 has a second gate 124a as a control terminal G2 and a second source 124b as a first terminal S2 and a second gate 124c as a second terminal D2 and a second semiconductor layer 124d. . The third transistor 126 has a third gate 126a as a control terminal G3 and a third source 126b as a first terminal S3 and a third drain 126c as a second terminal D3 and a third semiconductor layer 126d. . Moreover, the capacitor 128 has two electrodes, which are respectively a first end C1 and a second end C2. Furthermore, the organic light emitting diode 130 has an anode 130a, a cathode 130b, and a light emitting layer 130c.

In each of the first transistors 122, the control terminal G1 is electrically connected to the corresponding scan line 108 for receiving the scan signal, and the first end S1 is electrically connected to the corresponding data line 104 for receiving data. a signal, and the second end D1 and the second transistor 124 The control terminal G2 and the first end C1 of the capacitor 128 are electrically connected. In each of the second transistors 124, the first end S2 is electrically connected to the corresponding driving voltage line 112 for receiving the driving voltage signal, and the second end D2 and the anode 130a of each organic light emitting diode 130, The second end C2 of the capacitor 128 and the second end D3 of the third transistor 126 are electrically connected. In the third transistor 126, the control terminal G3 is electrically connected to the reset signal line 110 for receiving the reset signal, and the first terminal S3 is electrically connected to the reset voltage line 106 for receiving the reset voltage. The cathode 130b of the organic light-emitting diode 130 is electrically connected to a low-voltage power source 132 for providing a low voltage, and the organic light-emitting diode 130 further has a parasitic capacitance 130d electrically connected to the organic light-emitting diode. Between the anode 130a of 130 and the cathode 130b.

In this embodiment, the scan line 108, the first gate 122a, the second gate 124a, the reset signal line 110, the third gate 126a, and the driving voltage line 112 are formed by a first metal layer, wherein The scan line 108 is connected to the first gate 122a, and the reset signal line 110 is connected to the third gate 126a. Also, a portion of the second gate 124a serves as an electrode of the first end C1 of the capacitor 128. In addition, the data line 104, the first source 122b, the first drain 122c, the second drain 124c, the third drain 126c, the second source 124b, the reset voltage line 106, and the third source 126b are each The second metal layer is formed. The data line 104 is connected to the first source 122b. The second drain 124c is connected to the third drain 126c, and a portion of the second drain 124c serves as the electrode of the second end C2 of the capacitor 128. The reset voltage line 106 is connected to the third source 126b. Furthermore, the first drain 122c is electrically connected to the second gate 124a through a first through hole 134, and the second drain 124b is electrically connected to the driving voltage line 112 through a second through hole 136. First semiconductor layer The 122d is disposed between the first gate 122a and the first source 122b and the first drain 122c. The second semiconductor layer 124d is disposed between the second gate 124a and the second source 124b and the second drain 124c. The third semiconductor layer 126d is disposed between the third gate 126a and the third source 126b and the third drain 126c. Further, the anode 130a, the light-emitting layer 130c, and the cathode 130b of the organic light-emitting diode 130 are sequentially stacked on the second drain 124c. It should be noted that the organic light emitting display 100 of the present embodiment does not include a high voltage power supply line, and each pixel can use only three transistors to achieve the function of driving the organic light emitting diode 130 and compensating for the offset voltage of the transistor. In turn, the uniformity of the displayed picture can be maintained.

The driving method of the driving circuit of the organic light emitting display of the present embodiment will be described in further detail below to achieve the effect of driving the organic light emitting diode using only three transistors. Further, in order to clarify the driving method of the driving circuit of each column of pixels, the same column of pixels will be described as an example. However, the present invention is not limited thereto, and the driving circuits of the different columns of pixels of the present invention can be driven in the same manner. Please refer to Figure 5 and Figure 6, and refer to Figure 4 together. 5 is a flow chart showing a driving method of a driving circuit of an organic light emitting display according to a first embodiment of the present invention, and FIG. 6 is a schematic diagram showing operation timings of a data signal, a scanning signal, a driving voltage signal, and a reset signal according to the present invention. As shown in FIG. 4 to FIG. 6 , the driving method of the driving circuit of the organic light emitting display of the present embodiment includes: Step S10: respectively providing a reference voltage Vref to the control terminal G2 electrically connected to each of the second transistors 124 The first end C1 of each capacitor 128 is charged, and the reset voltage Vreset is electrically connected to each second crystal The second end D2 of the body 124 is discharged with the second end C2 of each capacitor 128 of the anode 130a of each organic light-emitting diode 130; step S12: stopping the discharge of the second end C2 of each capacitor 128, and using the second control element 116b provides a driving voltage signal EM to the first end S2 of each of the second transistors 124 to charge the second end C2 of each capacitor 128 electrically connected to the second end D2 of each of the second transistors 124; Step S14: The first terminal C1 of each capacitor 128 is charged by the data voltage Vdata, and the driving voltage signal EM is stopped; and the first terminal C1 of each capacitor 128 is floated, and the organic light emitting diode 130 is driven.

The scan signal Sscan, the data signal Sdata, the reset signal Sreset and the driving voltage signal EM provided to the driving circuit of the OLED display 100 mainly include a reset period TD1, a threshold voltage compensation period TD2, and a data writing period TD3. And an illumination period TD4, and the reset voltage Vsus is a DC voltage.

In step S10, the driving circuit of the OLED display 100 operates in the reset period TD1, and the scanning signal Sscan and the data signal Sdata are complementary signals, that is, the scanning signal Sscan and the data signal Sdata have the same frequency, but have 180 The phase difference is such that when the scanning signal is at a logic high level, the data signal is a reference voltage, and when the scanning signal is at a logic low level, the data signal is a data voltage for displaying the picture, and the data voltage is greater than the reference. Voltage. Therefore, in the reset period TD1, when the scan signal is at a logic high level, the first transistors 122 of the same column of pixels are turned on. The reference voltage Vref of each data signal Sdata supplied to the first end S1 of each first transistor 122 is transmitted through each of the first ends S1 of the first transistors 122. A transistor 122 charges the second terminal D1 of each of the first transistors 122, that is, charges the first terminal C1 of each capacitor 128. At the same time, in the reset period TD1, the reset signal Sreset is at a logic high level, and the driving voltage signal EM is at a logic low level, so each third transistor 126 of the same column of pixels is turned on, and due to each third The first end S3 of the transistor 126 is electrically connected to each reset voltage line, so that the reset voltages Vsus supplied to the first end S3 of each of the third transistors 126 are at the second end of each of the third transistors 126. D3 discharges, that is, discharges the second terminal C2 of each capacitor 128. Therefore, in the reset period TD1, each capacitor 128 performs a reset operation on the voltages of the first terminal C1 and the second terminal C2 by using the reference voltage Vref and the reset voltage Vsus, in order to drive The data voltage Vdata of the new screen can be written correctly. At this time, the voltage of the first terminal C1 of each capacitor 128 is the reference voltage Vref, and the voltage of the second terminal C2 is the reset voltage Vsus. In addition, the cathode of each organic light emitting diode is electrically connected to a low voltage, and the reset voltage Vsus is less than the low voltage, so that the reset voltage Vsus can discharge the second end C2 of the capacitor 128 in the reset period TD1. In this embodiment, the scan signal Sscan has a plurality of logic high level periods and a plurality of logic low level periods in the reset period TD1, and the data signal Sdata has a plurality of reference voltage periods and plural numbers in the reset period TD1. The data period is not limited thereto. In other embodiments of the present invention, the scan signal may have only a single logic high level during the reset period, and the data signal has only a single reference voltage period.

In step S12, the driving circuit of the organic light emitting display 100 operates in the threshold voltage compensation period TD2. At this time, the scan signal Sscan and the data signal Sdata are the same as the reset period TD1, so the reference voltage Vref still charges the first end C1 of each capacitor 128, so that the voltage of the control terminal G2 of each second transistor 124 can be used as a reference. The voltage Vref is turned on by the respective second transistors 124 by the reference voltage Vref. At the same time, the reset signal Sreset is converted to a logic low level, so that the second end C2 of each capacitor 128 is in a floating state due to the closure of each of the third transistors 126, thereby stopping the discharge of the second terminal C2 of each capacitor 128. However, the driving voltage signal EM is converted from the logic low level to the logic high level, and since the second transistor 124 is in the on state, the voltage of the second terminal C2 of each capacitor 128 is determined by the driving voltage signal EM. And driving voltage signal EM charges second terminal C2 of each capacitor 128 electrically connected to second terminal D2 of each second transistor 124. Since the threshold voltage of the control terminal G2 and the second terminal D2 of each second transistor 124 is Vt, when the voltage of the second terminal D2 of each second transistor 124 is charged to the Vref-Vt by the driving voltage signal EM, each The second transistor 124 is turned off and the current I _OLED driving the organic light emitting diode is reduced to zero. At this time, the voltage of the second terminal D2 of each of the second transistors 124 can be determined according to the following equation: Vs=Vref-Vt; wherein: Vs is the voltage of the second terminal C2 of each second transistor 124; Vref is the reference voltage And Vt is the threshold voltage of each of the second transistors 124.

In step S14, the driving circuit of the organic light emitting display 100 operates in the data writing period TD3. At this time, the scan signal Sscan is not complementary to the data signal Sdata, and when the scan signal Sscan is at a logic high level, the data signal Sdata can be the data voltage Vdata, and each of the first transistors 122 can be turned on, so that the Each data voltage Vdata of the first end S1 of each of the first transistors 122 can charge the first end C1 of each capacitor 128, respectively. Thereby, the voltage of the control terminal G2 of each of the second transistors 124 can be the respective data voltages Vdata. Moreover, in the data writing period TD3, the reset signal Sreset is still at a logic low level, and the driving voltage signal EM is converted to a logic low level to stop providing the driving voltage signal to each of the second transistors 124. It is worth mentioning that the data voltage Vdata controls the size of the current I _OLED driving the organic light emitting diode 130 through the control terminal G2 of the second transistor 122, and the size of the current I _OLED corresponds to the gray color of the organic light emitting diode 130. Order value. Therefore, when the data signal Sdata is converted from the reference voltage Vref to the data voltage Vdata, and the second terminal C2 of the capacitor 128 is in a floating state, the voltage V _S of the second terminal D2 of the second transistor 124 can be determined according to the following equation : V _S =Vref-Vt+a(Vdata-Vref), Wherein: Vdata is the data voltage; C1 is the capacitance value of the capacitor 128; and C2 is the equivalent capacitance value of the organic light-emitting diode 130, that is, the capacitance value of the parasitic capacitance 130c.

In step S16, the driving circuit of the organic light emitting display 100 operates in the light emitting period TD4. At this time, the scan signal Sscan is converted to a logic low level, so that each of the first transistors 124 is turned off, and the first end C1 of each capacitor 128 is floated. Therefore, the voltage of the first terminal C1 of each capacitor 128 is still the data voltage Vdata, so that the second transistor 124 is still turned on. At the same time, the driving voltage signal EM is converted to a logic high level, and since the first end S2 of each second transistor 124 is electrically connected to the driving voltage line, it is supplied from the second control element 116b to each of the second transistors 124. The driving voltage signal EM of the first terminal S2 drives each of the organic light emitting diodes 130 through the respective second transistors 124. At this time, the voltage V _G of the control terminal G2 of each of the second transistors 124 and the voltage V _S of the second terminal S2 of each of the second transistors 124 can be determined according to the following equation: V _G =Vdata+Vt-Vref-a( Vdata-Vref)+OVSS+VOLED, V _S =OVSS+VOLED; wherein: V _G is the voltage of the control terminal G1 of each of the second transistors 124; OVSS is the voltage of the cathode 130b of each of the organic light-emitting diodes 130, that is, a low voltage; and the VOLED system is The cross-pressure of each of the organic light-emitting diodes 130.

Since the voltage VG of the control terminal G2 and the voltage VS of the second terminal S2 of each of the second transistors 124 are known, the voltage difference VGS between the control terminal G2 and the second terminal S2 of each second transistor 124 can be according to the following equation. Decision: V _GS =V _G -V _S =Vdata+Vt-Vref-a(Vdata-Vref)+OVSS+VOLED-OVSS-VOLED=(1-a)(Vdata-Vref)+Vt

Therefore, the current IOLED driving the organic light-emitting diode at this time can be determined according to the following equation: I _OLED = k(V _{GS -} Vt) ² = k [(1 - a) (Vdata - Vref)] ²

From this, it can be seen that the current IOLED passing through each of the organic light-emitting diodes and the threshold voltage Vt of the second transistor 124 are independent of the low voltage OVSS.

As can be seen from the above, the organic light emitting display 100 of the present embodiment can utilize the driving method described above, and can drive the organic light emitting diode 130 with three transistors and a capacitor, and compensate the threshold voltage generated by the second transistor. Offset. Therefore, each pixel of the organic light emitting display 100 of the embodiment needs only three transistors and a capacitor, and the number of transistors can be effectively reduced, and the area occupied by the transistors can be reduced, so that the aperture ratio of each pixel can be reduced. Effectively improved. Moreover, the organic light emitting display 100 of the present embodiment may not include a high voltage power supply line, and the configuration line is more effectively reduced, so that the aperture ratio of each pixel can also be improved.

The organic light emitting display of the present invention is not limited to the above embodiment. The other embodiments and variations of the present invention are described in the following, and the same reference numerals will be used to refer to the same elements, and the repeated parts will not be described again.

Please refer to FIG. 7. FIG. 7 is a top view of the organic light emitting display according to the second embodiment of the present invention. As shown in FIG. 7, the arrangement order of the scanning lines, the reset signal lines, and the driving voltage lines in this embodiment is different from that in the first embodiment. In this embodiment, the scan line 202 of the organic light emitting display 200 can be divided into an odd scan line 202a and an even scan line 202b, and each odd scan line 202a and each even scan line 202b are alternately arranged along the second direction 120. The reset signal line 204 can be divided into an odd reset signal line 204a and an even reset signal line 204b, and each of the odd reset signal lines 204a and the even reset signal lines 204b are alternately arranged along the second direction 120. The driving voltage line 206 can be divided into an odd driving voltage line 206a and an even driving voltage line 206b, and each of the odd driving voltage lines 206a and the even driving voltage lines 206b are alternately arranged along the second direction 120. The odd-numbered scan lines 202a, the odd-numbered reset signal lines 204a, the odd-numbered drive voltage lines 206a, the even-numbered drive voltage lines 206b, the even-numbered reset signal lines 204b, and the even-numbered scan lines 202b are sequentially along the second direction. 120 alternately arranged. Thereby, the structures in the pixel regions 102c of the two adjacent columns are mirror-symmetrical in the first direction 118.

In summary, each pixel of the organic light emitting display of the present invention can drive the organic light emitting diode 130 by using only three transistors and a capacitor, and compensate for the shift of the threshold voltage generated by the second transistor. Thereby, the number of transistors can be effectively reduced, and the area occupied by the transistors can be reduced, so that the aperture ratio of each pixel can be effectively improved. Moreover, the organic light emitting display of the present invention may not include a high voltage power supply line, and the configuration line is more effectively reduced, so that the aperture ratio of each pixel can also be improved.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧Organic light-emitting display

102‧‧‧Substrate

102a‧‧‧ display area

102b‧‧‧ surrounding area

102c‧‧‧Pixel area

102d‧‧‧Fanjie District

104‧‧‧Information line

106‧‧‧Reset voltage line

108‧‧‧ scan line

110‧‧‧Reset signal line

112‧‧‧Drive voltage line

114‧‧ ‧ pixels

116a‧‧‧First control element

116b‧‧‧Second control element

118‧‧‧First direction

120‧‧‧second direction

122‧‧‧First transistor

122a‧‧‧first gate

122b‧‧‧first source

122c‧‧‧First bungee

122d‧‧‧First semiconductor layer

124‧‧‧Second transistor

124a‧‧‧second gate

124b‧‧‧second source

124c‧‧‧second bungee

124d‧‧‧second semiconductor layer

126‧‧‧ Third transistor

126a‧‧‧third gate

126b‧‧‧ third source

126c‧‧‧third bungee

126d‧‧‧third semiconductor layer

128‧‧‧ Capacitance

130‧‧‧Organic Luminescent Diodes

130a‧‧‧Anode

130b‧‧‧ cathode

130c‧‧‧Lighting layer

132‧‧‧Low voltage power supply

134‧‧‧First perforation

136‧‧‧Second perforation

200‧‧‧Organic light-emitting display

202‧‧‧ scan line

202a‧‧‧odd scan lines

202b‧‧‧ even scan lines

204‧‧‧Reset signal line

204a‧‧‧odd reset signal line

204b‧‧‧ even reset signal line

206‧‧‧Drive voltage line

206a‧‧‧odd drive voltage line

206b‧‧‧ even drive voltage line

C1‧‧‧ first end

C2‧‧‧ second end

D1‧‧‧ second end

D2‧‧‧ second end

D3‧‧‧ second end

EM‧‧‧ drive voltage signal

G1‧‧‧ control terminal

G2‧‧‧ control terminal

G3‧‧‧ control terminal

S1‧‧‧ first end

S2‧‧‧ first end

S3‧‧‧ first end

Sscan‧‧‧ scan signal

Sdata‧‧‧Information Signal

Sreset‧‧‧Reset signal

Vsus‧‧‧Reset voltage

1 is a top plan view of an organic light emitting display according to a first embodiment of the present invention.

Fig. 2 is an enlarged schematic view of the first image in the area A.

FIG. 3 is a top plan view of each pixel region of the organic light emitting display according to the first embodiment of the present invention.

4 is a schematic diagram of a driving circuit of pixels in the same column of the organic light emitting display according to the first embodiment of the present invention.

Fig. 5 is a flow chart showing a driving method of a driving circuit of the organic light emitting display according to the first embodiment of the present invention.

Figure 6 is a schematic diagram showing the operation timings of the data signal, the scanning signal, the driving voltage signal and the reset signal of the present invention.

Figure 7 is a top plan view of an organic light emitting display according to a second embodiment of the present invention.

112‧‧‧Drive voltage line

114‧‧ ‧ pixels

116b‧‧‧Second control element

122‧‧‧First transistor

124‧‧‧Second transistor

126‧‧‧ Third transistor

128‧‧‧ Capacitance

130‧‧‧Organic Luminescent Diodes

130a‧‧‧Anode

130b‧‧‧ cathode

132‧‧‧Low voltage power supply

C1‧‧‧ first end

C2‧‧‧ second end

D1‧‧‧ second end

D2‧‧‧ second end

D3‧‧‧ second end

EM‧‧‧ drive voltage signal

G1‧‧‧ control terminal

G2‧‧‧ control terminal

G3‧‧‧ control terminal

S1‧‧‧ first end

S2‧‧‧ first end

S3‧‧‧ first end

Claims (15)

A method for driving a driving circuit of an organic light emitting display, the driving circuit comprising a plurality of pixels and a control component, and each of the pixels comprises a first transistor, a second transistor, a third transistor, a capacitor, and An organic light emitting diode, wherein the control element is electrically connected to the first ends of the second transistors, the method comprising: respectively providing a reference voltage pair electrically connected to the control ends of the second transistors Charging a first end of each of the capacitors, and providing a reset voltage to discharge a second end of each of the capacitors electrically connected to a second end of each of the second transistors and an anode of each of the organic light emitting diodes; Stopping the discharge of the second end of each of the capacitors, and providing a driving voltage signal to the first end of each of the second transistors by the control component to electrically connect to the second end of each of the second transistors Charging the second ends of the capacitors; respectively charging a first end of each of the capacitors with a data voltage, and stopping providing the driving voltage signals; and floating the first ends of the capacitors, and driving the first terminals Organic light emitting diodes. The method for driving a driving circuit of an organic light emitting display according to claim 1, wherein the step of respectively supplying each of the reference voltages to charge the first ends of the capacitors comprises: turning on the first transistors; The reference voltage is applied to the first ends of the first transistors to charge the first ends of the capacitors electrically connected to the second ends of the first transistors. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein the step of providing the reset voltage to discharge the second end of each of the capacitors comprises: turning on each of the third transistors; and providing the weight And applying a voltage to the first ends of the third transistors to discharge the second ends of the capacitors electrically connected to the second ends of the third transistors. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein the step of stopping the discharging of the second end of each of the capacitors comprises closing each of the third transistors. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein the step of charging the first end of each of the capacitors by using each of the data voltages comprises: turning on the first transistors; and separately providing Each of the data voltages is coupled to the first end of each of the first transistors to charge the first end of each of the capacitors electrically connected to the second ends of the first transistors. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein the step of floating the first ends of the capacitors comprises turning off the first transistors. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein the step of driving the organic light emitting diodes comprises providing the using the control element Driving a voltage signal to the first ends of the second transistors to drive the respective organic light emitting diodes through the second transistors. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein each of the data voltages is greater than each of the reference voltages. The method of driving a driving circuit of an organic light emitting display according to claim 1, wherein the cathode of the organic light emitting diode is electrically connected to a low voltage, and the reset voltage is less than the low voltage. An organic light emitting display comprises: a substrate; a plurality of data lines arranged sequentially on the substrate along a first direction, wherein each of the data lines is used for transmitting a reference voltage or a data voltage; The voltage lines are sequentially arranged on the substrate along the first direction, and each of the reset voltage lines is configured to transmit a reset voltage; the plurality of scan lines are arranged along a second direction different from the first direction On the substrate, for transmitting a scan signal; a plurality of driving voltage lines are arranged on the substrate along the second direction for transmitting a driving voltage signal; and a plurality of reset signal lines are along the second The direction is arranged on the substrate for transmitting a reset signal; and the plurality of pixels are arranged on the substrate in an array, and each of the data lines, Each of the reset voltage lines, each of the scan lines and each of the driving voltage lines surrounds each of the pixels, and each of the pixels includes: a first transistor disposed on the substrate and having a first end electrically connected Corresponding to the data line, a second end, and a control end electrically connected to the corresponding scan line; a second transistor disposed on the substrate and having a first end electrically connected to Correspondingly, the driving voltage line, a second end, and a control end are electrically connected to the second end of the first transistor; a third transistor is disposed on the substrate and has a first end Connected to the corresponding reset voltage line, a second end is electrically connected to the second end of the second transistor, and a control end is electrically connected to the corresponding reset signal line; a capacitor, The first end is electrically connected to the second end of the first transistor, and the second end is electrically connected to the second end of the third transistor; and an organic light emitting diode a body disposed on the substrate and having an anode electrically connected to the second The body second end connected to a low voltage power supply and a cathode electrically. The organic light emitting display of claim 10, wherein the organic light emitting display does not include a high voltage power line. The organic light emitting display according to claim 10, further comprising a plurality of driving crystals The chip is electrically connected to the driving voltage lines, and the driving chips supply the driving voltage signals to the driving voltage lines. The OLED display of claim 10, further comprising a plurality of gate driving chips, wherein the gate driving chips are electrically connected to the scan lines for providing the scan signals to the scan lines, and The gate driving chip is electrically connected to the reset signal lines for providing the reset signal to the reset signal lines. A driving circuit for an organic light emitting display, comprising: a plurality of pixels, each of the pixels comprising: a first transistor having a first end for receiving a data voltage or a reference voltage, a second end, and a The control terminal is configured to receive a scan signal; a second transistor has a first end for receiving a driving voltage signal, a second end, and a control end electrically connected to the second end of the first transistor a third transistor having a first end for receiving a reset voltage, a second end electrically connected to the second end of the second transistor, and a control end for receiving a reset signal; a capacitor having a first end electrically connected to the second end of the first transistor, and a second end electrically connected to the second end of the third transistor and the second transistor a second end; and an organic light emitting diode having an anode electrically connected to the second end of the second transistor and a cathode electrically connected to a low voltage power supply; A control component is electrically connected to the first ends of the second transistors for providing the driving voltage signal. The driving circuit of the organic light emitting display according to claim 14, wherein the control element is a gate driving chip.